SRT Chat Session

Discussion in 'Challenger News, Articles and Media Reviews' started by SRT-Tom, Dec 28, 2013.

  1. SRT-Tom

    SRT-Tom Well-Known Member Staff Member Super Moderator Article Writer

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    The SRT engineers finally held a chat session. It occurred on October 29, 2013 on the LX Forum. Some good stuff, including their telephone number!

    Here are the Q & A (1 0f 2)

    Have you folks ever worked on a vehicle that was destined to be part of the SRT line and it never made it? Or have you envisioned other existing Chrysler vehicles begin SRT's, but they just didn't meet performance / business case?

    We consistently looking at possible avenues to stay competitive.

    Is it possible to install the Gen I LX Brembo brakes from an SRT on to a Gen II LX? I've heard conflicting answers, and would love clarification.

    Gen I LX SRT Brembo brakes will not fit on the Gen II LX (base) - you would need the SRT knuckle to accept the Brembo brakes.

    Im not sure if you have heard but a Dodge Challenger twin turbo 3rd gen Hemi just went 7.85sec in 1/4!!

    I was wondering if you have any ideas to keep from lifting heads at 25 psi of boost and above?? Ls engines dont have a problem but we do.Some are working on it with head studs and O ring the block and heads and special gaskets.Any other places we should look at??

    You're covering the right items: I would look at a high quality set of head studs. The unit loading will be high and you don't want to get into yield with the bolts. Watch the tensile / yield properties. I would go with the best material available for your application to keep the studs in the tensile range. You should use a good multi layer steel head gasket. The stock gasket is MLS and works well; however, your unique package may require aftermarket MLS gaskets. Especially if you need to adjust the compressed thickness to get a specified compression ratio. They are out there for boosted HEMI engines. O-rings are good as well but are harder to adapt. Good luck with your package!


    Have you guys ever considered sponsoring sportsman/x275 drag racers with parts discounts, awards, free t-shirts or some other form of support? There are a few of us putting ridiculous money into our SRTs/drag paks and those cars are getting good press for Dodge/Chrysler in the process. It would be nice if you guys could find some way to assist/support/recognize/encourage us

    Thank you for your support of SRT/Chrysler products. We will look into your suggestion! We hope you have great success going forward with your races!

    I've owned my 2009 Challenger SRT for 4 years and have put 25,000 miles on it. And it still puts a smile on my face every single time I drive it! Thank you for building a great looking, great performing, and comfortable car!

    Glad to hear you're enjoying your car, thanks for the feedback. We know the feeling and share your passion!

    On the Magnum, is the dynamic sense module actually positioned at the center of gravity (X / Y / Z) for this platform?

    The g sensor is positioned as close as possible to the centerline (Y) of the vehicle but due to packaging constraints it is not possible to position it exactly at the CG coordinates.

    Besides being an overall better car (and being more livable). What were your goals in upgrading from the previous Viper to the current one? Do you feel there's a lot left in the V10 for future factory upgrades?

    We wanted to evolve the vehicle to the next level but stay true to the spirit of the Viper as a race car at its core.

    There are many of us still looking for the ability to reprogram the TCM . For example, running a high stall converter (flashing to 5500rpm), The TCM logic thinks the car is spinning the tires on launch and force shifts the car into 2nd before it ever moves and then the converter will not lock up. Short of a stand alone controller, there is not much else to do other than keep the flash on the converter to under 4400 rpm. The Mopar TCM is a good start and for mildy modified vehicles is a solution. But for highly modified vehicles, it just does not go far enough. Any help in this area is appreciated.

    We don't have anyone here from Mopar tonight.
    ________________________________________

    I love my 06 300c srt8 66000 miles just cant stand all the clunking that goes on in the front end.

    I would start by replacing your upper shock mounts (with the 2011 or newer SRT shock mounts P/N 05181575AA); while your suspension is apart I would look at your lower control arm bushings and stabilizer bar bushing for signs of wear.

    Will the MOPAR TCM P5155177 listed for SRTs up to 2010 function on an 11 Challenger SRT? If not will
    there be one made available?

    Engine changed from 6.1L to 6.4L between these years. The ECM sends a signal to the TCM to instruct it which calibration to use, and that changed with the engine change. The Mopar TCM good thru 10MY likely won't support the new signal from the 11MY ECM.

    Question about ZD-2013 Viper SRT Off-Road PCM. A MoPar accessory. Have had em for Gen 2-3-4...but have yet to see one for Gen V. Any idea of release date? SEMA in 2 weeks ? 'See you at SRT Viper Cup - Sebring Nov 22-24'

    Sorry, we can't talk about future plans.

    2006 MSRT8. Does my brake system compensate for knock back by bringing the pads back to the rotors after an aggressive corner?

    No, knock back didn't coming in until 2009.

    SRT392 intake, pushrods, valves and springs fit the 5.7 HEMI? Will Challenger SRT392 suspension fit a Charger LD?

    Some 6.4L engine components will swap with a comparable 5.7L. Valve covers, rocker shaft assemblies and pushrods will swap. Valves and springs are specific to each application as well as the valve seats and machining. The intake flange and bolt holes will allow a 6.4L intake on a 5.7L but your port openings are different. The 6.4L SRV valve in the intake will need a proper calibration as well.

    It depends on what you are trying to do. Steady state high rpm packages can tolerate bigger ports and larger intake plenums that wouldn't work as well during transients of daily driving. The stock 6.1L head is a good piece and a lot of those features were carried over into the 6.4L head. Since you use your car for both street and strip you should watch your balance of port size / cam profile / plenum volume versus driveability. Mopar has ported 6.1L heads that will pick up air flow without killing driveability. Regarding displacement, the simple answer is more displacement needs more airflow.

    For first gen SRT front ends, is there an indentically spec'd Mercedes/ AMG part that if found, would work and perhaps provide better longevity?

    The L platform vehicles have been greatly modified and there are no bolt-ons that we aware of. We would be interested to know what components are you looking to get better longetivity out of?

    Recently had both front knuckles and upper control arms ( redesigned) replaced on my 2007 SuperBee, What was the reason for the design change ?? Also I just recently installed the Mopar performance torque converter and states it stalls @ 2500 for a 5.7. Just curious what it stalls in my 6.1 ?

    The change to front caster was to improve the on center returnablity of the steering system. Sorry we don't have anyone here from Mopar performance here tonight.

    Does the rear spoiler on my 08 Charger SRT-8 do anything besides block my view? Why isn't a spoiler delete option available?

    It ABSOLUTELY works. The front and rear aero have been tuned to have the car feel the same at 150 mph as 80 mph. The rear end has 77 counts of downforce (with that spoiler and will have some serious lift without it). Dynamics wouldn't sign off on the high speed stability without it.

    With your response in mind, how does the Magnum SRT differ? Specifically, without the spoiler what is the downforce on our cars? I assume it also passed "speed stability", does the front rear balance (closer to 50/50) compensate perhaps? If you have the time, a related question for someone that wants to seriously road track the Magnum. Without knowing the actual weight difference (I'll try to find and edit this asap) I'm looking at replacing the rear gate with a carbon fibre one. This is obviously a big chunk of metal, do you anticipate a positive impact due to weight loss, or a negative one due to weight bias alteration? EDIT - the weight savings is 50lbs, alone, not likely enough to consider. Any idea what the tipping point (literally LOL) might be? So to be clear, how many pounds of weight loss at ONE end, would have a negatively affect the handling the benefits from 49/51 bias?
     
  2. SRT-Tom

    SRT-Tom Well-Known Member Staff Member Super Moderator Article Writer

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    Q & A (2 0f 2):

    I'll try posting this again....on the aero side, the Magnum actually is very close to neutral aero balance. It is does indeed pass the SRT high speed stability test. If it didn't we would have sold it like that.

    Will SRT392 intake, pushrods, valves and springs fit the 5.7 HEMI? Will Challenger SRT392 suspension fit a Charger LD?

    SRT392 suspension parts components were specifically tuned for Challenger vehicle parameters (weight, wheelbase, etc.). However, the componets will bolt onto the Charger. Note: make sure you use the Challenger SRT Core suspension components, not the ones from the active suspension.

    What vehicles do you guys use as Daily Drivers? What other vehicles are in your stable?

    98 beater neon with ACR suspension and 65 Plymouth that goes low 10's. Of the 17 people in the room, we have a handful of SRT4's, couple SRT8's and a 2013 Viper.

    My thoughts were that perhaps the AMG equivalents to tension struts, tie rod ends and maybe the swaybar bushing equivalents might outlast that which is offered by the factory. Also, I was under the impression that the AMG components might be fabricated from aluminum.

    We cannot comment on other manufacturers' products or components.

    What at about the second question? Will Challenger or Charger SRt392 suspension fit a second
    generation Charger R/T?

    Yes it will bolt on, but the suspension tuning will not be balanced well front to rear if you only do the rear. it would be closer if you go charger to charger than challenger to charger.

    I've wanted a Viper since I was 10 years old. I make it a point to see a Viper every time I visit the U.S.,
    which lately has been often. I've visited Woodhouse, Roanoke and Tomball too. I have a question about the headlights on the SRT Viper. Is it a design reason or legal reason why the daytime running lights are
    the bottom eye lid and not the top? If it was the top 'eye lid' the Viper would look angry rather than having a bruised eye whilst driving around.

    The accent lights were designed as part of the styling direction of the vehicle.

    Of all the SRT models produced, is there a team favourite, either because of the challenges faced or because the final product exceeded expectations from drawing board to road test?

    They're like our kids. We love them all for different reasons, but you can't have a favorite!
    How much is the truck specific 6.4 HEMI is different for the SRT392 HEMI?
    With 5.7HEMI making 390HP/400lb.ft in its most powerful form, how The truck specific 6.4HEMI is more
    significant when it is only making 410hp/425lb.ft?

    The 6.4L truck engine was designed specifically for that application with low end torque and towing in mind. The 6.4L SRT is set up more for mid range torque and high rpm horsepower. The cam events, valves, springs, ports, intake manifold... are different.

    Since each of the SRT models has its own aerodynamic characteristics, what would be the positive or negative attritbutes of adding an aftermarket rear diffuser to a 1st gen 300 SRT?

    If the rear diffuser is designed correctly you will increase the rear downforce which will add high speed stability to the car. By putting an aftermarket part on the car without CFD or wind tunnel testing to develop the part we really can't say how the car will respond.

    Are you guys familiar with the words "Hell Cat" ?

    It's a great old airplane from WWII and a decent motorcycle.

    Do you have a direct contact for SRT owners for related questions?

    855-SRT-Team

    As average vehicles become faster and faster, and our performance vehicles reach the HP ratings of super cars from only a few years ago, one would assume the horse power war must be nearing its peak.
    What do you anticipate the next challenge or driving force in design to be?

    As a company and as an industry, we have to meet fuel economy targets to sell cars. Our big challenge is to provide outstanding performance, while simultaneously improving fuel economy.

    It's been a while since SRT has had a product on a brand new platform, and given Chrysler's new
    parents, how much of this presumably newly accessible technology, materials, and suppliers are making
    the inner engineers in all of you squeal with delight? To rephrase, how excited are you guys for SRT's super secret, can't-talk-about future? And how close to the edge of our seat should we, as car enthusiasts, be?

    We're so excited we're speechless.

    With Mopar offering a T/A style hood and a Go-Wing spoiler for Challenger R/T, would the hood fit the SRT version and how would both the hood and wing effect the high speed?

    From a fit perspective the wing will obviously fit, but not sure on the hood since the underhood packaging of the SRT is different than the Dodge. As for high speed both of these changes will probably slow the car down. Front scoops and wings usually add aero drag.

    I have issues with a gas cap. Gas cap was tested, did a smoke test on a vehicle, checked the cannisters under the rear seat and still have an error, is there anything I am overlooking to get rid of the GAS CAP code on the EVIC? Is there anything I am overlooking without replacing the gas tank? Is there a TSB or a recall on any of this? I have an '06 300C SRT8, thanks!

    You should have someone go through the entire evaporative system to check for any leaks or misrouted lines.

    How can I turn the radio off on the Uconnect2 since every time I start my Ram the radio comes on?
    The radio has become so integrated for HVAC controls, heated wheel, heated seats, etc... that it really needs to come on at key-up. You can change the intensity to a lower setting and have the radio (volume) off to minimize the impact of it being on.

    Are you going to be adding radio/nav updates in the future? I ask because there hasn't even been a
    Gracenotes update put out for the new systems. These are complex computer based system that should be periodic updates/enhancements just like any other consumer device. You wouldn't buy a phone or computer and never get updates for it. Harmon Becker did a great job of sending out updates for the Mygig based units. Unfortunately, the same can't be said for Panasonic.

    The radios are supposed to be receiving regular updates (with purchase after the first year). We're not aware of any delays but will check with our audio group. Unfortunately won't be able to get you an answer tonight.

    How competitive do you guys feel you will be in the 2014 Tudor sportscar championships? Any chance of seeing an Stealth SRT6 or SRT6? Something small, agile and fast with some real power.

    We are looking forward to the 2014 TUDOR Sportscar Championships. We are proud of what we accomplished this season, coming together as a team so quickly and we learned a lot about the race car. We will be coming out swinging.
     
  3. SRT-Tom

    SRT-Tom Well-Known Member Staff Member Super Moderator Article Writer

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    Here are the Q & A from the April 15, 2014 SRT Engineers Chat Session that was held on CherokeeSRT8.com.


    Originally Posted by VRYALT3R3D
    Questions for the SRT Viper:

    1. When will the MOPAR PCM for the 2013+ Viper be released? I am hopefully looking for an answer better then "soon."

    2. When will the MOPAR parts shown at SEMA 2 years ago be released?

    Thanks

    We don't have any of our Mopar friends here tonight, but feel free to ask them during their Twitter chats on Mondays - use #moparchat or @officialmopar.



    Originally Posted by El Rey
    Questions for Challenger SRT:

    1) Challenger is around 400lbs over it's segment weight. Any plans to shave some weight to make it more nimble?

    2) the challenger is 7-8inches longer than it's segment competitors. Any plans to make it more compact and lower in height?

    3) can you put the emergency brake as a hand brake please!!!? Foot brake is very unnatural.

    4) heads up display (hud)?

    5) sportier seats (recaros, etc)?

    6) please work on the bluetooth. I have to wait 3 seconds/mississippis to talk to someone after i answer a call.

    7) double clutch for automatic transmission? Can the shifter look more like the push-kind M and AMG vehicles have instead of like a toyota corolla?



    Hopefully some of these have already been addressed in the upcoming release '15.

    Thank you for your time!!

    Thanks for your suggestions! We can't answer some of them due to future product.
     
    Last edited: Apr 18, 2014
  4. SRT-Tom

    SRT-Tom Well-Known Member Staff Member Super Moderator Article Writer

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    Originally Posted by Nate@DemonPerformance
    1) I understand you cannot discuss precise power numbers of the upcoming Challenger line-up as they haven't been officially released but can you confidently say they will have been "worth the wait?" Compared to it's competition of course. Will it measure up?

    2) What ended up killing the idea of a 6 speed Charger?

    Thanks for taking the time to swing buy! We all appreciate your time.


    1) We are very excited for the upcoming year.
    2) The idea will never die.

    Thanks for having us

    Originally Posted by Brooksie
    I would like to request genuine MOPAR SRT performance upgrades that can be supported by the dealer. Please. ie CAI , EXHAUST, HEADERS, SUPERCHARGERS ETC

    Our Mopar friends are not here tonight, but feel free to ask our Mopar friends during their Twitter chats on Mondays - use #moparmonday or @officialmopar.

    Originally Posted by DCRSRT
    Can the SRT engineers (and Ralph of course) come to Australia and do a driveday for us Jeep SRT owners?

    Can we also have a remote start kit available to retrofit to our models?

    Love what you guys are doing with the Jeep SRT, looking forward to the new model in 2016/17?


    If you can talk our bosses into sending us over there, we're IN!

    Ask our Mopar friends about remote start - Mondays on Twitter. Use #moparmonday or @officialmopar


    Originally Posted by sealrockswell
    Recently I have experienced some rolling power failure issues. I have taken it in for service multiple times to two different dealerships. Neither of which were able to determine the cause of the problem, as there are "no relevant codes". I have asked many different SRT owners and to my surprise this is somewhat of a common problem. Not only is the vehicle powering down while I'm drivingit but I cannot even deploy the hazards to alert other drivers that my vehicle is disabled, in the middle of the road.

    That said, my question is this:

    What do you do when you have a life threatening issue with your Jeep SRT and you're close to exhausting any hope of resolving and or correcting the issue? Who do you turn to when the dealershipgives up?

    I love my 2007 Jeep Grand Cherokee SRT and I am very much a brand embassador, but these days this issue has taken all the fun out of driving it because I'm afraid it will power down at any moment. Please help steer me in the right directionhere. I'm fully covered with a top of the line Mopar extended warrantee and would love to enjoy driving my SRT again.

    Based on the modifications you have listed, it is very difficult for us to diagnose your vehicle.
    Originally Posted by schmojoeee
    i own a dodge caliber srt4. friend convinced me to put a blow off plate on instead of spending a larger amount of money on a BOV. i would like to remove the plate and put it back to factory. can you post pictures or tell me what was removed from my carto install the plate? it was a cheap one like found on ebay (http://www.ebay.com/itm/SRT-4-SRT4-N...d4c0db&vxp=mtr). eventually, i plan on purchasing a legit BOV. the gasket that comes with the plate aren't holding up, and the car whines as soon as you give it gas, and it blows when letting off the gas. any help would be appreciated. it's hard to find info on these srt4's.

    thanks

    The Mopar BOV comes with detailed instructions and pictures of the installation process. Just be careful not to install it backwards, it has happened to us and the symptoms are similar to what you described.

    Originally Posted by Plumcrazy4srt-99-
    THANKS SRT FOR ALL YOU HAVE DONE AND THE FUTURE!!
    1. This question is for challenger ... Did dodge address the broken rockers that we experience?
    2. Will there be a diet soon for srt vehicles ?
    3. COULD YOU PlEASE TAKE RESUME SPEED (R.S) OUT FOR A DRINK AND DINNER AND THANK HIM AS HE IS A BIG REASON WE ARE GLUED TO THESE SITES AND OF COURSE MOPAR FOR INFO .
    4. HAS THE TIMING CHAIN ISSUES BEEN RESOLVED FINALLY?
    5. THANKS FROM ALL OF US !!

    If Resume Speed is buying the drinks, we would love to meet him!

    Originally Posted by 5000XD
    Can the SRT pages still be activated when a US spec vehiclehas left the US of A and Uconnect was never subscribed to?

    Only if in Canada.

    U.S.-market 2014 Grand Cherokee SRT and 2013+ Viper vehiclesneed be in the United States or Canada for a DRM sync to occur via the embedded Uconnect Access 3G cellular service.

    Uconnect Access's embedded cellular module works within the contiguous United States, plus Alaska, and can roam in Canada.

    Originally Posted by PSU SRT
    Thanks for being here guys!

    Q: Can a 29" diameter tire be run on the WK2 SRT without any issues?

    A reduction of 1.5" is significant and will have implications on your odometer and speedometer readings (high). You need to watch for the load bearing capacity of the tire and realize that the sidewall stiffness will not be the same if the smaller tire is not a run-flat.


    Originally Posted by Knuckles
    Hello guys!!

    Thanks again for being here tonight as we all appreciate it!!

    1. How much longer will the 6.1 HEMI Engine be produced?

    We expect it to be available through Mopar through at least 2020 because it is a replacment part for production vehicles.


    Originally Posted by kmitch80
    I just wanna know, who has the fastest vehicle of all the engineers?! and what is it!?

    Congratulations, you have evoked an extremely large debate...

    More to come.


    Originally Posted by PSU SRT
    Thanks...

    Erroneous odometer and speedometer aside, the transfer case and traction/stability control should not be damaged or freak out?

    As long as you don't mismatch front and rear diameter both systems will be fine.

    Originally Posted by TerrorEyes
    Driving a 2014 GC SRT and just love it. Wonder why us Canadians don't get the SRT Track Experience? Also with Uconnect...seems we lack some features that our American cousins enjoy...


    The charge for the Track Experience is not included in Canadian vehicles, but you are more than welcome to attend an event in the States for that fee. Check out drivesrt.com for more info!

    Originally Posted by PSU SRT
    Thank you!

    PS - I make Mustang owners cry, should I care?


    It's never nice to make girls cry, but make us proud!

    Originally Posted by Whiskey Tango Foxtrot!
    In reference to a 2012 standard trans Challenger SRT8...

    I'm looking at a few options to lower my Challenger and both sides of the fence (coil overs and springs) are very limited given the capability factor with ADS. I'm leaning towards BC Racing coil overs - will I encounter any problems/codes if I disconnect the Bilstein shocks on all four corners?

    If you disconnect that shocks, you will set a "Service Suspension" code on the dashboard.

    Originally Posted by kmitch80
    I just wanna know, who has the fastest vehicleof all the engineers?! and what is it!?

    Depends on the venue:

    The boss, Ruedisueli, is the fastest around a road course racetrack in his Formula Ford.
    Wilder has the fastest drag carwith his nostalgia class early '60s Plymouth that runs low 10s.
    Diniz has the fastest street bike, his Vmax.
    Heuschele has the fastest and only iceracer, Neon.
    Stepinski and Heuschele have the fastest and only train racing figure 8 team (Neons chained together, front car has engine, rear car has brakes)
    Gilles has the fastest street/track day Viper. He is making 600 hp at the wheels of his '13.
    **** Myers winged sprint car is a living legend on paved ovals. Look it up.
     
    Last edited: Apr 18, 2014
  5. SRT-Tom

    SRT-Tom Well-Known Member Staff Member Super Moderator Article Writer

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    Originally Posted by 5000XD
    Thanks for your reply. So being outside the USA, Alaska and Canada there is zero possibility to get it activated? Might there a way to activate through the USB drivesome way?

    Visit https://rsur.extra.chrysler.com/rsur/Uconnect.do and enter the last 8 digits of your VIN into the field. This page will tell you if you vehicleis eligible for new software; if you download the latest you should be able to get SRT Performance Pages without needing the DRM sync process.

    Happy downloading!

    Quote:
    Originally Posted by DemonPerformance
    Off beat question here for you guys, the '14 3/4 ton RAM will be 6.4 powered correct?

    Thanks for stepping in here SRT!

    We don't have any of our brothers/sisters from RAM in the room, but http://www.ramtrucks.com/hostc/bmo/C...2TH/options.do


    Originally Posted by jmac29
    Why cannot we not buy the export flares for a WK1 here in the US?

    They are only made in response to goverment regualtions in specific nations. Forigen export parts are not available in the US. Personaly everyone in this group think they are ugly and would not want them on our carseven if we could get them.

    Originally Posted by SRT Engineers
    Depends on the venue:

    The boss, Ruedisueli, is the fastest around a road course racetrack in his Formula Ford.
    Wilder has the fastest drag carwith his nostalgia class early '60s Plymouth that runs low 10s.
    Diniz has the fastest street bike, his Vmax.
    Heuschele has the fastest and only iceracer, Neon.
    Stepinski and Heuschele have the fastest and only train racing figure 8 team (Neons chained together, front car has engine, rear car has brakes)
    Gilles has the fastest street/track day Viper. He is making 600 hp at the wheels of his '13.
    **** Myers winged sprint car is a living legend on paved ovals. Look it up.

    We missed Mejeur, he has the fastest helicopter. Not sure if that qualifies as a vehicle though.

    Originally Posted by Knuckles
    Quick question about TPMS SENSORS FOR THE 2006 to 2010 model jeep SRT 8's.

    1. As long as you have the correct part number do the sensors auto learn and program them selves or does it have to be done at the dealer?

    I ask because everyone I talk to says they don't need to be programmed and the dealer tells me they do need to be programmed by a service tech at the dealer.

    Thanks!!!

    The sensors will activate and auto learn their position within the first couple of miles of being installed on the vehicle.

    Originally Posted by PSU SRT
    Hypothetically - if you were to design the SRT Wrangler of your dreams, what are the top 5 design/performance goals you would shoot for?

    First off, it would have to carry the front tires (wheelie) for the full quarter mile.

    It would also have to jump five feet vertically in 4 LO with only half throttle.

    Be able to cross a lake at full throttle (like those crazy snowmobilers in Scandinavia), while simultaneously throwing 60 foot rooster tails.

    And finally, the exhaust note would scare mothers and children at a half mile distance.

    Oh, and it needs to shoot flames!


    Originally Posted by jim383
    Does it hurt anything to run unleaded race gas like vp109 (105 octane with 6.3% oxygen). I run it in a 50/50 mix with 91 octane and the stock tune seems to really like it. The mix = 98 octane with 4.05% oxygen.

    The octane won't hurt anything. The extra oxygen is leaning you out a bit. I would monitor things with a wide range O2 sensor to make sure you don't lean out too far. If you have the cats on, you can definitely overtemp and damage them, which puts a limit on how lean we can run OE.

    Originally Posted by franc
    I have a 2010 300csrt8, I have sts twin turbos and upgraded the drive shaft/1/2 shafts to 1000 hp I am experiencing a very annoying "getrag differential whine" it is loudest at 90 km/hr and seems to get better at 120km/hr. I have 80 000km. I have changed the diff oil twice and not a lot of fillings on the drain plug. Any suggestions besides don't drive 90km/hr. lol. I know you boys are not fond of forced induction but the 6.1 is a very tough engine I am running 8 lbs. boost and have 20 000 km on the kit without a complaint from the engine (still stock). Nice job on that design. The whine only started when I replaced the stock drive shaft

    Thanks Brian

    It sounds like you are making much more torque than the differential was designed for. This can result in deflecting the case and losing gear pattern, which makes the diff noisy.
     
    Last edited: Apr 18, 2014