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  1. #1
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    How much boost are you running in your 5.7?

    Bozo4 posted a thread regarding pulleys, and it got me thinking....how much boost are people running in their 5.7's. I know you'll need to go to a forged pistons if you go beyond 6psi, but it'd be nice to know what people have run with success.
    SCOTT57RT
    2007 RT Charger 5.7L - Black Crystal Pearl
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  2. #2
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    5-6lbs is about average. anymore then that you are pushing your luck. Its not an if the motor pops its when.

  3. #3
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    I ran 11psi with my old NCTS turbo kit way back when. Motor was totally stock.

  4. #4
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    8 psi and going strong.... I know of 2 guys running 10psi with top mounts going strong after nearly a year.. One of those guys has a motor waiting and has been punishing the motor he has to see what it will handle . He takes it to every Dyno day and drag day he can. Pulls 460 rwhp on its street tune and bounced it to 490 on the dyno. My car is tuned by the same tuner with a much more modest tune with reliability in mind and he is confident that my motor will wear out before it breaks.. I must add that I also run an awesome Australian product in my fuel that raises my octane to about 100ron.. Just to be certain.. It is tuned though for Aust 98ron.. Just in case I get caught without it..

    Have a look at it.. I swear by it and so do alot of racing teams..... http://www.nitrous.com.au/

  5. #5
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    What people consider a success can be misleading. You can theoretically run 15lbs of boost on your car and not have a problem do a few dyno pulls to show big numbers and then you never drive your car over 40mph for two years and 20k miles. Would you call that a success? Success to me is you can drive your car everyday hard take it to the track 20 times a year and not have to worry about a tow home. There are guys here that have sprayed 250 shot of N2o on stock blocks some have gotten 1 pass others have gone 50 passes before it popped. Would that be a success as well?

    As a vendor here I believe we have a reasonability to make sure the customers know what can be done safely and reliable.

  6. #6
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    Quote Originally Posted by modernmuscle View Post
    What people consider a success can be misleading. You can theoretically run 15lbs of boost on your car and not have a problem do a few dyno pulls to show big numbers and then you never drive your car over 40mph for two years and 20k miles. Would you call that a success? Success to me is you can drive your car everyday hard take it to the track 20 times a year and not have to worry about a tow home. There are guys here that have sprayed 250 shot of N2o on stock blocks some have gotten 1 pass others have gone 50 passes before it popped. Would that be a success as well?

    As a vendor here I believe we have a reasonability to make sure the customers know what can be done safely and reliable.

    What he said
    ProCharger P1SC1 Supercharger @ 15lbs Boost, Built 426, Modified ProCharger Tune, ProCharger Boost-A-Pump, 65lb Fuel Injectors, Kooks Coated Headers & HF Cats, Magnaflow Cat-Back, CompCam 268, BT Catch Can w/Fender Mount, 180 Degree T-Stat, CNC Ported Throttle Body, ATI Super Damper 5% Overdrive, DiabloSport Programmer.

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  7. #7
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    Running 5-6 with the vortech
    Mods:Accuair,Koni shocks,VORTECH,Slp loudmouth exhasut,Jba cat less mid pipe,Forgiatos @@'s Tucking 7in lip in the rear!!!! Shaved door handles/trunk,vented fenders,Flashtech RGB halos,black exhaust tips,jl audio,6.1 manifold painted

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  8. #8
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    Hey I am not saying that I don't believe that I or anyone wanting to run a decent amount of boost in these motors shouldn't have a motor built. I have built and helped build enough cars to know what can happen. I am just telling you what my first hand experience is. I or my wife drive my car daily. I give it some whenever it is called apon. But I Also know how to drive 2. That's gotta account for something. Build me the toughest motor you can and I am sure I can find someone to blow it up with bad driving.

    I built a fully forged m3 motor strapped a massive kkk turbo on with an external gate and haltec management. Ran 450rwhp in a 2 door hatch. Wicked car. Had it for quit some time. Sold it to s young lad that smashed the gearbox first and then blew the motor before being t boned. Makes me cry just thinking of it.

    That said... I will be building a motor for more power and piece of mind....

  9. #9
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    Quote Originally Posted by bozo4 View Post
    8 psi and going strong.... I know of 2 guys running 10psi with top mounts going strong after nearly a year.. One of those guys has a motor waiting and has been punishing the motor he has to see what it will handle . He takes it to every Dyno day and drag day he can. Pulls 460 rwhp on its street tune and bounced it to 490 on the dyno. My car is tuned by the same tuner with a much more modest tune with reliability in mind and he is confident that my motor will wear out before it breaks.. I must add that I also run an awesome Australian product in my fuel that raises my octane to about 100ron.. Just to be certain.. It is tuned though for Aust 98ron.. Just in case I get caught without it..

    Have a look at it.. I swear by it and so do alot of racing teams..... http://www.nitrous.com.au/
    Is the octane boost the thing that is allowing you to push more sc boost?

  10. #10
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    Quote Originally Posted by SCOTT57RT View Post
    Is the octane boost the thing that is allowing you to push more sc boost?
    It's going to allow you to run more timing but it's the physical ability of the motor to handle the boost that will be the factor.

    More boost = higher intake temps that will have to be controlled as well.

    The 5.7 isn't a platform known for its ability to handle gobs of extra power. Just be ready to put a forged motor back in if you play with higher boost levels.
    Just lurking. Hemi Registry #1050

  11. #11
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    What is the main driver for forged parts with higher boost? Do the stock parts not handle the higher forces and torques...or is it the higher combustion temps that degrade the strength of the parts??

    I've seen some variation on the required forged parts. Are the pistons the only things you need to change out?

  12. #12
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    11PSI for about 1100 miles. Those were really hard miles.then pop.
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  13. #13
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    Quote Originally Posted by SCOTT57RT View Post
    What is the main driver for forged parts with higher boost? Do the stock parts not handle the higher forces and torques...or is it the higher combustion temps that degrade the strength of the parts??

    I've seen some variation on the required forged parts. Are the pistons the only things you need to change out?
    You can probably get away with forged pistons,but aslong as your in the motor changing pistons,ya might as well do everything else. Rods,crank,ect.


    Last edited by J-Z; 05-24-2011 at 08:46 AM.

  14. #14
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    Quote Originally Posted by SCOTT57RT View Post
    What is the main driver for forged parts with higher boost? Do the stock parts not handle the higher forces and torques...or is it the higher combustion temps that degrade the strength of the parts??

    I've seen some variation on the required forged parts. Are the pistons the only things you need to change out?
    Forged parts are simply made to handle higher power levels. The 6.1 replacement pistons are a great budget option but there is always a power max power level with any collection of parts.

    If you want more power your going to have to pay. By the time you need to build a forged motor your going to be into upgrading your transmission and upgrading your rearend as well.

  15. #15
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    Quote Originally Posted by Coopers_Dad View Post
    Forged parts are simply made to handle higher power levels. The 6.1 replacement pistons are a great budget option but there is always a power max power level with any collection of parts.

    If you want more power your going to have to pay. By the time you need to build a forged motor your going to be into upgrading your transmission and upgrading your rearend as well.
    It seems like the discussion of forged parts only comes up with higher boost levels. Does higher boost create higher combustion temps or something that makes it harder on the engine? For example, would I need forged parts if I got a cam as opposed to cranking up my boost?? They both would add power. If it was a temperature thing, I could understand it because the material strength would degrade significantly with temperature.

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