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Thread: supercoupe abuse level?

  1. #1
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    supercoupe abuse level?

    how much abuse can these motors take? i dont want to have to worry about something randomly breaking. an mp2 with stock headers, 2.5" exhuast and un-ported heads makes what around 16psi with a 10% o/d? are these motors very reliable or is there some precautions i should know about?

  2. #2
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    In case you missed this thread...

    http://www.sccoa.com/forums/showthread.php?t=104015
    Last edited by KMT; 12-06-2008 at 11:03 PM.

  3. #3
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    You have changed you mind so many times.....

    http://www.sccoa.com/forums/search.php try this, I know I posted that in a few of you other threads

  4. #4
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    Quote Originally Posted by Nate_V6 View Post
    how much abuse can these motors take? i dont want to have to worry about something randomly breaking. an mp2 with stock headers, 2.5" exhuast and un-ported heads makes what around 16psi with a 10% o/d? are these motors very reliable or is there some precautions i should know about?
    I had ALL the MP2 stuff w/42# injectors SCP complete exhaust,76mm Pro-M mafs, BHJ hb, underdrives, and 10% od on the SC,Snow meth kit, on a stock lower end engine. I raced it some at the track ,but, not alot. I didn't drive it easy on the street though and had no issues with engine reliability. I did blow the headgaskets at a 100k ,but, replaced them with stock 4.2L mls gaskets from NAPA and put about 35k more on until the trans started slipping. In my opinion the motors are very strong and with properly tuned setups they hold up as good as anything I've seen.
    In my experience, the precautions I'd take are getting a BHJ hb and MLS headgaskets.Doing it over again those would be my main focus because it will be a problem if you own the car long enough. Get rid of the stock resonator also. I don't know if it really contributes to headgasket failure ,but, the theory makes sense and it seemed like a noticable performance enhancement to go to a better flowing resonator.
    Last edited by superbirdx; 12-10-2008 at 08:04 AM.

  5. #5
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    Sweet, lets see how many threads one person can make about the same thing

  6. #6
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    lol. thanks though foryour input superbirdx

  7. #7
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    Home of the Whopper
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    In 1998 I had about 250 RWHP and 75K miles.
    By 2004 I had about 285 RWHP and 120K miles.
    Since 2006 I've had 380 RWHP and now about 140K miles.

    Still pluggin along on stock short block.

  8. #8
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    380rwhp is a nice number. thanks for the input, certainly not worried about something going wrong

  9. #9
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    Quote Originally Posted by Nate_V6 View Post
    380rwhp is a nice number. thanks for the input, certainly not worried about something going wrong
    Stuff always goes wrong...the higher the HP the greater the chances.

    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat...............707HP/650TQ

    My Garage

  10. #10
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    true but its not like a cavalier with 380fwhp lol now then id be worried!

  11. #11
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    Sounds like somebody owned a cavalier

  12. #12
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    Quote Originally Posted by Jamez View Post
    Sounds like somebody owned a cavalier
    yea thats too bad...

    i rebuilt mine to stock specs and made close to 400 rwhp and 500 ftlbs of tq...crank is the same rods are same and pistons are hyperutechtic (sp)...but thats not to say it wont fall apart tomorrow.

    with your set-up you should be fine unless you blow a headgasket but thats all you should have to worry about for now...

    also the car should be properly tuned with any mods as well

  13. #13
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    have you changed you mind yet?

  14. #14
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    ha yea this car isnt cheap in general....once you have replaced all the things that go wrong with this car its good to go, but the list almost seems to never end once you start trying to make power. especially now with the cars being older and having alot more miles on them...which is the case with most cars.

  15. #15
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    hmmm never owned a cavaliar, but I know people who have had them, that have had enough problems stock lol so I'm asuming they would be worse with more power. and what do you mean have I changed my mind yet? my plans change as I learn things. is that what your reffering to?

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