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Help needed

This is a discussion on Help needed within the Corvette forums, part of the Vehicle Specific category; okay i have a 99 corvette with a 408 cui with 11.5 to 1 compression. the car was originally set ...

  1. #1
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    torch red
    99 c5

    Help needed

    okay i have a 99 corvette with a 408 cui with 11.5 to 1 compression. the car was originally set up for nitrous. but now i'm having doubts.. i wanna go turbo or supercharged. can it be done with 11.5 compression???? i'm making 440 rwhp

  2. #2
    Senior Member bills98ta's Avatar
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    1998 Trans Am

    I will be over 13-1 with NOS... Most people will say that's to high of compression for boost, but I say keep the boost level a little lower !!! I'd start out no more than 4-6 lbs' of boost... ( my opinion )

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    someday joejenkinsglass's Avatar
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    its all in the tune

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    torch red
    99 c5

    so it can be done? just run low boost and make sure the tune is on? even though the car has a nitrous cam? what kind of power do you think i cam make?

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    Senior Member Z06-Goose's Avatar
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    2007 Audi RS4

    At 11:5CR yiou'll be asking for trouble. You'll be limited to the amount of boost, which will be low I assume, to be worth the hassle
    For a 408cid you should be over the 500rwhp range N/A. Why only 440hp?
    2007 Audi RS 4

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    Just me Y2KPewterSS's Avatar
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    Boost + 11.5 compression =
    CCW SP 500s 18x10 275/35 18x11 295/35
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    Quote Originally Posted by konigandy6 View Post
    I'd rather be bi than full homo!!!!

  7. #7
    someday joejenkinsglass's Avatar
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    I cant remember what magazine did it but one built a 408 with fairly high compression and @15 lbs of boost from a t98 it required race gas but made over 1200hp the article was done 2-4 yrs ago I think

  8. #8
    Impounded
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    Atlantic Blue
    2005 Legacy GT Stage 2

    There was a guy around here running a T88 with 10.5 to 1 comp ratio running 15psi and 20psi spraying meth. I talked to him he was making 800rwhp but he said the whole setup is a headache. Which i would believe, i have enough headaches with my 8.7 to 1 comp ratio supra and boost, i would hate to see how much time you need to put into a 11.5 car with boost, just to make sure eveything is just right so no detonation is caused. I would say stick with the juice or trade someone internals and heads lol

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    torch red
    99 c5

    i'm only making 440 with a crappy intake. the car is starving for air. need the fast 90 setup with fast throttle body.. i'm running a polished holley wiend intake with stock throttle body. also i'm running shorty headers trying to save up for the long tubes. also on a mustang dyno. a little rough. but its better that way. should be looking close to 500 with the intake throttle body .. headers and a little more tuning. good deal i'll stay away from the boost and go with a 300 shot

  10. #10
    Veteran Hi-Po's Avatar
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    Quote Originally Posted by Y2KPewterSS View Post
    Boost + 11.5 compression =
    No doubt

  11. #11
    someday joejenkinsglass's Avatar
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    Quote Originally Posted by c5andtyphoon View Post
    i'm only making 440 with a crappy intake. the car is starving for air. need the fast 90 setup with fast throttle body.. i'm running a polished holley wiend intake with stock throttle body. also i'm running shorty headers trying to save up for the long tubes. also on a mustang dyno. a little rough. but its better that way. should be looking close to 500 with the intake throttle body .. headers and a little more tuning. good deal i'll stay away from the boost and go with a 300 shot
    with 300 nos that thing is gonna be like a rocket

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