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Less Boost=Less Horsepower?

This is a discussion on Less Boost=Less Horsepower? within the Forced Induction forums, part of the LSx Technical Help Section category; Ok guys,I know whatIi'm going to ask goes against eveything on this site but here goes. I have a C5 ...

  1. #1
    Junior Member spitfun's Avatar
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    Less Boost=Less Horsepower?

    Ok guys,I know whatIi'm going to ask goes against eveything on this site but here goes. I have a C5 Z06 Corvette with a boosted LS1 with 800 HP at the crank in it. I autocross the car and am finding that this is a challenge to modulate the throttle without breaking the tires loose all too often. I am thinking about cutting the boost and a tune to get it down to maybe 600 HP-would this be as easy as a smaller pulley on the Vortech supercharger and a tune or would it need more work done to it? Here is a list of what is in the motor now:

    Forged LS1 with Wiseco Pistons, Callie's rods and Arp bolts. Stock LS6 is 100% and comes with car.
    A&A Vortec Si blower 3.4 pulley
    Advance Inductions 226cc ported heads with BTR springs and rocker trunion upgrade.
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    60lb injectors with in tank C6z06 fuel pump and kenne bell boost a pump
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    ECS trans/diff brace

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    Maybe I am misunderstanding you, but a smaller pulley on the supercharger will spin faster and create more boost, not less.

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    Junior Member spitfun's Avatar
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    Sorry,I meant could a different size pulley be installed on the supercharger...

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    I don't see why it couldn't, but that's a lot of HP/TQ you're looking to lose. Not sure how you determine how much boost you'd make with what pulley size on your exact setup.

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    Yes, you can change pulleys and technically make less power. Honest answer, you may be better off running a car that is setup for what you want to do versus compromising what you already have.

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    Senior Member Whamhammer's Avatar
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    A cam built for higher rpm power would help, as much of auto crossing is at light/part throttle.
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    Senior Member Naaman's Avatar
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    Giant Dicks Car Club Zapper2003's Avatar
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    Less Boost=Less Horsepower?

    boost is a funny thing on the autocross course. truth is, from my experience, you'll need to find a setup that is going to net the flattest torque curve. I run with a few guys with turbo cars and they're downright wild when the boost comes on. granted, your supercharger is a different ballgame, but I believe the concept is the same. you don't need maximum power, but it needs to be managed in such a way that it's linear in it's delivery and not just a huge kick in the pants.

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