Results 1 to 8 of 8
Like Tree1Likes
  • 1 Post By pajeff02

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
    Join Date
    Jan 2017
    Location
    Michigan
    Posts
    2

    Black
    2003 Corvette Z06

    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.
    Custom spec blower cam, LS7 lifters with hardened 7.35 pushrods.
    Custom 4" blower inlet
    Methanol Injection
    Dewitt's cutdown radiator with spal fans
    ARH 1 7/8" headers ceramic coated
    Corsa exhaust
    Mantic 9000 dual disk clutch with remote bleeder.
    60lb injectors with in tank C6z06 fuel pump and kenne bell boost a pump
    RPM Poly driveshaft couplers
    RPM level 3 diff with 3.73 gears
    ECS trans/diff brace

  2. #2
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,204

    Black & Blue
    '02 WS.6 / '07 Suburban

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

    Welcome to the site!

  3. #3
    Junior Member spitfun's Avatar
    Join Date
    Jan 2017
    Location
    Michigan
    Posts
    2

    Black
    2003 Corvette Z06

    Sorry,I meant could a different size pulley be installed on the supercharger...

  4. #4
    Moderator 35th-ANV-SS's Avatar
    Join Date
    Oct 2008
    Location
    Wherever life takes me
    Posts
    12,381

    Red
    02 35th LE Camaro SS

    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.

    Sent from my SM-G900V using Tapatalk
    It's on jackstands.

  5. #5
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,204

    Black & Blue
    '02 WS.6 / '07 Suburban

    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.

  6. #6
    Senior Member Whamhammer's Avatar
    Join Date
    Sep 2010
    Location
    Bel Air, Maryland
    Posts
    1,051

    Silver
    '02 Trans Am WS-6, 6M

    A cam built for higher rpm power would help, as much of auto crossing is at light/part throttle.
    SLP Air Lid/Smooth Bellows
    Kooks Emissions LT Headers/Catted Y pipe
    Magnaflow Cat-back
    Walbro 255 fuel pump
    Spohn Front Upper and Lower Tubular Control Arms
    UMI Rear Lower Control Arms/ Adjustable Panhard Rod
    Factory C5 Z06 17x9.5 wheels w/ 285-40-17 Continental Extreme Contact DW's all the way around.
    Dyno Dynamics dynoed @:
    356 rwhp, 360 rwlb/tq

  7. #7
    Senior Member Naaman's Avatar
    Join Date
    Mar 2010
    Location
    AZ
    Posts
    1,316

    Cayanne
    98 Z28 Vert M6

    Or get fatter tires!!!!!!
    Lid, Throttle Body, LS6 Intake, Stage 1 Heads, Mild Cam, Magnaflow Cat-Back, LS7 Clutch, SFCs, STB, Panhard Bar, Strano Springs, Strano Sway Bars, LCAs, Konis (F), Bilstiens (R), MGW Shifter

  8. #8
    Giant Dicks Car Club Zapper2003's Avatar
    Join Date
    Nov 2006
    Location
    Millerton, PA
    Posts
    5,100

    2005 Ram
    1978 Firebird

    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.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. PTK results on stock engine at 7 PSI boost
    By Darren P in forum Forced Induction
    Replies: 3
    Last Post: 10-19-2005, 12:28 PM
  2. PTK results on stock engine at 7 PSI boost
    By Darren P in forum Forced Induction
    Replies: 0
    Last Post: 10-17-2005, 07:55 PM
  3. Give your ride a BOOST with a Vortech supercharger!
    By tbyrne in forum Sales and Group Purchases from our Great Sponsors!
    Replies: 0
    Last Post: 08-02-2005, 07:40 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •