LT1 BOOST question!
LT1 BOOST question! Hey guys,
i have a 355 LT1 with AFR heads and a 223/230 .565 112LSA cam. Others specifics about the engine are in another thread of mine called LT1+boost.
long story short, I have a Procharger D1SC with a FMIC, 3” aluminum piping with T bolts and Red race Bypass valve. I have a 7.65” crank pulley and a 4.50” supercharger pulley (12rib). Bob at brute speed suggested this set up for 8lbs of boost! I spun the car up to 6,000rpm and I only hit 5lbs of boost. It seems the boost got up there fairly quickly then plateaued. I sent bob a video of me pushing and pulling on the belt to show tightness. He said he thinks it’s tight enough. And I used Procharger ls instructions on how to tighten the belt.
I was hooing for 8lbs and kind of upset it’s only hitting 5lbs. I am fairly certain I don’t have a leak. Not positive about the belt slip but it seems the belt it’s tight. Is it possible I need a smaller blower pulley? Or where else can I search?
i have a 355 LT1 with AFR heads and a 223/230 .565 112LSA cam. Others specifics about the engine are in another thread of mine called LT1+boost.
long story short, I have a Procharger D1SC with a FMIC, 3” aluminum piping with T bolts and Red race Bypass valve. I have a 7.65” crank pulley and a 4.50” supercharger pulley (12rib). Bob at brute speed suggested this set up for 8lbs of boost! I spun the car up to 6,000rpm and I only hit 5lbs of boost. It seems the boost got up there fairly quickly then plateaued. I sent bob a video of me pushing and pulling on the belt to show tightness. He said he thinks it’s tight enough. And I used Procharger ls instructions on how to tighten the belt.
I was hooing for 8lbs and kind of upset it’s only hitting 5lbs. I am fairly certain I don’t have a leak. Not positive about the belt slip but it seems the belt it’s tight. Is it possible I need a smaller blower pulley? Or where else can I search?
Hey guys,
i have a 355 LT1 with AFR heads and a 223/230 .565 112LSA cam. Others specifics about the engine are in another thread of mine called LT1+boost.
long story short, I have a Procharger D1SC with a FMIC, 3” aluminum piping with T bolts and Red race Bypass valve. I have a 7.65” crank pulley and a 4.50” supercharger pulley (12rib). Bob at brute speed suggested this set up for 8lbs of boost! I spun the car up to 6,000rpm and I only hit 5lbs of boost. It seems the boost got up there fairly quickly then plateaued. I sent bob a video of me pushing and pulling on the belt to show tightness. He said he thinks it’s tight enough. And I used Procharger ls instructions on how to tighten the belt.
I was hooing for 8lbs and kind of upset it’s only hitting 5lbs. I am fairly certain I don’t have a leak. Not positive about the belt slip but it seems the belt it’s tight. Is it possible I need a smaller blower pulley? Or where else can I search?
i have a 355 LT1 with AFR heads and a 223/230 .565 112LSA cam. Others specifics about the engine are in another thread of mine called LT1+boost.
long story short, I have a Procharger D1SC with a FMIC, 3” aluminum piping with T bolts and Red race Bypass valve. I have a 7.65” crank pulley and a 4.50” supercharger pulley (12rib). Bob at brute speed suggested this set up for 8lbs of boost! I spun the car up to 6,000rpm and I only hit 5lbs of boost. It seems the boost got up there fairly quickly then plateaued. I sent bob a video of me pushing and pulling on the belt to show tightness. He said he thinks it’s tight enough. And I used Procharger ls instructions on how to tighten the belt.
I was hooing for 8lbs and kind of upset it’s only hitting 5lbs. I am fairly certain I don’t have a leak. Not positive about the belt slip but it seems the belt it’s tight. Is it possible I need a smaller blower pulley? Or where else can I search?
__________________
ATI ProCharger and Moser Sales 260 672-2076
PM's disabled, please e-mail me
E-mail: brutespeed@gmail.comob@brutespeed.com
https://brutespeed.com/ Link to website
ATI ProCharger and Moser Sales 260 672-2076
PM's disabled, please e-mail me
E-mail: brutespeed@gmail.comob@brutespeed.com
https://brutespeed.com/ Link to website
Unfortunately I did ask it in the LT1 forum and didn’t get much response, sorry. I’ll see what I can figure out and maybe ill have to get another pulley. It seemed to level
out around 5k and not rise up to 6k which made me lay off the throttle.
Thanks for the help.
out around 5k and not rise up to 6k which made me lay off the throttle.
Thanks for the help.
Originally Posted by Puck
This should be in the LT1 section, but like Bob said you are not spinning high enough.
An AFR headed LT1 with built bottom end and that cam should be spinning to at least 6500rpm.
An AFR headed LT1 with built bottom end and that cam should be spinning to at least 6500rpm.
