LT1 Procharger Question!
Thread Starter
Racer
Joined: Sep 2002
Posts: 337
Likes: 2
From: New Orleans La
LT1 Procharger Question!
I have a 93 vette LT1 I was getting about 7 lbs of boost or so.
I know for a fact it was on the far side of the numeral 5 on my Auto Meter boost gauge.
I changed my belt,started splitting, and that's when I noticed I was only getting around 4 to 4.5 lbs of boost.
I called Pro Charger and they gave me another Gates belt number that was 5/8 smaller in circumference and I thought for sure that was the problem but it's still the same.
I then thought about the air cleaner and removed it but that didn't help either.
I don't know how much heat effects the boost but it was 85 this evening.
I guess I'll call Pro Charger again tomorrow and see what they say/
I'm just curious. What do people with my set-up get for boost?
It's a P1SC with a stock 3.6" pulley.
I know for a fact it was on the far side of the numeral 5 on my Auto Meter boost gauge.
I changed my belt,started splitting, and that's when I noticed I was only getting around 4 to 4.5 lbs of boost.
I called Pro Charger and they gave me another Gates belt number that was 5/8 smaller in circumference and I thought for sure that was the problem but it's still the same.
I then thought about the air cleaner and removed it but that didn't help either.
I don't know how much heat effects the boost but it was 85 this evening.
I guess I'll call Pro Charger again tomorrow and see what they say/
I'm just curious. What do people with my set-up get for boost?
It's a P1SC with a stock 3.6" pulley.
Pro
Joined: Dec 2002
Posts: 704
Likes: 16
From: Dallas Texas
I have a 93 vette LT1 I was getting about 7 lbs of boost or so.
I know for a fact it was on the far side of the numeral 5 on my Auto Meter boost gauge.
I changed my belt,started splitting, and that's when I noticed I was only getting around 4 to 4.5 lbs of boost.
I called Pro Charger and they gave me another Gates belt number that was 5/8 smaller in circumference and I thought for sure that was the problem but it's still the same.
I then thought about the air cleaner and removed it but that didn't help either.
I don't know how much heat effects the boost but it was 85 this evening.
I guess I'll call Pro Charger again tomorrow and see what they say/
I'm just curious. What do people with my set-up get for boost?
It's a P1SC with a stock 3.6" pulley.
I know for a fact it was on the far side of the numeral 5 on my Auto Meter boost gauge.
I changed my belt,started splitting, and that's when I noticed I was only getting around 4 to 4.5 lbs of boost.
I called Pro Charger and they gave me another Gates belt number that was 5/8 smaller in circumference and I thought for sure that was the problem but it's still the same.
I then thought about the air cleaner and removed it but that didn't help either.
I don't know how much heat effects the boost but it was 85 this evening.
I guess I'll call Pro Charger again tomorrow and see what they say/
I'm just curious. What do people with my set-up get for boost?
It's a P1SC with a stock 3.6" pulley.
I used to see about 6 psi with my stock setup and then went to a smaller pulley and saw less boost (more belt slip). Any additional drag on the belt will cause slip at the crank pulley--very little belt wrap on the crank pulley. There are some fixes out there for this condition, just need to do a search.
Former Vendor
Joined: Dec 2006
Posts: 2,239
Likes: 1
I have a 93 vette LT1 I was getting about 7 lbs of boost or so.
I know for a fact it was on the far side of the numeral 5 on my Auto Meter boost gauge.
I changed my belt,started splitting, and that's when I noticed I was only getting around 4 to 4.5 lbs of boost.
I called Pro Charger and they gave me another Gates belt number that was 5/8 smaller in circumference and I thought for sure that was the problem but it's still the same.
I then thought about the air cleaner and removed it but that didn't help either.
I don't know how much heat effects the boost but it was 85 this evening.
I guess I'll call Pro Charger again tomorrow and see what they say/
I'm just curious. What do people with my set-up get for boost?
It's a P1SC with a stock 3.6" pulley.
I know for a fact it was on the far side of the numeral 5 on my Auto Meter boost gauge.
I changed my belt,started splitting, and that's when I noticed I was only getting around 4 to 4.5 lbs of boost.
I called Pro Charger and they gave me another Gates belt number that was 5/8 smaller in circumference and I thought for sure that was the problem but it's still the same.
I then thought about the air cleaner and removed it but that didn't help either.
I don't know how much heat effects the boost but it was 85 this evening.
I guess I'll call Pro Charger again tomorrow and see what they say/
I'm just curious. What do people with my set-up get for boost?
It's a P1SC with a stock 3.6" pulley.
I'd also check all of your plumbing connections for the possibility of a boost leak. Bob
Melting Slicks
Joined: Mar 2008
Posts: 3,022
Likes: 3
From: Chandler Arizona
Herb-
I've gone through a number of blown cars and the one problem always seemed to be the stock pulley itself! The way the pulley is "cut" can cause slippage (not enough surface contact between the belt and the tread on the belt).
Contact Greg at Blowerworks and pick up a pulley set from him. I am currently seeing 8-9psi of boost with his head unit pulley (of course, i also have an auto-tensioner on the stock vortech bracket and an added idler to promote better belt wrap).
***edit****
the peaks and valleys are sometimes off on pulleys.
I've gone through a number of blown cars and the one problem always seemed to be the stock pulley itself! The way the pulley is "cut" can cause slippage (not enough surface contact between the belt and the tread on the belt).
Contact Greg at Blowerworks and pick up a pulley set from him. I am currently seeing 8-9psi of boost with his head unit pulley (of course, i also have an auto-tensioner on the stock vortech bracket and an added idler to promote better belt wrap).
***edit****
the peaks and valleys are sometimes off on pulleys.
Last edited by mnstrlt1; Jun 19, 2009 at 03:02 PM.
Instructor
Joined: Jul 2009
Posts: 121
Likes: 0
Hey.
Do a throrough double check on how you route the belt on all of the idler pulleys. I just finished a water pump and I put my belt back on. I racall there are a couple of ways you can route the idler near the procharger and the one near the alternator underneath and they look right.
When I did it, it seems like the belt was a lot looser and tensioner had more range than when it came ioff. I grabbed to routing diagram and slowly traced and viola rerouted and all was as good as before.
My Gates belt is K06-0956 ATI says 96 and 1/8th or 2441.6 metric
Do a throrough double check on how you route the belt on all of the idler pulleys. I just finished a water pump and I put my belt back on. I racall there are a couple of ways you can route the idler near the procharger and the one near the alternator underneath and they look right.
When I did it, it seems like the belt was a lot looser and tensioner had more range than when it came ioff. I grabbed to routing diagram and slowly traced and viola rerouted and all was as good as before.
My Gates belt is K06-0956 ATI says 96 and 1/8th or 2441.6 metric
