Low Boost Solution
Thread Starter
Instructor
Joined: Feb 2015
Posts: 143
Likes: 0
Low Boost Solution
Running heartbeat for a year now on 08 C6. Pulley is .84 that had a boost 8 psi. For a gew months in garage and workshop, it shows 6 psi. I changed the belt and checked intake and all seem fine but still runs same low boost. I have another pulley .81 but prefer fixing the problem rather going around it. What possible solutions should I consider!
Le Mans Master
Joined: Dec 2005
Posts: 6,995
Likes: 1,680
From: Southeast TX
I'm assuming you mean 84mm pulley. You should have a hell of a lot more boost than 6psi unless you're up in the clouds, have a very nasty cam, very open exhaust....and ported heads. How are you set up?
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,341
From: Gilbert AZ
First of all, forget XXX pulley=XXX boost. That doesn't mean anything.
Weather, air filter, heads, cam, headers, exhaust, elevation, motor size, etc etc etc etc etc all effect boost levels.
If it was 8psi, and now went down to 6, check the weather, air filter, leaks, and belt for wear and proper tension.
Weather, air filter, heads, cam, headers, exhaust, elevation, motor size, etc etc etc etc etc all effect boost levels.
If it was 8psi, and now went down to 6, check the weather, air filter, leaks, and belt for wear and proper tension.
Thread Starter
Instructor
Joined: Feb 2015
Posts: 143
Likes: 0
Set up is:
Cam
225/230
.617"/612"
114 LSA
kooks headers, corsa x pipe and cat-back (no cats). I use the air intake and filter that came with blower package. Alkey meth. Still at same city. And hp did not show a notable drop, 608 rwhp.
The thing is I had ~8 to 9 psi on same 84mm pulley and set up. Few months back it has been max 6.
I saw 11psi on 81mm in the past also.
Ok, I re-tuned and changed MAF but that is irrelevant I assume.
Cam
225/230
.617"/612"
114 LSA
kooks headers, corsa x pipe and cat-back (no cats). I use the air intake and filter that came with blower package. Alkey meth. Still at same city. And hp did not show a notable drop, 608 rwhp.
The thing is I had ~8 to 9 psi on same 84mm pulley and set up. Few months back it has been max 6.
I saw 11psi on 81mm in the past also.
Ok, I re-tuned and changed MAF but that is irrelevant I assume.
Last edited by VetteArts; Apr 13, 2018 at 06:45 AM.
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