fuel pressure
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Joined: May 2005
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From: knox. tn.
fuel pressure
I just recently put a adjustable fuel pressure reg. along with B & B 3 inch exhaust & slp cold air intake. I 've heard that the LT 4 runs best at 39 pds fuel pressure is that at idle or while applying the throttle??? ( everything else is stock ) I ve got it set at 39 at idle & runs much better & throttle response is better!!!!!!!!!!!!! 
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Joined: May 2005
Posts: 87
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From: knox. tn.
Originally Posted by fredk
I just installed one in my LT1 and it seems to run better. It's probably just our imagination. Did you set it a 39 lbs with the key on for 2 seconds as per the Haynes manual ?
Safety Car
Joined: Apr 2004
Posts: 4,532
Likes: 7
From: Lahaina Hi
Chevy said something about injector band width and fuel presure regulator being set at 39 lbs.
Fuel presure should be set with engine running and vaccum disconected.
I run mine at 39 on the street and at 40 psi with the barry grant nitrous on it.
I never realy played with the fuel presure at the track its too hot here .
One minute 89 degrees and when you pull up on the line 80 degrees.
All I know is 13.48 at 190 degrees motor and fuel pres at 39 psi,89 degrees out side.
It was good for the win and $500.00 this week end.
Fuel presure should be set with engine running and vaccum disconected.
I run mine at 39 on the street and at 40 psi with the barry grant nitrous on it.
I never realy played with the fuel presure at the track its too hot here .
One minute 89 degrees and when you pull up on the line 80 degrees.
All I know is 13.48 at 190 degrees motor and fuel pres at 39 psi,89 degrees out side.
It was good for the win and $500.00 this week end.
Burning Brakes
Joined: May 2005
Posts: 917
Likes: 55
From: Muskoka Ontario
Thanks for the reply, checked pressure again with vaccum off and it was still at 39. This is what TPIS recommends with a stock motor. I have also added 3.54 gears and an SLP cai, was running 14 flat, now hoping for mid 13's.
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