Fuel pressure fixed, or vacuum while tuning
Thread Starter
TGO Supporter
Joined: Jul 2001
Posts: 404
Likes: 1
From: Evansville, IN USA
Car: '89 GMC Pickup
Engine: 383 SBC Stealth Ram
Transmission: 700R4/VIG 3200
Fuel pressure fixed, or vacuum while tuning
How do you all tune your chips. With, or without the fuel pressure regulator hooked up?
It seems to be results would be more consistent with it fixed at a certain pressure that always stayed the same.
Variable opinions welcome. . .
Thanks,
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_ ___ _
SMasterson
It seems to be results would be more consistent with it fixed at a certain pressure that always stayed the same.
Variable opinions welcome. . .
Thanks,
------------------
_ ___ _
SMasterson
Supreme Member
iTrader: (1)
Joined: Oct 2000
Posts: 1,062
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From: Pasadena, MD
Car: '87 Camaro IROC-Z
Engine: 385 HSR
Transmission: 700R4
Axle/Gears: 3.42 posi
With it hooked up, since that's how I drive and race my car. 
Also, the fuel pressure rises due to the change in vacuum in the plenum, so even though the -gauge- pressure is higher, the injectors aren't delivering any more fuel than before since they're injecting into atmospheric pressure (at WOT) vs. a vacuum (less than WOT).
Greg Westphal
'87 IROC 355TPI/A4
[This message has been edited by GregWestphal (edited October 17, 2001).]
Also, the fuel pressure rises due to the change in vacuum in the plenum, so even though the -gauge- pressure is higher, the injectors aren't delivering any more fuel than before since they're injecting into atmospheric pressure (at WOT) vs. a vacuum (less than WOT).Greg Westphal
'87 IROC 355TPI/A4
[This message has been edited by GregWestphal (edited October 17, 2001).]
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