Question about AFPR
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Member
Joined: Nov 1999
Posts: 429
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From: Fayetteville, Arkansas, USA
Car: 1994 Trans Am
Engine: 5.7L LT1
Transmission: 6-speed
Question about AFPR
I've been told that an AFPR will increase power and throttle response only at WOT and not part throttle. Is that true?
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'88 IROC 305 TPI
Crappy 700R4 slushbox
Gutted airboxes
180 degree T-stat
Advanced base TPS voltage
Relocated IAT sensor
Momo steering wheel (gotta luv it)
Ram-air setup coming soon
Flowmaster muffler (puke)
Taylor SpiroPro wires
Accel cap and rotor
Ported plenum
Kills: '94 Z28, Olds Aurora V8, bunch of Mustangs, T-birds, ricers, and others who assumed a 12 year-old car would be too slow.
------------------
'88 IROC 305 TPI
Crappy 700R4 slushbox
Gutted airboxes
180 degree T-stat
Advanced base TPS voltage
Relocated IAT sensor
Momo steering wheel (gotta luv it)
Ram-air setup coming soon
Flowmaster muffler (puke)
Taylor SpiroPro wires
Accel cap and rotor
Ported plenum
Kills: '94 Z28, Olds Aurora V8, bunch of Mustangs, T-birds, ricers, and others who assumed a 12 year-old car would be too slow.
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Joined: Jan 2000
Posts: 19,653
Likes: 309
88,
Under normal conditions, the ECM will do everything it can to adjust the fuel injector pulses to whatever pulse width is necessary to keep the oxygen sensor within a specified range. Because of this, adjusting fuel pressure will have little effect on the fuel mixture under most conditions.
However, when the throttle is opened beyond 80% (WOT) the ECM will default to a maximum injector pulse width (80% duty cycle) to provide maximum fuel for heavy acceleration. This is when adjusting (increasing) the fuel pressure can provide extra power for higher RPM operation without excesively lean conditions that can limit power and cause detonation and damage. If your engine starts to lose power rapidly above 4,000 RPM, you might benefit from some additional fuel at WOT.
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Later,
Vader
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"I'm'a do Things My Way - It's My way or the Highway."
Adobe Acrobat Reader
Under normal conditions, the ECM will do everything it can to adjust the fuel injector pulses to whatever pulse width is necessary to keep the oxygen sensor within a specified range. Because of this, adjusting fuel pressure will have little effect on the fuel mixture under most conditions.
However, when the throttle is opened beyond 80% (WOT) the ECM will default to a maximum injector pulse width (80% duty cycle) to provide maximum fuel for heavy acceleration. This is when adjusting (increasing) the fuel pressure can provide extra power for higher RPM operation without excesively lean conditions that can limit power and cause detonation and damage. If your engine starts to lose power rapidly above 4,000 RPM, you might benefit from some additional fuel at WOT.
------------------
Later,
Vader
------------------
"I'm'a do Things My Way - It's My way or the Highway."
Adobe Acrobat Reader
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