Fuel pressure dropping??
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Teching In
Joined: Nov 2002
Posts: 40
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From: Ft. Lauderdale ,Florida
Fuel pressure dropping?? Between shifts fuel pressure momentary drops to around 20-30 psi than once back in gear(@WOT making boost) jumps back to around 56psi. Has anyone experienced this?
Does this sound normal?? Thanks.
<small>[ November 14, 2002, 12:50 AM: Message edited by: spectra57 ]</small>
Does this sound normal?? Thanks.
<small>[ November 14, 2002, 12:50 AM: Message edited by: spectra57 ]</small>
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Joined: Nov 2001
Posts: 3,048
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From: Raleigh, NC
Re: Fuel pressure dropping?? That can depend on your setup, but, it sounds normal to me.
I'm not an M6, I'm an A4. But, if I go WOT, there is a brief point where the fuel pressure drops to about 40, then slams back to 56 throughout WOT for me.
But, another thing I notice... if I go half-throttle, the pressure drops to about 40 PSI. Maybe you are in that state when you shift an M6. I'm not sure WHY the pressure is not up at that point. Not having a Fuel Pressure Guage on before the SC install limits my knowledge of what happens under "normal" conditions. But, it appears Fuel Pressure drops off at part throttle and maybe there's some relation to the flow of fuel and the partial or complete demand for it.
Heck! I don't know! <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
Somebody with real knowledge of our fuel systems, help us out here!
I'm not an M6, I'm an A4. But, if I go WOT, there is a brief point where the fuel pressure drops to about 40, then slams back to 56 throughout WOT for me.
But, another thing I notice... if I go half-throttle, the pressure drops to about 40 PSI. Maybe you are in that state when you shift an M6. I'm not sure WHY the pressure is not up at that point. Not having a Fuel Pressure Guage on before the SC install limits my knowledge of what happens under "normal" conditions. But, it appears Fuel Pressure drops off at part throttle and maybe there's some relation to the flow of fuel and the partial or complete demand for it.
Heck! I don't know! <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
Somebody with real knowledge of our fuel systems, help us out here!
Re: Fuel pressure dropping?? sheesh, i would be very worried about that... u guys need to toss that stock regulator..
neither of you are hearing audible pinging?
maybe your computer tunes are offset for this, but you really need he fuel pressure to Rise with boost, so the delta pressure is the same, every pound of boost you have in the intake pushes 1psi of fuel from going into the engine.
you will have to tune very rich to overcome this.
it could also be a sign of not enough fuel flow (pump)
neither of you are hearing audible pinging?
maybe your computer tunes are offset for this, but you really need he fuel pressure to Rise with boost, so the delta pressure is the same, every pound of boost you have in the intake pushes 1psi of fuel from going into the engine.
you will have to tune very rich to overcome this.
it could also be a sign of not enough fuel flow (pump)
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Joined: Nov 2001
Posts: 3,048
Likes: 12
From: Raleigh, NC
Re: Fuel pressure dropping?? MM, My understanding is that with the larger injectors and programming, the needed fuel gets there. More Fuel pressure is not needed... just more fuel. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
