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Scaffy
 Post subject: Fuel Pressure
Posted: Thu Nov 27, 2008 10:21 pm 
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Hi all,

I'm having a problem with a lean idle and nothing I do seems to help. My fuel pressure is set to 39psi without vacuum. I'm interested to know what pressure anyone elses is with vacuum attached, at idle, or what it should be.

Thanks

 

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66 coupe
Posted: Fri Nov 28, 2008 12:03 am 
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what are your idle A/F ratio?
You could try upping the fuel pressure to 44
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Scaffy
Posted: Fri Nov 28, 2008 8:59 am 
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Idle afrs are sitting around 18:1. If I increase pressure to 44 would that not pump more fuel in across the board and I end up rich everywhere else?

 

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Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty
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66 coupe
Posted: Fri Nov 28, 2008 1:27 pm 
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yeah upping the fuel pressure will increase it across the board.
If its that lean at idle, check for vacuum leaks and intake duct leaks, or possibly a bad / mismatched MAF.
whats the A/F ratio's like at wot? do they come back down to the 12's?
Is it running a chip?
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Scaffy
Posted: Fri Nov 28, 2008 2:18 pm 
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I'm running a tweecer. Using binary editor.

AFRs are sitting around the mid 12s at WOT. Cruise it sits on 14.7 in CL. It's just at idle I'm having the problem. The maf is an AU 73mm with stock electrics.

What should fuel pressure at idle be with the vacuum attached?

 

_________________

Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty
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66 coupe
Posted: Fri Nov 28, 2008 3:12 pm 
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around 40psi is where you would want it (275 kpa)
use the tweecer to lower the ve table around the idle area to richen the mixtures
aim for mid to high 12's around the idle bins
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Scaffy
Posted: Sun Nov 30, 2008 1:30 pm 
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{USERNAME} wrote:
around 40psi is where you would want it (275 kpa)


Sorry, just to clear this up for me, I should be seeing around 40psi with the vacuum attached to the AFPR?

 

_________________

Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty
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66 coupe
Posted: Sun Nov 30, 2008 2:18 pm 
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40 psi without vacuum attached
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Scaffy
Posted: Mon Dec 01, 2008 12:31 am 
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Yeah, that's where I'm at... well 39psi. Now, when I reattach the vacuum, any idea what pressure I should be seeing at idle?

 

_________________

Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty
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66 coupe
Posted: Mon Dec 01, 2008 2:37 am 
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prob around 30-32 psi thereabouts
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Scaffy
Posted: Mon Dec 01, 2008 8:49 am 
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Sweet, that's where it is. Cheers.

I've had no time to work on it the past few days and today is looking no better. Hopefully I can find time this arvo

 

_________________

Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty
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