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Fuel Pressure 

 

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 Post subject: Fuel Pressure
Posted: Thu Nov 27, 2008 10:21 pm 
Getting Side Ways
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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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Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

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Posted: Fri Nov 28, 2008 12:03 am 
Getting Side Ways
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what are your idle A/F ratio?
You could try upping the fuel pressure to 44
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Posted: Fri Nov 28, 2008 8:59 am 
Getting Side Ways
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Ride: EL XR8, '08 Mondeo XR5t

Power: 205 rwkw

Location: Perth
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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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Posted: Fri Nov 28, 2008 1:27 pm 
Getting Side Ways
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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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Posted: Fri Nov 28, 2008 2:18 pm 
Getting Side Ways
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Ride: EL XR8, '08 Mondeo XR5t

Power: 205 rwkw

Location: Perth
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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?

 

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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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Posted: Fri Nov 28, 2008 3:12 pm 
Getting Side Ways
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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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Posted: Sun Nov 30, 2008 1:30 pm 
Getting Side Ways
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Ride: EL XR8, '08 Mondeo XR5t

Power: 205 rwkw

Location: Perth
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66 coupe 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?

 

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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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Posted: Sun Nov 30, 2008 2:18 pm 
Getting Side Ways
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40 psi without vacuum attached
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Posted: Mon Dec 01, 2008 12:31 am 
Getting Side Ways
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Ride: EL XR8, '08 Mondeo XR5t

Power: 205 rwkw

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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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Posted: Mon Dec 01, 2008 2:37 am 
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prob around 30-32 psi thereabouts
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Posted: Mon Dec 01, 2008 8:49 am 
Getting Side Ways
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Age: 39

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Ride: EL XR8, '08 Mondeo XR5t

Power: 205 rwkw

Location: Perth
WA, Australia

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

 

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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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