installed the AFPR, what fuel pressure?

mystang94gt

New Member

Jun 14, 2004

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Bay Area, CA

Sep 29, 2004

#1

• Sep 29, 2004

• #1

Well I pulled the upper manifold last night, retorqued the lower, replace my pcv valve and screen and also replaced a piece of vacuum line that was decaying. Then I installed my Kirban AFPR and set it at 43 lbs vacuum off. Goes down to 38 lbs when I plug the vacuum back in. Set the timing at 14* and took it for a spin. Slammed it through first and second with no pinging. But the car wasnt fully warmed up yet and today on my way to work it started to ping just a little. So I was planing on either lowering the timing a bit or bumping the fp up to maybe 45. Is that too high? What do guys think?

Thanks

 

Yellow302

Member

Mar 2, 2003

789

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19

NJ

Sep 29, 2004

#2

• Sep 29, 2004

• #2

i have a kerbin but it sounds like you dont have enough vaccume.

mine is set at 42 (checked thismorning) with vaccum it drops to 32-34.

my timing is unknown at the moment but somewhere between 12-14*

 

mystang94gt

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Jun 14, 2004

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Bay Area, CA

Sep 29, 2004

#3

• Sep 29, 2004

• #3

I have a vacum gauge so I can check the vacume tonight. Does anyone know what the vacume should be?

 

ALMOSTFINISHED

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Jan 8, 2004

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Westchester County NY

Sep 29, 2004

#4

• Sep 29, 2004

• #4

Not to rob the thread, but i have a similar question myself. with the mods i have what should my fuel pressure be set at with the vacuum line off? I had it so when the vac line was on it was at about 39 lbs... that sound ok???


thanks

Nick

 

mystang94gt

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Jun 14, 2004

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Bay Area, CA

Sep 29, 2004

#5

• Sep 29, 2004

• #5

Yeah I will probably lower the timing tonight back down to 10*. Hopfully that cures it. Also have a bad Cat that needs replacing.

ALWAYS SOMETHING. LOL

 

94TURBO5 O

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Mar 14, 2004

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VA

Sep 29, 2004

#6

• Sep 29, 2004

• #6

Put it at 38-42 with the vac line off. It will go up under acceleration. I would come back down off your timing to 10* but raising the FP won't hurt cha except in the wallet.

 

94TURBO5 O

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Mar 14, 2004

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Sep 29, 2004

#7

• Sep 29, 2004

• #7

ALMOSTFINISHED said:

Not to rob the thread, but i have a similar question myself. with the mods i have what should my fuel pressure be set at with the vacuum line off? I had it so when the vac line was on it was at about 39 lbs... that sound ok???


thanks

Nick

Click to expand...

Yep sounds fine. My max was 60psi with 42's and a S-Trim until I got an O4 PMS and now I'm back down the 38 with the line off.