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Old 12-24-2012, 12:45 PM   #1
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Question Fuel Pressure

What fuel pressure are you guys running? Please list your setup with pressure. (Injectors**, fuel pump, fuel lines, fuel rail, turbo, boost, power ect.)

I have an idea of what I want to run but just curious to see what's common or normal.

Updated ;-) Thanks Joe

Last edited by TheDriver; 12-24-2012 at 01:56 PM.
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Old 12-24-2012, 01:24 PM   #2
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I didn't see you mention the most important variable, which is injector size.

Replacing the fuel pump and filter is good preventative maintenance on a 15-20 year old car, but aside from that, you shouldn't need to upgrade anything else at reasonable power levels. On my last car (1.6) I was using stock lines, rail, FPR, etc, with a TD04H-15G turbo at 14 PSI making 210 WHP. This was with a set of 440cc-rated injectors, and I had a fair bit of headroom left- duty cycle never went much above 70%.
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Old 12-24-2012, 01:58 PM   #3
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FYI I am going to be running a built 1.9, with ID 1000's and a bosch 044 shooting for 400-450 on race gas. Thinking of running around 50 psi but not sure if that's really over kill.

Edit: Other notable items: stock fuel lines, M-tuned fuel rail
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Old 12-24-2012, 02:44 PM   #4
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Walbro 190hp & DW800cc. With 80psi fuel pressure DC% is around 75%. E85 and around 300whp

Stock NB return style fuel system with m-tuned dual feed fuel rail
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Old 12-24-2012, 06:15 PM   #5
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Quote:
Originally Posted by muoto View Post
Walbro 190hp & DW800cc. With 80psi fuel pressure DC% is around 75%. E85 and around 300whp

Stock NB return style fuel system with m-tuned dual feed fuel rail
Dayum, not worried about that fuel pump at that pressure?
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Old 12-24-2012, 06:27 PM   #6
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Quote:
Originally Posted by TheDriver View Post
Dayum, not worried about that fuel pump at that pressure?
I am. DW300 pump is going in next. Also 800cc isnt enought, maybe I get ID1000 or 1200cc next
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Old 12-24-2012, 08:03 PM   #7
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Quote:
Originally Posted by muoto View Post
I am. DW300 pump is going in next. Also 800cc isnt enought, maybe I get ID1000 or 1200cc next
ID > DW. I have ran both ID1000's and DW1000's in my car and the ID's are by a long shot better then DW.

I think ID's like to run a bit higher then stock fuel pressure. Looking around on their site it seems at about 70psi that the ID1000's should top out at about 1100cc.

One day when I have time to convince Tim to build me a dual feed fuel rail I will switch over to an AFPR and raise my pressure up from the stock levels.
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Old 12-24-2012, 08:15 PM   #8
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With IDs and an aftermarket FPR, I would run ~50psi on gas and ~70psi on E85.
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Old 12-24-2012, 08:24 PM   #9
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Quote:
Originally Posted by Savington View Post
With IDs and an aftermarket FPR, I would run ~50psi on gas and ~70psi on E85.
Is there a reason you don't run higher with gas? Is it because the extra head room is not needed?
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Old 12-26-2012, 01:10 AM   #10
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Quote:
Originally Posted by shuiend View Post
Is there a reason you don't run higher with gas? Is it because the extra head room is not needed?
Idle, basically. If you can still idle stoich at 70psi base, then go for it. The IDs want to be run around ~90psi rail at WOT.
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Old 12-27-2012, 03:43 AM   #11
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I idle at 80psi. With ID1000. No problemo.
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