help, fuel problem with duty cycle

O

orangemachine

New Member

Apr 5, 2007

62

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pa

Oct 23, 2007

#1

• Oct 23, 2007

• #1

I have dual focus pumps, stage 2 fpdm, 42lb injectors, and a wire upgrade with a 30 amp inline fuse for my fuel setup. That setup is good for about 550rwhp. However, I just got my stang tuned and she hit 100% duty cycle at 6400rpm at 453rwhp.

There is a problem somewhere and I don't know where to start. Could a fuel filter be a problem? (still stock one in and its a 00 GT). Could my sodered connections be a problem? A ground?

Any advice would help.

 

DBMSTNG

I fantasize about it being BIG!

Founding Member

Apr 23, 2002

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not quite here

Oct 23, 2007

#2

• Oct 23, 2007

• #2

what was the fuel pressure?

what was the a/f ratio?

 

C

chuck943

New Member

Oct 26, 2002

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north carolina

Oct 23, 2007

#3

• Oct 23, 2007

• #3

Read this article, esp. page 8, it might give you some answers you are looking for.
http://www.kennebell.net/media/articles/FUELFLOWFORENSICS.pdf

 

O

orangemachine

New Member

Apr 5, 2007

62

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pa

Oct 23, 2007

#4

• Oct 23, 2007

• #4

according to SGS Automotive who tuned my car, my fuel pressure was completely fine and the A/F ratio was 11.7 across the board.

they told me that my setup was good for 550rwhp as well as others.

do you have to pull the stock mini-fuse out of the fuse box? i left mine in there. do i need a 40 amp inline fuse instead of a 30?

can fuel filters clog?

i read all that stuff from KB about flow, pressure, and lph.

 

Stan Weiss

Member

Dec 8, 2006

347

2

16

Philadelphia, PA

Oct 23, 2007

#5

• Oct 23, 2007

• #5

DBMSTNG said:

what was the fuel pressure?

what was the a/f ratio?

Click to expand...

Remember your 42 lb injectors are rated at a fuel pressure, if your fuel pressure is lower then the rating goes down.