ok.. right now in my sfmu im running the smaller black spring, and the 2.72 disc and ring. i have 310cc injectors and my idle fuel is around 22psi, but im putting in some 440cc injectors.. should i change anything in the sfmu? i know i need to turn the fuel pressure down to about 10 to 15psi of fuel.

any thoughts?

thanx
James

bumpsky

Someone (Murix!) please answer this...

I have the big disk and big silver spring, and my FP is close but no cigar... haven't blown up yet, but I'm far from tuned.

I run 20psi idle FP on my Ford 440's which is about the minimum for them. Jamesman has RC? 440's and I believe he runs about 18psi FP at idle.

the big disk as in the 3" disk?

why is the black smaller spring used? only for 310cc?

thanx
James

I have 440's i used the smallest disk on the sfmu and put the pressure at 11-12 and was still rich, so I had to help out with the SAFC, I got the "low" settings at -10. and the car runs fine with those settings.

>I have 440's i used the smallest disk on the sfmu and put the
>pressure at 11-12 and was still rich, so I had to help out
>with the SAFC, I got the "low" settings at -10. and the car
>runs fine with those settings.
>


what your boost fuel pressure like? and at how much boost?

James

well i was breaking in my engine so the max boost I saw was 4-5 psi. don't remember the fuel pressure, but do know it was runing rich. (my tranny broke so i have not been able to go up to 15 psi yet)
you will need to use the small disk, of that I'm almost 100% positive. and then fine tune for idle and for WOT with the safc.

which spring should i run with? oh and that is the smallest ring and disk that comes with the kit correct?

thanx for the info
James

Run the dark spring that you have in there......it allows you to run lower idle fuel pressures.

yup like he said :) that spring with the smallest disk the kit comes with.

cool, thanx a lot guys.. if i can get these 450cc injectors to work, then i might be in business with more HP.. hehe im sitting at 310hp, but 350 would also be nice.

James

310hp eh, didnt u just post a dyno sheet hittig around 260ish, far from 310 imo.

DWAYNE H


www.gottude.com
Red/Black/Silver 01 GSXR 750
Lots of Apexi components...

that was about a month ago when i dynoed... but sorry, i meant 310 to the crank, not wheels.

James