Pulse width

1fastlaser · 08-01-2004, 10:51 AM

Yes i have searched and im sure its been beating to death.

my setup
big 16g ported to hell

vpc-afc
ported head
95 pistons
front mount
550s
walbro 255 -4 lines sending and return to tank-custom fuel rail
msd dis 2
95 ported manifold
tial 35mm
full 3 inch
Im getting 20-22ms on the pulse width on the tmo which i know is insane.
My base fp with the vacuum line unhooked is 40psi
I run between 17-20psi on pump gas and im getting this reading.Knock yes its up and my timing is running about 5-14 on it which i know is very bad
base timing is 7-8 right now.

I def think its time for some bigger injectors 660s or 720s..What is everyones insite on this.I just love opinions
thanks guys

Tyler_Baker · 08-01-2004, 12:01 PM

First I would set your base timing to 5 or 4 degrees before TDC. Maybe run 45 psi of base FP so that you have to take airflow away on your afc which will advance your timing. On another note, how is your O2 sensor doing? My timing was low when my O2 sensor was dead. Just some things to think about.

1fastlaser · 08-01-2004, 12:07 PM

well lets just say...i have no error code but i ran c16 atleast 15 times.

I got a new o2 sitting but i havent got around to putting it on.Yeah i was gonna pull timing out to factory and bump the fp alittle and go from there.

I def think maybe a o2 sensor should go in too.I wanna work out this problem now because id rather tune it now get it figured out and then go to bigger injectors.

1fastlaser · 08-01-2004, 03:08 PM

just logged the car..even on lower boost 15psi the injectors go to 21 22ms on the pulse width there has got to be something wrong.

steve · 08-01-2004, 03:51 PM

When was the last time you ran a intake pressure test? Is there a chance your leaking?

Steve

kpt4321 · 08-02-2004, 05:41 AM

Yup, it could b a boost leak, bad tuning, or just too much airflow for those injectors (or a combination of the three).

1fastlaser · 08-02-2004, 11:00 AM

Yeah i think i finally came to the conclusion that the injectors are maxed out.I got a 50 trim on the way so 660s are following ill just have to see how it works out.Of course im going go over all my connections to see if there is a boost leak