small tuning problem, need advice, suggestions

mdr40z

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Mar 31, 2005
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the worse thing in the world you could do is to just arbitrarily adjust your fp, please take steps to analyze how your car is running and adjust/tune accordingly..... they all are different
 

grimreaper

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Jul 2, 2008
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you need to check your Vf's this is the signal the AFM is sending to the ECU. i bet u this number will be bouncing all over the place, commonly caused by a bad AFM sensor, or plug.

vf's are how much fuel the ecu is adding or pulling in closed loop to maintain stoich (like fuel trims). The ks signal is the afm output used by the ecu.
 

jdub

Official SM Expert: Motor Oil, Lubricants & Fil
SM Expert
Feb 10, 2006
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Koenigturbo;1328380 said:
"Oh no, no, don't take my comment as negative, I shouldn't have said that. I really apreciate your help. Just to let you and every know, I do not ever say bad things to anyone EVER. I keep my comments to myself, childish comments are NOT what I'm about, they do not get me anywhere or results. "Jdub" I really apprecieate your help, your smart guy. Why would I be a smart ass when I'm need help, so, please, do not take it as a smart ass comment.

What I meant was, I'm really surprized that I have mine set so high, I need to readjust it, that's why I said "No Shit" and not what you think I said. "No shit" was not address to you, it was address to my mistake on the f.p.

as I've said, "JDub", I apprecieate your/ everyones help and would not jepordize it (see, I can't spell).

Thanks!!! I mean it!!

You're welcome man...just wanted to check, that's all :)


mdr40z;1328384 said:
the worse thing in the world you could do is to just arbitrarily adjust your fp, please take steps to analyze how your car is running and adjust/tune accordingly..... they all are different

The Lex/550 combo should be in the same FP range as stock:
Motor off, +B & Fp jumped - 33-40 psi

With the motor running:
Vac off - 33-40 psi
Vac on - 23-30 psi

Even 30 psi is at the high end of this range. Personally, I run mine with the Lex/550's at 27 psi vac on (and it still runs rich).

If you are running the stock ECU, FP should be in the above ranges. On a standalone or bigger injectors that 550, different story.