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Retuning the fuel maps after rewiring the fuel pump - how much fuel to pull?

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Retuning the fuel maps after rewiring the fuel pump - how much fuel to pull?

Old 07-28-13, 08:16 AM
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Retuning the fuel maps after rewiring the fuel pump - how much fuel to pull?

So I rewired my fuel pump and now the AFRs are in the 11.5 range and the cars stinks like gas badly. I am going to slowly start pulling fuel out around idle but wanted some general help so I don't over do it or make it harder for myself.

I was originally thinking about trimming fuel from the vacuum range under 1500 rpms but not sure exactly.

And what is a realistic amount of correction to get the AFRs back up to a normal range, and what AFR should I shoot for at idle?

Thanks very much!
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Old 07-29-13, 03:51 PM
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Anybody run a rewired fuel pump with the Rtek?

Is it easier to just use the variable resistor function or should I be tuning the fuel tables?
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Old 08-22-13, 08:05 AM
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sounds like your fuel pressure regulator is being overrun. i usually shoot for 12.5 to 13.0 AFR at idle
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Old 03-11-14, 12:01 PM
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I just installed my 2.1 this past weekend and I have a rewired walbro 255 and I'm getting 11.5 AFR at idle as well...did you get this figured it?
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Old 03-11-14, 12:03 PM
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As mentioned get an aftermarket fuel pressure regulator that can keep pressure correct at the higher flow rates.

Don't go tuning the afrs to match fuel pressure creep.
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Old 03-11-14, 12:21 PM
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Ah, thank you. I didn't see where it was recommended to get a new FPR.
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Old 03-11-14, 12:27 PM
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Also, I rewired my pump 8 months ago and my AFRs were in the 13s at idle. I just installed the rtek and 720 secondaries this weekend. Now 11.5
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Old 03-11-14, 12:44 PM
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Did you setup the injector settings to 550x720?
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Old 03-11-14, 12:51 PM
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Yes I did
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Old 03-11-14, 02:29 PM
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Did you go through the idle setup procedure where you can adjust the 'var-res'?
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Old 03-11-14, 10:31 PM
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Originally Posted by Nick_d_TII View Post
Did you go through the idle setup procedure where you can adjust the 'var-res'?
Yes, sir! I just noticed today that when I modulate the varres my AFRs drop!
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