How sensitive is a tune?

[lasercobra]

After some discussions on other boards, I think my MAF is causing my lean condition past 6,200RPM. I'm running a '99-'00 80MM Lightning MAF at the moment and want to upgrade to a '01 90MM Lightning MAF. This is for a couple of reasons:
1. It's already calibrated for 42# injectors.
2. It's bigger then what I have.
3. Relatively cheap.

The concern I have is whether the larger opening would warrant a retune...? I can't afford that right now. :nonono:

The retune comes later with gears, new fuel pumps, and gas tank. :thumbsup:


I thought the only difference in the 80mm and 90mm MAF was size but I was told that it wouldn't peg like the current one is.

Thoughts?

 

[Quadcammer]

the maf is a large part of the tune because its all calibrated in the computer. just going to a bigger size might not cause a problem but if its no longer pegging, you will get fuel control, but if you don't retune it, you won't have any idea what its doing on the topend.

 

[lasercobra]

Got the PLX Wideband O2 scanner.

Since I'm running stock internals I better be safe and get a tune. Doing the right thing to improve a bad thing is expensive. I need a cheaper hobby....

 

[Quadcammer]

i know bro, i've done 2 retunes when i added a pump and the maf extender.

I paid 100 bux a piece, but its worth it in the end.