Diablo tune or ????????

[ROCKET1195]

I have a stock gto with a cai and a variam with a maf ports, I have a diablo tune witch I ran a 13.3 in the 1/4 on street tires. I found a tune on this site and found it wasn't better than the diablo tune. any help? I don't want to damage the engine, any experts out there? don't known what is correct. Any help would be great, Thanks Ron

[LS2Tuner]

Yeah you need to drive on the freeway for a 10-15 mile drive cycle with the cruise on @ at least 2000 rpm and then monitor/log your LT Fuel Trims. You want to be in the area of 1- -1. Look at that data and post your results. Remember the throttle has to be steady as in NO changes thats why it's best to have the cruise on.

[ROCKET1195]

Thanks for the info, but I have trouble still. I will try what you said but know I have a trouble with a trouble code. I just added the ports to the maf, and the vairam to the throdle body. I di put nascar tune in and it didn't seem to be any better, as I said before, so I have the diablo tune in now and I have to say the car does run good. I found that I had a trouble code for ( bank 1, two lean.) so I cleared it and and drove around 12 miles with the cruise on and set for 60. to see if the mpg was still good, witch at 60 I was avg. around 28. not bad. so I'm looking for help with this code, should I take the ports out? or the vairam?, will this hurt the engine? and also with both tunes my long term showed around 15.4 to 17.4. where do you get a crash course on tunes? Thanks for the help Ron

[Madbar]

k, if positive ltfts - yes you're lean... so you adjust your slope negative to richen that up... changing the injector slope changes how much fuel is sprayed - in BOTH normal driving AND PE/WOT... now, it says to lean out the PE fuel tables by the same amount - because you just richened it up by adjusting your injector slope.
PE/WOT fueling adjustment works the OPPOSITE of the injector slope adjustments....

for injector slope - going negative (left) makes you richer. going positive (right) makes you leaner.

for PE/WOT fueling - going negative (left) makes you leaner (taking away fuel from WOT). going positive (right) makes you richer (adding fuel to WOT).

Info By 06MonteSS
THis was a question I had a day or so ago, & I'd thought I'd pass it to you.......I hope Monte didn't mind.
Your LTFTs seem alot like mine, almost the same. I went to injector slope & went -14, & did the like -12 on the fuel lean & it dialed my LTFTs right in.
Plus, I disabled my rear O2s for LTs, if ya have em.
good luck