c5 corvette tuning question
c5 corvette tuning question Recently I spent good money on a custom dyno tune from a shop for my h/c/I corvette.
The other day just for the hell of it, I hooked my handheld diablo to the car as I drove and decided to monitor my driving conditions. I did notice that my LTFTs were in the -12 to -10 range. Should I trust his judgement and leave it be, or should I adjust the pe ratio myself and bring it up to the -2 to 0. Range? I remember seeing on diablo tuning that almost 0 is best, but the tuner used hp tuners so I assume that the diablo is not as accurate?
The other day just for the hell of it, I hooked my handheld diablo to the car as I drove and decided to monitor my driving conditions. I did notice that my LTFTs were in the -12 to -10 range. Should I trust his judgement and leave it be, or should I adjust the pe ratio myself and bring it up to the -2 to 0. Range? I remember seeing on diablo tuning that almost 0 is best, but the tuner used hp tuners so I assume that the diablo is not as accurate?
The scanner function of your Pred should be fine as far as accuracy.
Adjusting the PE ratio won't change your closed loop fueling.
The FTs should be a bit closer, but if it's running OK, I don't know if I'd bother with it. If you're that concerned, how bout contacting your tuner and asking him about it, and see if he can't dial them in a bit closer.
Adjusting the PE ratio won't change your closed loop fueling.
The FTs should be a bit closer, but if it's running OK, I don't know if I'd bother with it. If you're that concerned, how bout contacting your tuner and asking him about it, and see if he can't dial them in a bit closer.
Yea, long tubes, cam, ported heads and vararam intake..... the -12 ltfts were concerning me because I was wondering id I was just wasting fuel while commuting because I know my gas milage suffered since the tune. My tuners kind of an *** and I really want to avaoid going back there as a few other tweaks and code diabling I had to go over and do on my own.
I adjusted my injector slope to bring the ltfts more evenly....
I adjusted my injector slope to bring the ltfts more evenly....
Last edited by venom346; Dec 28, 2010 at 06:29 PM.
Recently I spent good money on a custom dyno tune from a shop for my h/c/I corvette.
The other day just for the hell of it, I hooked my handheld diablo to the car as I drove and decided to monitor my driving conditions. I did notice that my LTFTs were in the -12 to -10 range. Should I trust his judgement and leave it be, or should I adjust the pe ratio myself and bring it up to the -2 to 0. Range? I remember seeing on diablo tuning that almost 0 is best, but the tuner used hp tuners so I assume that the diablo is not as accurate?
The other day just for the hell of it, I hooked my handheld diablo to the car as I drove and decided to monitor my driving conditions. I did notice that my LTFTs were in the -12 to -10 range. Should I trust his judgement and leave it be, or should I adjust the pe ratio myself and bring it up to the -2 to 0. Range? I remember seeing on diablo tuning that almost 0 is best, but the tuner used hp tuners so I assume that the diablo is not as accurate?
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Yea, long tubes, cam, ported heads and vararam intake..... the -12 ltfts were concerning me because I was wondering id I was just wasting fuel while commuting because I know my gas milage suffered since the tune. My tuners kind of an *** and I really want to avaoid going back there as a few other tweaks and code diabling I had to go over and do on my own.
I adjusted my injector slope to bring the ltfts more evenly....
I adjusted my injector slope to bring the ltfts more evenly....
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I would expect it to be closer myself. If your injectors are stock then leave them alone. You should dial the trims in with the maf or VE table depending on if you run an SD or MAF tune.
