ir2005

I went for a couple runs to scan my car and make some adjustments to the tune. The AFR bounces between 13.9-14.7 when cruising, and goes to 10.8 at WOT. I'm not able to have the wideband logged when tuning with the version of HPT that I have. What would be a good way to go about fixing this problem?

The mods done to the car include a 2.7 pulley, headers, 3in dp, cai, stage 3 zzp h/e, and 60lb injectors.

If anyone would like to look at the scan and tune, I'm able to email them.

Thanks

AjSS

First off, this should be in the "Tuning" section... that should have been obvious.

Regardless, 13.9-14.7 at cruise isnt terrible, but 10.8 is a bit rich for WOT. The solution would be get HPT Pro so you can log AFR and tune it correctly. Who did the tune that is on it now?

Dirty25RS

13.9-14.7 oscillations at idle is normal. I dont know what you expected it to be.

10.8 is quite rich, but I've seen LSJ cobalts hit and hold 10.0.

You could get/borrow an innovate wideband and log AFR separately and find out what RPMS and loads you need to lean it out.

What AFR are you goin target at WOT?

ir2005

I made the tune, but all I did was put in the injector flow rates and offsets. I'm still learning, and that's about all I could do.

I have it set at 11.8 for WOT. I had been thinking about getting the innovate wideband but isn't there a way to wire in a wide band through your a/c or egr?

Chevycobaltss3

iTrader: (2)

first off if you can read wide band, at elast you have one. If you are not reading your wanted wot afr, this means your off in your fuel trims, log the car and change wuts needed, depending on what your tuning for ve or maf, or both. Set your dynamic airflow like so for maf tuning,400 for the first line on top and 300 for the bottom, turn off ltft, and reset fuel trims when logging, go for a drive doing stop and goes and make sure to get alot of driving, 30-45 min. there is much more to it but if you have your injector tables set up then youve started already.

ir2005

I get what you're saying and it makes sense. I'm assuming for the VE tune to disable the MAF. For the MAF tune, how do you disable the LTFT?

Thanks for the all help, I'm still new to tuning and hpt.

Chevycobaltss3

iTrader: (2)

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heres a pic i took so you can se, you need to disable ltfts by never allowing the car to go into closed loop