Customer has a '04 Z06 that had some mods and was tuned by 3 shops, LAPD, Halltech, and A&A

Not one of them got the car running right.
Customer came to me and after the 1st pass of the tune and adding water injection we see :

-------------- Before ------------------------------------------------------------------------------- After we Tuned



All the knock and misfire gone, HP gains of 50, torque gains are 20 plus and the ills customer had of surging, bad idle gone.

The end results of all the misfires were due to vendor selling customer those high buck colored sparkplug wires that are junk. Stock ones work just fine.

Also this again shows using our water injection kit on a N/A engine does indeed increase performance.

Excellent job

Nice job!

Here a couple of things I noticed and that are maybe worth a discussion:

The new tune has a positive LTFT average of 3.55. If cell 22 is = 0 at WOT it confirms my opinion that not all cells have to be negative for having zero correction under PE.

The new duty cycle is less than the older, is it because of bigger injectors or because the WI allows a leaner mix?

The difference between O2B1S1 and O2B2S1 at WOT is about 20 mV (your tune). I have exactly the same difference at WOT but my LTFT at part throttle are pretty close. Is it ok?

The PE timing of your tune is lower than before (26.59 vs. 29.46). I was thinking the added power was because of more timing which is possible using water injection. Am I looking at the right numbers or is there another explanation?

The max G/Cyl in your tune is lower that before and you are getting more power! Is it right or only the result of a new MAF calibration?

I’m not trying to rob your tuning strategy, just want to understand a couple of things ;-)

Stefano

"IT IS CYBERSPACE MYTH THAT THE LTFTS MUST BE RICH TO HAVE PERFECT WOT. ALL THE CARS I TUNE ARE SLANTED ON THE LEAN SIDE TO MAKE USE OF THE FASTBURN HEADS AND LTFT HAS ZERO TO DO WITH WHAT PE COMMANDS FOR WOT AS LONG AS PE IS PROPERLY TUNED"

The only thing I noticed is that if cell 15 is zero or negative cell 22 (under PE!) will also be zero.

Talking cells: I don't strictly mean THE cell #15, but every single cell in the RPM vs MAP table of the #15 cell area. Especially those of the 105 KPa line.

I don't take it as a rule because I'm not 100% sure but so far it works. It's also the only thing I can do using Edit. I don't see any other way to influence LTFT during PE... unless you have another strategy