Diablosport Forums

U7140
8r36 (?)
2005 Mustang GT
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Okay, got the predator and CAI in the other day. Did the backup and loaded the C&L racer tune, there was only one that said 91 octane (no 87 or 93 octane options). I was a little worried about detonation since I had a full tank of 87 in there.

To be honest I've often had a little trouble with ping at high RPMs and WOT in the past with stock intake and tune so I was considering modifying the advance curve. But now with the new CAI the tuner was necessary.

1st question:
What do I need to change under custom tunes to allow this tune to run 87 octane? My guess is some more advance but I have no idea exactly how to allow 87 on the C&L racer tune.

2nd question:
I also saved the factory tune to the hard drive on my laptop without any problems, but it has a very cryptic file name. Can I just rename the file to "factory_default_tune" or something more friendly?

If you are running the 91 octane tune on 87 octane, pull 2-3 degrees of timing out.

Wow, thanks for the fast reply!

Do I do that across both RPM ranges?

Yes, that way the entire spark range is covered.

or....you can run out that tank of gas!!!

If your planning on using at least 91 octane fuel in the vehicle, then just leave the tune uninstalled until you put that fuel in the vehicle.

I just upgraded the crom to the 9r04 and I need to adjust for my new tires ( 295/45-18 ), I was able to calculate that to be 708.6 and was going to modify the C&L Racer tune but saw the list of tunes in there are different now.

I understand the tire revs per mile part just fine but was wondering about the new tunes.

Which of the new tunes should I use for the C&L racer, and should I keep the 2 degrees out if I prefer using the cheap gas?

Yes, if you are still using the cheaper fuel, then retard the timing by 2* and you should be fine. Choose the 91oct tune and add ~6% to the maf curve to compensate for the C&L.