Curt, I can run any octane with the 5 degree advance. I have experimented with 87, 89, and 92, and there is absolutley no pinging to be heard. (notice i say heard)
Ron, these are not the typical LA engines, the 4.7L has some seriuos timing retard from the factory, it will take 5 degrees easy, and I feel like it will take even more running 92 only!! I can run 87 octane all day, hot weather with no problem!!
I sent my original PCM to Leach, I'm not sure if a new PCM will work or not?? You'd need to get the dealer to flash in the VIN just like you would with a Mopar unit if you can use a new PCM.
Thats the advantage to having your factory unit programmed.Your VIN, and mileage stay in there. If you are not satisfied with Leach's work, they'll put it back stock and refund your money. I may send mine back and get more advance.
Matt Y2K-HEMI
In a message dated Wed, 28 Feb 2001 2:59:39 PM Eastern Standard Time, "Curt Coulter" <curt@cjnetworking.com> writes:
<< What octane is that requiring you to run Matt? Do you know if it's possible
to pick up a new PCM to have programmed so it could be swapped back and
forth with the stock PCM, or does the required VIN (etc?) flash not allow
for that kind of swapping?
Thanks.
/Curt
Chelsea, MI
> Don't wait for Mopar, call Mike Leach, he writes the software for
> Mopar! The Mopar PCM will have 5 degrees advanced timing, and
> thats what Mike did to my PCM, there is more advance to be had,
> Leach can put as much in there as you want! I wish I had asked
> for more advance.
>
> Mike Leach & CO
> 1443 West Collins Avenue, Orange, CA 92867
> (714) 639-5220
>
> Matt Y2K-HEMI
> '00 RC 4.7L 5 spd
> 14.23 @ 94.49
>
>>
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