Diablosport Forums

Hi -

Just got a predator for my 2006 Dodge Durango with 5.7 Hemi.
My truck manual says 89 octane recommended, 87 ok, but not to run 91.

I understand that my truck engine is lower compression hemi, doesn't need the 91 octane.

We have three main gasolines here.
1. 87 octane
2. 89 octane with 10% ethanol
3. 91 octane premium which is 40 cents/gallon more

The predator has tunes for 87 octane, 91, and 93.

My question is why there isn't a tune for 89 octane with 10% ethanol. Runnng the premium 91 is going to cost me $10 more every tank of gas.

Thanks for anyones enlighenment in advance.

Paul

PS- does the performance tunes shut off the MDS or do I need to do that as a modify?

I found on the predator U7136 they have 89 octane tunes,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,for 300, magnum ect

U7136 Stock Vehicle Tunes:

93 Octane Performance Tune: Designed to add maximum power and torque using premium 93 octane fuel
91 Octane Performance Tune: Designed to add maximum power and torque using premium 91 octane fuel
89 Octane Performance Tune: Designed to add maximum power and torque using 89 octane fuel

the tunes are basically the difference in the timing added over stock. the higher octane fuel you run the more timing you can run without it pinging....more timing= more power