Diablosport Forums

HI! to all
will this be to much octane with the hemifever 91 octane tune
Thanks.

Nope. Its just enough.

Interesting........ I may have to try some MotorSport 109.

Motor Octane 101
Research Octane: 109
R+M/2: 105

Thanks for the reply.
But do I need to do some any little change in the 91 Hemifever tune or just leave it has is!
Thanks.

grizzly660 wrote:Thanks for the reply.
But do I need to do some any little change in the 91 Hemifever tune or just leave it has is!
Thanks.

You should be able to leave it. Of course, you won't see any power gains unless its knocking on 91 and the 100 octane eliminates the knock.

dlayne2012 wrote:Interesting........ I may have to try some MotorSport 109.

Motor Octane 101
Research Octane: 109
R+M/2: 105

Is that unleaded? If its leaded it will destroy the cats, if you still have them, and the O2 sensors. If its unleaded, I'd have no issue running it on a built Hemi.

Yeah it's unleaded. What about a built 4.7

http://www.vpracingfuels.com/vp-drag-racing

dlayne2012 wrote:Yeah it's unleaded. What about a built 4.7

http://www.vpracingfuels.com/vp-drag-racing

Don't really know enough about the 4.7 to say for sure. I would think it would be okay, but theres always the chance that it could have problems igniting and cause drivability problems when not under heavy load.

Was the 4.7 ever offered in a Flex Fuel version? If it was then theres a better chance that it would run good on the higher octane. E85 is very high octane, so if it can run on that, it can run on high octane unleaded too.

Yes my 4.7 is the flex fuel engine.

Yes it is unleaded! But right now I am running with the 89 Hemifever tune with 91 octane but I am looking forward to the 91 Hemifever tune with the 100 octane. Because Sean told me it was better to run 91 octane with the 89 tune for now and get better fuel for is 91 tune.