HPIII

Pancho · July 21, 2003

I have a HPIII and am wondering if anyone runs w 87 octance tuning? I have always used 93 but recently ran across several posts where people are saying the 8.1 runs better on 87 octane gas.

Pancho · July 24, 2003

OK maybe I should restate my question. Is anyone running the 93 octane tuning with the HPIII tuner? If so, why?

Thanks.

1BADHD · July 24, 2003

There is hardly any gain by running the 93 octane tuning. Unless you hav the cooler thermostat. I seen a dyno somewhere. That 93 octane tuning only picked up 2 rwhp. I ran the 87 tuning in my 6.0. Couldnt tell a difference.

Pancho · July 25, 2003

I have a 160 thermostat, but the HPIII for the 02 8.1 does not have a setting for thermostat. Would you run 93 with the cooler thermostat or stick with 87?

1BADHD · July 25, 2003

Well, its not going to change the timing for the cooler stat then. So I would jsut run the 87.

gmcjoe · July 25, 2003

There is hardly any gain by running the 93 octane tuning. Unless you hav the cooler thermostat. I seen a dyno somewhere. That 93 octane tuning only picked up 2 rwhp. I ran the 87 tuning in my 6.0. Couldnt tell a difference.

:word:

I ran 93 on my GMC for a while, then the gas prices hit the roof last summer. I bumped the HPP3 back down to 87 and never felt a difference