Originally Posted by
steve05ram360
Yes, the goal with that method is to get the timing right for the fuel & air given. Its best to do it at speed and monitor the calc load across the same stretch of road. Even better if a hilly route can be taken at the legal speed limit. I use this technique locally and it gives excellent results. However its only at 1 rpm/speed, once the timing is dialed in I push those numbers up and out to the 2500 rpm range.
I have also recently concluded that on the '05 piston design I cant get away with dropping cruising RP past ~10.8-11.2k. When dropping it further mpg dropped and stagnated regardless of what was done to the tune. Took a step back to a higher RP tune that gave great results and mpg popped back up.
On pilot... I cant log timing and have had issues getting good results. gave up on messing with it. HP tuners ticket died with the lockdowns.
On post... I still have it in play but it is only in a section of the tune used while accelerating and its primary function is to get the turbo spooling.
FWIW, I've averaged 21.0x mpg over the last 35k miles. Cant complain about that at all. Max was a 25.0x, 5 in the 23's, bunches in the 22's. Tanks is vented so fillups are up to the neck with ease and tanks are always hand calculated.
Ah, forgot to add... if your gonna be doing 80+, consider a 2nd air dam under the front swaybar (assuming 4wd) to help deflect airflow down past the axle. my truck managed 19.5 mpg doing 85ish thru Idaho with it and 18.5 a year later without the airdam
.