Any feel like having a tuning discussion?

[HOKIE W/HUMMER]

CHP,
I'm really interested in your programming results, so keep the updates coming. So where would an owner search for a reputable programmer that we could trust to develop a "custom" program for our H3?
Hokie

[DURAMAX TIM]

Originally Posted by HOKIE W/HUMMER

CHP,
I'm really interested in your programming results, so keep the updates coming. So where would an owner search for a reputable programmer that we could trust to develop a "custom" program for our H3?
Hokie

do it your self?

[ChevyHighPerformance]

Originally Posted by HOKIE W/HUMMER

CHP,
I'm really interested in your programming results, so keep the updates coming. So where would an owner search for a reputable programmer that we could trust to develop a "custom" program for our H3?
Hokie

Alvin from PCMforLess is tuning the H3's now. Typically you pay a deposit for a loaner PCM (which is sent to you first) and tuning. You remove your PCM, install the loaner, and send your PCM to them to tune. Then exchange the stuff when they ship your PCM back to you.

We use the same tuning program - so they sent me one of their tunes electronically to check out. I'm going to evaluate the tune in 3 stages:

1) Look at the actual tune - what and how tables were modified,etc. - This lets you gauge how the tuner made improvments, the tuner's philospohy, etc.

2) Install the tune and run a few tanks of gas through. SOTP testing, MPG testing, etc.

3) If I have time, I'll do a before and after dyno.

I plan on posting the results here as well as how my own tune is coming along.

[DURAMAX TIM]

does HP list the history of changes made to a tune?

efi does, so even w/ different OS all I have to do is write down all the tables that are changed then cut and paste.

It is fun to play, dad wants me to tune his 99 vette now.

[ChevyHighPerformance]

Originally Posted by DURAMAX TIM

does HP list the history of changes made to a tune?

efi does, so even w/ different OS all I have to do is write down all the tables that are changed then cut and paste.

It is fun to play, dad wants me to tune his 99 vette now.

HPTuners maintains a complete history log for your file. It shows when you made the change and what you changed.

[ChevyHighPerformance]

Another update. I just added about 15 gallons of gas. The MPG was 14.7. My driving is 100% city with trips less than 5 miles and hilly roads.

Previous MPG data:

1) With the modified aftermarket air box, ported throttle body, exhaust and a couple other little things I was getting a solid 13.5 MPG.

2) I faked the Inlet Air Temperature sensor (IAT) out with a resistor and added resistance in series with the Engine Coolant Temperature sensor (ECT) to get more timing. With the resistors, I would get between 14 (mostly) to 14.5 MPG.

The resistors were removed for the latest test since I had direct program control and I didn't need to "trick" the PCM.

During this 15 gal test run:

1) I modified the shift trajectory several times part way through. So the full effect of this is not known.

2) I made many wide open throttle (WOT) runs to check on timing, knock retard, and tranny shifting. The WOT runs hurt the MPG.

3) It's been colder so I idle more in the mornings before I pull out which hurts MPG.

The results are encouraging but this is just one data point.