Ya-Hoo!

[Pocket]

Keep us updated. I'm interested to hear the results.

I've got dual HPOP's on my truck, and I get an RPM drop when I come to a stop. It's worse on a stock tune or lower HP tune than it is on a racing or performance tune. I've done some tweaking and got it so that it doesn't happen often, but every now and again I can watch those RPM's dip for a split second when I come to a light or stop sign. Still trying to figure out how to completely get rid of it.

[F-127]

I always get excited when there is something to read in this section of the PHP forum, so I figured its my turn again. I finally got the courage a few weeks back to take out the chip that came with the truck and run with my own. They were good tunes, but I was just driving "dead to the world" in terms of paying attention to what was going on with the old chip. I tried to note things that I liked and disliked, but it was hard knowing that I couldn't do a dern thing about it. So, I busted out that last blank chip (reorder may be coming soon lol) and slapped it in. Engine side of things is about 95% ironed out. I only seem to have a defueling issue at higher boost pressures with no 'boost fooler' in the MAP line and also because I left the 'adder to pulsewidth multiplier' map alone.

Now, onto the transmission side. I'll likely be going back to re-read about every thread in this section dealing with shifting. I always tried to follow along but found it hard to do with no auto trans of my own to tune for. Here's an FYI that there might be future questions from me for shifting questions!

[cleatus12r]

Just keep in mind that the OBS transmission functions are infinitely better than the SD trucks because they are so simple.

The SD PCMs are complicated enough that there are TONS of things that affect when/how the transmission shifts. The OBS computers have a tendency to do what you want them to do.....consistently.

[F-127]

Well after making my first street race tune and failing somewhat miserably by making very crude estimates on shifts (shift points were a wittle higher than I wanted), I decided I would come up with a handy spreadsheet so I could nail my shift points down more precisely, making a fine art of shifting (hopefully someday lol). So, I'm going to attach the file. Haven't got the fancy or pretty extras, but it takes care of business. Version 2 of the street race tune is soon to be completed, gonna be fun. Taking care of a number of issues, one being that "double bumping early locking garbage" as it has been put before.

[cleatus12r]

Now THAT is cool.

I wish I had some Excel skills. "You know, like numchuck skills, bow hunting skills, computer hacking skills... Girls only want boyfriends who have great skills."

[F-127]

Question time. So here I am comparing between files SD shifting and the OBS shifting parameters and I came across TV maximum for the different shifts. The SD TV max for 1-2 is a whopping 40psi higher than the OBS, which was 47. SD max for 2-3 is over double, and 3-4 is 39 psi higher. Bumping up the indicated torque just slightly and using the TV slope and offset I'd be hitting the max fairly quick. Is there any reason I couldn't use the SD values for the maximums? Maybe the higher max was to allow for adaptive shifting, which I think I read could change up to 20 psi?

[907DAVE]

Pretty sure that the adaptive stuff can do up to 30 psi, as far as the reason for the differences between the two I couldn't tell ya.