I have tuned a few of these TRD supercharged trucks now. To be honest each one was very different and the tune it needed to get it where I think it needs to be was very different.
ntinhri's truck was a special case. It was super lean. I originally tested it at a meet in MD I think last summer or fall. It was super lean then nearing 14:1 AFR at high load. How it did not blow up is amazing to me, how it made power is also amazing.
We some tuning, I could get it into the 13's but no richer. I then installed an additional injector system to attempt to get more fuel into it and it made little difference. It was clear at that point there was fuel flow problem and we installed the URD fuel pump/filter upgrade. Then there was enough fuel available to allow more tuning. After a lot of hard work we were able to get him into the 11's in AFR.
This and a few other trucks seem to have a bad lean spot right as it transitions into boost. By dialing in some fuel in the midrange we were able to bring in the part throttle midrange power and torque. This change is very noticeable and it is where you normally drive the truck.
Other trucks were very different in the tune they needed. I will admit I have been very surprised so far at the wide variations in the way these trucks run and the tune they end up needing to correct for things.
What I would like to do is to tune a truck with the TRD supercharger that does not have the TRD ECU reflash. If anyone near me wants to try that let me know. It should be interesting.
Anyway, like I said each truck is different and if you follow the U-Tune Guide you can work through the entire range and correct for most everything that is not as it should be.
Gadget