Well I have been trying out the different tunes and I'm not sure what to think. I can say that there is definatley a difference from the canned tunes, but between the 87 performance and 87 towing I can't really tell the difference. I can tell the 87 economy shifts alot sooner and softer but my milage didn't really go up compared to the other custom tunes, in fact I get my best milage with the performance tune. I haven't hooked up my boat to test the towing tune but with no load it behaves very similar to the performance tune. I was also recieving a very unusual shift from first to second when accellerating from a stop, pedal to the floor. It feels like the truck is losing fuel pressure from 2500-5000rpm and then when the shift is supposed to happen it feels like all power is lost and magically returns with a CRAZY hard shift in both the performance and towing tunes. It did not happen at all with economy tune or when returned to stock. I say it seems asthough fuel pressure is lost because it feels the same way (acceleration wise not shifting) as when the truck is reading low fuel on the info center and I punch it and the truck surges obviously from fuel moving away from the pick-up in the tank. I tried to reproduce the same situation today but could not thankfully. I think it could be related to my fuel filter not being changed for about 30,000 kms, so I am getting it changed next week.
Is it possible to get say a "build sheet" of our tunes to see what was adjusted and by how much compared to stock?
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