Quote:
Originally Posted by fisherman
Jack, thank you for informatal reply! I did feel that the power really fell after about 5000 RPM, but I just loved the way it sounded beyond that! It sounds like a turbo.
So when I do get my custom tunes, which are custom-tow(87), Performance(87), and Performance(91), the shift points and firmness are already adjusted to obtain good performance and firmer yet still safe shifts ?
I thought that it was just air/fuel, and timing adjustments, then you take care of the rest to your liking.
Also, I'm just curious as to why the gryphon lets you set the parameters to these extreme levels, when its just not practical, and/or safe??  |
First, I need to apologize for the condescending tone of my last post. :o It was really uncalled for, you were asking perfectly valid questions and I let my unhappiness with the "blow everyone off the map" mentality that I see in many people get the best of me. I'm sorry. I could edit the post but I'll leave it as an example of bad manners.
Now, to your new questions: When Bill writes your custom tunes, he's going to adjust the transmission line pressure, slip and torque reduction to optimize your shifts for performance and longevity at the shift points he sets up for you. He will build in WOT shift points and the max RPM for each tune. He will also include the Tire Size and Gear Ratio information in each tune so that everything works in harmony.
He'll also set up part-throttle shift and torque converter lock/unlock points to help you realize your goals during "ordinary" driving.
And yes, he DOES set air/fuel and timing too.
All in all, there's very little YOU need to do. But, you might find, for instance as I did, that there's something about the tune that might be changed - SLIGHTLY! Here's where you have to apply judgment. I decided, for instance, that my truck seemed to eager to downshift under slight load. I felt the tune was possibly "biased" a bit more towards performance than I wanted. So, I decreased the part throttle up and downshift and torque lock/unlock points. This seems like a "safe" adjustment - in either direction.
I left the WOT shifts and max RPM alone. But, I did raise the max speed from the stock 99 mph, to 110. Why? Because if I'm passing a long line of cars on a 2-lane road, I tend to try to get around them as fast as I can. I would not want to suddenly hit the speed governor in the middle of this maneuver. I just wanted the "wiggle room", even though I never cruise above 80 mph.
Your last question is VERY hard to answer. I've often wondered much the same thing, especially since it's so hard to find any real information on safe operating limits with these trucks. They CAN be modded though, in ways that either increase their reliability under extreme stress or in ways that push the performance envelope toward those extremes. Adding a turbo and/or adding nitrous are simply two examples of pushing the performance envelope. With mods like those, you'd want higher RPM settings. There are transmission replacements that can handle such changes too. And, you could even do some major work on the engine itself let it operate safely under higher stress. That's about all I can come up with, and I know it sounds pretty weak.
Hope this helps, and, I hope your transmission gets fixed without too much strain on your wallet (and your marriage)! I've made enough expensive mistakes in the past that I know how it feels.
- Jack