Pocket
Tue, May 18th, 2010, 09:27 PM
I've been working for a little while on a new tune that I've been wanting to try out. My goal was a tune that would make at least 325 rwhp on stock injectors that can be used as a daily driver. Another goal for the tune was to be able to tow over mountain passes without EGT's getting too high, and to have almost no smoke. I've tried towing in other race tunes before, and EGT's and smoke just haven't been manageable when climbing mountain passes, forcing me to switch to a lower HP setting. So I wanted to see if I could change that. Kind of an experiment and personal goal I have to see what I could learn.
This weekend I drove from Denver to Houston and back towing a cargo trailer. Nothing too heavy or outrageous, but a nice first test to really stretch out the legs on the truck and see what the tune is capable of. There's really only one mountain pass on the trip at the Colorado/New Mexico border (Raton pass), that has somewhere between a 6-8% grade going up. The trailer loaded down probably topped only 5000 lbs, so nothing major. However, going over the pass there was no smoke, and EGT's topped out at 1100 degrees on the steepest part of the climb. :happy-dancing:
My wife and brother-in-law were on the trip, and they also drove the truck. They liked how it drove and had no complaints about the shifting, pedal sensitivity, etc. So overall I think I've made huge strides. The truck accelerates almost like my old 140hp race tune, so it's got some power. At altitude I can hit 30 psi, and in Houston at sea-level I hit 32 psi of boost at WOT. Not bad for stock injectors and a 38R.
Mileage also was pretty good. Going down we were averaging about 85 mph, and was getting between 12-13 mpg. Coming back we had a piano in the trailer and some other delicate items, so we took it easier and drove much slower. Made it from Houston to Abilene with a 1/4 tank to spare, getting a little over 14 mpg. So towing mileage is right in line with other towing tunes for the speed and weight I'm pulling.
Overall it feels really good. The pedal is not touchy at all. I did a lot of revamping the MFD table (thanks Cody for all your help!). I've also done a lot of experimenting with the low boost fueling tables that have surprisingly worked extremely well, as well as playing with the ICP. I still have a little more tweaking to do with the ICP, the downshifting, and tweaking of the torque converter lockup points in 3rd gear. But I think the fueling on the bottom end is almost perfect. There's not much smoke at all when I hammer it from a dead stop, yet it still spools the turbo lightning quick.
I'm really happy with the progress, to have the power of a race tune, but tweaked so that it can be used as a very mild daily driver and towing tune. I even got it so that the cruise control works very well, and it's not lurching or jumping around when climbing hills. The only lurching I felt was when I hit a thunderstorm heading back between Dumas and Dalhart, TX. The wind was insane, and just to maintain 70 mph my truck was pushing 20 psi of boost driving straight into the wind. Only then I felt the cruise control get jumpy to maintain speed, so I had to kill it at that time.
Again, another big thanks to Bill and Corey. I've really enjoyed the Minotaur software and finally have my tuning customized the way I like it. :D Next step is to finalize the few tweaks and hit the dyno to see exactly what power it puts to the ground, and take it to the track and see what times it will run. I am stoked!!!! :woot:
Now to fix this pesky oil leak that keeps randomly popping up :cursin:
This weekend I drove from Denver to Houston and back towing a cargo trailer. Nothing too heavy or outrageous, but a nice first test to really stretch out the legs on the truck and see what the tune is capable of. There's really only one mountain pass on the trip at the Colorado/New Mexico border (Raton pass), that has somewhere between a 6-8% grade going up. The trailer loaded down probably topped only 5000 lbs, so nothing major. However, going over the pass there was no smoke, and EGT's topped out at 1100 degrees on the steepest part of the climb. :happy-dancing:
My wife and brother-in-law were on the trip, and they also drove the truck. They liked how it drove and had no complaints about the shifting, pedal sensitivity, etc. So overall I think I've made huge strides. The truck accelerates almost like my old 140hp race tune, so it's got some power. At altitude I can hit 30 psi, and in Houston at sea-level I hit 32 psi of boost at WOT. Not bad for stock injectors and a 38R.
Mileage also was pretty good. Going down we were averaging about 85 mph, and was getting between 12-13 mpg. Coming back we had a piano in the trailer and some other delicate items, so we took it easier and drove much slower. Made it from Houston to Abilene with a 1/4 tank to spare, getting a little over 14 mpg. So towing mileage is right in line with other towing tunes for the speed and weight I'm pulling.
Overall it feels really good. The pedal is not touchy at all. I did a lot of revamping the MFD table (thanks Cody for all your help!). I've also done a lot of experimenting with the low boost fueling tables that have surprisingly worked extremely well, as well as playing with the ICP. I still have a little more tweaking to do with the ICP, the downshifting, and tweaking of the torque converter lockup points in 3rd gear. But I think the fueling on the bottom end is almost perfect. There's not much smoke at all when I hammer it from a dead stop, yet it still spools the turbo lightning quick.
I'm really happy with the progress, to have the power of a race tune, but tweaked so that it can be used as a very mild daily driver and towing tune. I even got it so that the cruise control works very well, and it's not lurching or jumping around when climbing hills. The only lurching I felt was when I hit a thunderstorm heading back between Dumas and Dalhart, TX. The wind was insane, and just to maintain 70 mph my truck was pushing 20 psi of boost driving straight into the wind. Only then I felt the cruise control get jumpy to maintain speed, so I had to kill it at that time.
Again, another big thanks to Bill and Corey. I've really enjoyed the Minotaur software and finally have my tuning customized the way I like it. :D Next step is to finalize the few tweaks and hit the dyno to see exactly what power it puts to the ground, and take it to the track and see what times it will run. I am stoked!!!! :woot:
Now to fix this pesky oil leak that keeps randomly popping up :cursin: