Did you drive your truck DPF deleted with the stock turbo at all? When you say "downshifting has gone away completely", you talking about while towing, not towing, both? What rpm are you turning running down the highway? Is it smoking at all while on the hills and holding the gear? How steep are the hills? I don't have any big hills but a lot of little steep hills around me. I don't tow much but I hate hunting of the transmission and I'll probably be going up to 37s on 3.55 gears when I put my lift kit on this coming week. Glad too see the progress with the Street Max and Morgan's pump! Keep us updated.
all good questions.
So I towed stock, DPF on tuned, and then with this set up. I never did tow with a DPF delete tune on a stock turbo. But from what I have seen and heard the gains of DPF off and on are minute in the grand scheme of things.
Downshifting while towing is in particular what I was talking about. Typically I tow at about 73-75 mph with my camper, slower in some spots jus depends on wind and road conditions. RPM is 1700 while towing. I never did run into any hill where the truck downshifted on its own, all manual induced because I knew the grades were very long in distance. Typical grades around here are 6-7% some short 1/4 mile runs others 5-6 mile runs. The 1/4 mile 1/2 mile runs I just let the truck do its thing. There is absolutely no smoke. I have spend extensive amounts of time with the tuning to make sure that it never smokes, even right from a stop light, downshifting ect. Its been hard to do but I have the thing very very clean running.
My truck is 3.55s and 33s. so I will venture to say that at same speeds with same gears and 37s you are going to be in 5th gear a fair amount of the time if you tow anything close to 10k weight wise.
If I slow down to 67mph or so I generally kick it out of 6th gear, it will hunt a bit because the rpm is about 1400, it will pull decent hills but I down shift it to keep it in 1 gear. 5th gear around 67mph is just at 2000 rpm and it really likes that rpm, pulls hard up any grade like that.
The truck will still need to downshift while cruising ect to pass sometimes just because I have the trans strategy similar to factory to find the highest gear. I did modify the transmission tables to help with this and also make the transmission downshift a little easier from some gears at low rpm. I don't feel like my transmission hunts for gears, downshifts too much or lugs to hard. basically when you hit the throttle you expect what the transmission will do.
Super happy with the complete set up 6.7s are a game changer for towing and these parts have helped it even further. I drove the truck almost 2 full years completely stock and was pretty happy with the performance. In the past I have made some bad decisions on set ups that weren't really tested. I text morgan the other day and thanked him for the turbo and how well it works and getting the right product the first time. I was a little nervous about a 64mm towing at my altitude but it meets and exceeds my expectations.
Another side note is my oil samples have come back good with the addition to these parts, Soot is actually down from stock which shows that its probably cleaner running than it was from the factory (dpf masks the smoke output) All wear metals look good and so do the additives.
Just as a side note all of this towing was done between 5-8000 feet of altitude. that says a lot about this turbo, at sea level I bet its even better.
oke: lol
