gonna see what ats says

[moolie]

After having the dtt twins installed i am realizing that there are some issues i need to address. I'm curious as to why my boost seems to only spike or reach it's max while in od. I also am wondering what i need to do because when i run it it wants to stay in third and stay out of od. Even at over 100 mph it doesn't wanna shift and my boost doesn't seem to peak unless we are in od. Also we are gonna look at the rail pressure on the dyno runs and see what it's doing and then make a decision on whether or not to get that aftermarket cp3. I'm sure i will but whether it's today or not is a different story

 

[nickleinonen]

I'm curious as to why my boost seems to only spike or reach it's max while in od.

boost is dependent on load, not engine or vehicle speed... in OD, there is more load on the engine

 

[KYLE4]

Moolie who is making the aftermarket CP3 ???

 

[moolie]

ats will be offering it very soon and they have dyno numbers to back it up also.

 

[AK RAM]

That is pretty normal. You will find that everyone with twins on an auto is like that. Got to get that converter locked and the engine under a good load to build 60 lbs. I can play around in town all day and only see high 40s to low 50s usually... ... maybe 55 on rare occasion. If I lock the converter though (lock-up switch) or jump on the highway and the converter locks, 60 lbs will come pretty quick. A tighter race converter would make a big difference in that as well.

 

[moolie]

i don't know what's up but they said it needed to be adjusted we had it to where we could have it in od at 2000 rpm and floor it and it wouldn't downshift that's ok i guess. However when we accellerated from a dead stop we would see like 100 mph and 1600 degrees and it wouldn't shift into od.

 

[AK RAM]

I didn't catch that part. What year is your truck? That was a problem on the earlier models and there is a PCM flash for it (TSB). Mine suffered the same thing. If I floored it, it would go to the rev limiter in 3rd and hang there until I let up on the throttle a little, then it would shift. If I stayed on the pedal, it would hang there for 7 or 8 seconds before it would finally shift. The TSB corrected it 100%. Now, as soon as it hits 3K in 3rd, it shifts.