Chevycummins
Bad case of Tinkeritis!
- Joined
- Jul 15, 2008
- Messages
- 3,488
Went out to Mid-Atlantic today to run on the dyno to see what changes i would see with some timing and pop off pressure adjustment.
a couple things i did notice with the changes was the boost and egts. before at ~14* timing 178 bar injector pop off i did 411hp/791TQ with boost reaching 42 psi and egts almost peg the gauge. also there was noticeable surge in the turbo at that time also. now with the timing set at 21* by plunger depth and the injectors set at 289 bar the boost only reached 20 psi and the egts went to 1200* and stayed there.
not sure if the change in timing and pop off is the result of seeing only 20 psi instead of 42 or not. i am happy with the overal response of the truck with the higher pop. also cruise temps appear to be down a little bit also.
the timing and pop off was the only thing changed and i seen a gain of 27 HP and 17 TQ. not sure if that is just due to the timing and pop off or just different dynos. last one was on a dynacom at st joe diesel and then this one on a dynojet.
my question is more or less what your opinions are as to why i only see 20 psi now instead of 42 like before. i have checked tubes and clamps all are there and tight, and it doesnt run high egts like i have a boost leak. could my timing and pop off pressures cause that much of a difference.
also the truck is still the same as my sig just the timing and pop off of the injectors is what changed.
on a side note this is non intercooled. dyno chart is attached.
thanks :Cheer:
michael
a couple things i did notice with the changes was the boost and egts. before at ~14* timing 178 bar injector pop off i did 411hp/791TQ with boost reaching 42 psi and egts almost peg the gauge. also there was noticeable surge in the turbo at that time also. now with the timing set at 21* by plunger depth and the injectors set at 289 bar the boost only reached 20 psi and the egts went to 1200* and stayed there.
not sure if the change in timing and pop off is the result of seeing only 20 psi instead of 42 or not. i am happy with the overal response of the truck with the higher pop. also cruise temps appear to be down a little bit also.
the timing and pop off was the only thing changed and i seen a gain of 27 HP and 17 TQ. not sure if that is just due to the timing and pop off or just different dynos. last one was on a dynacom at st joe diesel and then this one on a dynojet.
my question is more or less what your opinions are as to why i only see 20 psi now instead of 42 like before. i have checked tubes and clamps all are there and tight, and it doesnt run high egts like i have a boost leak. could my timing and pop off pressures cause that much of a difference.
also the truck is still the same as my sig just the timing and pop off of the injectors is what changed.
on a side note this is non intercooled. dyno chart is attached.
thanks :Cheer:
michael
