tuning question

[ptlogan77]

As I stated, the truck runs at 1600 in direct.
RTLO18918B transmission.
16th gear is direct gear. the top two gears are both overdrive and are hard on the countershafts since the RTLO18918 only has journal bearings on the countershafts instead of roller bearings like the RTLO20918 has.

Direct is by far the best highway gear for transmission life because of the amount of torque required with the 3.25 rears which I agree is not the most efficient rears for the west coast.

My bread-and-butter run is 1000 miles north in BC on mostly flat roads empty one direction, so the rear gearing and running in direct works out well.

I agree that above 1500 is the best place to be, and 63 is about the max I run in Washington as the speed limit is 60.

I'm sure that the tune is less than perfect, because the higher the RPM when pulling a pass, the higher the EGT's.

The max boost is about 36-37 lbs, and since I still have the VGT turbo I have great engine braking with boost up to 38lbs on stage 3.

I'm not looking to get 7.0 mpg, as would be impossible with my "flying brick" but would like to be able to run at a higher rpm and not feel that I'm over-fueling and under-boosting, causing higher EGT's as the rpm's rise.

I will get the Inline 6 adapter and then have you walk me through copying the ECU program.

I have no issues with the head, I went through it before installation including removing the valves, checking all parts, and checking the lap with Prussian blue. I lapped all the valve seats and had the deck surfaced to ensure a perfectly flat surface.

I must say that the water temp stays down below 210 even on a hard pull, so overheating doesn't seem to be an issue.