EFIDynoTuning Forum

Yeah thanks for that. The goal is to keep the transmission from shifting into second when the OD lockout switch is on. I wrote code that has replaced fn12s and now VS_SH_VAL2 and is working great except once the speed and RPM become stable something else is forcing the shift. I did not want to modify the main shift routine, but I may have to if I can't do it with calibration constants.

Think I may have found it. Will validate later today.

VS_SH_VAL2 = Minimum vehicle speed to validate an upshift to 2nd gear.

So I wrote some code that replaces fn12s with all shift points above 120MPH. It is activated by the OD selector switch. It works but as soon as I stop accelerating some other code is forcing a shift to 2nd. I have been unable to identify what is causing it to shift. I was under the impression based on the lhbh1 docs that ne12s (5500RPM) and fn12s are the only functions that control the 1-2 shift. Any ideas where else to look?

Naw too heavy. There was a 7.3 power stroke stuck in the ditch when I took this pic.

red5.0fogger wrote: ↑2024 Mar 18, 06:17
what's in the 7000lbs trailer? Can you take anything out of it?

I could remove the horses but then might as well leave the trailer behind :)

Yeah I have had those thoughts as well. 1st gear (with shift lever in drive) with the TCC locked is the next and final test before going to boost. That should be 100rpm per mph which would be on the high side of ideal. I don't really need to go faster than 40mph up these hills.

I just don't want to give up the nice 1600-1700 RPM cruise at 65mph by changing the gears.

You guys seen this? Seems like a winner for short bursts. Not sure if the motor would survive several minutes continuous.
Bench test at 11:39
https://www.youtube.com/watch?v=t-5pptoTMYM

I didn't think the tfs1 cam was a good choice for turbo

Is there any hope of a centrifugal sc doing a decent job below 3k rpm?

Https://www.ebay.com/itm/255310524650
This looks like something I can tackle with my skillset. Fabbing from scratch certainly is not.

Yeah I have one large cooler and a deep cooling pan. I've been looking at superchargers but I have to keep my smog pump to pass smog and a bunch relocate the alternator to that location. Any kit recommendations? I also thought about advancing the cam a bit more since I rarely rev past 4-5k. I installed it with icl at 108 degrees. Intake p2v was .240 when measured. Any one tried 104 or 100 icl?

Tried this today. Engine stayed cooler below 230. Transmission oil was over 260 by the time I got all the way home. That is a full 30 degrees hotter than before. She pulled up the grade fine though.