I'm using my XCAL to adjust my shift points and noticed an issue. with my shift scheduling set up like it is in the pic, at damn near coasting (almost no throttle) I shift 1-2 at 22, 2-3 at 34, and 3-4 at 48.

Now when I look at that chart, I'm not even using the entire left half of the graph. So does anyone know what TP stands for, cause I think mine is way too high.

 

here is my current shift scheduling

 

TP= Throttle position.

 

throttle position??? that doesn't make any sense unless my tp sensor is waaay out of range.

I'm gonna explain my original problem then. With the OE shift scheduling my car wouldn't shift into 2nd until >3k rpm's rolling downhill. It's done this ever since I put a 5.4 LB and 02 f250 4r70w in it. I converted from a v6 so I'm not certain any of the sensors are good.

I'm gonna check my TPS voltage next then. Does anyone know what it should read? Also looking for suggestions on what should be done, I'm just shooting in the dark here.

I'll include an OE shift schedule for comparison to the one I made for it.

 

TP sensor voltage should be right at .95-.98v closed and 5v at WOT. You can check it with a VOM with the engine off and key on. Use a straight pin into the signal wire to get the reading.

Here's a link that will help: http://www.muscularmustangs.com/tps.php
Testing info for modulars is at the bottom. A quick google search returns lots of pages with details specific to adjusting the TPS on modulars. I have a spare TPS laying around. If you would like to have it for a backup in case yours is hosed PM me and we'll work out the shipping. It's from an FRPP 70mm TB.

As for the shift scheduling, since you're using the Xcal to adjust the shifts, I'm going to assume that you're not using the Advantage software to make the base tunes. I don't know what base tune you're using so it's hard to make any good guesses to a solution. I would suggest calling up Rick at Amazon Racing and having him set you up with a tune that's optimized for the increased tq. If you've had a chance to get it on a dyno I'd send him the graph so he'll understand the nature of the tq curve.

 

I'm at 1.01 closed and 4.66 WOT. I'll adjust it down, but that doesn't seem to be enough to cause that kind of shifting.

I'm not using the advantage software, I'm using Extreme Tune. Shifting is the same with the OE tune and the one I bought from VMP (which is supposed to be optimized for the increased torque). If it would help, I could email the tune I'm using.

 

please do... cburnss at gmail dawt cawm.

That far off across the scale is a relatively minor but still very real issue. It's between 3-6% off across the scale which is enough to mess it up. You're never really at idle and never really at WOT (only about 94% of WOT as far as the computer is concerned).

Start by adjusting the TPS and sending me your tune. If it's a problem we can't figure out then I'm sure VMP can help us out getting your tune right.

 

Tune sent, i'm adjusting TPS now. Thanks!

 

I think I found a bigger problem. The output voltage on the TPS is bouncing around when the car is running. At idle, it's bouncing between .97 and 1.1. (it's 9.4V KOEO). I checked the 5V lead and it's bouncing too between 5.08-5.2 (it's 5.04V KOEO).

Can anyone confirm this as a problem?

 

That's not good... are all the grounds and hot lines secure?

LMK if you want my spare TPS. Cost of shipping + you owe me a favor.

 

Wait, didn't the F-250 Super Duty have the Torqshift trans/a different 4 speed trans? If that's the case, those trans have a tow/haul mode that leaves the trans in gear longer and downshifts when you hit the brakes.

 

I have another TPS I'm gonna put in it ( I have a couple TB's with them lying around). But I'm assuming that won't fix the fluctuating 5V system.
I'm going to check the wiring diagrams, but I think that goes straight to the ECM and is a sign of a bad ECM. I'll have to go through every power and ground lead first to be certain though (yay).
I have a spare ecm, but I don't want it to come to that.

Bassman- Is that Torqueshift trans a 4r70w? I know it's definitely a 4r70w cause it looked fairly identical to the v6 4r70w (some sensors were different).

 

No, the Torqshift is the 5 speed trans in the Super Duty trucks (250-550) and before then, they had a 4 speed, which wasn't the 4R70W. Otherwise, if it is a 4R70W, that didn't come from a 250 but a 150 (unless it came from the old non-Super Duty 250 which ended production before 02 some time).

 

ok, I wasn't sure but the trans is definitely a 4r70w.