Shift strategy idea

[907DAVE]

Interesting idea.


What kind of increments were you planning on experimenting with, 2mph, 5mph, etc?

[Pocket]

Originally Posted by 907dave

Interesting idea.


What kind of increments were you planning on experimenting with, 2mph, 5mph, etc?

I'm going to try several different ones. I'm finishing one right now that has 3 "tiers" to it. Depending on the gear, the MPH increments between them varies. Lower gears have smaller jumps, higher gears have bigger jumps.

I may change it so that higher gears have maybe an extra "tier" or two than the lower gears, since there's a much larger MPH range to play with on the higher gears.

I also don't have the jumps following the same pedal position. I learned that lesson a while back, when my trans was jumping back and forth constantly between gears as I was holding a steady speed on a level patch of road

Anyway, I haven't even road tested anything yet. Just been sitting down with the tables playing with them. I'll probably finish up a few more tomorrow morning, and burn a couple of tunes to the chip. Then head out and run some errands and see what happens.

[907DAVE]

I am excited to hear how it works.

Should make the downshift points much easier to fine tune, which (to me) seems to be way more of a challenge then upshifts.

[Pocket]

Originally Posted by 907dave

I am excited to hear how it works.

Should make the downshift points much easier to fine tune, which (to me) seems to be way more of a challenge then upshifts.

Thomas made an Excel file here (http://forum.gopowerhungry.com/minot...27-ya-hoo.html) that I'm using to help set the shift points. This is a cool little spreadsheet. Helps me to see on paper what my RPM's should be at a given speed, then I can look at my pedal position and estimate where my throttle position will be at a given point. Of course, the last step would be to hook up AE and track pedal position to verify that I'm on target.

Got a few tunes done. Time to burn the chip and test it out.

[Pocket]

Well, the shifting works. I still have a few tweaks to make, but it shouldn't be much at all. Works great driving uphill at over 6000 ft elevation.

Bad part is that I've had my truck back for less than 24 hours, and the power steering decided to puke on me I'm not sure if it's the pump, or if I blew a line. Gonna have to dive in and find out, but there's power steering fluid sprayed all over the wheel well, and dripping down the axle and driver's side suspension. This truck is really pissing me off with one thing after another breaking

Anyway, here's a quick screenshot of what I'm doing. This is the 1-2 shift, and the others look similar:



I just need to move the first jump over to the right just a bit. I don't fuel much at light pedal, and I'm having to hit the pedal a little harder, so I'm sitting at the second tier just a tad earlier in the pedal than I would like. Also I'll probably raise the first tier just a smidge, and possibly lower the second tier very slightly. Same goes for the 2-3 shift. However, the 3-4 shift is nearly dead on, and the torque converter lockup is happening almost exactly where I want it. Downshifting is also very predictable now, and happens just about where I want it.

For me, this just seems to make the trans shift points so much easier to manipulate, and helps me to make the shifts happen when I want it on the pedal. Might not look like much, but it helps me tremendously.... especially being just a novice tuner.

[907DAVE]

Glad it worked out!

I might have to try and make something similar when I get some spare time. I like the idea of having predictable, consistent shifting, which recently seems to be my biggest gripe.

Sorry to hear about the PS leak..........at least it will be an easy fix, whatever it is.

[cleatus12r]

Originally Posted by 907dave

I like the idea of having predictable, consistent shifting, which recently seems to be my biggest gripe.

Buy an OBS.