I have 2 TAC modules with 12573059. With the big throw, non-adjustable pedal, I get 100% WOT at 50% (or so...) of pedal travel.

All ebay auctions I've looked at say that 12588923 superceeds 12573059.... I need to make mine work! --

 

So, now that I've had more time to think about it:

if 12573059 and 12588923 are indeed the same, I should be able to change my OS to 12587811 and my current TAC and pedal should work.

I'm still hesitant to change OS's at this point with the other custom work I've had done to it. I guess it's time to check compatibility of segment swapping my AC changes and weather or not an EFILive COS3 is available for 12587811

Edit: No COS3 for 12587811. Damn.

 

Well, as a follow-up.. I've been driving the new swap car for about a month now, and I'm worried about my clutch life. If I can concentrate heavily on extremely lightly feathering my gas pedal, all goes well. But if I'm trying to get up and go in a hurry, My gas pedal foot tends to bump the throttle a bit more heavily.. Not good for the clutch!!!

So, as a hopeful work-around, I observed TP% while doing what I consider "bumping" the throttle while pulling out, and TP% goes up to usually about 50% in what I consider normal pedal actuation. Seems a bit aggressive to me

So, I started messing with B2308 "ETC pedal response"

Stock values from 12.50% to 50% pedal go like this, along with my 50% reduction:

pedal % - Throttle % (stock) - Throttle % (with my modifications)
12.5 - .381 - .190
15.63 - .586 - .293
18.75 - .947 - .474
21.88 - 1.377 - .688
25.00 - 1.895 - .947
28.13 - 2.539 - 1.270
31.25 - 3.389 - 1.694
34.38 - 5.703 - 2.852
37.50 - 7.5 - 3.750
40.63 - 9.6 - 4.8
43.75 - 12.002 - 6.001
46.88 - 14.502 - 7.251
50.00 - 16.904 - 8.452

After multiplying the values up to 50% by 1/2, I added a sharp curve from 50% up to 100%.

I realize that by doing this, I've lost some pedal granularity above 50% throttle movement, but in reality, it's pretty rare I'm looking for pedal control/granularity above half throttle anyway.

In the driveway, the pedal feels MUCH more reasonable now, and I might have taken away too much, but I'll have to reserve that judgement until I do some driving.

I have my fingers crossed that the modifications don't trigger a limp mode or fry my PCM (as warned about in the editor...) but I'll have my laptop and a backup file on hand in the event that it does.


Wow, what a difference it makes in overall low-speed/throttle driveablitiy!!! It's totally tamed the stabby throttle issue and pulling out isn't such a teeth clenched operation anymore. I haven't verified that I'm still getting 100% WOT on the butterfly, but I can't see why any of these mods would have stopped that from happening.

Give it a try if you're tired of an ultra-touchy throttle because you have pedal/tac/software mismatch issues.

 

Jim,

Good work. i'm definitely filing this data away.

i would possibly guess that your engine/tune/pedal/tac, etc. came from an automatic trans car and now you are using it with a manual? you probably mentioned in a previous post, just too lazy to go back.

 

I didn't personally pull any of the test pieces I've used, so I can't confirm where any of them really came from. Everything I've used was supposedly from an auto truck though. And yes, I now have a manual trans.

I've come across a theory that it's the throttle body that dictates which pedal and tac is compatible. Some TB's want 0-5v, some want 0-2.5. However, the bottom line is that there are way too many inconsistencies to draw a conclusion about anything.

It has been reason enough for me to not bother swapping pieces around hoping to get the magical combination of everything