How about a transmission tuning tutorial!

Quote:

---

Originally Posted by mtnman

Is there any way to adjust shift firmness during AutoVE tuning? My shifts are freakishly hard and jerky.

---

Make sure that P0101, P0102, P0103 are disabled in these tables:

E0101, E0102, E0103, E0104

edit: and check for any instances of P0101, P0102, P0103 in any Exxxx tables.

(they don't appear in all these tables)

Quote:

---

Originally Posted by joecar

Let's play with the numbers...

416 * 1.356 = 564
416 / 1.356 = 307

Hmmm... it would appear that EFILive is dividing instead of multiplying to get the torque numbers.

---

Also "broken" is GM.TFMPRS (psi is ok, but kPa is wrong).
Both will be fixed in the next release.

Paul

Quote:

---

Originally Posted by Blacky

Also "broken" is GM.TFMPRS (psi is ok, but kPa is wrong).
Both will be fixed in the next release.

Paul

---

Paul, thanks mate, excellent customer service. :cheers:

Quote:

---

Originally Posted by Flyer

Joecar
My car is changing gears nicely now - but the 2-3 change at lower 1/3 Nm values is a bit clunky - what can i do about it? My LSD/diff is a bit worn i think as well so it might be a factor.

At high % its fine. But low down it is a little bit bangy rather than positive and quick like the 1-2 change.

I have no torque management set at all and remember i have a SS3600 converter

---

I experimented a little, and I found that I can eliminate the clunk most of the time if I revert back to stock the lower portion (TPS < 25%) of the PT 2-3 upshift table D0902 and the PT 3-2 downshift table D0907. It still happens, but less frequently and less pronounced when it does.

I spend about 30 minutes/day in 0-25MPH stop/go conditions (freeway traffic jam) so I get good opportunities to test this out.

So I don't know if your tables are modified, if they are you may want to try this.

Well, thanks for the help you guys provided me without even knowing it. My 02 TrailBlazer with Transgo HD-2 shift searches for gears on the hwy and above about 45mph, but after reading this thread I have some ideas that I am going to try tomorrow and see what happens!!

Quote:

---

Originally Posted by ScarabEpic22

Well, thanks for the help you guys provided me without even knowing it. My 02 TrailBlazer with Transgo HD-2 shift searches for gears on the hwy and above about 45mph, but after reading this thread I have some ideas that I am going to try tomorrow and see what happens!!

---

Let us know how it goes/went... :cheers:

Hi there guys.
Did my first trans tune on a VYII Holden R8. Interesting experience with very good results!
The trans had the usual clunky down shift and slow sloppy upshift under hard acceleration. It also had that annoying TTC lockup in 4th gear that won't unlock when you hit a decent hill unless you really stab the throttle or pass 50% TPS or more. This means you are always reaching for the manual change to 3rd or suffer in silence and slooooowwww down:)
What amazed me was how different the car was to drive once we "got it right" !
The Upshifts were snappy yet not jerky giving a performance feel, the downshifts on light throttle were almost imperseivable, the TTC was hardly noticible on lockup.
And best of all, the moment you hit a hill and needed a bit more grunt the TTC unlocked at about 40% tps (standard about 52%) and away you went. The customer was very impressed :) and so was I.
Thanks for all the good info and tuning tips on this thread !

Mike

Quote:

---

Originally Posted by The Alchemist

And best of all, the moment you hit a hill and needed a bit more grunt the TTC unlocked at about 40% tps (standard about 52%) and away you went.

---

what exactly had an impact on this?
thanks!

This is a old thread.....:cucumber::cucumber:

Quote:

---

Originally Posted by Superado

what exactly had an impact on this?
thanks!

---

TCC unlock in 4th gear vs TPS...can't remember the "B" series number.
Works a treat.
Mike