Tiptronic strange behaviour after remapping

by **gdepre** » Fri Nov 22, 2013 9:10 pm

Hi !

I just remapped my car with help of djbalkanac that I thank a lot.

Since the remap, I've got a strange thing with my gearbox (tiptronic on a VW Passat V6 TDI). Manual mode, no kickdown, when I'm at a speed of 120km/h (2200t/min), the gearbox goes back to 4th gear, and 3rd gear while throttle is 100%. If I put throttle at about 50%, averything is ok, the car is accelerating normally, staying in the 5th gear.

What could be wrong ?

Regards,

gdepre

by **JoaoFerro** » Sat Nov 23, 2013 1:31 am

gdepre wrote:Hi !

I just remapped my car with help of djbalkanac that I thank a lot.

Since the remap, I've got a strange thing with my gearbox (tiptronic on a VW Passat V6 TDI). Manual mode, no kickdown, when I'm at a speed of 120km/h (2200t/min), the gearbox goes back to 4th gear, and 3rd gear while throttle is 100%. If I put throttle at about 50%, averything is ok, the car is accelerating normally, staying in the 5th gear.

What could be wrong ?

Regards,

gdepre

I'm not shure at all but i guess it could be relationed with the rpm's and decelaration. Tiptronic i guess is command by the ecu or some kind of intelligent system and probably the manual mode coordenates best when you change up the gear then wher you change down :lol: I really don't know anything about the tiptronic system at all, i reply based on follow my logic :lol:

Masters should know the right answer certainly ;)

by **gdepre** » Sat Nov 23, 2013 10:32 am

That problem comes when I start accelerating at ~120km/h, then the gearbox goes from 5th to 4th, and even 3rd (throttle 100%).

With my original bin (150HP), there is no problem, the gearbox has a normal behaviour.

gdepre

by **RPM freak** » Sat Nov 23, 2013 12:18 pm

You are requesting too much torque at low RPMs so the gearbox goes one gear down. V6 TDI are very sensitive on badly made torque limiter.

My guess is that in your mod file there is +25% on the torque at low RPMs :D

by **gdepre** » Sat Nov 23, 2013 12:20 pm

Thanks for your answer.

Too much torque at low RPM, does it has an impact when I'm at 2200t/m ?

gdepre

by **RPM freak** » Sat Nov 23, 2013 4:40 pm

by **ddevilwrc** » Sat Nov 23, 2013 6:27 pm

RPM freak wrote:You are requesting too much torque at low RPMs so the gearbox goes one gear down. V6 TDI are very sensitive on badly made torque limiter.

My guess is that in your mod file there is +25% on the torque at low RPMs :D

+1 For this. This is the normal behaviour if the torque limiter is raised.

by **gdepre** » Sat Nov 23, 2013 9:34 pm

Thanks for your reply, everyone :)

Do you all know how much must the limiter be on thoses tiptronic gearbox (especially on 2.5 TDI V6 engines) ?

Have you got some clues to give ?

gdepre

by **dvisko** » Tue Jan 14, 2014 8:02 pm

gdepre wrote:Hi !

I just remapped my car with help of djbalkanac that I thank a lot.

Since the remap, I've got a strange thing with my gearbox (tiptronic on a VW Passat V6 TDI). Manual mode, no kickdown, when I'm at a speed of 120km/h (2200t/min), the gearbox goes back to 4th gear, and 3rd gear while throttle is 100%. If I put throttle at about 50%, averything is ok, the car is accelerating normally, staying in the 5th gear.

What could be wrong ?

Regards,

gdepre

Hi,

many people doesnt know that even in tiptronic mode it does kick down. So when you floor it it goes 1 or 2 gears down. That is ok. If you want to stay in gear that you are in you have to stick shift knob in + and hold it there and floor it. That way you avoid kick-down.

Regards