[midlife]

hey guys, i am having a slight problem that hopefully is just DV related?

i have a 6AT with paddle shifters. sometimes when i go WOT, i need to hit the paddle shifters twice to get it to upshift once.
this never happens when i am just crusiung - just sometimes when i go WOT.
I would hate to bring in the car to the dealer cause i have ALOT of sh*t to remove if i do.

i was told to clean out the forge DVs every year or so (i do not drive my 335 that much), but hate to clean out my DV with just 6,000 miles on them.

any idea guys as to if it is tranny or DVs or something else ??
thanks

[psu139]

i think there is a way to reprogram the step back to its original settings. Have you tried unplugging the battery for ~1hour?

[sambonator]

Transmission failing to shift isn't related to your DVs.

Do you get the failure to upshift when you use the shifter knob, or only with the paddles?

I've never had the transmission fail to shift... I've had it shift twice frequently when I wanted to upshift once, as the the ECU tried to upshift (due to redline or just in DS mode) nearly at the same time as I manually tried to upshift.

Occasionally if you are losing traction and the the revs shoot up too quickly, the transmission gets confused and fails to shift and hits the rev limiter.

[midlife]

Originally Posted by sambonator

Do you get the failure to upshift when you use the shifter knob, or only with the paddles?

never use the shifter knob: will try it to see if there is the same problem.

Originally Posted by sambonator

I've never had the transmission fail to shift... I've had it shift twice frequently when I wanted to upshift once, as the the ECU tried to upshift (due to redline or just in DS mode) nearly at the same time as I manually tried to upshift.

i do not understand the second part of this statement.
when i am in manual mode at WOT, i will hit the paddle once at say 6,000 rpm and it does not shift... so i hit the paddle again and it is like 6,800 rpm and then it shifts. could be that the ecu shifting at redline - and maybe the shift is not because i hit the paddle again.

Originally Posted by sambonator

Occasionally if you are losing traction and the the revs shoot up too quickly, the transmission gets confused and fails to shift and hits the rev limiter.

could be since i drive with dtc pushed only once... but with my high altitude i kind of doubt i am losing traction during the shift - do not feel it. i will try dtc off completely and see what happens.

thanks

[jadeddjay]

do you always have this problem? when did it start?

from what i understand the paddle or knob selection sets the max gear. for example, if you are crusing in 4th and then you floor it, or go into step-down mode, it will go into 3rd or 2nd even though its set at 4th

does it help to let off on the throttle for it to shift then back on throttle in the next gear?

[leftcoastman]

Originally Posted by sambonator

Transmission failing to shift isn't related to your DVs.

Do you get the failure to upshift when you use the shifter knob, or only with the paddles?

I've never had the transmission fail to shift... I've had it shift twice frequently when I wanted to upshift once, as the the ECU tried to upshift (due to redline or just in DS mode) nearly at the same time as I manually tried to upshift.

Occasionally if you are losing traction and the the revs shoot up too quickly, the transmission gets confused and fails to shift and hits the rev limiter.

I reallly reallly reallllly like having a simple lever to control my gears.

[sambonator]

Originally Posted by midlife

...i do not understand the second part of this statement.
when i am in manual mode at WOT, i will hit the paddle once at say 6,000 rpm and it does not shift... so i hit the paddle again and it is like 6,800 rpm and then it shifts. could be that the ecu shifting at redline - and maybe the shift is not because i hit the paddle again.
...

I mean when I try to shift from say 6000RPM in 2nd gear to 3rd gear, I sometimes end up in 4th gear because the ECU had already sent a signal to the transmission to upshift... at the same time I sent a signal through my paddle shifter to upshift, causing the transmission to upshift twice from 2nd to 4th gear.

Are you sure it is failing to upshift? Maybe the delay in the transmission to upshift is making you feel that it had failed to shift. When I'm driving WOT I do notice a significant delay in shifting sometimes.... in 1st gear I think the RPMS jump about 1000rpm before it shifts.... in 2nd gear maybe 500 rpms at the higher RPM range.

[sambonator]

Originally Posted by leftcoastman

I reallly reallly reallllly like having a simple lever to control my gears.

I like using my left foot to brace myself in the car rather than operating a clutch. Without a proper racing seat and harness, I move around too much in the car. I really want a new double-clutch semiautomaitc gearbox!

[hotrod182]

I talked about this recently in my 1/4 mile testing. I had several runs that went from 2nd to 3rd very briefly, and then immediately to 4th. This is because the trans wouldn't respond to the shift lever input while the throttle was floored, so I pushed the shift lever again, and then suddenly it went two gears. This usually happens in the DS mode. In Manual mode, I think it will shift more obediently but then it may down shift and over rev at times if you spin/catch traction and then floor it again. If you are drag racing hard, the steptronics definitely has its quirks and is easily confused when you have to ease of the throttle and then stomp on it again. This is where you definitely have more control of what gear you want to stay in with the manual trans.

[leftcoastman]

Originally Posted by sambonator

I like using my left foot to brace myself in the car rather than operating a clutch. Without a proper racing seat and harness, I move around too much in the car. I really want a new double-clutch semiautomaitc gearbox!

Get a CG-Lock.

Lock the lapbelt, lean the seat back, lock the shoulder belt and lean the seat forward.

That sucker is so tight I can barely expand my ribcage while breathing.