PaSteLaSo4U

iTrader: (-2)

Wondering if going from 2nd gear 40 WOT punch to D and bypassing 3d its ok to do, or i'm leaving something on the table??
Reason been last night I tried shifting from 2nd to 3d and she bounced of limiter a few times [ongoing issue] then I said the hell with it and tried again but skipped 3d as the rpms got closer to redline and went to D and it shifted fine. Dunno if that's another option going to OD or will it hurt anything ? any input is appreciated...

PaSteLaSo4U

iTrader: (-2)

anyone?

heymoej

iTrader: (67)

when i raced my 4l60e @ the track i left it in OD....matter of fact i always left it in OD on the street too.

it had a YANK PT4000.

ThumpnZ28

iTrader: (23)

Manually shifting the 4L60E under load like that is not good for it. It is designed to shift itself once certain conditions and parameters are met.

ArkBird96

Manually upshifting the 4l60e will not do any damage. Manually downshifting a 4l60e unless it's from OD to D3 will kill it very quickly.

Manually upshifting can, however, cause you to hit the redline if you don't shift soon enough. While the electronics in the trans act instantly, the hydraulics in the trans take longer. So, even if you shift before the rev limiter, the hydraulics in the trans will be slower and might cause you to bounce off the limiter. You can't shift better or faster than the computer can. If you are having issues with the trans short-shifting, you need to get a tune.

PaSteLaSo4U

iTrader: (-2)

thanks, so going from 2nd to D instead of 3d it's ok? i'm skipping a gear and going to OD, that's my concern, but it shifts fine and doesnt bounce the rev limiter

ArkBird96

I still would just leave it in D3 or OD when you race. Are you roll racing and just don't want the trans to upshift?

But no, doing that will not hurt the trans.

PaSteLaSo4U

iTrader: (-2)

Thanks for your input. Correct, roll racing, and my butt dyno feels the car runs stronger when i put it in the lower gear then hammer it and quickly upshift to D as the rpms climb up, specially from a 40 roll where there's that kickback lag

ArkBird96

What rear gear are you running? is it the 2.73 or the 3.23 rear axle? 3.23s are known to have a dead spot at 40. That can be solved with a torque converter with a higher stall speed. The higher stall speed will get you up in the power band quicker, and that will really wake things up!

That downshift can be a real pain when roll racing from what I've heard.

PaSteLaSo4U

iTrader: (-2)

Here's the difference between 3d and D
Before
http://youtu.be/9GNoSMuNTXU

After
http://youtu.be/gAkGV_klNeA

ArkBird96

Sounded like in the first race you were hitting the rev limiter a good bit, but it might just be the video. I would say you would be a good candidate for a new torque converter and/or a tune.

PaSteLaSo4U

iTrader: (-2)

i was told she has 4.10 gears and 4k PI stall, but i'm not 100%, on the dyno the mph went up to 135 at the end of the pull on 275/40/17 tires and the she revs out at 7k

ArkBird96

A 4.10 rear gear ratio might be a bit too steep for an auto, but I'm not sure. Most people that I know that have autos go with 3.73 gears. It's easy to "run out of gear" on the top-end with 4.10 gears with an A4. A lot of the guys with M6 transmissions use 4.10 gears because they have the extra overdrive and don't have to worry about running out of gear on top end.

PaSteLaSo4U

iTrader: (-2)

yeah she hit the limiter few times and then shifted over. On that run i did a low 30mph roll and had her on 1st gear as oppose to 2nd from a 40 punch. From now on i'm going to try and just gear match the speed and as i go wot upshift her to D and let the tranny do the rest.

PaSteLaSo4U

iTrader: (-2)

I think she has 3.73 gears instead of the 4.10's i was told. Just dont think she would wind up at 135 with my rear tire size and a 7k rpm..