Rev De-Limit A Tip

**titanic** · #1 (**permalink**) 07-10-2008, 02:49 PM

Does anyone know how to delimit a Tiptronics? Would the dealer do it? The rev limiter is controlled by the Tip control unit, not the DME.

**KS-CS** · #2 (**permalink**) 07-10-2008, 03:02 PM

I doubt a dealer would do it, even if they could (though maybe the PIWIS has the capability?).

When Scott (Softronic) first came out with the Snap-Flash, which can raise the rev limits on MT cars, he told me that because of the separate Tiptronic controller it wasn't possible to change Tip rev limits with his software (except maybe for 5th gear IIRC). I've never seen any mention of anyone reprogramming the Tip controller.

zoomee · #3 (**permalink**) 07-14-2008, 01:29 PM

I had an interesting experience yesterday at an autocross. I was mixing runs with and without the PSM on and at the start of one of the runs I thoroughly confused the tiptronic controller. At the start I always put the trans in manual mode and select first gear. I then floor it and let the tiptronic shift into second at redline. On a run with the PSM off the car would not shift into second. Instead it got into the rev limiter and started cutting the engine power

. I had to manually shift into second using the rocker switch. Needless to say it was not my fastest run which was done with the PSM on. The event never repeated itself.

As a side note, I finished third in my class beating out a number of modified Boxster S's and 911's. My Goodyear Eagle F1 Asymetrics may not be the grippiest tires but do a fairly decent job and it looks like they'll last forever. I also did a DE event in the rain with these tires and they are AWESOME in the wet.

**titanic** · #4 (**permalink**) 07-14-2008, 01:47 PM

Quote:

Originally Posted by zoomee

I had an interesting experience yesterday at an autocross. I was mixing runs with and without the PSM on and at the start of one of the runs I thoroughly confused the tiptronic controller. At the start I always put the trans in manual mode and select first gear. I then floor it and let the tiptronic shift into second at redline. On a run with the PSM off the car would not shift into second. Instead it got into the rev limiter and started cutting the engine power

. I had to manually shift into second using the rocker switch. Needless to say it was not my fastest run which was done with the PSM on. The event never repeated itself.

As a side note, I finished third in my class beating out a number of modified Boxster S's and 911's. My Goodyear Eagle F1 Asymetrics may not be the grippiest tires but do a fairly decent job and it looks like they'll last forever. I also did a DE event in the rain with these tires and they are AWESOME in the wet.

Obviously you didn't put the pedal all the way down, otherwise it would've upshifted automatically regardless PSM on or off. But do you have a solution to delay the engine cutting power off at higher rpm?

zoomee · #5 (**permalink**) 07-14-2008, 02:27 PM

Trust me, the floor was the only thing keeping the pedal off the pavement.

I have performed this type of start over 100 times and this is the only instance where something like this has happened. I don't know whether the PSM was the culprit or not. It felt the same way as the PSM intervening to limit the throttle when the *** end of the car is about ready to break free. Since I have a tiptronic I don't know what it feels like to hit the rev limiter in this car but this felt similar to the rev limiter I have bounced off of in other cars I have owned.

I was only offering this as some insight as to what might be going on electronically with two different controllers trying to limit the same activity in the vehicle. I think the first thing to solve would be to delay the upshift past the redline. Then you could start working on the more traditional rev limiter. My experience may show that it is possible to delay the shift so that the rev limiter can be hit. Has this happened to anyone else?

zoomee · #6 (**permalink**) 07-14-2008, 03:19 PM

Okay, I confess. I now officially belong to the Did Not Read The Manual Club.

Page 169 in the 2006 manual states:

"If the PSM is switched off and/or Sport mode is
switched on, an automatic upshift does not occur
when the engine speed limit is reached."

However, I will state that on other occasions when I have turned off the PSM I am pretty sure that I have gotten an automatic upshift.

This would imply that the Softronic will be able to overrride the rev limiter on tiptronic cars but would only be useful when the PSM is turned off. I guess the only thing to do is to perform some controlled experiments on some deserted roads to verify the PSM function.

PS. it doesn't matter what the throttle position is as the rev limit can be reached at half throttle in first gear.

**titanic** · #7 (**permalink**) 07-16-2008, 09:29 AM

Quote:

Originally Posted by zoomee

Okay, I confess. I now officially belong to the Did Not Read The Manual Club.

Page 169 in the 2006 manual states:

"If the PSM is switched off and/or Sport mode is
switched on, an automatic upshift does not occur
when the engine speed limit is reached."

However, I will state that on other occasions when I have turned off the PSM I am pretty sure that I have gotten an automatic upshift.

This would imply that the Softronic will be able to overrride the rev limiter on tiptronic cars but would only be useful when the PSM is turned off. I guess the only thing to do is to perform some controlled experiments on some deserted roads to verify the PSM function.

PS. it doesn't matter what the throttle position is as the rev limit can be reached at half throttle in first gear.

I have tested the PSM off, it will upshift as long as you kickdown. No kickdown then no auto upshift. And for Tip power still cuts off at about 7200rpm regardless of PSM on or off. It would be great if somehow we can figure out how to raise that limit beyong 7200rpm.