Very interesting stuff. Thanks for posting your discoveries.

 

Interesting work.
so this switch is good in mercedes and BMWs but not for the turbo.
I'll take the 6-speed at any time.

 

Todd

This is very interesting, so much so I have joined the forum to post a reply/query:

I used to have a 996 and am fairly sure from what you describe that this was a feature of kick-down (I assumed due to turbo lag) that I stopped using it altogether and always selected a lower gear, if necessary, as I put the throttle down which resulted in a much more consistent acceleration as you describe.

I am now in the early stages of the 997 TT experience and have held back from kick-down until I have a few more miles on the clock. Whilst that is happening I do have a couple of questions/thoughts :
1. is "over-boost" not linked to the pedal switch, i.e. the extra 60bhp - I had thought not originally but the Porsche manual does seem to imply that it is.
2. Is it not realistic to ask Porsche themselves about this behaviour as it is not desirable?

 

Todd,

I am not very familiar with tiptronics, so forgive me if this is a silly idea, but is there any way to tie your throttle step down switch into the manual/automatic mode selector? My idea is that when you select manual mode, the throttle step down switch would be turned off automatically and then when you put it back to auto, the step down switch would come back on. Since I have no idea how to switch between auto and manual, I dont know if it would require an electromechanical switch or if it would need to be programmed, but I am sure you know.

 

Thank you all for your questions, responses and interest in this thread.

I have done some more detailed research and found that there is no switch in the pedal. After purchasing a 997TT pedal and dissecting it, the ”switch" that offers resistance against the pedal is just a spring loaded stop with some detent springs. It has nothing to do with the communication with the transmission computer. The communication comes from the potentiometer on the accelerator pedal when it moves past this point. I will be comparing the values from the Tip pedal to the 6-speed pedal shortly to see the differences as well as the possibility of using the 6-speed pedal. I have a 997TT Tiptronic in our shop for our EVT-610 tuning system that I will be using to get this project completed.

I apologize for not responding sooner and I will answer all of the questions that I have answers to individually.

 

Just repeating what others have already said: GREAT information, GREAT work, thank you for the effort. Pro tuners/modders like you make 6speedonline unique.
Your "discovery" is so interesting I cross-posted it on rennteam.

 

Inform us plz Todd.. We the Tip owners are in the dark....
I bought today a driftbox in order to do some tests...

 

when driving my 997 turbo tip, i was trying to find out as to when overboost kicks in. it is not related to either kickdown or gas-pedal travel.

it must be more related to gear and rpm. i think the ecu requests overboost according to level od accelleration requested by gas-pedal travel and calculates it into boost pressure varying eiter between 1.1 to a maximumof 1.2 bars of pressure....

i am not a mechanic or engineer. this is solely based on my observations when driving the car.

 

Moral of the story:
Drive a stick.

 

Todd do have any news in reference to this topic ?

Mike

 

Yup - that's what I read too.

 

You trade in your car when your ashtray is full ?, or when your tires need air ?

 

Todd are your testings done in a car with Sport Chrono + Power Boost?

On another note I drove on the track a Tip/Sport Chrono and even with the Sport button on I didn't like much to say the least, I didn't like period...

but I guess my opinion is pointless in a thread that is trying to discover what the heck is going on in the Tip ECU...

I just hope you guys do a good program for manulas and I'm in...

 

Todd any news on the Tip evaluation ?

Mike

 

Should we press the pedal about % 90 ?

What is the exact point of this ? Anyone ?