Switchable ecu programs for 993tt?
#16
I think Kevin can answer the boost control question. My understanding is its not "loose" montronics in that the ECU still does all its supposed to...if you go into an overboost situation it will still pull timing, etc. Good question though. Kevin probably has a response somewhere on this or the 996 board that could be cut and pasted here.
#17
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I think there might be confusion between 1) Motronic controlled boost vs. fixed boost and 2) switchable programming..
You can have switchable programming (2 or more different programs) with either, a fixed boost program or Motronic controlled boost program irrespectively.
To put it in different terms,
I run a boost controller on my car, and I have both a 1.1 Bar optimized program (or Chip or Eprom), and a 0.7 Bar optimized program and I could choose between them with a switch if I had one. When I run at 0.7 Bar, the timing and fuel tables will be optimized for those levels on the dyno, and the same applies for 1.1 bar, which will then have different timing parameters.
Another person has a Motronic controlled program (Manthey for instance), with both a 104 octane file, and a 93 octane program/EPROM, and he can choose between them with a switch, again, he will be running the best possible program with each octane level (within tuner tuning skills obviously).
The difference between programs will be fueling, timing, boost etc.. not boost alone.
As to the merits of fixed vs variable boost control, it is a different topic.
You can have switchable programming (2 or more different programs) with either, a fixed boost program or Motronic controlled boost program irrespectively.
To put it in different terms,
I run a boost controller on my car, and I have both a 1.1 Bar optimized program (or Chip or Eprom), and a 0.7 Bar optimized program and I could choose between them with a switch if I had one. When I run at 0.7 Bar, the timing and fuel tables will be optimized for those levels on the dyno, and the same applies for 1.1 bar, which will then have different timing parameters.
Another person has a Motronic controlled program (Manthey for instance), with both a 104 octane file, and a 93 octane program/EPROM, and he can choose between them with a switch, again, he will be running the best possible program with each octane level (within tuner tuning skills obviously).
The difference between programs will be fueling, timing, boost etc.. not boost alone.
As to the merits of fixed vs variable boost control, it is a different topic.
#18
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Originally Posted by Jean
I would say that there are two ways of doing this on a Motronic based car, and you also have the option to go for a different solution with an aftermarket ECU such as Motec, Thielert etc..
#19
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#20
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From what I understood, the 1997 ecu is flashable but to do it through the obd2 port, the data transfer rate is so slow, it makes it not that practical. Also the technician who was working on this now 15 years ago had health issue unfortunately and was never finished.
#21
Nordschleife Master
From what I understood, the 1997 ecu is flashable but to do it through the obd2 port, the data transfer rate is so slow, it makes it not that practical. Also the technician who was working on this now 15 years ago had health issue unfortunately and was never finished.