Launch control for Motronic

[prj]

Too much work.
But if you want to do it for yourself - it's likely you can.
The ECU expects a 0-5V input, that's pretty much all that there is to it.
Anything you can install that generates voltage in that range will work.

[Zoig]

Working on the analog adjustment today - will require some ecu mods and link cable to an external pot.

Is there a possibility that it could be adjusted via the adjustable intermittent wiper button on A4 B5 stalk?

Looks similiar to B4/C4 stalk, so it might be possible to install this to B4/C4 cars.

[Dan]

This thread makes me want to learn more about Motronic.

[S2central.net]

Working on the analog adjustment today - will require some ecu mods and link cable to an external pot.

[prj]

Buy it, buy it, buy it
Paul can help you with it as well.

[Error404]

very cool mod

[blackS2]

thats impressive!!!

[Jonas_R]

It works from speed.
If your car is not moving, then you will have 4900 RPM or whatever it is set that.
If it is moving you will have normal rev limiter.

It does not know if you are in neutral or not...
And just for basic launch control where the range is written in the chip you don't need any switches or any extra wiring - it is purely a software upgrade.

Ok thanks and nice work

[prj]

One last question.
If you make the adjustments to the chip, then the launch control will always be on, right? I mean it does not use any kinda sensor on the clutch?
In principal I could just press that gas pedal in neutral or 1st gear (with clutch pressed down) and it would keep the revs at 4900 RPM?

It works from speed.
If your car is not moving, then you will have 4900 RPM or whatever it is set that.
If it is moving you will have normal rev limiter.

It does not know if you are in neutral or not...
And just for basic launch control where the range is written in the chip you don't need any switches or any extra wiring - it is purely a software upgrade.

[Jonas_R]

One last question.
If you make the adjustments to the chip, then the launch control will always be on, right? I mean it does not use any kinda sensor on the clutch?
In principal I could just press that gas pedal in neutral or 1st gear (with clutch pressed down) and it would keep the revs at 4900 RPM?

[prj]

How would you hook up the potentiometer so you could have adjustable RPM?

Soon(tm)

I pressume that if you dont have the potentiometer then it will just rev to 4900 RPM or what you set it to in the software?

Yes.

[Jonas_R]

Sounds very interesting

How would you hook up the potentiometer so you could have adjustable RPM?

I pressume that if you dont have the potentiometer then it will just rev to 4900 RPM or what you set it to in the software?

[prj]

Would this have the potential to cause some damage if something went wrong? Say if you are trying to flatchange close to redline and the clutch switch malfunctions I suppose you would just hit the normal rev limiter/fuel cutout unless there was some some other sort of failsafe mechanism built in.

Yes, you will just hit the normal rev limiter and nothing will happen.

[mouse]

You need a switch under the clutch pedal. If TPS says that you are WOT, the switch is depressed and the vehicle is moving, the ECU cuts fuel.
That way you prevent choking the turbo and when you are done shifting you'll still have boost.
A bypass valve does this too to some extent, but this is much more effective.

Would this have the potential to cause some damage if something went wrong? Say if you are trying to flatchange close to redline and the clutch switch malfunctions I suppose you would just hit the normal rev limiter/fuel cutout unless there was some some other sort of failsafe mechanism built in.

[DS2]

i think these are a must have... just because