Launch control for Motronic

[Phil Payne]

Agreed on the button.
Well, this is better than nothing - also, it managed to build 0.2 bar boost on that car, and it's running a k26/k27 hybrid.

Cannibalise an iPhone 4 and use the antennae to build a palm sweat detector for the steering wheel.

[Acidburn]

pmsl - cheers paul

[S2central.net]

Will post a pic of my knob soon.

oo-er matron !

[Acidburn]

20 mins of fun with captain dremel to remove the extra material ?

Recruit Madwolf?

beat me to it

Paul, do you have a picture of the pot control so I can have a think of the best location on my urq.

[andy10v]

suggest something better than ~20 mins of fun with captain dremel to remove the extra material ?

Recruit Madwolf?

Good progress guys, think I need a new clutch first though, flat foot shifting sounds interesting though.

[S2central.net]

So... I took the plunge with the dremel and carved up the rear of the blank switch... bit of a phaff but not too bad - addition of an 8mm hole allows the pot control to poke through. I think its a bit of a blatent location though - especially without a nice black knob (can I say that ?) fitted to make it look prettier. I've ordered up enough parts for the 1st ten kits.

Anyone wants me to modify a switch blank as part of the service is fine as well as long as it is sent with the ECU for minor surgery - or you can do your own thing with regards personal preference for the pot location - the supplied cable will be long enough for most locations near the driver - and easy to extend for the more bizarre suggestions.

[Rocco]

edited...

i did not knew in WTF i was thinking in the writing moment

[S2central.net]

So I have source some nice compact pots that will fit in either the centre console near the ciggy lighter or in an unused upper console switch.

the problem with the console switches is attached - lots of plastic needs to be neatly removed in a switch blank to add the pot... Does anyone know of alternative types of blank - or suggest something better than ~20 mins of fun with captain dremel to remove the extra material ?

[S2central.net]

Pmsl

[Dan]

one friendly drag race in space

[Rocco]

I'd like to see this on the RS2, must admit it's pretty brutal as-is if you do a 4k launch. I've only ever done one, too much drivetrain sympathy

only 4K rev launch?? i was doing a 6/7K launchs in one friendly drag race in spaIN,and no problems

[S2central.net]

@sonic - thanks for restoring sanity here. I go out for one night and missed all the 'fun' it seems.

[prj]

While Paul was looking once again at the pages and pages of Excel spreadsheets gone into this, he realized that because of the way the RPM limiter is calculated in Motronic we have a small problem.

Namely the fact, that our variable resistor adjustment does not have a linear change.
It is finer at the low-end and then gets more and more progressive at the higher-end.
So this means that while you have adjustments as fine as 10 rpm in the lower end, in the upper end even a single touch of the knob will adjust the limiter by 120 rpm and more.

This wasn't really acceptable, so I came up with a way of linearizing the adjustment, so that it is always a 36 RPM change. No matter where in the range.

This is illustrated by the following graph.
The blue line is the delta for each little change in the adjusting knob's resistance without linearization.
The red line is the same delta, but with proper linearization applied using some assembly coding inside the ECU:



This means we are getting closer to the final version.

[Dan]

Depends, the topic is now Dinosaurs, right? I like dinosaurs...

Okay, srsly. Nice to see some preliminary results, thanks Paul.

[Sonic]

If you can keep this thread on topic gents, it would be most appreciated

You know who you are!