Launch control for Motronic

[mouse]

It shouldn't? Hum. Well that's a no fun standard design. So this mod is less a launch control as title sugests and more anti lag seeing as its only spooling up the turbo pre load. To me launch control sugests the whole f360 esq does all the tc, pulls back on the throttle for the dumb driver and should not go anywhere near an s2. Anti lag is more agreeable in principal although I do think if its being done on an audi it should be done in the original audisport way of the unluft, even if its a new word to me for this hardware, rather than a software solution.

Read the thread !

[prj]

That looks good. Have you done this on 3b or cop only?

I found out that 3B does not have VSS, so I can't do it on 3B

[HuwSy]

HuwSy, no offence but your posts here is ZERO-informative. Can you please post a vid of how you do a drag launch?

Im more a traffic light launch not track so cant really video it, and probably not that good at that tbh but it provides entertainment in the mornings commute. But the rally method used to be rev it right up, dropping the revs then kicking it again as you drop the clutch.

Read the thread !

I read the title and 1st page to no avail it seems, but LC has a different meaning entirely to AL in my thinking.

[prj]

Im more a traffic light launch not track so cant really video it, and probably not that good at that tbh but it provides entertainment in the mornings commute. But the rally method used to be rev it right up, dropping the revs then kicking it again as you drop the clutch.

And your car bogs down every time, especially with a bigger turbo

[HuwSy]

Should the solution to this not be hardware though not software. There's probably a good reason audisport developed the umluft rather than fidling with electronics.

[HuwSy]

Especially as the standard turbo is relatively low lag, if youv already swapped that out for a bigger one then may as well have a bigger one with some tweaks.

[S2central.net]

I hope this thread doesnt confuse people.

Variable launch control (VLC) is one thing - essentially a modification to rev limiter while car is stationary so the engine can build boost in preparation for an "exciting" departure.

Full blown antilag system (ALS) is something else whereby the ecu essentialy tricks the engine into sparking late when the driver has lifted off (for a gear change or corner). The result of that is lots of popping and banging that keeps the turbo spinning in order to minimise any lag when the throttle is reapplied. This is not really for casual / street use as it must surely increase stress on the turbo and is really only for race / rally application IMHO.

[prj]

Should the solution to this not be hardware though not software. There's probably a good reason audisport developed the umluft rather than fidling with electronics.

All I can say is - please go to at least one drag race and see how big turbo cars launch.
Until then, please sell your S2 and buy a carburetted car, because obviously electronics are all driver aids, and electronically controlling the engine based on driver inputs is also a driver aid.

That is all that I am going to say on this subject.

[Billman]

for true antilag most of the time there are also other hardware modifications necessary in order to let enough air past the TB so that the excess fuel can burn. There are kick solenoids and/or other mods for this that either hold the TB open during gearchanges or let enough air bypass the TB. with the stock hardware a full ALS is not doable.

[prj]

Full ALS is not doable, but if you are able to keep WOT during gearchanges and at start, your turbo will always be spooled up on a 1/4 mile.
Especially if you use a spark cut limiter with timing retard.

The problem is when you lift off the throttle and choke the turbo.

[andy10v]

HuwSy

Umluft info

http://www.bufkinengineering.com/Umluft.htm

I really would not do that to your car.

PRJ is /researching/developing/making something cool that people appear to be interested in, why piss all over it?

[Zoig]

PRJ is /researching/developing/making something cool that people appear to be interested in, why piss all over it?

"Haters gonna hate." :corey:
Basically there are always around 16% of people who keep whining just because they don't want to be in the same boat as the rest of 84%, basic human nature unfortunaltely.

Personally i'm really pleased with the Launch feature, I tried it on Prj-s car in drag strip and it was perfect (total 1/4th mile time was not, as it was my 2nd drag start ever). Because of some boost problems, i can't try this properly on my car, yet .

BTW, when Nissan GTR came out with the launch control (more or less identical to the PRJ-s solution) even Clarckson did not bitch about it, allthough he seems to be allergic to electronics

[quattrostyle]

I found out that 3B does not have VSS, so I can't do it on 3B

that's a shame really I appreciate your work though

[Simons]

I found out that 3B does not have VSS, so I can't do it on 3B

Hi friend!

I think that it has the signal, because the clima show it with one code, and the radio turn down the volume with less speed and the cruise control needs this signal

What I don't know if it's this signal could be used to make the launch control...

When I have time I will test these signals...but now I have anothers things to do

@ all, I tested the launch control on S2 Aby avant, Rs2 setup...and when you taste it, you want it....also when you see it on live. It's adictive

[S2central.net]

I think you are right that VSS exists on 3B cars with climate, cruise and gala radios - BUT the VSS absolutely does not enter the ECU unfortunately. Adding that is probably technically possible but would be a heap of work with additional hardware and custom code to make it work.