Launch control for Motronic

[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]

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]

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

[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 !

[Thuppu]

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

[HuwSy]

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.

[andy10v]

I never remember many issues with the very big turbo group b cars getting out of the gates which im sure the original quattro came under, although with some rallying differences that we probably cant easily apply to the standard kit given how few remain and expensive they are. And i doubt they had to worry about enabling a launch control starting. At those paces some had issues just getting around corners, or straights, without thinking of any switches.

So how does allowing more boost and the turbo to kick at lower revs benefit over sitting at high revs when, once you begin moving, the higher revs are needed? And the laggy turbo spin up also means it has a lag to spin down which was the trick to a decent start in the old group b's from what i remember, although it almost pre-dates me. So does this actually make much difference to the drag time or does it just reduce the risks meltdown in drag racing?

I think they had full blown anti lag, or some crazy umluft setup to burn in the exhaust manifold and spool the turbo.

A stock car will not build boost at whilst stationary, the engine has to be under load.

[HuwSy]

It allows the turbo to build boost while the car is stationary, so your turbo is spooled up when you are launching and the car does not bog down. It has nothing to do with someone not having enough skill to hold revs at 5000 rpm. Try launching a big-turbo or even mid-size turbo car without ALS/Launch control on a dragstrip.

I never remember many issues with the very big turbo group b cars getting out of the gates which im sure the original quattro came under, although with some rallying differences that we probably cant easily apply to the standard kit given how few remain and expensive they are. And i doubt they had to worry about enabling a launch control starting. At those paces some had issues just getting around corners, or straights, without thinking of any switches.

So how does allowing more boost and the turbo to kick at lower revs benefit over sitting at high revs when, once you begin moving, the higher revs are needed? And the laggy turbo spin up also means it has a lag to spin down which was the trick to a decent start in the old group b's from what i remember, although it almost pre-dates me. So does this actually make much difference to the drag time or does it just reduce the risks meltdown in drag racing?

[andy10v]

Here is what I am talking about:

http://www.youtube.com/watch?v=NpFScz9IbBo&hd=1

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

HuwSy
The launch control could be argued as a driver aid, however the ability to build boost while stationary is an improvement if you want to launch faster no matter how well you can balance clutch/throttle. I believe you should be able to hook up a early abs cancel by fooling the abs ecu into thinking the diff is locked and abs should be disabled, or just pull the fuse but abs is rather nice for dd.

[Thuppu]

I envy that track you have there... and I definitely want to have the LC/ASL system on my UrS.

[prj]

I'm more a mclaren f1 no driver aids madness over an f60 gadgety person to be fair and do think the simplicity and originality of these cars should be maintained as they become classic cars, with the posible exception to the simple alarm system unfortunately.

Except launch control/ALS is not a driver aid on a turbocharged laggy car.
Like COP ignition over distributor ignition is not a driver aid and EFI over a carburettor is not a driver aid.
It allows the turbo to build boost while the car is stationary, so your turbo is spooled up when you are launching and the car does not bog down. It has nothing to do with someone not having enough skill to hold revs at 5000 rpm.
Try launching a big-turbo or even mid-size turbo car without ALS/Launch control on a dragstrip.

Here is what I am talking about:

http://www.youtube.com/watch?v=NpFScz9IbBo&hd=1

You can hear the turbo spooling up.
And it was a customer car, so I babied it and shifted slow, just in case a million people would like to jump on me for that.

[HuwSy]

Or, if you have the superior 3B model, simply press the button on the dash

Boo. Missed looking into a few things here before buying it seems.

[HuwSy]

Well theres a positive over my retiring Puma, pulling the fuse on abs there also wiped a poor attempt at tc and a lot more than was expected.

[AndyP]

you don't have TC and you can turn ABS of by removing a fuse.

Or, if you have the superior 3B model, simply press the button on the dash

[driftin jo]

Oil pump and sat nav have little to do with driving control or handeling. Although given the option to take off tc and abs but without perminantly modifying the car I would. The s2 is a basic simplistic 4wd kind of car which is why I got this over a scooby or a gadget driven thing. I'm more a mclaren f1 no driver aids madness over an f60 gadgety person to be fair and do think the simplicity and originality of these cars should be maintained as they become classic cars, with the posible exception to the simple alarm system unfortunately.

you don't have TC and you can turn ABS of by removing a fuse.