Traction Control

[hoveringuy]

Anyone here have traction control? I'm not talking the stock ASC, but Racelogic or similar.

I'd like to know how it works for you. Worth it?

I'm looking into the technical side of it and would be interested in developing it with a dsPIC processor. My car has the ABS so it would be a matter of reading the 4 ABS channels, RPM, and cutting injectors on a rotating basis.

[sharky]

prob better off on BFC, plenty of guys running race logic over there. There's a GB going on too for like 1100 or so.

[justin_l_]

mulitplex runs traction control. Don't remember which one though.

[justin_l_]

http://www.e30tech.com/forum/showthread.php?t=58761&highlight=traction

I don't know if there are any vids of it in this thread but there should be somewhere.
Racelogic btw.

http://www.youtube.com/watch?v=XvxLdSQxwP0

From that link you should be able to find a vid on his traction control on/off

[Dominic49]

Anyone here have traction control? I'm not talking the stock ASC, but Racelogic or similar.

I'd like to know how it works for you. Worth it?

I'm looking into the technical side of it and would be interested in developing it with a dsPIC processor. My car has the ABS so it would be a matter of reading the 4 ABS channels, RPM, and cutting injectors on a rotating basis.

why not cutting spark. a little safer for the motor but a little worse for the enviro....

[LowR3V'in]

I'm not 100% sure, but it looks like megasquirt uses something like that
for traction control.

[Cronus]

MS retards the timing. retarded timing = less power = less wheel spin.

[LowR3V'in]

Well you either enrich, or retard.

....or enrich/retard at the same time.
idk what the boost logic thing does.

[hoveringuy]

I am going to dig into this when I get some time.

I'll start with a wheel spin detector which is a large part of the software.

Reading into the Racelogic literature, they do rolling injector cut because ignition cut can dump fuel into your cat and overheat it. Rolling injector cut keeps the runners equally wetted with fuel.

Retarding timing would be nice if you could integrate with the ECU.

I'm already tracking crank position with my VANOS circuit, so a proper injector cut wouldn't be that much more difficult.

If I can get a spin detector to work well both in straight acceleration and turns I'll expand the scope to cylinder cut.

[matt]

You can integrate with the ECU.

Basically the way the stock ASC system works on BMWs is two-fold. There is a "quick" intervention that is a signal from the ASC to the DME to retard timing OR cut fuel. The DME will NEVER allow a cylinder with fuel in it to fail to fire if it can help it. (selective ignition cut is NOT an option). The "slow" intervention is the secondary throttle body which is controlled solely by the ASC box. This is to both reduce overall power output AND slow throttle response, both of which are good for traction in low-adhesion situations.