Staged launch control: rpm ideas

[soldave]

Just got a new bit of code for my ECU (stock ECU, but using the Ostrich realtime chip emulator) and I'm pretty keen to have a play with it this coming Sunday at the latest drag race tournament here in Okinawa. I had been using a normal launch control code on my ECU set at 5,500 on the street and 5,200-5,400 at the circuit (the drag "strip" is more akin to an ice rink most of the time. But my new setup now has 3 launch control values. I can have one for when I'm stationary, and then 2 at set speeds and rpm values. The idea is to slightly limit acceleration in order to minimize wheelspin. As I'm not running drag radials this could be pretty handy.

Just wondered what people thought I should go for in regard to the other 2 speed/rpm combinations for the launch control. To give you some idea, the guy who made the code and who does hill climbs & sprints with his Evo has it set at the following:

4500rpm/3mph (stationary)
5000rpm/12mph
5500rpm/15mph

I appreciate any thoughts on this one.

 

[pneumo]

Interesting. Let me know how it works.

 

[boosted240]

sounds interesting

 

[pneumo]

I just had a thought. It should have been obvious, why didn't I think of this earlier?
The speed sensor reading is dependant on wheel speed, not actual vehicle speed. So if the wheels are spinning the VSS will read a higher speed and your rpm limit will go up to the appropriate rpm for that wheel speed.

 

[soldave]

I was thinking the same thing actually, man! Will need to do more research and chatting with the guy who designed that one.

 

[pneumo]

How about a time based rev limit? Use the stutterbox clutch wire to trigger the timer.