TDI Launch Control

[duwem]

Came across this looking at other youtube TDI videos

http://www.youtube.com/watch?v=4_3cGbbQSXs

Why does it "bounce" off the rev limiter like a gasoline engine and not just hold an RPM like when you hit the stock limiter at 4500ish rpm?

Being your not cutting spark like on a gasser, could it just limit the pump travel to set the fuel quanitity needed for x rpm?

Purely wondering out of curiousity.

 

[robnitro]

It's explained in ecuconnections and some other thread, they are setting the fuel range to cut quickly, so it never can find balance. People do it because it "sounds cool" - popcorn limiter is the term.

It actually messes up boost. When I had it bouncing at 2600, I could do only around 6 psi. Now smooth 2600, I can hold almost 10 psi.

 

[brum]

And if you cut the fuel not so quickly - you get a steady RPM and actual launch control.

The pop-corn stuff is not good for anything but Café racers.