FAST rev limiter?

[TurboTR]

What does the FAST rev limiter do- cut fuel, cut spark, ? Can someone who knows describe it please?

TurboTR

 

[Lance]

The rev. limiter in the ECU is really not intended for rev control as much as it is a measure to prevent over revving the engine. In the case of the FAST system, it is a fuel cutoff with programmable parameters. In my opinion, it is not a good idea to have the ECU do the rev limiting for a system designed to work with many different applications. For instance, to cut the spark while interfacing to a Buick C3I module would cause the C3I module to lose synchronization with nasty results. In my opinion, it's better to leave that to the specific ignition system.

Lance

 

[TurboTR]

re:

Hmm, good points. Thanks Lance. So the Buick DIS module would lose sync if it loses the EST signal periodically? I assumed the crank and cam signal were all it needed to stay in sync(?)

I hit the FAST rev limit hard in 2nd, full throttle for 1-2 seconds with nitrous on, 28 psi boost. It worked well- no kabooms, no problems. Impressive.

TurboTR