Shutting fuel off whie driving.......rpm limiter

[Simon Quested]

Hi All

I have an old analog ecu, MAP only, Batch fire, fires every time the 
coil fires. The 4 injectors are in parallel and 2 wires go from the 
injectors to the ecu

I was thinking that if I use an rpm switch triggered from the -ve of 
the coil to control a power transistor (used as a switch) that is in 
the positive side of the injector feed this would give me an RPM 
limiter.

Is stopping the fuel a good idea?

>From what I have gathered most rev limiters kill the spark but the  
rpm switch I'm using triggers from the coil so if the spark gets 
killed the rpm switch will think there is 0 rpm.

My only other option is to get the rpm signal from the dizzy but my 
dizzy is a Hall effect and I'm not to familiar with how to get a useful 
signal from it.

Cheers

Simon
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  Simon Quested 
  Computer Engineer, Silicon Graphics & Windows NT Support
  LINCOLN UNIVERSITY OF NEW ZEALAND
  Phone (64)(03) 3252811 Ext. 8087
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The two most common elements in the universe are hydrogen 
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