Aftermarket EFI, speed density etc.

[Andrew Dennison]

Peter Wales wrote:
> 
> The user *will* require a constant air fuel ratio! Stoichiometric to be
> exact. This allows the catalytic converters to work correctly by providing a
> uniform gas mixture in the exhaust. 

You are assuming that everyone HAS to run at catalytic converter.  
This is not true.

> 
> Again Robert is getting mixed up. The reason racers use throttle angle and
> engine speed is that it is very easy to set that up on a  dyno and then know
> which row and column in the map to change.

Engines with large valve overlap and / or individual throttle 
butterflys have very low average MAP values (ie very little 
depression below ambient).  They exhibit spikes in the MAP for the 
induction events:  I believe you may be able to use the peak value 
of the MAP signal but throttle position is generally used.

Andrew

------------------------------------
Andrew Dennison - Research Associate
The CIM Centre
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