RE familia turbo..

[Brian Warburton, c/o Turbo Systems Ltd]

>With any luck FLAP = MAP x RPM x Constant & build with a few op-amps.

My work shows that FLAP = MAP x RPM x VolEff where VolEff is the
engines Volumetric Efficiency which will vary as function of speed
and load.

>Debatable. Might only be worth 5-10hp (at a guess). FLAP AFMs have an
>advantage in that they automatically compensate for bigger exhausts etc
>that change volumetric efficiency, whereas MAP need to be recalibrated.
>In a closed loop self learning computer this isn't a big drama usually.
>(actually I wonder if this is why virtually all EFI before the Mid 80s
>was Flap AFM based)

Flap AFM's or for that matter all AFM including the later MAF
hotwire types have one great advantage over the MAP (speed-density)
type system, AFM's give an indication of the actual mass of air
being "consumed" by the engine, the MAP type system gives you the
data to allow you to try and infer the amount of air being consumed.
The direct value is almost always more accurate than the indirect. 
Trying to meet serious emissions with a speed-density system is not
to be considered by anyone with a life, not unless they're starting
out with a very good base-engine design which exhibits excellent
feed-gas before bolting any electronics on it ......... 


By the way, the Jenvey Dynamics phone number for throttle bodies
in the UK is 
                01746-768810(phone) / 01746-768363(fax)
 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Brian Warburton, "Still searching for the perfect curve....."
email: bwarb at turbo.win-uk.net
                                Advanced Automotive Electronics Ltd,
                                Van-Nuys, Scotlands Drive,
                                Farnham Common, England.  SL2-3ES
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