MAP-dampening

[Fred Miranda]

>Hi!
>
>I have a question concerning MAP-sensor signal shapening. I have done a couple
>of home made FI systems during the last 10 years with success. My last project
>has a standard absolute airpressure sensor from motorola (MXP200AP) that is
>very quick. I have no experience in signal shaping of the jumpy idle pressure
>of the engine. My earlier EFI's has had std air flow sensors so i have not met
>this problem before. The only hint i have concerning dampening in MAP sensors
>is the old Bosch D-jettronic that has a flap valve with a small restriction
>that opens big when pressure differens gets high to aviod slow responsetime. My
>question is if i shold dampen the sensor pneumaticly or only electronically 
>(excuse my bad english). The advantidge with mecanical is more safety against
>destroying the sensor with pressure peak if backfire accurs. The sensor have a
>maxpress of 10 bars (145 PSI) and a linear output between 0-2,5 ATM
>(practical).
>
if you have any old weber jets laying around, try experimenting
with different jets and hose lengths (put the jet at the manifold)
If you over dampen it you will need to compensate with more
acceleration enrichments.

on an undampened system it would be interesting to experiment
with the timing of the samples
if I ever get a system of my own going, I would like to try
a sensor per intake runner and feed each on an individual
basis. Probably a bit overboard, but would be interesting.

Fred