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[Steve=Ravet%Prj=Eng%PCPD=Hou at bangate.compaq.com]

tsakiris at ed8200.ped.pto.ford.com Wrote:
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| 
|  
|| The advantage to MAF is that the computer can automatically adapt to engine 
|| modifications like a less restrictive exhaust or heads that flow better, 
|| right?  SD requires that the volumetric efficiency table be updated any 
time 
|| mods are done to the engine
| 
|This is true, but only at steady-state.  During (air flow) transients a value 
| for volumetric efficiency is still needed if you are trying to account for 
| first-order intake manifold dynamics.
| 
| Tony

Interesting -- can you elaborate further?  Suction through the MAF sensor 
"seems" pretty steady, although I imagine there is quite a lot of turbulence 
further down in the manifold.  What dynamics do you need to account for?

--steve