MAF Conversions

[peter paul fenske]

>'Everyone' talks about MAF conversions of existing EFI systems but can 
>anyone answer me a few questions about the whole exercise?
>
>1- what does a MAF sensor offer that a MAP and inlet air temp sensor 
>
>>MAF directly measures Air Mass. Fueling is simply based on AF ratio
>>desired not extensive engine mapping. In other words a change in
>>engine parms does not require a recalibration within limits.

>2 - are analogue (voltage) output devices used more commonly than 
>frequency output?
>
>>FM is prob less susceptible to connect errors. Other than that.
>
>3 - how are they normally sampled in these conversions, synchronously 
>at a determined crank angle, synchronously at any angle at all, or 
>asynchronously?
>
>>MAF is continuous. Just like MAT or CTC.
>
>4 - how do you know that the airflow you're measuring is actually 
>there?  Do people just slap them on and hope, or is some science 
>applied to make sure inlet manifold resonances are not upsetting the 
>signal?
>
>>The Bosch MAF uses screens to generate laminar air flow with 
>>temp corrections.
>
>5 - How about reverse flow?  Is this any concern in the average 
>conversion?
>
>6 - what kind of manifold filling compensation do people use?
>
>>Usually taken care of in VE corrector.
>
>Thanks for your replies in advance
>
>Andrew Rabbitt
>Orbital Engine Company
>
>Update from Peter 85 coupe: Hi
>
>
>