Got a question ...

Can I calculate the amount of air flowing into my engine by looking at the MAF logs?

I am basically trying to figure out a way to calculate my engine's VE, for which I assume I will need to be able to calculate/log boost and airflow, correct?

l8r)

 

I thought I saw a fomula within the s-afc forums to calculate airflow based off our maf reading.....

 

Unless I am mistaken, MAF reading _is_ the amount (mass) of air flowing -- although you probably want to do a unit conversion to get it to kg/sec.

d

 

hmm, thats a good question, but the Airflow is logged in loads which are always going to be different so you would have to do a couple runs in 3rd gear or so and average your data before you can do the equation...somebody correct me if im wrong


nevermind im confusing myself

 

You wouldn't happen to know what units the MAF measures in?

To calculate my VE, I'm thinking that I will still need to log boost along with MAF though, because, for example:

if 100% VE, 2.0l block, 5000 rpm, 19 psi equals to 405 cfm

then measuring 365 cfm with the same setup (2.0l, 5000 rpm, 19 psi) should mean that I am actually operating at 90% VE, correct?

l8r)

PS.: the above calculation may be slightly off ... too lazy to double-check if I used the right conversion value for PSI.

 

the MAF measures in Hz

 

So does anyone have a conversion table for the stock MAF? I.e. something like 1000 Hz = xxx cfm (or whatever units).

Shiv must have something like this, otherwise how would they know how much to adjust the MAF signal...

l8r)

 

Accually you might be better asking the guys from TTP or Full Throttle b/c they use the MAFTPRO which calculates VE

 

ludi, try hz*0.32 for est. cfm

got the number off stealth316.com (i think) and it match quite closely to my estimated flow at boost for my engine