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Old 10-23-2009, 06:50 PM   #73
JSarv
Scooby Specialist
 
Member#: 163445
Join Date: Nov 2007
Chapter/Region: MWSOC
Location: Effingham IL (Central IL)
Vehicle:
l33t *******
12.07@115.9mph-EJ205

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Quote:
Originally Posted by SVT_WRX View Post
So by being able to remove the MAF restriction that you have in an MAF based environment, you can potentially make more power by using SD. Correct? I do understand however, that this does not necessarily mean you will have better drivability due to the MAF sensors better ability to adjust to varying outside conditions.
Ken is 110% correct. A maf sensor can theoretically be tuned for 500hp on 5 different turbos given the same intake is used everytime and swapping turbos could theoretically not need a retune.

Sd does not know volume of air, that is why there is a load comp map, you tell it (essentially) the volume of air per psia. Changing to a larger turbo changes this, meaning you may stikl be running 20psi but the volume of air moved and the fuel needed have changed, a map sensor doesn't know this.

A maf sensor will pick up on this as it measures volume rather than pressure. Given its not maxed out.

So when it comes down to it, maf metering is safer per conditions and changes, however it is limited by soundwaves(turbulance), airflow,innconsistency when using an oversized housing, and some other minor things.

If our maf sensor tunability was 3d you can bet your ass I'd still be using maf, but its not and won't be.

-jerod
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