Author Topic: maf, before or after turbo?  (Read 1612 times)

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Offline pedro666

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maf, before or after turbo?
« on: Nov 14, 2012, 10:20AM »
i have seen both version of this , what do you guys think, before or after?
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Offline noss

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Re: maf, before or after turbo?
« Reply #1 on: Nov 14, 2012, 11:46AM »
i think before.

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Offline SSS

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Re: maf, before or after turbo?
« Reply #2 on: Nov 15, 2012, 06:28AM »
Considering most factory turbo cars have the MAF's attached to the airbox lid, i'd be inclined to do the same and run the MAF between the filter and the compressor inlet.

The only downside to doing it this way is that if your intake path after the MAF has any leaks, you will possibly over fuel the engine as the MAF is seeing, say, 100% air flow at max load, whereas the engine will only see 90-95% air flow due to losses to atmosphere from leaks...more fuel and less volume of air / positive intake pressure means less torque / power.

You'll drive yourself batshit crazy trying to get it leak free....so might be best to run it in the cold pipe between the intercooler and the throttle body / plenum inlet.

This is why MAP sensors are king....they will always see (near) true engine load at the intake manifold.

What MAF are you running, and most importantly what boost level/s?

Offline pedro666

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Re: maf, before or after turbo?
« Reply #3 on: Nov 15, 2012, 12:25PM »
at the moment's I have it still on default which I think is .12 psi. however I have only got it to 10psi @5300 rpm .then I got the fuel pressure regulator problem.
n62 maf ;)
« Last Edit: Feb 25, 2013, 08:38AM by pedro666 »
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Offline mendezcr

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Re: maf, before or after turbo?
« Reply #4 on: Nov 19, 2012, 03:46AM »
I did turbo upgrade first and I could only enjoy it at 10psi, knowing the turbo could take 16-17psi, now I'm saving money for bigger injectors and a bigger MAF, so I can feel at the fun!!.. Now thinking I would do it back wards , MAF + injectors , then the turbo so I can enjoy all the fun (full boost) at once.. I'm a little boost addicted :)