Blow-through MAF setup
 

Has anybody tried doing a blow through MAF setup where the MAF is placed after the intercooler and before the throttlebody? I've seen this done on aftermarket turbo systems. It seems that if it was placed after the bov, the meter wouldnt register the escaping air and cause the momentary rich condition taht it does. Also, it wouldnt register the air escaping due to having a boost leak. Is there any drawbacks to this type of blow through setup?

other then no momentary richness which could blow your motor? no, its something simple that can be moved around, if you want to run a wire to a sparkplug to your exhaust that egnites when you change gears just run non blow thrugh, if you dont like running rich even for breaf moments, then run blow thrugh

You most likely need to run a different MAF and aftermarket enigne mangement, or a reprogrammed ECU. Most people switch to a MAP sensor readout using something like the HKS VPC or the AEM EMS engine management system that removes the MAF from the engine bay completely.

You just went totally off the subjcet. Not everyone wants to blow mad tyte flames like Fast and Furious. How does running rich blow a motor? Please indulge us.

You both are wrong. I found the info on a different forum. The people that run this setup I just mentioned have better throttle response with it on a turbo motor, simply because it measures the air right before the throttle body.

Ooo! Link?

Here ya go
 

Apparantly this setup eliminates alot of hesitation as well as the rich condition from venting bov's to atmos. Enjoy.

Link to this blow through setup

Re: Blow through MAF setup on sr20det.

I found it! Mustang 5.0 magazine, October 2003. Titled Mass Conclusion. Using a flow bench they tested various bends and straights before and after the maf to show the distortion. It is recommended that there be at least 8" in front of the maf to minimize distortion as well as 8" of tubing (curved or straight) behind the maf and before the throttle body. The bends dont matter behind it because the air has already been registered. If there is a bend in front of it you may use a pro-m Univer Plus maf housing which samples the air around the perimeter of the meter's inlet and then sends it down a spiral path calming and averaging it before being sampled.
They were also able to spin the maf in relation to the bend in front of it to reduce the distortion. Cooling fan wash in the engine bay also distorts the signal causing a rich condition so it is recommended that you shield the Maf and filter from it.

One of our customers did this on a Blacktop S13, said it was running rich, but better. The air going thru it will be under boost not vacuum, and will probably be hotter than the air on the intake side, don't know what difference this makes to the MAFS. Maybe being it's closer to the TB will make it adjust better to shifts when the TB closes. The only part of it I don't like is that the boost side of the piping will usually be a bit more dirty than the intake side, which can't be good for the MAFS.