I heard it is better to blow through your maf for more horsepower. However I don't see very many people doing this. Some can't I know. How is your setup?

 

There are 2 schools of thought on this. Some people say that since it is designed to work this way that it should stay this way. If it worked better after the turbo, they'd have put it there. The others say that placing it afer the turbo is beneficial. I'll list the reasons but it is up to you to decide which you would prefer.

AFM after the turbo. Only do this after the intercooler. That is alot of heat to run through the afm. Keeping it in front of the turbo gets rid of this risk.

There is an intake temperature sensor on the afm itself. Instead of normally recording outside temperatures and sendign those signals to the ecu, it is recording hot turbo air. The ecu will compensate differently because of this temperature issue. Thee is also another temperatreu sensor on the throttlebody elbow that records intake temperatures. This is supposed to record post turbo temperatures though. If you want tomove te afm after the intercooler, you should probably relocate the temperature sensor from the afm to the front side of the turbo. At least the ecu will still adjust for the proper temperature.

Another argument for the afm after the turbo is that it is less of a restriction here. Some peopel argue that a restiction in the system is still a restriction. This is true but with this argument one very important aspect is being overlooked. This comes in the form of boost. The air after the turbo is compressed. You have more air flowing through a smaller space. If you didn't, you wouldn't have boost. contrary to popular belief, a turbo does not speed up airflow. It slows it down. if you could measure the air speed at the inlet side of the turbo vs the outlet side, the inlet side would be faster. This is where the afm is stock. A restirction becomes greater with increased air speed or smaller with decreased air speed. Because of this, the afm is is less of a restriction after the turbo. Since the restriction is less and more air can get to the turbo faster, the turbo also spools up faster.

While in theory this all sounds good, there is no proof that it actually in practice works better. It "should". Also take into account that there are many aftermarket supercharger and turbo kits for different cars out thee. some place the maf or afm after the turbo and others before. It apparently works but to what extent is there an advantage is really questionable.

 

Thanks

 

I have mine after the turbo. It seems to run fine. The only problem is that black plastic cap is starting to pop off from the boost. I currently use a strut cap and a big hose clamp to hold it down.