bitchin

 

bitchin

Thanks!

 

looks great for sure.

 

Were you recirculating the BOV when it was post MAF, or venting it to air? Setting it up the way you have it now solves the whole metered air going AWOL through the BOV and causing a intermittent rich condition, I bet. (nice looking job BTW)

 

I was venting to the atmosphere. The car ran fair but this is so much better. It's like night and day difference. And thanks! No more jerking, or stalling when pushing in the clutch after a hard pull or coming to a stop etc etc. I love it and recomend it to anyone thats FI.

Scott

 

The DSM / Subaru guys around here are great, and have educated me (some) on turboese. If you have the Maf before the BOV and vent to atmosphere, it throws the metering way off. I've been trying to figure out the best way to recirculate a BOV on a focus, but your idea is better.

 

"And to those of you with draw through MAF, change it to blow-thru and you WON'T believe the difference. Car is soooooooo!!! much smoother and runs clost to stock!"

Very cool focus guy! But... a correctly configured suck through setup will run just like stock when a proper bypass valve is used also. Still very nice though!

 

What is the difference between the two MAF??

 

"And to those of you with draw through MAF, change it to blow-thru and you WON'T believe the difference. Car is soooooooo!!! much smoother and runs clost to stock!"

Very cool focus guy! But... a correctly configured suck through setup will run just like stock when a proper bypass valve is used also. Still very nice though!

Very true Rod. I ran with a draw-thru and a bosch bypass and the car ran just close to as well as it does now.. BUT... I just had to have the sound of the BOV

Scott

 

What is the difference between the two MAF??

Nothing really.....just the location. Pro-M sells different styles for different uses but I have no idea what the difference is.

Scott

 

What did you have to change, tuning-wise, to run this setup versus suck through configuration? Or was it a matter of giving the mafs enough tubing before and after it to counter the effects of mafs turbulence? I'm very curious about this, because in the next few weeks I'll be tuning a similar setup on my own car. And is that a factory sensor in a bigger housing, just using the mafs multiplier?

Nick

 

This is definitely an interesting idea. I'm assuming this type of setup will work with a supercharger as long as the piping is there. The only thing I don't understand is how this will effect tuning. I'm assuming I'd need to go through it again.

 

Glad it works so well Scott

, I'm looking forward to see how its gonna work on mine

 

What did you have to change, tuning-wise, to run this setup versus suck through configuration? Or was it a matter of giving the mafs enough tubing before and after it to counter the effects of mafs turbulence? I'm very curious about this, because in the next few weeks I'll be tuning a similar setup on my own car. And is that a factory sensor in a bigger housing, just using the mafs multiplier?

Nick

Tuning wise, everything had to be changed. We just started from scratch again. Tom could give you way more detail than I can. No, its a pro-m cal. for the 42's, just in a piece of thin wall aluminum pipe.

And yes the straight pipe before and after is to help reduce turbulence.

 

What is the difference between the two MAF??

Suck through is before the turbo, the air is sucking through it

blow through is after the turbo, the turbo is blowing through it

hopefully that helps, if im right

 

What is the difference between the two MAF??

Suck through is before the turbo, the air is sucking through it

blow through is after the turbo, the turbo is blowing through it

hopefully that helps, if im right

Thanks...I never thought about the MAF being relocated on turbo install...I never paid attention.

 

Is that a Univer or a "blow thru in a pipe" as Pro-M calls it?

 

It's just a regular universal one just like everyone else uses. I built the pipe.

Scott

 

I'm confused, are you using a specific Pro-M sensor designed for blow-through applications? Or is the same sensor used in Pro-M's suck-through?

Where did you get the MAFS "bung" that you welded to the aluminum pipe?

How much did the sensor run ya?

 

Its just a regular old pro m. Nothing special. Not blo-thru specific. And the block with the radius cut in it I made. CNC'd from a solid block of aluminum,

Scott I

 

Sweet, thank you.

So the only real difference between a suck-through MAFS, and blow-through is tuning, and obviously sensor placement.

Awsome, I'll look into this. I think I recall Tom saying though, that it's much easier to tune a suck-though....