.::|Active Autowerkes Stage "TrippinBimmer" 330i ZHP Supercharged Street/Show Car|::.

I agree with Zak on this.

Originally Posted by Zak@ActiveAutowerke

.......You may shoot some flames on WOT shifts.

Trip, I will fly to your location to video "FLAMES" coming out the back of your Bimmer ! That would be........Awesome ! ! !



Rob

I hate to say it, but that BOV is the wrong part for a "draw through" MAF setup. If the sequence was Compressor - BOV - MAF - Engine, then there's be no problem. But as Zak said, you'll now have an engine that thinks a lot more air is being pushed into it than really is the case, and this is going to cause some really rich running at part throttle and upper RPMs.

If you have cats, it will likely kill them fast as well.

Turbos don't suffer as much when configured like this, because mass flow is controlled my manifold pressure/vacuum. With a SC, mass flow is directly proportional to engine speed...which means at 5000 RPM @ light throttle the compressor will be running pushing a ton of air through the BOV.

Ever wonder why the S65 supercharger kits have 2-3 BOVs? It's because of the mass flow that needs to be bypassed at part throttle. They are also tuned completely differently than this kit.

Sorry to deliver the bad news like this....

Originally Posted by Zak@ActiveAutowerke

Your MAF is positioned in front of the blower which is before the BOV. Once the air runs past the MAF it sends a signal telling the DME you have XX/mass of air going in to the engine. When the BOV vents to atmosphere your motor no longer has that much air going towards it and it will run rich. You may shoot some flames on WOT shifts.

Thanks for the info

Originally Posted by BMW_Knight

I agree with Zak on this.

Originally Posted by Rob43

Trip, I will fly to your location to video "FLAMES" coming out the back of your Bimmer ! That would be........Awesome ! ! !

Rob

Originally Posted by PEI330Ci

I hate to say it, but that BOV is the wrong part for a "draw through" MAF setup. If the sequence was Compressor - BOV - MAF - Engine, then there's be no problem. But as Zak said, you'll now have an engine that thinks a lot more air is being pushed into it than really is the case, and this is going to cause some really rich running at part throttle and upper RPMs.

If you have cats, it will likely kill them fast as well.

Turbos don't suffer as much when configured like this, because mass flow is controlled my manifold pressure/vacuum. With a SC, mass flow is directly proportional to engine speed...which means at 5000 RPM @ light throttle the compressor will be running pushing a ton of air through the BOV.

Ever wonder why the S65 supercharger kits have 2-3 BOVs? It's because of the mass flow that needs to be bypassed at part throttle. They are also tuned completely differently than this kit.

Sorry to deliver the bad news like this....

I found out today after Starting it up for the First Time Surging Idle I am running -6psi Spring ATM. I am going to try to swap it out for a Tial QR BOV -3psi and go from there.

-Trip

My buddy back in college used to vent his Greddy type s on his gs-t. Big flames.

I emailed ATP and order a TiAl QR Valve with -3psi spring and will be returning the Q. I guess, I can give up the WHOOSH noises. ;D

-Trip

the active valve sounds pretty decent...

You need a standard push valve. The tial is going to try and close at idle, all of their models are based on the same action. A push valve will let pressure bleed, which a little is needed when the throttle body is closed.

I'm sure you already know this. AA kit makes your car sounds completely different at all times. It sounds like something insane has been done to it. You can hear the valve bypassing the whole time and you should, the tial valve might take away that hiss.

Is there really no way to move the MAF to after the BOV? DSM guys used to install a GM blowthrough after the BOV and very close to the throttle body.

Installed the AA BOV and Crank up the Car. When I rev to 5k I can here the BOV Hissss...



Also, is that how my exhaust suppose to sound? Like I have a Cammed Engine

-Trip

Sounds like a lot of belt noise.

No sound on my comp at work, so I can't watch the vid

On flat shifts you'll definitely spit some fire. My car used to catch the rear end on fire on high RPM lifts.

Brady, the only person running a blow-through setup on an e46 nonm is NickG. I believe he uses a Ford maf that's been calibrated appropriately.

I thought bov's were mainly for Turbo's... is that not correct? cause i would love to have the sound of bov! I have astratmosphere (i think thats what it's called) aluminum bypass, and it works awesome! It almost sounds like a quieter bov.... almost

I didn't know if Anthony could cut into the piping past the BOV and put the MAF in there. Just a thought.

Originally Posted by Activ3

No sound on my comp at work, so I can't watch the vid

On flat shifts you'll definitely spit some fire. My car used to catch the rear end on fire on high RPM lifts.

Brady, the only person running a blow-through setup on an e46 nonm is NickG. I believe he uses a Ford maf that's been calibrated appropriately.

Sounds fine to me...and yes your cam sounds like it has a large cam when its cold.

Originally Posted by TrippinBimmer

I emailed ATP and order a TiAl QR Valve with -3psi spring and will be returning the Q. I guess, I can give up the WHOOSH noises. ;D

-Trip

I sounds fine, and you will still have a woosh noise. Have you driven it yet?

It should woosh like crazy on shifts. Its blowing straight back into the snail pipe.

Originally Posted by aggieE46

I didn't know if Anthony could cut into the piping past the BOV and put the MAF in there. Just a thought.

You can't blow through the OEM maf. It isn't designed to handle any sort of oil, plus you'd need a different tune. When you blow through the maf, it would effectively have to measure pressurized air, where as the draw through setup does not.

Question for David, BMWKnight and JoshZHP. When the car is running does your mechanical tensioner moves around? Mines move alittle not sure this is acceptable...

-Trip

Gotcha, makes sense.

Originally Posted by Activ3

You can't blow through the OEM maf. It isn't designed to handle any sort of oil, plus you'd need a different tune. When you blow through the maf, it would effectively have to measure pressurized air, where as the draw through setup does not.

Talk to Zak a Few MINS ago! Answer alot of my Questions and finding out about some...

Thanks for the Help!

-Trip

Originally Posted by TrippinBimmer

Question for David, BMWKnight and JoshZHP. When the car is running does your mechanical tensioner moves around? Mines move alittle not sure this is acceptable...

-Trip

Mine has a little play, but not enough to cause any strange noises.