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Forced Induction Forum Sponsored by Active Autowerke
Discuss supercharging, turbocharging and even nitrous and water injection here.
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Old 04-25-2012, 02:37 PM   #181
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I agree with Zak on this.
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Old 04-25-2012, 05:37 PM   #182
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Originally Posted by Zak@ActiveAutowerke View Post
.......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 ! ! !



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Old 04-25-2012, 06:55 PM   #183
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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....

Last edited by PEI330Ci; 04-25-2012 at 06:56 PM.
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Old 04-25-2012, 09:05 PM   #184
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Quote:
Originally Posted by Zak@ActiveAutowerke View Post
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

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I agree with Zak on this.


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

Rob


Quote:
Originally Posted by PEI330Ci View Post
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
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Old 04-25-2012, 09:19 PM   #185
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My buddy back in college used to vent his Greddy type s on his gs-t. Big flames.
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Old 04-26-2012, 09:46 AM   #186
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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
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Old 04-26-2012, 10:13 AM   #187
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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.
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Old 04-26-2012, 10:21 AM   #188
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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.
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Old 04-26-2012, 11:46 AM   #189
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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
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Old 04-26-2012, 12:52 PM   #190
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Sounds like a lot of belt noise.
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Old 04-26-2012, 01:12 PM   #191
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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.
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Old 04-26-2012, 01:35 PM   #192
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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

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Old 04-26-2012, 02:46 PM   #193
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I didn't know if Anthony could cut into the piping past the BOV and put the MAF in there. Just a thought.

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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.
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Old 04-26-2012, 03:14 PM   #194
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Sounds fine to me...and yes your cam sounds like it has a large cam when its cold.
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Old 04-26-2012, 03:33 PM   #195
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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.
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Old 04-26-2012, 03:46 PM   #196
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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.
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Old 04-26-2012, 04:58 PM   #197
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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
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Old 04-26-2012, 05:07 PM   #198
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Gotcha, makes sense.

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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.
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Old 04-26-2012, 11:35 PM   #199
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Talk to Zak a Few MINS ago! Answer alot of my Questions and finding out about some...

Thanks for the Help!

-Trip
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Old 04-27-2012, 12:54 AM   #200
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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.
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