GM MAF+T / Recirculation Kit

[99GSX nooby]

im sure this was already talked about plenty of times. but as im reading thread after thread, im still confused about the problem i have in my car.

it doesnt happen often, but sometime when im shifting the car shuts off. it just stalls. i cant explain when, or what i do wrong, but i do know its everytime im in 3 - 5 gear.

i have an hks bov and im venting. i read somewhere that if i bought a gm maf+t that it would not have to buy a recirculation kit and it would fix this problem.

but jut a few nights ago i was told the gm maf+t was completely useless and i would still have a problem cause of my non recirculated bov.


can someone please clear this up for me please. below is a picture of my engine bay, hopefully it will show you guys what i got going on and what if the problem is not my bov or maf+t ..

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[thekellbeast]

I think you're a bit confused about the problem, the solution, and what people have been telling you.

What you have going on there right now, is a stock MAF with a non-recirculated BOV (venting). What's happening is that the bov vents off the metered air to the atmosphere, causing the car to run rich. Some cars can handle it fine, but a lof of the time it causes the engine to stumble. It seems that in your case the problem (if this is what's causing it) is manifesting itself as actually dropping the engine completely.

Now, how do we solve this? Well, you could get a recirculation kit. I don't know if one is available for that BOV or not. You could also get a different bov that can be recirculated. I'm running a stock 1g bov.

Now, if you really want to vent, what you need to do is set up your MAF in a blowthrough system. The stock MAF can't handle being pressurized, so people use the GM MAF, which can. You said you already have one, so what you need to do is to get an UICP that is set up to position it in between the BOV and the TB. Then get a plain intake pipe that just has a filter on it.

Whoever told you the MAF-t is useless doesn't know what they're talking about. The only way you could still have problems, is if you installed it in the factory location in a drawthrough setup. But who does that?

 

[Littlebeeper]

i think you have it in the stock location before the turbo. this location would be draw through and give you the same results as venting using the stock MAF. you would need to get some reducers to place the GM MAF right before the Throttle Body and after the BOV (usually as far away from each other as possible). you can get a filter to place where your stock filter is at and remove the stock MAF sensor, or you can skimp and leave the stock MAF with the filter but this would cause a restriction and a filter by itself would flow better.

MAF-T is NOT useless, specially on 1G's

 

[Talesin]

1G or 2G, a MAF-T is the only way to properly atmospheric-vent your BOV. A number of 2G guys will say otherwise, claim that venting doesn't affect the car, but dynos call them liars. Along with the puffs of black smoke and stalling.

Yes, there's a recirc kit available for the HKS SSQV. You take off the outer shell and replace the flat insert with a piped insert, reassemble, and recirc off the pipe sticking out the front.

The one down side is that many have had problems while running off the MAF-T, and generally it is seen as rather unpleasant to tune with. If you're just zeroing it out to use stock injectors and no tuning, just allowing more overall airflow to be metered and the BOV to be vented (when mounted in blowthrough mode) you shouldn't have a problem. But a complete tuning solution, it is not.

 

[Clay]

To vent properly you will need a GM-MAF and translator in blowthrough mode, GM-MAF is mounted between the throttle body and bov.

http://www.dsmtuners.com/forums/showthread.php?t=213196&highlight=maf+translator
http://dsmtuners.com/forums/showthread.php?t=231204&highlight=MAFT+Translator+to+vent

HKS Recirculation Kit. Various DSM vendors.
http://www.dsmparts.com/customer/product.php?productid=516
http://www.diamondstarmotorsport.com/evofmicparts.shtml

Non DSM vendor
http://www.intensepower.com/blowoffvalves.html

My suggestion is to buy the recirculation fitting or kit. The MAFT + Translator setup is very expensive if your decide to use the blowthrough mode.