Whats the deal? bovs bad for all turbo cars or what? - TriStateTuners.com :: Home of Tristate Auto Enthusiast

WRXD · 09-10-2006, 11:33 PM

A big debate in the Subie world is to bov or not to bov. The bov sounds cool and gives off that head turning turbo sneeze, but through being on the subie-centric boards for close to 3 years I have learned that it is universally understood that a atmostpheric bov hurts the performance of the WRX and the STi by not recirculating already registered air.

Now--- is this only for subies or what? I would imagine that basically a bov would work the same way on a dsm, evo, srt or any aftermarket turbo setup for that matter--- yet I never hear of dsm or srt people talking about how a bov will hurt performance.

So does a bov impede performance on ALL turbo cars or not? Somebody school me...

Turbo_CitrusEs · 09-10-2006, 11:39 PM

No a vta bov will only have an adverse effect on a car with a maf sensor. On cars that have a map sensor or speed density having a vta bov will not make any difference in performance.

Cypher · 09-10-2006, 11:41 PM

a BOV hurts performance if it is downstream from the MAF sensor which would be reading more air than isn't actually reaching the motor since you're venting causing the engine to run really rich. a recirculating BOV is a safe and effective way on cars with MAFs to have the BOV and not destroy performance. another way if you want to vent would be to have it upstream of the maf.

bottom line: A VENTING BOV on a car equipped with a maf that is venting air after registering it is BAD ON ALL TURBO CARS. hope that didn't get confusing. its getting late.

awdlaserbeam · 09-10-2006, 11:46 PM

When you have a BOV dumping into the atmosphere, that is air that is being blown out of your system instead of being recirculated...

**Ender81** · 09-11-2006, 12:04 AM

Yeah I came from VW's and it's the same issue with the 1.8t's. I'm not sure about all turbo cars though.

teh DIRT · 09-11-2006, 12:13 AM

its fine if you run a blow through maf.

MPowerKai · 09-11-2006, 09:56 AM

I ran an open atmosphere hks ssq on my vr4 before, it seemed ok.

RayArroyo · 09-11-2006, 10:02 AM

cars with map sensors can run open atmosphere!!!

201Motorsports · 09-11-2006, 10:15 AM

You can VTA with your MAF sensor if you like running rich between shifts and what not... don't do it on your MAF car... recirculate until you have a reason not to.

markley02 · 09-11-2006, 10:31 AM

So what would I have to do to my evo so I can VTA without running rich between shifts?

teh DIRT · 09-11-2006, 10:32 AM

Am I correct that a blow through maf will eliminate this problem?

RayArroyo · 09-11-2006, 10:34 AM

Quote:

Originally Posted by teh DIRT

Am I correct that a blow through maf will eliminate this problem?

depends

markley02 · 09-11-2006, 10:34 AM

I believe it would, but I think I remember reading that over 11 psi the maf will not read accuratly

teh DIRT · 09-11-2006, 10:34 AM

on what? where its placed?

RayArroyo · 09-11-2006, 10:41 AM

yes, if you run the maf after the bov you will be fine

teh DIRT · 09-11-2006, 10:43 AM

thats what i figured at thats what I will be doing. JBweld will work right?

just kidding.

RayArroyo · 09-11-2006, 10:44 AM

Quote:

Originally Posted by teh DIRT

thats what i figured at thats what I will be doing. JBweld will work right?

just kidding.

so will duct tape

SexyDSM95 · 09-11-2006, 10:47 AM

Quote:

Originally Posted by ray@turbotek

so will duct tape

...and zip ties

RayArroyo · 09-11-2006, 10:53 AM

and bubble gum

teh DIRT · 09-11-2006, 11:02 AM

ok thats enough. back to the topic at hand.

Dont know if it was explained already but a maf sees how much air is being injested then gives fuel according to that. If it sees air going in then that air excapes through a BOV, you run rich because the fuel is for all of that air, not just the air that didnt go out the BOV.

09-10-2006, 11:33 PM	#1
WRXD Tri-State Post Whore Join Date: Dec 2005 Location: SEPA Member #1156 My Ride: 2013 Ford Focus ST iTrader: (0)	Whats the deal? bovs bad for all turbo cars or what? A big debate in the Subie world is to bov or not to bov. The bov sounds cool and gives off that head turning turbo sneeze, but through being on the subie-centric boards for close to 3 years I have learned that it is universally understood that a atmostpheric bov hurts the performance of the WRX and the STi by not recirculating already registered air. Now--- is this only for subies or what? I would imagine that basically a bov would work the same way on a dsm, evo, srt or any aftermarket turbo setup for that matter--- yet I never hear of dsm or srt people talking about how a bov will hurt performance. So does a bov impede performance on ALL turbo cars or not? Somebody school me...

09-11-2006, 10:02 AM	#8
RayArroyo Tri-State Post Whore Join Date: Mar 2005 Location: ALBANY/PHILLY Member #205 My Ride: GTR/RSTI/MDX Sport iTrader: (3)	cars with map sensors can run open atmosphere!!! __________________ formerly ray@turbotek

09-11-2006, 10:31 AM	#10
markley02 Tri-State Post Whore Join Date: Apr 2005 Location: Mommy and Daddy’s House Member #390 My Ride: 05 Honda Odessey iTrader: (0)	So what would I have to do to my evo so I can VTA without running rich between shifts? __________________ Pwned Dumb ass for not changing my password. I lied about everything. All of it. I owned some great cars because my ex wife dedicated her life to me. I treated her like total sh, because my dk was more important in a back door than she was! She divorced me, and I deserved it! I am into drugs and Motorcycles, guns and especially my bff Brandon To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures. and girls that look just like my mother Pronouns: they, them. hyper-sexual narcissist. To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

09-11-2006, 10:34 AM	#13
markley02 Tri-State Post Whore Join Date: Apr 2005 Location: Mommy and Daddy’s House Member #390 My Ride: 05 Honda Odessey iTrader: (0)	I believe it would, but I think I remember reading that over 11 psi the maf will not read accuratly __________________ Pwned Dumb ass for not changing my password. I lied about everything. All of it. I owned some great cars because my ex wife dedicated her life to me. I treated her like total sh, because my dk was more important in a back door than she was! She divorced me, and I deserved it! I am into drugs and Motorcycles, guns and especially my bff Brandon To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures. and girls that look just like my mother Pronouns: they, them. hyper-sexual narcissist. To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

09-11-2006, 10:41 AM	#15
RayArroyo Tri-State Post Whore Join Date: Mar 2005 Location: ALBANY/PHILLY Member #205 My Ride: GTR/RSTI/MDX Sport iTrader: (3)	yes, if you run the maf after the bov you will be fine __________________ formerly ray@turbotek Last edited by RayArroyo; 09-11-2006 at 10:45 AM.

09-10-2006, 11:39 PM	#2
Turbo_CitrusEs Tri-State Addict Join Date: Jul 2005 Location: Pa Member #660 iTrader: (8)	No a vta bov will only have an adverse effect on a car with a maf sensor. On cars that have a map sensor or speed density having a vta bov will not make any difference in performance.

09-10-2006, 11:46 PM	#4
awdlaserbeam Tri-State Aficionado Join Date: Dec 2005 Member #1126 iTrader: (0)	When you have a BOV dumping into the atmosphere, that is air that is being blown out of your system instead of being recirculated...

09-11-2006, 10:15 AM	#9
201Motorsports Tri-State Post Whore Join Date: Jun 2006 Member #2125 My Ride: 2003 Mitsubishi Evolution 8 iTrader: (0)	You can VTA with your MAF sensor if you like running rich between shifts and what not... don't do it on your MAF car... recirculate until you have a reason not to.

09-11-2006, 10:53 AM	#19
RayArroyo Tri-State Post Whore Join Date: Mar 2005 Location: ALBANY/PHILLY Member #205 My Ride: GTR/RSTI/MDX Sport iTrader: (3)	and bubble gum __________________ formerly ray@turbotek

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