BOV vs BYPASS PERFORMANCE

bransdaman78 · April 12th, 2007, 10:42 PM

Just got back from the strip, and I noticed something on the moderatly boosted turbo cars.... when their BOV's popd - their power seemed to drop way off and have to rebuild.... so I like the pop sound, however is a recirculating bypass going to make for a faster car, since presssurized air is re-routed through the system - meaning less of a boost drop inbetween shifts while racing?

This is what seems to be the case at the track, please discuss.

homebrewed · April 13th, 2007, 01:23 AM

Yes sir... I pretty much outlined exactly this in the other thread lol...

In a turbo car w/ an atmospheric BOV, if its not tuned properly, it causes a super rich scenario in between shifts.

I'm sure you know what the differances, besides the obvious, are between recirculating and atmospheric BOV's, so I'l spare ya...

ChrisJ · April 13th, 2007, 12:34 PM

You are releasing metered air when you go to the atmosphere if your car is not converted to blow through...Which means the MAF has already added the fuel for that air and you are letting it out...

My car's bov is not that loud...Which does not matter to me becuase my supercharger screams...

Just stay with the pull through and dont worry about the sound...

Just get a good reciculted set-up and you will be happy...

If you want I will have my Greddy Type-S bov WITH Flange set-up for recirculation for sale in like a week...Shoot me a PM if interested...

TurboLX · April 17th, 2007, 03:07 PM

Originally Posted by homebrewed

Yes sir... I pretty much outlined exactly this in the other thread lol...

In a turbo car w/ an atmospheric BOV, if its not tuned properly, it causes a super rich scenario in between shifts.

I'm sure you know what the differances, besides the obvious, are between recirculating and atmospheric BOV's, so I'l spare ya...

+1

banned · May 5th, 2007, 02:21 AM

right but the question is not about the richness of the various setups, its asking about losing boost with a s/c car as opposed to maybe keeping some of it with a closed loop system. the fuel factor is obvious. however i would think the s/c with a bov would be slower because the s/c probly wont rebuild that boost as quickly as a turbo car would.

TurboLX · May 5th, 2007, 10:20 AM

how so? the BOV activates when the throttle shuts closed so its not pushing that un-used boost back to the turbo or S/C

banned · May 5th, 2007, 12:17 PM

right the bov would release it where the bypass would dump it back into the system (altough with some loss). wouldnt the bypass setups allow the s/c car to maintain or at least build boost a little faster than what a bov'd car would with a supercharger

StangAddiction · May 5th, 2007, 12:29 PM

Originally Posted by TurboLX

Originally Posted by homebrewed

Yes sir... I pretty much outlined exactly this in the other thread lol...

In a turbo car w/ an atmospheric BOV, if its not tuned properly, it causes a super rich scenario in between shifts.

I'm sure you know what the differances, besides the obvious, are between recirculating and atmospheric BOV's, so I'l spare ya...

+1

+1

This is why most turbo cars with BOVs have flames comeing out the tailpipe. The rich scenario causes unburned fuel to excape into the exhuast where the heat ignites it as it flows out back.

TurboLX · May 7th, 2007, 09:51 AM

how can it build more boost on a supercharger if its running all the time? thats why they call it a blower, it only blows so much air and Stang, i love the flames that shoot out my exhaust, yea it can be bad, but its cool

banned · May 8th, 2007, 05:54 PM

you guys are not following me

TurboLX · May 9th, 2007, 05:14 PM

well i guess not, explain with detail

April 12th, 2007, 10:42 PM	#1
bransdaman78 Regular Join Date: Mar 2007 Posts: 453	BOV vs BYPASS PERFORMANCE Just got back from the strip, and I noticed something on the moderatly boosted turbo cars.... when their BOV's popd - their power seemed to drop way off and have to rebuild.... so I like the pop sound, however is a recirculating bypass going to make for a faster car, since presssurized air is re-routed through the system - meaning less of a boost drop inbetween shifts while racing? This is what seems to be the case at the track, please discuss. __________________ 03 GT leather seats for sale or trade for racing seats, Looking to buy: subframes, tower braces, control arms, bypass/BOV, 42# injectors & MAF Trade/ Sell Predator 4 SCT (wrong part of the country)

April 13th, 2007, 12:34 PM	#3
ChrisJ MM Ninjas! 2002 Mustang GT SLOW Join Date: Jun 2006 Location: Williamsburg, Virginia Posts: 14,743	You are releasing metered air when you go to the atmosphere if your car is not converted to blow through...Which means the MAF has already added the fuel for that air and you are letting it out... My car's bov is not that loud...Which does not matter to me becuase my supercharger screams... Just stay with the pull through and dont worry about the sound... Just get a good reciculted set-up and you will be happy... If you want I will have my Greddy Type-S bov WITH Flange set-up for recirculation for sale in like a week...Shoot me a PM if interested... __________________ My Junk www.myspace.com/cjobe

May 5th, 2007, 02:21 AM	#5
banned Regular Join Date: May 2007 Posts: 440	right but the question is not about the richness of the various setups, its asking about losing boost with a s/c car as opposed to maybe keeping some of it with a closed loop system. the fuel factor is obvious. however i would think the s/c with a bov would be slower because the s/c probly wont rebuild that boost as quickly as a turbo car would. __________________ Considering selling my car to fund my race car: take a look and tell me what you think. http://www.moddedmustangs.com/forums...ml#post1041280

May 5th, 2007, 10:20 AM	#6
TurboLX Site Moderator 1990 Mustang LX Turbo 8.67@165.91 mph Join Date: Oct 2006 Location: Hidden In NY Posts: 8,261	how so? the BOV activates when the throttle shuts closed so its not pushing that un-used boost back to the turbo or S/C __________________ Wiring Diagrams, TSB's, OBD Service Codes and Engine Diagrams Available. PM For Info Myspace

May 5th, 2007, 12:17 PM	#7
banned Regular Join Date: May 2007 Posts: 440	right the bov would release it where the bypass would dump it back into the system (altough with some loss). wouldnt the bypass setups allow the s/c car to maintain or at least build boost a little faster than what a bov'd car would with a supercharger __________________ Considering selling my car to fund my race car: take a look and tell me what you think. http://www.moddedmustangs.com/forums...ml#post1041280

May 7th, 2007, 09:51 AM	#9
TurboLX Site Moderator 1990 Mustang LX Turbo 8.67@165.91 mph Join Date: Oct 2006 Location: Hidden In NY Posts: 8,261	how can it build more boost on a supercharger if its running all the time? thats why they call it a blower, it only blows so much air and Stang, i love the flames that shoot out my exhaust, yea it can be bad, but its cool __________________ Wiring Diagrams, TSB's, OBD Service Codes and Engine Diagrams Available. PM For Info Myspace

May 8th, 2007, 05:54 PM	#10
banned Regular Join Date: May 2007 Posts: 440	you guys are not following me __________________ Considering selling my car to fund my race car: take a look and tell me what you think. http://www.moddedmustangs.com/forums...ml#post1041280

May 9th, 2007, 05:14 PM	#11
TurboLX Site Moderator 1990 Mustang LX Turbo 8.67@165.91 mph Join Date: Oct 2006 Location: Hidden In NY Posts: 8,261	well i guess not, explain with detail __________________ Wiring Diagrams, TSB's, OBD Service Codes and Engine Diagrams Available. PM For Info Myspace

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