The truth about BOV's

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Nov 25, 2008 | 10:36 AM

#16

Sicks

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From: Charlestown, MD

Quote:

Originally Posted by gotrnet

based on my wideband which is pegged out on the rich side at 10.0 you can't tell on a stock car at stock boost levels. it just seems to stay pig rich longer than it does with the recirc bov on the car. as you turn up the boost it leans it out more through the rpm range and it does go back to pig rich once you get off the gas. can't say it does any "Harm" but it does make you much richer coming off throttle.

i actually run a tial 50mm and switched to a blow through setup to keep this from happening.

good info.

does anyone else notice richer AFRs on their wideband using a vta setup? what are the side effects of running rich longer after a shift? premature sparkplug fouling and hesitation at low rpms?

Nov 25, 2008 | 10:44 AM

#17

Mojito

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From: Moscow, Russia

You only run rich (if at all) between shifts, not after. Only when BOV blows, to be precise.

Nov 25, 2008 | 11:35 AM

#18

gotrnet

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From: Mud Hole, NC

Quote:

Originally Posted by Mojito

You only run rich (if at all) between shifts, not after. Only when BOV blows, to be precise.

Tech you run rich after the bov opens up maybe you shift maybe you don't. if you are driving hard and go quickly into the next gear you would never notice. but if you run it hard for a gear or part of a gear then don't get on it quickly after the bov opens and you shift (or don't) then you will see richer air fuel ratios for longer. if you are driving an untuned X then you definitely see rich A/F between shifts.

Nov 25, 2008 | 03:17 PM

#19

raytrix

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From: Chicago, IL

Quote:

Originally Posted by gotrnet

How can you see richer air fuel ratios? How can you feel the rich? Does the car rev hang between shifts? Does the rev drop immediately during a shift?

Nov 25, 2008 | 03:20 PM

#20

hellcat

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From: Houston Texas

Quote:

Originally Posted by raytrix

How can you see richer air fuel ratios? How can you feel the rich? Does the car rev hang between shifts? Does the rev drop immediately during a shift?

Maybe he has a wideband in his car like he should??

Nov 25, 2008 | 03:43 PM

#21

gotrnet

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From: Mud Hole, NC

Quote:

Originally Posted by raytrix

How can you see richer air fuel ratios? How can you feel the rich? Does the car rev hang between shifts? Does the rev drop immediately during a shift?

like i said in my orginal post, i have a wide band and it reads all the time so i can see air fuel at any point.

Nov 25, 2008 | 05:54 PM

#22

hurstnova350

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Joined: Mar 2007

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From: SoCal

solution: buy whatever BOV that you want, then set it up for recirc= no issues! Im getting the SSQV and people who have it recirc still have substantial BOV noise if thats what your looking for