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Old 08-16-2009, 01:02 PM   #1
Defiant Autospeed
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Default Intakes Do Not Cause A Cel, Bovs Dont Make You Run Rich

In 90% of cases, the above statements are true. Hopefully the fact that its in caps and is the thread title will get this noticed.

If your intake gives you a CEL, its either a poorly designed or BIG MAF intake (that you havent tuned for), or you did something wrong during the install.

A bov, will only give you a TINY temporary rich spot WHEN IT VENTS, it will not cause a constant rich condition, because when its closed, its closed. Just like stock. (unless it leaks, which wont cause you to run rich either)


The problems with intakes have largely been eliminated over the past several years, and BOVs, well, they never made you "run rich" to begin with.

Both are myths and misconceptions that for some reason after multiple FAQs and threads explaining things in detail, just wont go away.
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Old 08-16-2009, 02:02 PM   #2
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Air fuel ratio charts during bpv full-to-off throttle excursions?
Air fuel ratio charts during bov full-to-off throttle excursions?

thanks.....waiting.....I have no opinion either way (since BOV's cost money) but would like to see data so we can judge based on something real.

jack
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Old 08-16-2009, 02:05 PM   #3
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If I get an untuned intake that causes a lean condition and then a bov to make me run rich will it even out?
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Old 08-16-2009, 02:07 PM   #4
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This calls for another video.
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Old 08-16-2009, 02:15 PM   #5
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Quote:
Originally Posted by bjwk89 View Post
If I get an untuned intake that causes a lean condition and then a bov to make me run rich will it even out?
I hope you aren't serious. Short answer, no. Long answer, no.
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Old 08-16-2009, 04:28 PM   #6
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I hope you aren't serious. Short answer, no. Long answer, no.
I was joking .
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Old 08-16-2009, 04:34 PM   #7
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What BOV can make the best Pshshshshshhhhhhhhhh noise?
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Old 08-16-2009, 04:53 PM   #8
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Quote:
Originally Posted by Jack ffr1846 View Post
Air fuel ratio charts during bpv full-to-off throttle excursions?
Air fuel ratio charts during bov full-to-off throttle excursions?

thanks.....waiting.....I have no opinion either way (since BOV's cost money) but would like to see data so we can judge based on something real.

jack

Datalogs

It goes about .2 to .5 rich for 3 lines or less. And the log is sampling I want to say 4 times a second. So its under a second. For day to day driving, even hard driving, it makes no difference. Around a race track, only those with enough skill for there to be no other problems will see a difference. On the drag strip, again, 90% of people arent fast enough (driving wise) for it to matter.
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Old 08-16-2009, 04:53 PM   #9
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Quote:
Originally Posted by i_c_the_light View Post
I hope you aren't serious. Short answer, no. Long answer, no.

Dont laugh, we have seen that idea put out there. It was actually the title of a thread like 2 years ago
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Old 08-16-2009, 04:59 PM   #10
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Quote:
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What BOV can make the best Pshshshshshhhhhhhhhh noise?
click
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Old 08-16-2009, 05:01 PM   #11
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saved to favorites
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Old 08-16-2009, 06:06 PM   #12
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so Defiant, are you saying that really there is no harm running a bov?
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Old 08-16-2009, 06:26 PM   #13
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how can i get the turbo sound in my 2.5i? can i weld a BOV on my exhaust?




















lolwut
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Old 08-16-2009, 07:03 PM   #14
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DefiantAutospeed has made a defiant thread
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Old 08-17-2009, 01:11 AM   #15
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Defiant, what you say about intakes may be true for turbo cars, I have no idea.

However, there are a number of intakes available for the NA cars that will screw over the MAF badly enough to peg the A/F Learning and throw a CEL. There's a bigger number of intakes that will only cause about a 15% error, which isn't quite enough to trigger a CEL but is enough to cause other problems. An intake, any intake, without tuning is NOT a safe thing to do on a MAF-based NA.
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Old 08-17-2009, 01:27 AM   #16
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Quote:
Originally Posted by bjwk89 View Post
If I get an untuned intake that causes a lean condition and then a bov to make me run rich will it even out?
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Old 08-17-2009, 01:27 AM   #17
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I was joking .
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Old 08-17-2009, 01:28 AM   #18
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Originally Posted by lowrider89 View Post
so Defiant, are you saying that really there is no harm running a bov?

If it's functioning properly, then there will be no harm. I speak for Dave, because he pays me to do so. He doesn't yet know that he pays me for such assistance, but he will when he gets the bill....
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Old 08-17-2009, 02:08 PM   #19
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Quote:
Originally Posted by williaty View Post
Defiant, what you say about intakes may be true for turbo cars, I have no idea.

However, there are a number of intakes available for the NA cars that will screw over the MAF badly enough to peg the A/F Learning and throw a CEL. There's a bigger number of intakes that will only cause about a 15% error, which isn't quite enough to trigger a CEL but is enough to cause other problems. An intake, any intake, without tuning is NOT a safe thing to do on a MAF-based NA.
It is the same for the turbo cars. Dave's blanket statements just don't take into account the masses of older intakes that are still floating around on forum classifieds and Ebay that people buy and use. Here is a great blanket statement,don't use one unless you can verify it's not causing problems. Simple as that.............and that statement works for BOV's too.
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Old 08-17-2009, 02:16 PM   #20
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Originally Posted by Audiosavvy View Post
If it's functioning properly, then there will be no harm. I speak for Dave, because he pays me to do so. He doesn't yet know that he pays me for such assistance, but he will when he gets the bill....

ROFL
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