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Old 08-31-2001, 02:33 AM   #1
Teamugi
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Default BOV and ECU question

I got a blow off valve that can either vent 100% into the atmosphere. Or have it blow 50% into the air and 50% re-circulating, like the stock BOVs do. Now I have heard that venting the BOVs will make the car run richer, right? So if you reset the ECu after you put in the new BOV, will the ECU be able to learn to compensate for it? just curious. Runing rich would not be devasting to the engine or exhaust system right?

Also when I install the BOV are there any things I should do, other than follow instructions and cool the engine? the bolts that hold the stock BOVs don't need to be torqued a specific amount right? Thanks for any help for a newbie. I just want this to be done right and with little hassles.
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Old 08-31-2001, 01:21 PM   #2
subywrxwrblu
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yes is would like to know this to, i have a TurboXS BOV on the way
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Old 09-01-2001, 02:24 AM   #3
Teamugi
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anyone?
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Old 09-01-2001, 03:27 AM   #4
Austin
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First off, the stock BOV is 100% recirc. Vents straight back to the intake.

After you put your new BOV on, resetting the ECU won't do jack for you. Your ECU will still see how much air you're drawing from the MAF, and will inject fuel accordingly. When you vent any air to atmosphere, you're losing air that's already been metered and for which fuel has been injected. This will cause A/F ratio to go up - more rich.

As far as how the car will run, I haven't read any bad reports from going 50/50. Some people complain about problems running 100% vent to atmosphere, some people say they run fine w/100% vent. YMMV
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Old 09-01-2001, 04:11 AM   #5
Tuning Factory Inc.
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I have been running the Blitz one for about 10,000 miles now. No problems at all. As for the rich condition I'm not sure if people are just saying this due to theory but have you ever measured AF mixtures when you shift? You go dead lean since your ECU sense no throttle input. Even if it does run a tad bit richer at that particular moment, it really doesn't affect anything whatsoever. If you like the sound go for it.
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Old 09-01-2001, 10:38 AM   #6
Teamugi
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thansk for the responses. i will probably do the 50/50 setup. But then again I might enjoy the sound too much and decide to vent 100%.
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Old 09-01-2001, 10:38 PM   #7
Jon [in CT]
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God wrote: "As for the rich condition I'm not sure if people are just saying this due to theory but have you ever measured AF mixtures when you shift? You go dead lean since your ECU sense no throttle input."

God, have you ever measured "AF mixtures" when you shift? I'm certain you haven't but thanks anyhow for an especially hairbrained theory: "You go dead lean since your ECU sense no throttle input."
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Old 09-02-2001, 11:09 PM   #8
Teamugi
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so basically I shouldn't worry about resetting the ECU?
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Old 09-02-2001, 11:25 PM   #9
Austin
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Quote:
so basically I shouldn't worry about resetting the ECU?
correct
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Old 09-03-2001, 01:17 AM   #10
neurotic
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I just ordered the MRT BOV and I plan to run it 50/50 as well. I am concerned it will still run a little bit rich, but I guess I will find out when it gets here. Dan at Vivid has one installed on his WRX I believe, and he doesn't seem to have any problems.
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Old 09-03-2001, 02:05 AM   #11
Teamugi
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cool neurotic, i also ordered one from Dan. What color did you get? Let me know how the install goes. That is if you get it first. can't wait to make some more noise with the BOV.
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