"The BIG BOV thread" (Where all bov question threads get merged) - Page 494
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This is a discussion on "The BIG BOV thread" (Where all bov question threads get merged) within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; bye...

  1. #7396
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    bye
    Last edited by Weasel 555; 08-25-2006 at 09:00 AM.

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  3. #7397
    Registered User afbluesv1k's Avatar
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    Worx DS2 has treated me well for the past few months, but the vanity has worn off of it going Psssssstttt!!!!!! Cant hear much with the catless DP on the car now. I am willing to sell it if you want to try it.

  4. #7398
    Registered User wrx wagone's Avatar
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    Quote Originally Posted by Trainrex
    And to think you have the reputation of knowing how to use them.
    I bet you say that to all the boys...
    This message printed on 100% recycled electrons.

  5. #7399
    Registered User VXSS's Avatar
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    Quote Originally Posted by VIN_DIESEL
    I have had GFB Hybrid BOV for over a year now and i have experienced no ill side effects.
    Unless side effects include 'pppssshhhhhhttt"!

    gary noonan | senior artist | animator
    Bethesda Game Studios

  6. #7400
    Administrator Trainrex's Avatar
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    Quote Originally Posted by wrx wagone
    I bet you say that to all the boys...
    Yeah, but it never works.

  7. #7401
    Registered User Kreeker's Avatar
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    Can someone explain to me why they are harmful? And if they are harmful, in what setups should they be used?

  8. #7402
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    I can explain this! I'm new to this board not new to Subies. Ok so lets say a pound of air gets sucked into your intake. Your mass airflow sensor accounts for that pound and says hey I will tell the ECU I just let a pound of air by. Mr. ECU says hey we need the correct amount of fuel to mix with that pound of air so the ECU orders up some fuel. This is the start of you cars A/F ratio calculations. So the air makes it's way through the turbo gets compressed then cooled in the intercooler. Now the pound of air you had is ready to go through Miss throttlebody like a champ. So she chokes half that pound of air down her non-port and polished throat just as you let off the accellerator. Hmm we still have all that pressure! So the fluffer little BPV sends the compressed air back through the intake after the Mass air flow sensor since the ECU has already calculated for the air and we don't want the car to run richer than it already is! In choose your ending part 2 the cool sounding jock of a BOV sends the air that was already calculated for into the air which gives you a rich condition and that cool PSSSSHHHTTT! sound! If you are running a larger intercooler or a bigger turbo than stock your local tuner can tune for a BOV. Have fun and yeah I'm not responsible for the gramatical errors my fingers make!!

  9. #7403
    Registered User Jackal's Avatar
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    Quote Originally Posted by BomberMonkey
    I can explain this! I'm new to this board not new to Subies. Ok so lets say a pound of air gets sucked into your intake. Your mass airflow sensor accounts for that pound and says hey I will tell the ECU I just let a pound of air by. Mr. ECU says hey we need the correct amount of fuel to mix with that pound of air so the ECU orders up some fuel. This is the start of you cars A/F ratio calculations. So the air makes it's way through the turbo gets compressed then cooled in the intercooler. Now the pound of air you had is ready to go through Miss throttlebody like a champ. So she chokes half that pound of air down her non-port and polished throat just as you let off the accellerator. Hmm we still have all that pressure! So the fluffer little BPV sends the compressed air back through the intake after the Mass air flow sensor since the ECU has already calculated for the air and we don't want the car to run richer than it already is! In choose your ending part 2 the cool sounding jock of a BOV sends the air that was already calculated for into the air which gives you a rich condition and that cool PSSSSHHHTTT! sound! If you are running a larger intercooler or a bigger turbo than stock your local tuner can tune for a BOV. Have fun and yeah I'm not responsible for the gramatical errors my fingers make!!
    Wow BomberMonkey, are you a elementary school teacher? It's sounded like you were trying to explain it to a 5 year old. Not saying that it's wrong, just funny...
    Looks are everything...

  10. #7404
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    I like to break stuff down! I'm actually a Bombtech in the AF!

  11. #7405
    Registered User Newera09's Avatar
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    instead of wasting forum thread space i fgured id ask here. Would it then be safe then to buy like a Greddy recirculating bov? or would that be just as bad as venting into the atmosphere?
    New England F4

    Turbo XS Bov FS/Trade (HKS sequential)

  12. #7406
    Registered User duckstu's Avatar
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    Any aftermarket recirc BOV does the same as the stock one (which itself is recirculating).

    At about 20 lbs of boost and higher, the stocker starts to leak boost. I am running 22 lbs currently. So I may benefit from an aftermarket one.

    If you are at 20 lbs or under,...there is no need for an aftermarket one. (except for looks of course).

    The aftermarket ones also close quicker because of their stiffer springs (so I hear). Doubt the change in closing speed will translate to any noticable difference in time-to-boost after a shift though.

    The ones that vent to atmosphere are the ones that may cause trouble for the engine. The air that they are venting to atmosphere has already passed through the maf sensor in your intake pipe, and as such, the computer has already calculated the proper amount of fuel to account for it. When the atmos BOV vents boost, the air goes out of the system, but the fuel still goes in. The car runs very rich for a moment (durring shifts mostly). This causes some more black smoke, and can at higher venting levels, the extra fuel can wash too much oil off the cylinder walls, causing the piston to run dry for a moment. On a very hot engine (just comming off high boost an instant earlier and about to back to high boost in a 1/2 second) this can damage the cylinder walls and cause the car to start burning oil. (Ever see a modded import with a super loud 4" exhaust tip blowing blue smoke?)

    I just sold my 1991 E31 and am trying to sell my E36. Do you have an Alpina?
    If you don't blow it up once in a while,.....there's more power left in it.

  13. #7407
    Registered User duckstu's Avatar
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    P.S. The fuel washing problem is why the dual port BOV's are now popular. They have 2 vents,...one to atmosphere and one that recirculates. This allows the young boost junkie to send just enough of the venting boost to atmosphere to make that cool "wooshing" noise, but still have the majority of the venting gasses recirculate back into the engine to keep the cylinders and any catilytic converters happy.
    If you don't blow it up once in a while,.....there's more power left in it.

  14. #7408
    Registered User Newera09's Avatar
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    Thanks for the help bro. No I dont have an alpina, although at first my plans were to see how many alpina parts I could put on this thing. Then I graduated got a very good job and gauged interest in another turbo car. So here I am researching parts for an '04-'05 which I will be purchasing within the following weeks.

    Do you have a link to 1 or 2 good recirculating BOVs that you would recommend. I thought about getting one of the turbo xs ones which I heard were easy to install but I figure I'd run something with the cool swoosh sound that was also safe for the car. Not having the bov sound go off is like missing the cum shot in a porno, sure its not needed but it sure adds the finishing touch...
    Last edited by Newera09; 08-30-2006 at 07:09 AM.
    New England F4

    Turbo XS Bov FS/Trade (HKS sequential)

  15. #7409
    Registered User duckstu's Avatar
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    Word!

    Here's a link to the dual port version of the one I'm expecting to recieve in the mail today. The link to the one I bought is a few posts ablve.

    http://www.rallysportdirect.com/shop...b674c53368ff46

    My E36 is a 1994 325is sport package car, which I'm selling. Did about everything. Bilsteins, Eibachs, chassis braces, chip, supersprint exhaust, pulleys, shifter, E46 front brakes, SS lines, wheels and tires, etc. Goes like stink on the track. Bought a used supercharger kit for it but never got around to installing it.

    Wish you well in your search for the Suby. I bought my 04 STI with 8K in mods (all done by Easy Street in California), for 20 G's a few weeks ago. 48,000 miles on it. An older gentelman owned it. Had the big intercooler, HKS headers, 18G turbo, downpipe, ECUTech computer tuning, big injectors, big fuel pump, cold air intake, pyro and boost guages, etc. He had removed the coilovers and rear exh as they were too loud and harsh. Fast as stink when I got it and will be even faster soon.

    The thing's a riot!
    If you don't blow it up once in a while,.....there's more power left in it.

  16. #7410
    Registered User handyrs's Avatar
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    Quote Originally Posted by BrianH
    step #1 don't listen to sales people.
    sales people are only out there for one thing, to make money. so of course they're goin to tell u what u want to hear.

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