Mazda_Powered's 91 Protege LX

[Damkid]

Basically when the BOV releases the surge of air, it's technically releasing "metered" air so the computer is putting out the fuel for all the metered air and when it gets released into the atmosphere, it'll run rich for a split second in between shifts, becuause its missing the air thats been metered and by re-circulating it, it keeps it from running rich in between shifts since its not loosing metered air

[bomdoutscort]

really? do they have a wideband at all? Because I've been told up and down by god knows how many ppl that running an ECU/VAF system that's meant to see that metered air re-enter the intake system, will cause some erratic a/f ratios during shifting if vented, so I didn't want that to possibly foreshadow a lean condition.

I know all OEM turbocharged cars come with a bypass valve, and not a blow off valve for a reason...doubt they just did that for noise control lol...

I've been in a recirculated car with a wideband and it did the same thing with the readings as an atmospheric bov

[Mazda_Powered]

Basically when the BOV releases the surge of air, it's technically releasing "metered" air so the computer is putting out the fuel for all the metered air and when it gets released into the atmosphere, it'll run rich for a split second in between shifts, becuause its missing the air thats been metered and by re-circulating it, it keeps it from running rich in between shifts since its not loosing metered air

thank you sir!

I've been in a recirculated car with a wideband and it did the same thing with the readings as an atmospheric bov

both running oem bp26 setups? Mine's more or less stock asides the fmic kit and misc that goes along with that...I still find that extremely odd that both do the same thing lol, not calling BS tho Shawn, just sayin' it's weird ****!

Idk, maybe FE3-323 can chime in here too, I know he enjoys a good bypass valves over BOVs story lol...I can't be the only one who wants things hooked up the way they're meant to be!!

If I was on MS I'd still probably still recirc tho lol, I like going that extra step sometimes, plus like I said, I don't want this loud ass piece that'll scare even me on the earliest of mornings haha.

[mazda1993]

Well i don't have a wideband, only a a/f guage ****, and i run a blitz supersound bov and its fantastic haha

[89BG 323]

i think that damkid's explanation is spectacular, and makes perfect sense. however, i think that the bypass/blowoff thing kinda comes down to personal preference.

[Mazda_Powered]

In the end it must lol

received the rest of my 4mm silicone vacuum hose today, so now I can hook said BOV to a vac source lol *thumbs up*

Weather's been kinda crappy here, so haven't made much progress on the car. I still have to finish mounting a rear battery tray, thinking about using the stock one since the aftermarket kit I have is for a much taller battery

[Wilyb]

i think that damkid's explanation is spectacular, and makes perfect sense. however, i think that the bypass/blowoff thing kinda comes down to personal preference.

Yep... I agree... just one thing though... he misspelled the word losing... ban 'im

[concealer404]

Vented to atmosphere works on some cars, but not on others. It's not "supposed" to work on my MX6, but it does. Doesn't work for some other people.

The difference is that aftermarket units work differently and are way faster than stock units vented. So it's not a big deal.

[FE3-323]

I preferr to have the air injested (reinvested) persay back into the mix.
OE setups like to glitch a bit because the air lost to atmosphere BOV's is then unaccounted for by the ECU.

recirculated BOV's remove this issue^^ & also retain the pressurized air into the mix. Making the most efficient use of the air is important to me i guess. short of that it quiets it only slightly. but that little bit helps when you don't like hearing the noise every damn shift.

[89BG 323]

yeah i can see how it would get old. kinda like whiney superchargers. but then again, thats probably part of the reason that boosted cars dont generally see daily use year round.

[bomdoutscort]

yeah i can see how it would get old. kinda like whiney superchargers. but then again, thats probably part of the reason that boosted cars dont generally see daily use year round.

If your not really getting into boost, then you really don't hear the bov.

[SgtRauksauff]

When I cobbled my wagon together, the piping I used didn't have the connection to route the air back in, so the OEM bypass valve vented right to atmosphere.

SUPER rich, almost sounded like an Anti-Lag system sometimes, it was pretty cool. Puffs of black smoke every shift when under power, too.

Then I thought I'd be silly, and put a duck call on the BPV. turns out, the duck call acted as a check-valve, and stopped the vacuum leak of the BPV that I never knew I even had. cleaned up mpg, stopped smoking on upshifts under power, idled better, and just ran better overall.

--sarge

[Mazda_Powered]

duck caller to the rescue! haha, awesome story Sarge, thanks.

[PhatnackyOne]

One cool outcome of running an open atmosphere BOV is the potential to spit fireballs between shifts. lol

[Mazda_Powered]

well got some nice weather for a few hours today, now it's hardcore overcast lol, so I mustered up energy and went ahead and cut my Protege bumper where I had it taped off, then started switching the bumper...











It's lining up perfectly on the right side wheel well arch (pass side), and needs to be shifted to the left about 1/4" then it'll line up with the left arch perfectly, then I can start plastic welding the sucker together lol.

the intercooler mounts has about 3/8" before it touches the bumper, so it's in a perfect spot. This way I can fab a piece to cover up any gaps under the bumper and nothing hangs down.