y not to vent to the atmosphere

[v-dubed]

ehh im starting to get annoyed with all the same questions... should i vent to the atmoshpere with a bov... the answer is no!!!! all due to one little thing... called a maf... ok now onto y u cant run one... the maf is gives u real time a/f.. in conjuction with the 02 sencor.... now air goes throught the maf and tell the injectors how much juice to squirt.... so that value is now locked in.. ok here is the stupid part... the bov is located after the maf.... so when u blow off... u are blowing off metered air... and the motor dosent know u are blowing that metered air off... hence the air was allready metered earlier on in intke track... and u dump more fuel then needed.. when switching gears.. now ruff idle can be fixed.... it idles like crap bc the valve is cracked open at idle from the vac nipple... maken u run fat rich at idle... it can be fixed with making the spring stiffer or an adjusment screw... now dont get me wrong... some people have had success in running a bov....but its like 98% of the time it will run like crap...

now their are a couple ways u can run a bov without running rich... one is unplugging the maf... only thing i dont like about this is u run off a base map... and those are pritty crappy... and u through a check engine, asr, and a epc light... the other way is to place the maf after the bov... i was going to do this b4 i went standalone... but it requires extenchion of the wires...


some other stuff.... some of u are thinking... but nissans and evos and sti's run bov's and have mafs.... well in short... they do run like crap... but they have the abbility to run a piggy back... we cant... ive ridden in many turbo nissans and evos and they do stall out at stop signs... and if u look at their spark plugs their pritty dark lookin...

got any questions just ask

i love u

[noR]

Hey man, did you ever get that big turbo setup to work w/that standalone management sys? I know you were workin' on it, what happened?

[v-dubed]

umm i had everything on...without the standalone... and i ran like total crap... so i took it off and like i ran out of funds... i had standalone wired in... but i kept breaking parts... and messin up the car... so i sold the car.. and bought a s2000... but im building another beetle... i have some big plans

[Billsbug]

Originally Posted by v-dubed

but im building another beetle... i have some big plans

[v-dubed]

i misss 20 valves

[BoostedOne]

Pretty good write up, and what many need to see!
But, there is one minor discrepancy. At idle, running a BOV makes you run lean. Reason is, because as you say the valve is DS of the MAF and the turbo, but at idle there is vacuum in the intercooler piping not boost. So at idle, when the valve is cracked open there will be air ENTERING the valve, meaning you are letting unmetered air into the system, meaning the MAF is not measuring some of the air. It may end up running rich if the ECU is using the O2s and fuel trims to try to compensate, but that would be a response of the system responding to the lean condition.
As for blowing off metered air, I must admit I am somewhat suprised. Most vehicles have decel injector cutout, meaning the injectors shut off on decel. Thats why most MAF equipped cars can get away with running a vented BOV once the idle situation is taken care of, because at idle its closed, and when you let off at boost the decel injector cutoff comes into effect meaning no matter what the MAF sees the injectors are closed.
Where it becomes a little goofy(most other vehicles) is at cruise, when you are rolling on and off the throttle and the engine goes slightly in boost, then into vacuum, over and over.

But yeah, even with my short time in this forum I can see this should almost be made a sticky

[v-dubed]

umm i have to say no on that one... cuz i was running low 10 a/f at idle....