Looking at all these photos, I see lots of guys venting a BOV to the atmosphere. I am new to supra's, but on my last car (Mazda 323 GTX), I could vent the BOV with out it stalling out. Is that not the case on this car? Sorry if this has been answered before, I searched but didnt find anything useful. Thanks guys.
Venting a BOV
- Thread starter vanman
- Start date
The car will stumble/stutter/possible stall under some circumstances but you can learn to overcome it by blipping the throttle. The problem is most apparent when you're boosting then push the clutch in
as i read it the asnwer is yes, you can. and i don't understand why your 323 would stall if you tuned the BOV corectly.
if you are refuring to the stock BPV, the answer is NO! this may make a cool sound but not only will your car stall but it will be loosing already metered air and run rich[hence the stalling]
i hope this answers your question...if not let me know
john
if you are refuring to the stock BPV, the answer is NO! this may make a cool sound but not only will your car stall but it will be loosing already metered air and run rich[hence the stalling]
i hope this answers your question...if not let me know
john
my hks ssqv vents to atomsphere, all i get is the occansional backfire on shifts. Never had any problem stalling.
Ok, here's the deal.
On the Supra, the BOV is usually attached after the air flow meter. This means that any time the BOV opens, you are losing unmetered air, and your engine promptly runs very rich. Some people have had problems with it running so rich it stalls, more have had backfire issues.
There are three ways around this. In order of increasing cost, they are:
1. Live with it.
2. Route the BOV vent back into the intake after the air flow meter.
3. Move to a system that measures your air differently - like running a MAFT in blow through mode, or switching to a MAP sensor, etc.
On the Supra, the BOV is usually attached after the air flow meter. This means that any time the BOV opens, you are losing unmetered air, and your engine promptly runs very rich. Some people have had problems with it running so rich it stalls, more have had backfire issues.
There are three ways around this. In order of increasing cost, they are:
1. Live with it.
2. Route the BOV vent back into the intake after the air flow meter.
3. Move to a system that measures your air differently - like running a MAFT in blow through mode, or switching to a MAP sensor, etc.
while i agree with grim, i want to say my greddy type-S is vented to atmosphere and never eveer EVER stalls or backfires........
most bov's have problems due to pepl adjusting them incorrectly or not at all.............although a 17yr o;d car isn't the most consistant either, so i cannot speak on behalf of 'all' supras or cars for that matter
john
most bov's have problems due to pepl adjusting them incorrectly or not at all.............although a 17yr o;d car isn't the most consistant either, so i cannot speak on behalf of 'all' supras or cars for that matter
john
if its adjusted right the car wont stall,buck or hesitate. it may backfire once in a while, but if you have no cats and a straight thru muffler its pretty cool.
B
Blue Flame
Guest
sounds just like the BPV on my 200sx. it has to be plumbed back into the intake or it runs like crap. mine will actualy dieif its atmospheric. i have mine in the chargepipe and routed back to the intake before the turbo.vanman said:
yepp everyones got it.. as far as open atmosphere Blow Off Valves go some cars won't idle with them and other cars are fine.. the supra will idle low and it will die it you begin to boost then let off the torttle so you gotta keep reving it till it settles down. if your not running a maf your fine. if you are still running a maf sensor id keep it resurculating just because its easier. i found this out by playing with my stock bypass valve and plugging the line that goes to the acordian hose. it works but ehhh
This seems to be the same as the GTX. People seem to have the biggest problems when trying to vent a stock BPV or Bosch BPV to atmosphere, but few problems with aftermarket. The GTX actually uses the exact same stock BPV as the Supra, and I have heard rumors that it leaks really bad a idle. I have heard the same thing about the bosch valve, so maybe that explains it.
well that is your problem.........venting a "BPV" is bad thinking.....why? because it is not ment for that. a bypass is ment to recirculate
you are correct that it 'leaks'....but thats how it works. BPV's do not close entirely, that is why it has trouble when vented
recirculate or go BOV and adjust it properly, it' easy if your patient.
good luck,
john
you are correct that it 'leaks'....but thats how it works. BPV's do not close entirely, that is why it has trouble when vented
recirculate or go BOV and adjust it properly, it' easy if your patient.
good luck,
john