Atmospheric Blow off Valves - good or bad?
Discussion
I've been reading up a bit about Blow off valves. I've come across a number of places where they say that the BOVs that get rid of the pressure into the air cause problems like stalling. It appears that its best to stick to a Recirc BOV.
However, you gotta have the Pshhhht! Of the atmospheric BOV
What are your views and experiences with BOVs?
Have you had problems and if so how have you sorted them?
I will be getting a an R33 GTS-T in the next couple of weeks so can any of you recomend a BOV for it?
Thanks!
However, you gotta have the Pshhhht! Of the atmospheric BOV
What are your views and experiences with BOVs?
Have you had problems and if so how have you sorted them?
I will be getting a an R33 GTS-T in the next couple of weeks so can any of you recomend a BOV for it?
Thanks!
turbo-tastic said:
That sound you crave will beome annoying very quickly.
Dont bother getting one, they're tacky and pointless. Money could and should be spent better elsewhere IMO
Dont bother getting one, they're tacky and pointless. Money could and should be spent better elsewhere IMO
Hasn't annoyed me yet, but then I do few miles. I changed the DV once the diaphragm stock recirc unit gave up...
If the car has a MAP sensor it should cope perfectly well.
The R33 GTST (and GTR) have Air Flow Meters (AFM) and recirculating BOV's.
Crudely put, AFM's work by having a flap that opens as air is sucked into the engine. The angle of the flap dictates how much air is going in and thus how much fuelis required.
When you lift off, the BOV vents pressure into the intake manifold, closing the flap and cutting fuel. withouth the recirc BOV, the flap stays open and you tend to overfuel a bit. your fuel economy will get worse but more importantly, you also get bore wash (neat fuel stripping the thin layer of oil from the cylinder lining). Not catastrophic but can give you increased wear over time. It'll also run a little rougher, but nothing really noticable, perhaps slightly worse at idle.
The ideal option is to get a hybrid valve, that has a partial vent to atmosphere, so you get to have your cake and eat it too. Like this:
www.gofastbits.com/index.php?parentid=products&option=products&sub_option=bovs&sub_sub_option=hybrid
Crudely put, AFM's work by having a flap that opens as air is sucked into the engine. The angle of the flap dictates how much air is going in and thus how much fuelis required.
When you lift off, the BOV vents pressure into the intake manifold, closing the flap and cutting fuel. withouth the recirc BOV, the flap stays open and you tend to overfuel a bit. your fuel economy will get worse but more importantly, you also get bore wash (neat fuel stripping the thin layer of oil from the cylinder lining). Not catastrophic but can give you increased wear over time. It'll also run a little rougher, but nothing really noticable, perhaps slightly worse at idle.
The ideal option is to get a hybrid valve, that has a partial vent to atmosphere, so you get to have your cake and eat it too. Like this:
www.gofastbits.com/index.php?parentid=products&option=products&sub_option=bovs&sub_sub_option=hybrid
koh said:
i(and alot of other gtst owners) have a hks ssq bov on my spec 1 gtst,i dont have any stalling issues with it,an ssq is your best bet for avioding comon bov problems
Was it fairly straight forward to fit? How much did it cost?
I would want to go for soemthing that has been tried and tested.
Mr E said:
turbo-tastic said:
That sound you crave will beome annoying very quickly.
Dont bother getting one, they're tacky and pointless. Money could and should be spent better elsewhere IMO
Dont bother getting one, they're tacky and pointless. Money could and should be spent better elsewhere IMO
Hasn't annoyed me yet, but then I do few miles. I changed the DV once the diaphragm stock recirc unit gave up...
If the car has a MAP sensor it should cope perfectly well.
I agree with MrE - i never got annoyed by mine, it always made me
MrsF(to be) never like it much though
Its chavvy but deep down i think i may have chav tendencies!
MrFlibbles said:
Its chavvy but deep down i think i may have chav tendencies!
Silly "pchshhh" noises - check.
Huge wheels - check
Holes in bonnet - check
Exhaust you could lose a toddler down - check
Fo'snizzle my homies. Or whatever the hip baseball cap wearing youth are saying this week.
Mr E said:
MrFlibbles said:
Its chavvy but deep down i think i may have chav tendencies!
Silly "pchshhh" noises - check.
Huge wheels - check
Holes in bonnet - check
Exhaust you could lose a toddler down - check
Fo'snizzle my homies. Or whatever the hip baseball cap wearing youth are saying this week.
more gauges than you know what to do with - check
silly sexist stickers on the dash - check
seats that women can't get into wearing a short skirt - check
a driver who speeds at every opportunity and is a bit of a tit - er no..... more like Miss Daisy here!
bint said:
Mr E said:
MrFlibbles said:
Its chavvy but deep down i think i may have chav tendencies!
Silly "pchshhh" noises - check.
Huge wheels - check
Holes in bonnet - check
Exhaust you could lose a toddler down - check
Fo'snizzle my homies. Or whatever the hip baseball cap wearing youth are saying this week.
more gauges than you know what to do with - check
silly sexist stickers on the dash - check
seats that women can't get into wearing a short skirt - check
a driver who speeds at every opportunity and is a bit of a tit - er no..... more like Miss Daisy here!
Tow Bar - check
"Stealth" dents and scratches - check
Tartan rug - check
Caravan club sticker - pending
bint said:
Mr E said:
MrFlibbles said:
Its chavvy but deep down i think i may have chav tendencies!
Silly "pchshhh" noises - check.
Huge wheels - check
Holes in bonnet - check
Exhaust you could lose a toddler down - check
Fo'snizzle my homies. Or whatever the hip baseball cap wearing youth are saying this week.
more gauges than you know what to do with - check
silly sexist stickers on the dash - check
seats that women can't get into wearing a short skirt - check
a driver who speeds at every opportunity and is a bit of a tit - er no..... more like Miss Daisy here!
Thanks dear.
I asked about this at Thor Racing the other day and it appears that if one is fitted whilst still running an air flow meter it can well and truly mess the running of the car up.
This is because the air is not re-circulated to match the correct amount of fuel in the inlet. The result is too much fuel which then causes the idleing problems and the possibility of the car cutting out when stopping sharply at say a set of lights.
This can be avoided though if you get a mapable ECU which means you can get rid of the airflow meter and have your atmospheric BOV. Though the standard re-circulating BOV is cappable up to 300BHP. Only worth it if you're having a serious power up grade IMO.
This is because the air is not re-circulated to match the correct amount of fuel in the inlet. The result is too much fuel which then causes the idleing problems and the possibility of the car cutting out when stopping sharply at say a set of lights.
This can be avoided though if you get a mapable ECU which means you can get rid of the airflow meter and have your atmospheric BOV. Though the standard re-circulating BOV is cappable up to 300BHP. Only worth it if you're having a serious power up grade IMO.
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