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Registered:
May 2002
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 Mad Turbo Sound Effects
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Mon, 27 May 2002 01:40
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I looked thru the old forums, to no avail - hence I am re-posting.
Do most of yous with the boosted cars have a BOV ? If you do, is it an atmospheric one or recirculating one?
Also, whats that sound 'pss pss' that i hear from the 1G when it comes on boost? Nark said it was a compressor stall - what the hells that ?
Lastly - a mate with a CA18DET has a 'wastegate' - what do they do ? Sounds just like BOV... does it do the same thing ?
Thanks
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Location:
Brisbane, QLD, Australia
Registered:
May 2002
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Re: Mad Turbo Sound Effects
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Mon, 27 May 2002 01:56
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| Les wrote on Mon, 27 May 2002 11:40 AM |
I looked thru the old forums, to no avail - hence I am re-posting.
Do most of yous with the boosted cars have a BOV ? If you do, is it an atmospheric one or recirculating one?
Also, whats that sound 'pss pss' that i hear from the 1G when it comes on boost? Nark said it was a compressor stall - what the hells that ?
Lastly - a mate with a CA18DET has a 'wastegate' - what do they do ? Sounds just like BOV... does it do the same thing ?
Thanks
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Compressor stall:
"Pressure is forced in the opposite direction into the turbo when the throttle is released, this causes a compressor stall and the turbo stops spinning when changing gear, resulting in a delay in initial pick up."
http://www.regal-auto.co.uk/Turbos.html
I think that is what you are after.
Wastegate:
http://www.howstuffworks.com/turbo4.htm
Sort of the same, yet different at the same time.
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Location:
Perth
Registered:
May 2002
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Re: Mad Turbo Sound Effects
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Mon, 27 May 2002 02:01
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i have a plumback bov on my car for a couple of reasons
first, its an AFM car so when the BOV is working, it doesnt run really rich
second, im cheap and use a cheap BOV. its open at idle and so it would let outside air in and fkup the running of it (wont idle).
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Registered:
May 2002
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Re: Mad Turbo Sound Effects
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Mon, 27 May 2002 02:15
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Thanks fellas ! 
Kev how much u get that car for mate ? Looking good
so a resirc BOV is cheaper (fact) but we put it on why ? is it actually good for the car ? i.e. helps relieve the turbos of the pressure when the throttle is let go ? is that right ?
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Location:
Brisbane, QLD, Australia
Registered:
May 2002
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Re: Mad Turbo Sound Effects
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Mon, 27 May 2002 02:18
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| Les wrote on Mon, 27 May 2002 12:15 PM |
Thanks fellas !
Kev how much u get that car for mate ? Looking good
so a resirc BOV is cheaper (fact) but we put it on why ? is it actually good for the car ? i.e. helps relieve the turbos of the pressure when the throttle is let go ? is that right ?
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Sounds right to me. Notice they hiss when changing gears. 
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Registered:
May 2002
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Re: Mad Turbo Sound Effects
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Mon, 27 May 2002 02:26
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Not a 'hiss' supposedly... more a 'shattering' of the compressor wheel !! hehehe... cant be good...
But it does say on high boost applications only - as mine is still on stock boost - prolly no need to worry .... me thinks
should be able to handle it as when they are stock, they have no BOV... thus should be ok !
Kev what type BOV u running ?
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Location:
Gold Coast
Registered:
May 2002
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Re: Mad Turbo Sound Effects
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Mon, 27 May 2002 02:31
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This is lifted straight from my post on the old forums so some bits might not apply...
BOV's vent compressed intake air from after the turbo to either the atmosphere (pssht) or back into the intake before the turbo (for no flames in an AFM engine). They only open when the throttle is closed... hence throttle closed blow off valve. The idea is to release some of the pressure between the turbo and the throttle butterfly to extend turbo life and reduce spool up time (the turbo isn't trying to compress air into a wall and so continues to spin freely). They generally don't give you any more power but may change the power curve between gears.
Wastegates are different altogether and do not vent air at all. They bypass exhaust gas from before the turbine to after the turbine thereby limiting the amount of gas the turbo uses to spool thereby limiting boost. Internal wastegates are generally fitted to OEM turbos and consist of a bypass valve within the turbo housing that opens when actuated via a pressure sensing valve. That is, when the pressure sensing valve sees, say 12 lbs of boost, the actuator opens the wastgate and the exhaust gas bypasses the turbine.
External wastegates are usually used with aftermarket turbos (eg Turbonetics, Garrett) and perform the same function as described above. They generally allow for more exhaust gas flow (as they are usually used with bigger turbos) and tend to be more accurate not to mention easier to adjust. Some have a threaded top which when screwed up or down, raises or lowers the boost by changing the effective rate of the internal spring. Others have a diaphragm and an internal spring and are adjusted by varying the amount of pressure going to above and below the diaphragm.
HTH... and isn't incomprehensible.
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Registered:
May 2002
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Re: Mad Turbo Sound Effects
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Mon, 27 May 2002 03:01
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Exactly what i been looking for - sicccunt - thanks mate 
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Location:
Gold Coast
Registered:
May 2002
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Re: Mad Turbo Sound Effects
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Mon, 27 May 2002 04:23
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sicccunt? WTF?
And I thought my post was incomprehensible....
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Location:
Perth
Registered:
May 2002
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Re: Mad Turbo Sound Effects
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Mon, 27 May 2002 04:45
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Les,
my BOV is a Bosch type that I ordered through repco. Cost me like 60 bucks or something. Its just a little plastic thing that looks like a piece of retic  heh but it works well, has a nice sound on gearchanges, and most important of all it stops compressor stall which used to be a BIG problem
the car cost me $2k to buy, then it got a 5MGTE transplant, new gearbox, etc etc. Plus u can kinda notice that the import front on the Aus spec Mk2 doesnt quite line up
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Registered:
May 2002
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Re: Mad Turbo Sound Effects
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Mon, 27 May 2002 06:10
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Kev
u have a ID number for the part ? No hassles putting it on ? Im not after anything swish... just something that will preserve the engine - sounds like a BARRRRRRGAIn
siccunt ? split up the word after sic and read it out slowly... not imcomprehensible anymore !! This is a family forum after all !! 
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Location:
Wichita, Ks, USA
Registered:
May 2002
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Re: Mad Turbo Sound Effects
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Wed, 29 May 2002 02:13
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are you saying your bosch BOV is open during idle?
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