North American Turbocoupe Organization



Is this the right bosch bpv?
spivster Offline
Member
#1
http://cgi.ebay.com/ebaymotors/ws/eBayIS...2462250117

IS that the BPV that everyone runs in thier cars? If so, is this something that an auto store like auto zone or napa would have? Is it the same as the one off of a sabb 900 turbo? (p/n would be good so the tools at autozone could find it in under an hour.....)
Thanks!

Oh, and one more question, How come everyone on this board says to put on a BPV while most everyone over on the stangnet board in the 2.3 section would say to use a bailey BOV? Most of those guys transplant the TC enigine into a 2.3 stang.. I am just curious i guess. *shrug*
84 Mustang SVO
90 Mustang LX 5.0 5 Speed
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natmac3 Offline
Administrator
#2
It should work fine. Maybe email the seller and ask for the p/n?

As for Us vs Stangnet, they recommend the Bailey because it is a dual-piston design that should stay closed under vaccum and only open when boost is present. Also many of them are probably running the Bailey as a Bypass, but calling it a Blow-off. The names are loosely used and the valves (bov/bpv) are basically the same, but the mounting and routing are different.

--n8

------------------
What every bird needs
1987tc
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jpsandberg Offline
Junior Member
#3
I have a general question (sure it's been asked a thousand times).
I have read what a BOV is vs a BPV. And also what the Gillis valve (boost control) does. Now, I know the gillis valve allows you to get higher-than-factory-set boost, but what are the differences/advantages of the BOV vs the BPV? recomendations? Which is most generally used here? BPV?
Thanks,
Joanthan
Jonathan
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Pete D Offline
Administrator
#4
We like to recommend the BPV from the standpoint that all intake air is metered (through the VAM), and the Bypass valve returns the air within the system instead of venting it outside the system (to atmosphere) which is what a blow off valve does.
Pete Dunham


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jpsandberg Offline
Junior Member
#5
Thanks! that makes sense to me. Now, I guess my next question would be, what is the advantage of having either the BOV or BPV vs. nothing at all?
From what I understand, it helps the lag for when you let off the throttle during shifts?
Thanks again,
Jonathan
Jonathan
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Pete D Offline
Administrator
#6
Either type valve does two beneficial things.
1. It allows the turbo to spool quicker after a shift because the turbo hasn't slowed down as much BECAUSE 2. The pressure wave of compressed air that was heading toward the throttle plate until it closed and bounced the air wave back toward the compressor wheels, never reaches the compressor wheel because the "valve" vented it away from the compressor wheel. Had the air wave reached the compressor wheel, is would have abruptly stopped dead. This, over time, can actually damage a turbo. (Sort of like you repeatdly running full speed into a brick wall, over time it's going to hurt [Image: biggrin.gif])

[This message has been edited by Pete D (edited 02-25-2004).]
Pete Dunham


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jpsandberg Offline
Junior Member
#7
Cool! thanks a lot Pete!
One last question. You said previaously "and the Bypass valve returns the air within the system instead of venting it outside the system (to atmosphere) which is what a blow off valve does."
why would returning the air into the system be of any benifit? if the air's already been meterered by the VAM, how is it benificial to have it put back into the system? (I guess I don't understand 'where' it gets put back into the system with the BPV)

Thanks again!
Jonathan
Jonathan
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Pete D Offline
Administrator
#8
The computer figures out how much fuel to supply, based in part on how much metered air comes through the VAM (it's a little more complicated than this) If air is lost (vented outside the system) this, in theory, throws the A/F ratio off, somewhat, very briefly.
A BPV is plumbed so that it vents the pressure wave close to, and in front of the throttle body. That air is then routed back to the inlet pipe on the compressor inlet. Thus the air is kept in the system but not "measure" twice, nor is it lost to atmoshphere
Pete Dunham


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jpsandberg Offline
Junior Member
#9
ahhh.. makes perfect sense.
Thanks, that's helps a ton.
So gillis and BPV is the way I'll go!

haha, ok, so ONE more question: generally, what kind of bypass valve do most people go with here, and is there a kit I can buy? (where from?)

Again, thank you.
Jonathan
Jonathan
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spivster Offline
Member
#10
From what i gathered doing a search most guys on this board use the bosch bypass valve, maybe someone else could be more specific if there is more then one, but to me it looks like a bosch bypass valve will cost anywhere from $10-40 depending on where you get it, and the bailey blow off valve cost more like $120 and it is from england i think (I got that from reading stuff over on stangnet.) From my viewpoint, $40 looks better then $120, even if you dont get the cool whoosh sound.. [Image: smile.gif]
84 Mustang SVO
90 Mustang LX 5.0 5 Speed
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