new install; vacuum issues?
Installed a greddy turbo and other hardware this past weekend (see stuff in my sig for details of my setup). Installation went smoothly, but my knuckles would say otherwise. I had an idle issue at first startup, but reason was apparant in a vacuum leak between the BOV and IM (loose air hose). The car then idled fine. I have driven the car a couple times this week and have been careful not to boost (I lied, boosted twice to 4psi).
What are your thoughts on this? --> When letting off the gas (blipping gas in the driveway, or stopping in neutral for a light), the RPMs will fall but will stay around 1700-2200 RPM and fall a few hundred RPM then raise back, then fall again, and repeats this cycle a few times before stabilizing. It eventually falls back and idles at 900RPM. I'm thinking I still have a vacuum leak somewhere. Listening closely to all the airline tubing joints and connections, I hear a hiss from the MBC. Is that a normal characteristic of a MBC? Any other ideas? I have an EMB ready to go, along with autotune and 02 clamp, and 310cc injectors, that I will install after I fix this problem. |
Sounds like a vacuum leak to me.
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Originally Posted by G Rat
(Post 501416)
What are your thoughts on this?
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ok hyper!! :jerkit:
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Originally Posted by r808
(Post 501456)
I've read that running a BOV with a mass air meter is a terrible idea because of the driveability issues it creates. But people can't resist the rice.
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Originally Posted by p51hellfire
(Post 501463)
ok hyper!! :jerkit:
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thats what happened to my last turbo car running atmospheric bov with a maf.
try unhooking your bov and blocking its vac line... just for a second. if it is the problem, and it happens alot you will go through a set of spark plugs in a week from running so rich in those conditions. |
Originally Posted by shlammed
(Post 501498)
thats what happened to my last turbo car running atmospheric bov with a maf.
try unhooking your bov and blocking its vac line... just for a second. if it is the problem, and it happens alot you will go through a set of spark plugs in a week from running so rich in those conditions. |
If you have a Bosch blow off valve, then it should actually be a recirculating valve. If it has an outlet like this then you just need to get an inlet installed on your hot side pipe, and then hook the two up with a rubber hose:
http://d5otzd52uv6zz.cloudfront.net/...3816a6-350.jpg |
Originally Posted by dustinb
(Post 501544)
If you have a Bosch blow off valve, then it should actually be a recirculating valve. If it has an outlet like this then you just need to get an inlet installed on your hot side pipe, and then hook the two up with a rubber hose:
http://d5otzd52uv6zz.cloudfront.net/...3816a6-350.jpg |
Originally Posted by G Rat
(Post 501550)
It is a recirculating valve. So on the hot side pipe? The pipe leading from the IC to the IM has a mounting hole for the BOV, which is where it is at presently..
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Originally Posted by webby459
(Post 501468)
Um, bov needs to be vented back into the intake tract, right?
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Originally Posted by r808
(Post 501777)
Yeah I meant bad idea for a vent to air setup.
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I removed the BOV last night, vacuum issues completely gone. Took it out for a quick spin - hell yeah. Next is to get the EMB and 02 sensor installed. Thanks everyone.
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Originally Posted by G Rat
(Post 501976)
I removed the BOV last night, vacuum issues completely gone...
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Originally Posted by buffon01
(Post 502033)
Eventually you are going to need a BOV. Also I know there has been ppl that have had compressor surge even at 6psi.
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Oh ok, also all I saw in your sig is FPR, are you planning on getting any real engine management??
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Originally Posted by buffon01
(Post 502043)
Oh ok, also all I saw in your sig is FPR, are you planning on getting any real engine management??
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