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What are the symtems of a vacuum leak on 2nd turbo?
Ok, I called this guy about an FD he's got for sale, and one thing he told me was that he thought that the 2nd turbo had a vacuum leak. It's a new engine (8K miles) and newer turbos (23K) engine work and turbo install done by Atkins rotory.
I'm going down to VA-beach Saturday to look at the car, so i'd like to know what I could do to determine if it is indeed a vacuum leak or something more sinister...the guy was real nice on the phone, and very forthcoming about the cars' condition, but I just want to have all my bases covered when I go down there. TIA :) |
Does he have a boost gauge? That's what you really need to see what's going on with the turbos. It's very simple to hook one up temporarily for the test drive if you bring a gauge, and some vacuum line along.
The official boost test is to get in 3rd gear, at about 3000 rpm, then floor it. The gauge should jump immediately to 10 psi, then at 4500 rpm, should momentarily bob down to 8psi, then immediately back up to 10 psi. From there, it will usually drop back to about 7 or 8 by the time you get to 7000 rpm if it's still got the stock exhaust. If that's how it works, you don't have a problem. If it's anything other than that, you're going to learn a lot about vacuum hoses, like the rest of us :p: If you search for boost problems, you'll probably want to run away screaming into the night, but the good news is that a leak probably won't be that expensive to fix, though it will be painful. Ask me, or any other FD owner how we know :D My secondary turbo wasn't coming online when I bought the car, but the original owner didn't have a clue, and neither did I :p: Good luck, |
Originally posted by 13brv3 Does he have a boost gauge? That's what you really need to see what's going on with the turbos. It's very simple to hook one up temporarily for the test drive if you bring a gauge, and some vacuum line along. The official boost test is to get in 3rd gear, at about 3000 rpm, then floor it. The gauge should jump immediately to 10 psi, then at 4500 rpm, should momentarily bob down to 8psi, then immediately back up to 10 psi. From there, it will usually drop back to about 7 or 8 by the time you get to 7000 rpm if it's still got the stock exhaust. If that's how it works, you don't have a problem. If it's anything other than that, you're going to learn a lot about vacuum hoses, like the rest of us :p: If you search for boost problems, you'll probably want to run away screaming into the night, but the good news is that a leak probably won't be that expensive to fix, though it will be painful. Ask me, or any other FD owner how we know :D My secondary turbo wasn't coming online when I bought the car, but the original owner didn't have a clue, and neither did I :p: Good luck, thx! |
Originally posted by Section8 Ok, the car is completely stock, so no boost gauge, and I don't have one. Can I buy one from an autoparts store locally? I don't have enough time to order one and have it get here in time. Other than checking boost, would there be any audible sounds to listen for? thx! My (really) old Sears vacuum test gauge also measures pressure up to 10 psi. Something like that is an off the shelf item at a decent auto parts store. I've already used this in addition to my installed boost gauge (first mod) to help diagnose... what else, a boost problem. Cheers, |
Originally posted by 13brv3 There probably won't be any audible sounds, unless there's a major leak. The boost gauge is really the ticket though. My (really) old Sears vacuum test gauge also measures pressure up to 10 psi. Something like that is an off the shelf item at a decent auto parts store. I've already used this in addition to my installed boost gauge (first mod) to help diagnose... what else, a boost problem. Cheers, I'm hoping it's just a vacuum leak like the guy said, the car sound like a great deal otherwise :D |
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