boost leak symptoms?
Aug 18, 2009, 12:13 AM
#1
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boost leak symptoms?
Hello.
how do I know if I got a boost leak??what are the symptoms..
abnormal sound?no boost at all?whine?
searched and no answer...
thanks
how do I know if I got a boost leak??what are the symptoms..
abnormal sound?no boost at all?whine?
searched and no answer...
thanks
Aug 18, 2009, 12:19 AM
#2
slow spoolup, sometimes if the leaks to bad it will overboost and the car will feel weak. It would surely effect your a/f reading. Do you have a boost leak tester to test? Its pretty easy to do, just take off your intake and then connect a coupler to the turbo inlet and pressurize it and then listen for leaks. You could even go out and buy a bike pump and then make a leak tester and do it that way. I got my car to hold 21psi with a bike pump, once you can get your car to hold 20psi with a bike pump you know damn well your cars pretty leak free.
http://www.vfaq.com/mods/ICtester.html
or buy one already done from: http://www.machv.com/macvleaktes.html
If you hear the leak and cant pin point it then use soap and water and look for the bubbles. Anything could be the cause of the leak, a loose coupler, leaky injector seal, tb shaft seals, the list goes on and on.
http://www.vfaq.com/mods/ICtester.html
or buy one already done from: http://www.machv.com/macvleaktes.html
If you hear the leak and cant pin point it then use soap and water and look for the bubbles. Anything could be the cause of the leak, a loose coupler, leaky injector seal, tb shaft seals, the list goes on and on.
Aug 20, 2009, 07:45 PM
#4
Last edited by Z_Lancer_Man; Aug 20, 2009 at 07:58 PM.
Aug 20, 2009, 08:35 PM
#6
definitely order from mil.spec https://www.evolutionm.net/forums/ev...available.html
To replace the seals follow this: https://www.evolutionm.net/forums/ev...aft-seals.html
To replace the seals follow this: https://www.evolutionm.net/forums/ev...aft-seals.html
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Aug 20, 2009, 08:45 PM
#8
Most times there aren't any symptoms other than slower car.
I had a boost leak right under the steering wheel where my vacuum line to my boost gauge was. Never heard it because of the engine noises covering it up, but it was very loud when I did a leak test.
And now I found I have a leak because of my injector seals. And again no symptoms other than slower car. But your car will not "feel" that slow due to the torque spike you would have. So when you first go WOT the torque spike makes you feel fast but the leak does its deed in the higher rpms.
So in the end, you have no choice but to do a leak test. Even if you already replaced all your stock clamps with t-bolts and zip tied everything.
I had a boost leak right under the steering wheel where my vacuum line to my boost gauge was. Never heard it because of the engine noises covering it up, but it was very loud when I did a leak test.
And now I found I have a leak because of my injector seals. And again no symptoms other than slower car. But your car will not "feel" that slow due to the torque spike you would have. So when you first go WOT the torque spike makes you feel fast but the leak does its deed in the higher rpms.
So in the end, you have no choice but to do a leak test. Even if you already replaced all your stock clamps with t-bolts and zip tied everything.
Aug 20, 2009, 08:47 PM
#9
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slow spoolup, sometimes if the leaks to bad it will overboost and the car will feel weak. It would surely effect your a/f reading. Do you have a boost leak tester to test? Its pretty easy to do, just take off your intake and then connect a coupler to the turbo inlet and pressurize it and then listen for leaks. You could even go out and buy a bike pump and then make a leak tester and do it that way. I got my car to hold 21psi with a bike pump, once you can get your car to hold 20psi with a bike pump you know damn well your cars pretty leak free.
http://www.vfaq.com/mods/ICtester.html
or buy one already done from: http://www.machv.com/macvleaktes.html
If you hear the leak and cant pin point it then use soap and water and look for the bubbles. Anything could be the cause of the leak, a loose coupler, leaky injector seal, tb shaft seals, the list goes on and on.
http://www.vfaq.com/mods/ICtester.html
or buy one already done from: http://www.machv.com/macvleaktes.html
If you hear the leak and cant pin point it then use soap and water and look for the bubbles. Anything could be the cause of the leak, a loose coupler, leaky injector seal, tb shaft seals, the list goes on and on.
Wtf a bike pump?! youll be pumping for hours.. definately get a compressor..
another symptom is tapering boost to wastegate psi..
Aug 20, 2009, 08:49 PM
#10
really? try 25 pumps and I hit 21psi and it took over a half hour to go to 0psi. I used a bike pump on all 4 of my dsm's and now the evo. I cant find a good small / cheap compressor.. can you point me in the direction where to get one that is good for this particular job?
Aug 20, 2009, 09:07 PM
#12
nice thats what I was looking for man. Im gonna grab that tomorrow
Before I was looking at the wrong compressors with the big tanks and said **** it, but that little one looks perfect for this and pumping the tires up and little ends and odds.
Aug 20, 2009, 09:31 PM
#14
I went and got this just now on ebay http://cgi.ebay.com/ws/eBayISAPI.dll...EOIBSA:US:1123
I figured I'll get it on ebay, because right now im waiting on a rear trans/motor mount long bolt/nut to come. 100psi should be plenty for the leak test and tire pressure adjusting I hope.
I figured I'll get it on ebay, because right now im waiting on a rear trans/motor mount long bolt/nut to come. 100psi should be plenty for the leak test and tire pressure adjusting I hope.
