Boost Leak Test Question

[quick2003]

I've done a lot of reading about boost leak tests and I have the parts to do it but I can't find the answer to my question. After you remove the intake, what do you do with the hoses (I have 3) connected to the intake? Do I need to plug them so I can pressurize the system?

 

[Staytuned]

The three hose are 1 off the valve cover - no need to plug it 2 the charcoal canister - no need to plug and the third is BCS leave it too. But you can also do a boost leak test off the IC pipe too. Sometimes the pressure gets by the oil seals on the turbo compressor and goes into the crankcase.....doesn't hurt anything but you want the pressure to stay in the IC pipes not the bottom end.

 

[Dream On]

On my 1g where I still had the bcs but with the hoses disconnected because the intake was taken off, there was one hose that all of the air was exiting, so I just capped it when doing the test. You'll be able to feel it, then just stick your finger over it during the test.

 

[quick2003]

Ok. Thanks for the help.
Now my problem is I don't seem to be getting any pressure built up. I don't feel any air escaping from the loose hoses, but I can't get it to budge from 0psi. When I unhook my compressor I do hear some air escaping from the nozzle. I am only using a small electric compressor could that be a problem?

 

[oldman]

Ok. Thanks for the help.
Now my problem is I don't seem to be getting any pressure built up. I don't feel any air escaping from the loose hoses, but I can't get it to budge from 0psi. When I unhook my compressor I do hear some air escaping from the nozzle. I am only using a small electric compressor could that be a problem?

Are we talking about the ones with an air tank or just little ones that inflats dolls.

 

[quick2003]

haha, yeah its just a little tire air compressor without the tank.

 

[oldman]

haha, yeah its just a little tire air compressor without the tank.

Too slow, use one with a storage tank.

 

[Dream On]

Could be the tank, could be massive leaks. Try starting at the throttle body elbow, fix any leaks, then go to the intercooler inlet, then turbo. Should help you isolate the leaks better. And don't forget the soapy water!


EDIT: Oldman, check your pm's. You should have one from me about porting, if my internet didn't mess up like it commonly does.

 

[quick2003]

Ok I borrowed an air tank. What should the pressure be at in the tank before I hook it up to the tester?

 

[oldman]

Ok I borrowed an air tank. What should the pressure be at in the tank before I hook it up to the tester?

You can set the regulator on the tank a little higher to increase flow rate since you seem to have major leaks, what you need to really worry about is what is being shown on your boost gauge.

EDIT: Oldman, check your pm's. You should have one from me about porting, if my internet didn't mess up like it commonly does.

Sorry about that, between every thing else while working on my own car project, I've become so backed up with pm's it's not even funny, I will try to get to it soon.

 

[badas93tsi]

But you can also do a boost leak test off the IC pipe too. Sometimes the pressure gets by the oil seals on the turbo compressor and goes into the crankcase.....doesn't hurt anything but you want the pressure to stay in the IC pipes not the bottom end.

Would it do this on a brand new turbo?

 

[oldman]

Would it do this on a brand new turbo?

Most definitely.

 

[badas93tsi]

Most definitely.

Damn, guess I need to test it right from the hot side of the ic then. Thanks for the response.