i tested mine without plugging the TB and everything held the pressure just fine. Only leak i had was a port hole on my Greddy Type-S bov. I think i remember something about if the pistons are in a certain spot it will go out the exhaust.

Edit: guess ^ answered my suggestion.

 

ive done a lot of boost leak tests on my car and not once have i ever had to plug any lines (except MBC of course) or had to plug my TB.

you should be able to test the car exactly how its being driven

 

Thats what i assumed it should be. Thats why im askin y is there no pressure. Will take a long look into it and let u guys know what was the cause.

 

Shove a wadded up tshirt in the exhaust and see if you get any pressure at all.

 

dude your an idiot
i never realized how many people cant comprehend how a turbo system works on here

 

I'm no ASE master TECH, but if there is an exhaust valve open just enough to get air through and the intake valve is open too....... air will get through.

 

no it wont.
YOU ARE NOT PRESSURIZING THE ENGINE.

air starts at the compressor housing and ends at the throttle body. it does not go through the engine

 

Doh

No need to plug off any UICP. No need to put motor at TDC or anything silly like that.

Likely if you cannot get pressure in the system Id look here first and foremost.

https://www.evolutionm.net/forums/9082372-post6.html

Thanks again to Mr. Bryan for the diagram

 

I had this problem on a 2G eclipse before where the huge vac line under the intake manifold was off. The car wouldn't hold any boost. Once that line was put back on it was good to go. It's annoying because even though the motor is off the leak is large enough you can't really hear it. It's not like a small leak that hisses really bad.

Michael

 

Actually you are pressurizing your whole system.

I have done many many boost tests and know that as soon as you apply air to your system you can hear it passing through the turbo.

If your not making it past the inlet then you nipple is not secured enough.

I'd chalk this up to user error.

 

And what if his throttle plate is stuck cracked open? If plugging the exhaust makes a difference, then it gives you more things to check. It's called troubleshooting.

 

if your throttle body is stuck open, you have other issues.....
and why not read his post where he says the car idles like a champ, obviously it wouldnt if the throttle body is stuck open

your not pressurizing the engine on a boost leak test. THAT IS CALLED A LEAK DOWN TEST. a boost leak is test is just pressuring the the entire cold side of the turbo system

i guess i been doing all my boost leak tests completely wrong. i mean even when CBRD did my boost leak test before they tuned it, they did it the same exact way i do them. they didnt plug my exhaust, they didnt put my motor at TDC and they didnt plug and lines on the intake manifold. they simply drove my car in the shop and put the tester on the inlet of the turbo, and they came up with the same exact results as i did when i tested it before i took it there. no leaks at all, imagine that

 

I didnt say plug the TB genius, I said plug the coupler that would attach to the TB on the UICP, that way your only pressurizing the ic piping and not the engine.

 

check to make sure your EGR lines arent backwards-



cb

 

and again you would still be wrong... theres no need to plug that