How long should it take to get pressure into the system to perform a boost leak test?

 

I have just had my first attempt and failed miserably, I have got boost tester with gauge from Z1, when I connected it up to the air compressor and started to fill the system the pressure gauge did not move past zero.

 

I could not hear any hissing of air leaking, did'nt know if I have got a huge leak and the air is coming straight out or if I am not giving it enough time to build the pressure up.

what sort of compressor are you using?

what sort of compressor are you using?

 

Its a big Airmaster Tiger that I have borrowed from a friend, it should have enough power.

I never had any success trying it either. I used the compressor from my mates garage, I even turned the pressure up from the recommended 5 psi right up to 20 psi (not recommended pressurising crank - could blow an oil seal) but still nothing. Gave up after half an hour. Good luck!

I never had any success trying it either. I used the compressor from my mates garage, I even turned the pressure up from the recommended 5 psi right up to 20 psi (not recommended pressurising crank - could blow an oil seal) but still nothing. Gave up after half an hour. Good luck!

 

I have given up for today, will try again another day.

I never had any success trying it either. I used the compressor from my mates garage, I even turned the pressure up from the recommended 5 psi right up to 20 psi (not recommended pressurising crank - could blow an oil seal) but still nothing. Gave up after half an hour. Good luck!

 

Did you find out if you had a leak, or not ?

I had problems when I first tried to use one, no idea why it wouldn't get any pressure then next time I tried and everytime since, it's worked :confused:

I couldn't see or hear any kind of leak, so didn't know if I hadn't found anything, or the test hadn't worked as it didn't seem to hold any pressure. So had a re-think. The problem was a boost spike - I was getting a spike at 1.1 bar before settling at 0.9 bar, so I thought it could be a split hose opening up under pressure. Turned out to be the solenoid connector plug (?) was only disconnected on one turbo (both sides should be disconnected after fitting an elec boost controller) so the passenger side turbo was working twice as hard as the right, hence the initial spike before pressure being equalised across balance bar. Disconnected the plug, and what was 1 bar of boost was now 0.7. Turned boost controller up 90 degrees and now had 1 bar solid with no spike :)

try rotating the crank slightly... it's possible one cylinder is on overlap so you'll lose pressure through the exhaust valve...