Lorax

Recalibrated sensor, Replaced SMT-6 with shorting plug, neither made any difference.
Ordering a new FPR right now, just in case that's the problem.

Lorax

Sorry for the crappy pics! Turns out my WB02 was just giving me crappy readings. AFR wasn't half bad.

You can see the obviously slow spoolup in this graph



These numbers are hard to read -

16psi with really super crappy clogged air filter - 282/283tq

16psi with no air filter - 289/300tq

19psi - 305/326tq

TRWright

The air filter made a huge difference!! - boost is still coming on a little slow- but I don't think you are that far off. . .

Fun day, btw !!

Lorax

Haha yeah that one guy was really cracking me up man. What a funny place.

Lorax

Ok, I have just finished pressure testing the system by placing an adapter in place of the MAF. This allows me to pressurize from the turbo compressor back to check for boost leaks.

I plugged her in, set the pressure to 30 psi, and it wont even build any pressure. There is a massive leak under pressure coming off what i think is the AOS connection under the intake manifold. Its a big enough leak to not allow my puny little air compressor to build at all, so wouldnt that be much more noticeable than just spoolup coming late??

Mike1982

I had a leak coming from one of the vacuum lines from the manifold to the ISV. It was cracked on the bottom half of the bend at the top, half way around. It effected my boost by 400RPM difference in build up to full boost.

Zero10

leak under the intake manifold....
The ISV will pretty much always leak, some have tried their best to seal it and IIRC nobody has really succeeded. Expect some small leaks from it. Using a tire compressor to pressurize the intake is not the best solution, since as you experienced it will not build any pressure at the slightest leak. If you know somebody close by with a bigger compressor use that and make sure it is not running when you test, you will be able to hear/find the leaks much better.

black944 turbo

You have to unplug the line to the AOS, it will pressurize the crankcase which is not good and you can not get enough air in there to do anyting. Disconnect that line and cap then you should be able to pressurise. I would only pressurise max of 15 psi.

fast951

Lorax, Did you verify that your WG is installed correctly?

toddk911

Just for comparison, my LR Super 75 in 4th gets 15psi about 4,100-4,200. I would say you must have a leak somewhere.

TRWright

Ryan-- be sure to disconnect the crankcase vent line off the j-pipe before you hook up the compressor

schnellfahrer

My VR Stage 2 boost to 15 psi@2940rpm.
I had some serious spool issues with a Guru modified wastegate.
A TIAL solved that.
I`m currently hunting down a rich condition (10.8 WOT) but I´m still seeing 15 psi@3100rpm.
A rich condition will not cause spoolup to increase by as much as 1000rpm.
This must be a leak or wastegate issue.

toddk911

Is there much difference in pressure testing via the MAF vs. using the hook up after the turbo on the IC hose?

Also, anyone know the easiest way to test exhaust system for leaks?

Lorax

Here is my high tech pressure testing adapter.



here is the plugged line. I initially just plugged the side connected to the intake, but air was still coming out of the other side (???)



Here is a spot where i was hearing some noise, till i clamped the hose coming from the intake that connects to it.



And here is the major leaky sounding area.



This is the same hose as the one in the previous photo, when i compress it with a screwdriver i can hear a difference in the sound.



What am i doing wrong?

fast951

Ryan, You should disconnect the crankcase breather hose from the J-pipe.

Did you verify the WG to be installed correctly?

So you like the idea of cutting up the fuel filter and using as a pressure tester?