Due to my overboosting issues during night/cold weather, I started looking into the possibilies that the previous garage that hooked up my manual boost controller screwed up. After doing my research, the garage installed it as per the TURBOSMART instructions to be found HERE.

This is how it should be as per TiAL, I tried that as well but still overboost.



A MBC should not go bad but I tried a new one nayway with the same result. I tried to T into the BOV line as a boost source and that also did not work, still going immediately past 20psi. Can it be that this particular MBC is set up for 20psi+ and the spring is too hard to allow 17psi?

 

Looks the same as tials instructions.

http://www.tialsport.com/documents/w..._wginstall.pdf

 

I cannot belive I drove the car for a year with no vacuum line on the wastegate or compressor and drove it now for 3 days with the ;lines ####ed up...Time to kill my ex-mechanic, good that I do everything my self now.

Thanks for the info!

 

Unless you have an electric boost controller you only use the side port on the tial, the top one stays open.

Also put your manual boost controller between the tial side port and your vaccum source.

Also dont put anything from that barb on the turbo compressor housing.

If you read up, that will make you get boost creep

 

Maybe you should think about blaming your mechanic instead of lovefab for a lot of the problems you had...

 

If any mechanic installs a downpipe on 2 fixed points (turbo discharge and WG discharge) and it's touching the frame, it's simly touching the frame. And if a DP hands 2 inches lower than it should, it hangs 2 inches lower than it should. nothing to do with the mechanic and as per the above post they got it right.

 

What you say suprises me but I will try it.

So I should take a vacuum source from the intake manifold and run it to the side port of the WG, connecting the MBC inline with the arrow towards the WG right?
What about the nipple on the compressor? Leave it open? What about boost leak than?

 

UPDATE: Ran the vacuum from the compressor to the side port of the WG and it boost 8psi + 2psi of creep. So off the spring basically. Last winter it ran 8psi +1psi of creep but I've added a single exhaust and the ported head might contribute to an additional 1psi of boost creep. Cody saw that happening too on a 8psi spring.

Now how to control the boost and bring it up to 17psi is the question. I found several different set-ups and have no coue what to do in my case.

Installing the MBC as per TiAL directions causes overboost, if I install it inline between the compressor nipple and the side WG port, it overboosts. If I run a vacuum without the MBC, it boost off the spring. What gives?

 

OK
Try this
Plug that nipple on the turbo.


Then do what I said in the first post.

Boost creep should be gone then

 

Did it. problem was the side nipple of the WG was leaking due to the fact that the silicone hose on the turbo outlet leans agains it. Another design flow I have to take care of.

Last problem I have is different boost at different temperatures, so I have to keep turning the MBC everytime it gets colder or hotter.