OK so I got everything I needed. Base tune from AMS, STRI electric boost gauge, and a new TurboXS manual boost controller. At AMS they told me that the best way to install the MBC is between the turbo compressor and wastegate actuator. Like so:



Compared to...



What do you guys think?

Also the boost gauge says I'm running only about 11psi. Is that right for stock? MBC isn't installed yet.

 

Diagram A is not Evo specific, so don't refer to it. To be applicable to our cars, the boost reference source would not be taken from any generalized point on the intake manifold. Instead, you would "T" into the line that runs from the intake manifold to the diverter valve.

So, for the Evo boost reference source, you either should use the compressor housing discharge tube's nipple as per AMS's advice or "T" into the intake manifold/DV line.

The AMS method supposedly creates less boost spiking while the other option provides quicker boost response.

 

If you are only running 11 PSI then you need to increase the wastegate preload(spring pressure) up to about 17 PSI. Don't forget to disconect and remove the entire factory boost hose assembly. Use only new 4mm rubber hose as the factory hoses have inline restrictor orifices. But your MBC probably comes with hoses, huh?

 

So in other words...

Use this:



Over this:

 

Either of the two methods illustrated in your post #34 is acceptable. I think that you'll find that most people on here like the turbo nipple boost reference source. I happen to prefer the other method, but either way will give acceptable results.

 

I'll try both and see which one works out better.

 

If you choose to "T" into the DV/IM line, then you need to make sure that you securely seal off the turbo's compressor nipple. Those little rubber caps sold in autoparts stores are too wimpy. Just cut off a 1&1/2 inch piece of 4mm vacuum hose and find a short tight fitting, fine threaded machine screw and force it into one end of the hose section tightly securing it with a ziptie and ziptie the other end of the short hose section onto the compressor nipple.

 

Will do, thanks for sharing your knowledge.

 

Those are the exact words I followed!

About you gettin the 11 PSI without the boost controller, first install the TurboXS manual boost controller on your car and see what results you get. Im sure ull have more than 11 PSI...

btw I was always gettin 11 psi until i fixed the mix up my boost contoller..

Let us know!

 

what should the stock psi be at on an 06 Evo IX? It was at 11 with stock lines like they should be. I just installed the MBC and its at 14 and feels very quick. Might there be a problem with the gauge? Is it not accurate?

 

Have you tried turning the boost up to 21 PSI?

 

not yet. I want to know if the gauge is accurate first

 

Can you borrow and swap in a buddy's boost gauge just to compare? Is the STRI gauge an electric gauge with a stepper motor? This may be a couple PSI optimistic. So, you should check. Or just buy another gauge such as a Stewart Warner, if you don't want to spend the money for an expensive gauge such as Defi. I've had good luck with el cheapo Autometers.

 

yea if ur at 11psi ur only running off the wategate actuator thats the minimum u can run on a stock car