Make sure the wastegate is also properly "Hooked up" with the vacuum lines.. It does seem that you need that assist port on the back of the Wastegate.. I had some trouble with my 35r initially until I did that..

 

I had the boost creep issue until we made a couple changes with my EBC on the dyno. My numbers were almost the exact same as yours when i was on the dyno last weekend. 415whp and 344 ft. lbs. So it seems to be a very consistent turbo being that we almost have the same mods. I do have a 2.3, so boost comes about 500-600 rpms faster. I need a meth kit!

 

I leave mine open without problems....where do you hook that port to??

 

I agree with the issue with the deluxe fmic issue and small licp. Thats why I switched to the race fmic so I could benefit from 2.5" piping and a larger intercooler which is needed with this size turbo. I was under the impression that mike still have the stock uicp as well...

The heat is definatly an issue when trying to make good power numbers on a dyno...and humidity dosent help at all either..

 

Yea thats weird because I talked to Tial and Buschur ans they both said that you do not need the top port hooked up when using a mbc...just leave it vta...

I havent seen the boost creep, but when it was on the dyno, Al said it was creeping. I will check again today from a lower gear and see what it does.

 

They told me the same....maybe it is more prone to boost creep with a mbc, with my EBC i can control when the spring starts to open. Or maybe you just need to crank the boost to 30!lol!

 

Haha, well as funny as that it its true. It does not creep when the boost in cranked up to 29-30. So I figuring that when the boost is low (21-23) it does not have enough pressure to move the spring..thus causing the creep. Although Jrod dosent have any problems with this at low boost with the heavier spring...

 

Im not sure how Jarrod controls the boost in his car (mbc or through the AEM), but like i said, you have a lot more control with a EBC as far as WG pressure goes which is why i think i dont have the problem anymore. hmmm

 

Tial recommends setting up like a bleed system, so you have a boost source looped to the lower port, you put a T in there, then run that to your MBC or EBC, then the outlet (comm port) of the EBC/MBC to the assist port on top..

Everyone I spoke to said it wasn't necessary, but every TIAL document I read stated otherwise as did every EBC document for an external Wastegate setup, I suppose its really not 100% necessary, but the assist port is there to assist the spring...

 

FWIW I'm using an EBC and never had boost creep at low boost on my GT35r, but I think its because its a closed loop setup and has dynamic control of the settings.. I'm sure an MBC being a fixed setting may experience this regardless.. Honestly I don't like MBC's anyway..

 

on my EBC I have the com ran to the lower port and the boost source just running to the EBC solnoid....but it still works fine...

 

So the top port (on paper) should get T'd in with the bov correct? I will try this but I doubt I have the clearance ontop of the wastegate to fit the fitting on it without hitting the radiator. I will probably have to move the radoator more towards the front of the car to do this...

 

what ebc do you reccomend? The AEM looks like a good unit with the 5 bar sensor, especially since I have the wide band already...

 

This reply answers both of your questions..

I'm using the ugly Apexi AVC-R.. Its closed loop, and easy to set up in its most basic mode, in its RPM and gear based learning mode its fantastic..

Now, the top port is actually hooked up from the EBC Solenoid, the recommended setup is similar to the stock boost control setup, there is a boost source, it has a T, and then runs to the Wastegate lower port, the T goes to your NC port on the Solenoid, the COMM port on the Solenoid goes to the assist (top) port on the wastegate..

This way the pressure bled off from the solenoid, is routed to assist the actuator open or stay closed.. Supposedly it makes for a much more responsive boost control system.

If you need a better diagram, look up a TIAL Wastegate boost control diagram, or download the AVC-R documentation and look up the section on external wastegates, its diagrammed on there too..

If you were using an MBC, you would place the MBC in place of the solenoid, then the port with the weep hole goes to the assist port.. Just remember that the difference is the tighter you make the spring, the lower boost will be, the looser, the higher..

By doing this, you can use a lower pressure spring since the assist pressure allows the wastegate to stay closed under higher boost.

If you have any more questions PM Me, I feel bad I hijacked this thread... I only intended to give some input on the importance of using the proper parts.. hehe..

 

I personally wouldn't risk it being that i've already went through 1 radiator with this turbo kit