I have an evo IX w/ megan tbe, o2 housing, drop in filter, hallman mbc, mail in tune.

I have been having problems with creep but it has gotten really bad with the cold weather. I will set the mbc to 12ish psi and it will creep to 19. If i set it to 19 it creeps to 24.

I checked the waste gate adjustment and it is set to where I just have to pull up the rod a tiny amount to attach it to the flapper(I think i am using the correct terminology).

Someone please help me get rid of the creep

 

it's probably the O2 housing, port it or get an O2 dump if you can stand the noise

 

Should I try adjusting the rod? Do I make it longer?

 

TBE means tha you are catless, right? What brand of O2 housing is it?

 

megan o2 housing and I have a resonated test pipe

 

Run a straight line to the actuator and see if that helps, if it does then the bleed port of the MBC is too large for your app.

 

You can try shortening the actuator rod. It may or may not help with the creep. At any rate it doesn´t cost anything to try. So, it´s worth a shot.

If that doesn´t work then the next alternative would be porting either the crossover port in the O2 housing, or porting the bypass port in the turbine housing.

BTW, are you using the compressor housing discharge nipple or the DV line as a boost reference source? The IX´s usually exhibit boost taper as opposed to boost creep.

 

noo...its the megan o2 housing. you have to port the merge hole... its too small its not letting the exhaust out fast enough i had to do it on mine.

 

Yeah possibly, but Robert´s suggestion is the logical 1st step as it´ll isolate the cause as either being turbo related or not. If it stops creeping then it is the boost control circuit. But, if it continues creeping when a line is run directly from the compressor nipple to the WGA, then it is a restrition of the exhaust flow in the bypass port or the O2 housing.

 

This is how my mbc is hooked up http://www.hallmanboostcontroller.com/howto.html.

Thanks for all the help guys. I will hook it up like Robert suggested and post results tomorrow.

 

So, just to make clear what you´ll be doing....disconnect the two hoses labeled, "A" & "B", as illustrated in the final pic of the Hallman installation instructions which you linked in your post.

Plug the now open ends of the A & B hoses so that you don´t induce a vacuum or boost leak. To plug the hoses you can use a golf T or some such.

Now, run a new and separate, short piece of 4mm hose directly from the port on the WGA to the port on the compressor housing discharge tube.

If you adjust the turnbuckle on the end of the threaded actuator rod to where it freely slides on and off the pivot arm on the flapper valve you will achieve what is called base wastegate pressure. With the stock actuator this is about 10-12 PSI. If the turbo creeps in this configuration then you need to port the O2 housing or the turbine housing. If on the other hand, it doesn´t creep but instead holds base pressure rock steady then the problem lies in the boost control circuit.

 

this is most likely the problem. couple of the local guys have had problems with boost creep, and most have been resolved by opening up the hole a bit where the two sides join.

the porting is most likely not necessary, but while you have it off, you should do it anyways because porting will always help in one way or another.

 

I wish I would have taken pictures, but it was also a common DSM issue...

Youll notice it when you had a 1g/2g turbo, threw on a exhaust, and realized it started to creep. What is happening is the wastegate port on the outlet side of the turbo/inlet side of the 02 housing is getting too much backpressure in the little path it only has to run before it merges with the exhaust stream.

I had this issue with the Megan 02 housing, so I took steps and took it off, and saw that the hole was about the size of a quarter, so I took my dremel with carbide bits, went at it to open it up fully, and voila! No more creep.

I also went an extra step and made the first "No 02 Dump in the market?" thread, which I got Walker from MPFab to fab up some nice 02 dumps! Then came EPMs and QTP. Those also help control creep on turbo applications.

Dan

 

I did this and it still creeps from 11 to 18 psi.

Which way to I adjust the rod to help remedy the creep until i can port my o2 housing? Do i make it longer or shorter?

Thanks for all the advice

 

Rod adjustment is not going to do anything if the exhaust gases can't flow well enough through the small 02 housing WG opening. You could drive around all day with the WG 100% open and still have the issue.

We've seen half a dozen megan/ebay 02 housings cause creep, the solid fix was always a better 02 housing or seeing if the WG hole can be ported enough without compromising the unit...