I posted this in the FAQ/Newbie forum, but I haven't had much luck there. I'm hoping some of you more knowledgeable EVO fans can shed some light.



This is an otherwise bone stock 06 EVO IX RS....

I found a MAF adapter with a K&N cone filter and decided to try it out. I disconnected the negative battery terminal and installed it. This was right before I put the car in storage for winter. Four months later and I get the car out of hibernation.

I start driving it and look over at the factory boost gauge. The highest boost I've noticed is 1.2 bar = 17.405X psi. Hmm...that doesn't seem right. So I purchased a K&N drop in panel filter and I'll be swapping everything out for the stock airbox with the new K&N.

I read the stock boost on a IX is 19-20 psi. I haven't driven my EVO for a long time so I honestly don't remember what's normal. Thoughts?

 

I don't think the adapter and filter are causing your problem. Make sure that you didn't accidentally cut/unplug one of your boost lines.

 

how old is the filter, does it look dirty?

 

Stock, the ecu controls the boost based on engine load. You are now hitting the same load at lower boost levels, that is all. If you want more boost, install a MBC or get the car tuned with a GM BCS.

 

MBC should control this problem.

 

I removed everything today and put the stock airbox back on. I dropped in the new K&N panel filter I bought months ago. I disconnected the negative battery terminal before changing things out. I went for a quick drive. I let the car reach normal operating temp and ran it through some gears. The highest I peaked was 1.1 bar. It would then taper down to 1 bar. Sometimes it would only peak at 1 bar. WTF

 

Where did you get the filter kit from?

 

I bought the MAF adapter + K&N cone filter off another forum.

I now have the stock airbox assembly with a K&N panel filter in, but I'm still not boosting at normal levels. What are all you IX owners peaking at?