I have an 05 Evo VIII and for some reason it only boosts 3 lbs. Anybody got any ideas on whats wrong?

 

what boost you normally run? if your dropping all the way down to 3 psi, sounds like your turbo may be toast. thats a lot of boost loss unless you have a pipe hanging somewhere causing a MASSIVE boost leak. check all your piping and esp TB for roasted seals and a big leak. any other symptoms? boost gauge? gl with the diagnosis!

 

well i just bought the car about a week ago and it never went above 3 lbs. tomorrow im going to a friends that has an evo IX and doing a boost leak test tomorrow. Otherwise the car runs and drives fine.

 

boost leak test would be the first thing to check. once thats done, go from there.

how many miles/mods? thats a big drop in boost no question. let us know after the test and we can go from there. gl brother

 

This sounds kinda dumb but check the wastegate arm to make sure it's still connected.

 

I just replaced the wastegate acturator today and it still did nothing. Otherwise there is no engine mod, and car has 67k on it

 

does it feel fast 3psi would feel like a slug maby its just a bad boost gauge

 

maybe the boost controller is hooked up backwards. switch the vacuum lines.

 

even wastegate pressure is at least 11-14psi stock

 

Boost leak or turbo is on it's last leg.

 

no car is sluggish as all hell, and boost controller is not on wrong i took it off my friends gst thats not using it and its on right.

 

From where are you getting the boost reference source for your MBC? Is it from the IM/DV "T", or compressor discharge pipe nipple?

 

If you are only seeing 3#, then I would suspect and at least check that the WG flapper valve is even mounted on the pivot arm shaft. The spot welds have been known to fail upon occasion.

 

Sounds like a toasted turbo. I would pull off the air intake and check for excessive shaft play. GL with everything.

 

Sorry, but you bought the car and it never boosted above 3psi? I hope you didn't know about this before buying the car.