Hi everyone,

I got a 2008 evo X in late January of this year (about 2 months ago) with 57k miles. It had an AMS FMIC and AMS intake when I bought it with a stage 1 cobb tune. I installed an ETS v3 dual muffler catback on it a few weeks ago.

Anyways, ever since i got the car i noticed it produces a concerning amount of boost. It peaks around 29psi and tapers to 25psi. This is kinda concerning to me, I have seen it peak all the way up to 29.8psi before. Today I ordered an AEM uego wideband to monitor my air:fuel ratio. If the evo's AFR is running too rich I'll definitely need to get it tuned. Has anyone seen this amount of overboost before? I am just concerned the previous owner was overboosting the evo all the time. Let me know if you've seen these kind of boost levels on an evo with just a FMIC and intake.

 

It must be tune check for knock doing logs.
My car is tuned at 28psi tapers down to 25psi and by redline to 20psi. On 91oct. It all depends on the tune.

 

Needs a tune. Stop going WOT before a rod goes through the block.

Cobb OTS tunes are horrible.