I have a 2010 EVO X MR and am new to the Mitsubishi/EVO world but have been involved with forced induction cars for a while. Looking for some feedback on what's reliable on 93 octane on a stock turbo setup. I also keep reading about how much power these SST transmissions can take, how far you can take it before the clutches slip, and how much the stock rods can handle.

I've also noticed in looking around the tuning/dyno forums that many people tend to stick to the stock boost curve (or even higher) where it overboosts in the mid range (~23 psi) and then tapers off towards redline (~15 psi). It creates a powerband on the dyno that seems uncharacteristic for a 2.0L turbo motor where peak TQ is higher than peak HP. I like how it feels at first in boost but then it runs out of breath. I'm more interested in linear torque curve/"constant acceleration feel" from the driver seat.

At a stock power level and with overly rich afr's in boost, it seems like you can get away with a lot of boost but that safety margin goes down as you start to increase airflow and efficiency, lean out afr's, add timing, and therefore become knock limited. I'm interested in some modest bolt-ons (FMIC, intake pipe, bigger injectors, ECU tune, etc) but don't want to sacrifice reliability.

Is it possible to maintain a solid boost flatline of like 18 or 20 psi all the way to redline? If so, what would I need to accomplish this?

Wasn't sure if the boost instability was more of a inherent side effect due to the turbine size/inefficiency, the WGA's ability to control it, if it was all programmed within the ECU or a combination of all 3.

Looking forward to your feedback.

 

im boosting 28psi on stock turbo on my 08 gsr and it hasnt blown up yet

 

Im boosting 26, spiking 28..tapering down to 20 by redline..i have a 3port. The stock turbo sucks up top..its like a sprinter in a cross country race..by 5.5-6krpm its pretty much done.. lol.. and about SST's..iuno..i would try to get ahold of kozmic27 or some gurus on here or the "other" forum..

 

i wouldn't run more than 25psi on 93oct

 

I run 93 Oct and using a greddy boost controller which has a LO and HI mode I run 25 psi and 28.5 psi respectively on my stock turbo. No problems in 50,000 miles. The WGA is upgraded.