Ok I was getting a hesitation at WOT and at max boost. I changed my plugs and wires. Replaced the fuel filter and checked everything else I could think of.

Today I truned the boost down from 10psi to 7psi. And walla no more hesitation. So, this means that the MBC or the actuator was causing it. How the hell would the MBC cause my car to do that?

I also still have the 5lb actuator on the turbo. Should I upgrade to the 9lb or is it ok to run the 5lb and just turn it up w/ a better boost controler?

i ran into a problem with MBC not bening consistent. just bought a new spring for my wastegate.....go with like the 10lb-14lb spring (you'll drop some psi from the actual rating).

97 RS Star III(E) @15psi
JE pistons
Crower Rods
CF dual friction clutch
Apexi RS exhaust
race pipe (no cat)
B&M short shifter
HRC 500cc injectors
Vortech 3:1 FMU
Apexi S-AFC
TurboXS Dual stage MBC
fiberglass hood (with vents over turbo and inta

Generally, the stutter is (*GASP!*) pulled timing, knock, and extremely lean conditions-induced. Basically, if it stutters, it's *BAD*.

I don't think there is anything wrong with either your MBC or your wastegate, i think you are running too much boost for your current setup of stock injectors and BVROG (boost-variable rate-of-gain) fuel pressure regulator.

Get yer injectors, retune yer DFI, GO!

Out-of-the-box STAR setups on 96+ cars SUCK.

______________________________
If a sentence found online has 35% misspellings or greater and includes at least two racially charged expletives, chances are it is a YouTube comment.

'95 Eclipse TurboGS (garage deco)
'95 TSi AWD (restoring a survivor)
'97 Talon ESi-T (poor impulse control)
'99 Eclipse RS-T (daily beater)
'13 Evo X (mostly stock)
'17 Sienna (Middle Aged Dad Mobile)



Factory Service Manuals: http://nawdu.de/files/