MORE PERFORMANCE - What to buy, and when for
your Solstice GXP or Sky Redline
The stock fuel system, engine internals and
drivetrain will support the factory turbo to its limits.
Stage 1. Free or Low Cost - replace the factory air filter with a K&N drop
in filter and shorten the waste-gate actuator rod. However the ECM will
eventually return power to stock levels.
or install a Manual
Boost Controller (MBC) and set boost at 18 to 20 psi. This will increase torque
significantly over stock and slightly increase top end power without
throwing error codes or limp mode. It is easily reverse-able.
Stage 2. get a ECM tune like Wester's
"Race" tune (note this may void your new car warranty) Get HP tuners
VCM suite to install the tune yourself. This will set boost pressure
and torque to about the max that the ECM will allow and increase the rev
limiter. However top end power will be limited by stock hardware. So
in order of performance effectiveness, replace the Intercooler, Air Box with a low restriction Intake Pipe, Catback Exhaust and Intercooler Piping.
Stage 3a. Larger turbo. Select from the
Mitsubishi 16g :375hp, Garrett 5027 :420hp, or Garrett GT3076 :500hp
kits. (The stock turbo is
rated at 260hp)
3b. Install
"Over-Booster" or IAT2-SS-Reg, and MAP-SS-Reg. Enrichen the fuel at
wide open throttle with HP tuners software. Set boost at 25-30psi(with
high octane gas)
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INFO Links:
For Info on Turbos go to the following (Garrett) links
Turbo Tech
101
102
103
WHAT SIZE TURBO UPGRADE SHOULD I GET? That depends on your driving
style and goals for your car. Be honest with yourself or you'll be
disappointed. Just as with V8 motors horsepower equals
torque x rpm. So high HP motors need high rpm but give up low rpm
torque to get it. This is what we recommend:
If your driving is 25-70mph street, twisties, or
auto-crossing: Mitsu16g because it spools up quickly giving lots of low
rpm torque for the power you want when you stomp the pedal at any rpm.
With this engine, it will run 25+psi all the way to 7000rpm
For freeway or high speed driving or if you like
to go drag racing occasionally: 5027 because it will handle 30psi with
race gas and make good midrange-hi rpm power. Spool up is noticeably
higher rpm, but still fun to drive on the street.
High speed driving, frequent drag racing, road racing, and beating up
on most street cars: GT3076, you'll spool up about 1000rpm later
than stock, but have massive power available over 4500rpm. However
you'll be downshifting a lot to get the torque you need when passing cars
on the road. Twisties will have you shifting a lot to stay in boost.
GT3582 & larger turbos on a 2.0 are for pure racing IMHO
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