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Old 01-13-2009, 07:08 PM   #1
RallySport Direct
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Default RallySportDirect, APS SS45 Turbo, 2008 STi

With the arrival of the new APS SS42 and SS45 turbo, we knew it was a matter of time till we put one on the 2008 STi we have here to see what this turbo could do.

The APS SS45 turbo is a 45lb wheel in a TD06 20G 8cm^3 housing. So pritty much the largest 20G.

Now on to the car.
2008 STi 17000 Miles

Power Mods:
APS Bypass Valve
Invidia V3 Catless Down Pipe
HKS Legamax Jasma Legal cat back (65mm, 2.55").
HKS Racing Suction intake
DeatschWerks 750inj
TXS Up-Pipe
Samco IC hose kit
HOA Boost control Solenoid
Cobb Tuning Access Port
Cobb Tuning Pro-Tune. Thanks John

Temps: mid 50's
Fuel: Utah winter 91 Octane (10% alcohol). Worst gas EVER!

The comparison you see is of a STG2 2008 STi (new calibration of the Mustang Dyno at Cobb tuning is ruthless. Putting Stg2 2008 STi's at 250WHP), talk about a heart breaker . But we all know, its not about the HP numbers, its about the before and after comparison.

First and foremost, this turbo needs AIR! We tried to see what the car could do with a stock Air intake Box, using a drop in filter. And the numbers where a bit disappointing to say the least. It was apparent that we needed to free up the flow going in and out. So we decided to put on a HKS Racing Intake, and the results are amazing to say the least!

After doing the re-tune for the intake, we ran into another problem. The 65mm cat back on the car started backing up the motor in the higher RPM(past 6K), not allowing us to run more then 18degrees of timing. The boost is set at 22PSI tapering to 17psi by redline. Giving a safe and conservative tune, that will make the car easy to drive at the road course. So next up will be a 3" cat back, and the power should jump up another 15-20WHP! Then add a larger TMIC, and another 10WHP or so will be had

As you can see, the turbo is spooling up relativity fast compared to other 20G turbo chargers. The power delivery is very smooth, and the car drives similar to stock around town. The biggest difference was noticed after 4000RPM, the car now pulls ALL the way to redline. Which is something the stock VF48 could never do. And if you notice, the power and tq is up from stock everywhere past 3600RPM.

Overall impression: This is a great turbo for anyone looking to get more power out of their car with out stressing out the motor. If you notice, the powerband is very smooth, and consistent, giving you solid power from 3500RPM all the way to redline. A 3" cat back would have yielded about a extra 15-20WHP from 6000RPM to Redline, but thats a different write up.

To sum this all up, the power jumped 50WHP and 50WTQ by just bolting on the Turbo, and injectors on top of a stg2 car. Not bad

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Last edited by RallySport Direct; 04-02-2009 at 04:36 PM.
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