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The FPEVOGreen Model Turbocharger

Externally this turbo appears to be a stock EVO9 turbo. It uses factory castings so that all external features remain OEM in appearance and function. All bolt holes and thread sizes are exactly the same as the stock turbocharger. This is done to avoid the common problems associated with having aftermarket turbochargers on street cars.

The compressor and turbine housings are the largest OEM pieces available from the entire production life of Evolution footprint. The turbine housing is a 10.5cm2 nozzle housing and the compressor housing is the larger diffuser EVO9 casting.

The 69mm 5blade CNC machined compressor wheel has a flow rating of 47lb/min and pressure ratio capability beyond 3.7:1 which allows for over 30psi boost pressure and RPM range beyond 8krpm.

The turbine wheel is larger in diameter than the stock TD05H. The larger diameter significantly increase the turbine flow and reduce turbine blockage in the housing compared to a stock TD05H turbine wheel.

The combination of improved compressor and turbine flow characteristics results in a very wide RPM range performance increase. Spool up is very stock like, with part throttle boost being easily achieved at low engine RPM for city driving. Absent from this turbo is any hint of compressor surge. Even 5th gear WOT pulls starting at 2krpm do not result in compressor surge. Mid range and top end performance are dramatically improved as a result of the increased airflow capacity of the compressor and turbine sections.

A basic test car was prepared to demonstrate the characteristics of the turbocharger. Turbocharger boost response was carefully measured. The test car was a 2006 EVO9 RS with about 2500miles on it at the time of the tests. The car was only very mildly modified from it’s stock configuration.

The car was modified with the EVOGreen Model turbocharger and a larger 3” DP cat test pipe and O2 housing. An ECUTek reflash was used for tuning and a Greddy Emanage was used for data acquisition. No other modifications or changes were made to the car. Everything else remained as supplied by Mitsubishi.

The datalogs of the test car showed the excellent spool up of this turbocharger on even a very mildly prepared car. The EVOGreen Model will attain 1 bar boost before 3200rpm in 4th gear and at 2700rpm in 5th gear. Datalogs for each test show the Boost pressure, RPM, and AirFlow Meter Hz for reference. Notice that the Boost pressure trace is flat and has ablolutely no trace of compressor surge.

Even lugging along in 5th gear at 3100rpm and 20psi for several seconds will not induce compressor surge. We don’t know why anyone would want to lug along WOT in 5th gear and 3000rpm, but if you have always wanted to, now you can. Downshifting a gear or two is much more entertaining.

Spool up with the stock turbo and stock DP was virtually the same as the EVOGreen model and aftermarket DP. We considered running the EVOGreen with the stock DP, but it seemed out of character. Nobody is going to run the upgraded turbo with a stock DP so the test was declared irrelevant.

The car was dyno’d at Alamo Autosports on their AWD Dynojet Chassis Dyno. (see pic of car on dyno and dyno screen)

We were short on time, so instead of tuning the car we decided to just make three pulls and call it a day. The pulls were made on straight 93 octane fuel, no meth, no coke, no herion. Boost pressure was fluctuating a bit due to the “raw” nature of the boost control maps in the ECU but stayed in the 20-24psi range. I think the boost overshoot is almost visible on the dyno graph.

For comparison, bone stock EVO9 are putting 245whp to the wheels on this same dynojet. The test car did 357whp and 337ftlb TQ on the second pull, the third pull was a little lower due to the car getting heat soaked. Not bad for a car with a turbo, exhaust system and exhaust cam upgrade running on straight pump gas. (see jpeg of 357whp dyno graph)

Is there more in it? Yeah, there always is, but that is what you can expect if you slap some parts on a stock car and hit the dyno.

Dyno and quarter mile performance was shown to be excellent at the opposite end of the spectrum in the well prepared test vehicles of David Buschur and Curt Brown. These two cars showed ¼ mile ET in the 10.50-10.90 second range with speed in the 127-129mph range. Dyno results from these test vehicles showed power to be in the 420-450whp range. Dyno graphs for these cars are also shown to demonstrate the full potential of the EVOGreen Model turbocharger. (see dyno graphs of Buschur and Curt)


Forced Performance Turbochargers, 671 New Hope Road West, McKinney, TX 75071 - Tel: (972) 984-1800
  © 2009 Forced Performance, Inc.
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