Dyno Results: SteamSpeed STX 71 for Mitsubishi Evo X

Introducing the SteamSpeed STX 71 for Mitsubishi Evo X

You’ve asked, we listened.  SteamSpeed now supplies turbos for the Evo X.   To start with, we brought over our same proven 59 lbs/min STX 71 CHRA we have used since the beginning on the STI.  On the STI, it typically puts down 400-450 whp and ft*lbs on pump gas.   How do you recon it would perform on a Evo X?  We set out to find out.  More pictures here…..

SteamSpeed STX 71 for Evo X Specs

Make no mistake, the STX 71 is designed to be a 18k.  How does it compare?

Model: SteamSpeed STX 71 MHI TD06-18K
Compressor Wheel: STX 71 (11 blade): 54.1mm/71.4mm 18K (7/7 blade): 55.1mm/75.0mm
Turbine Wheel: TD06SL2  (9-blade): 54.1mm/61.0mm TD06 (9-blade): 54.0mm/61.5mm
Flow: 59.5 lbs/min (tested) 54.0 lbs/min (est)
Install Kit Included: Yes No
Price: $1499 $1699

As you can see from the basic specs, the wheels are a somewhat smaller than the 18k; yet, the STX 71 flows 5.5 lbs/min, or about  10%.  In simple terms, the STX 71 will be a more responsive than the 18k while being capable of making ~10% more power.

Initial Dyno Results:

We’ve had a few testers out there, and the intal results are looking good.  It looks like they are getting a little more response with a little more power vs the 18k.

Here is some plots from data logs produced by Aaron at English Racing. this is the STX 71 vs the OEM turbo.  As you can see, you gain +100 whp, and give up close to nothing.  It feels the same as stock.

Here is the same car on their DynoJet dyno:

Here is the result from one of our customers in Florida.

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