Production Steam STX 67+ Turbos Are In

Great news, our production Steam STX 67+ turbos for Subaru WRX STI are in stock! The preorders have already started shipping, so you should see your turbos soon.

In case you were wondering, they are similar to our standard Steam STX 67 turbos, except the plus model has the next larger turbine. The should both be 350-400 whp turbos. The plus model might be a better fit for your car than the standard 67 if your car is more built, has a 2.5l motor, or otherwise is higher flowing.

You can read more about them here:
Steam STX 67+ Single Scroll for WRX STI
Steam STX 67+ Twin Scroll for WRX STI
Steam STX 67 Single Scroll for WRX STI
Steam STX 67 Twin Scroll for WRX STI

New Steam STX Turbo Stock
New Steam STX Turbo Stock

Here are some more detailed pictures.

Steam STX 67+ Turbocharger
Steam STX 67+ Turbocharger
Steam STX 67+ Turbocharger
Steam STX 67+ Turbocharger

The port job on these turbos look great. 🙂

Steam STX 67+ Turbocharger
Steam STX 67+ Turbocharger
Steam STX 67+ Turbocharger
Steam STX 67+ Turbocharger

Introducing the SteamSpeed 3-Port BCS

Tuners strongly recommend them; we recommend them.  Now we make them:  Introducing the SteamSpeed BCS (boost control solenoid aka EBCS) plug and play for all turbocharged Subaru models.

SteamSpeed EBCS for Subaru
SteamSpeed BCS PnP for All Turbocharged Subaru models

Our 3-port boost control solenoid provides super high resolution boost control to dial in much more accurate tunes vs. the old OEM 2-port solenoid.  Our BCS provides your tuner the tool need to safely dial in the correct boost levels, and achieve the best results possible.   At the heart of our BCS is a super reliable industrial valve that is more responsive, higher flowing, more durable than stock.  With our high performance BCS valve,  your turbo will spool quicker, and maintain the tightest possible boost curve.

We include everything you need in the box for plug and play install.  It mounts right to the stock location without modification with our custom made brackets, and clips right into the wiring harness.  We even include new silicon vacuum lines and bolts so no extra trips to the parts store is needed.

EBCS Back
SteamSpeed BCS PnP mounting bracket

Installation is a snap.  Our BCS can be installed in 15 min with basic tools by most everyone.

SteamSpeed EBCS
SteamSpeed BCS

We have used the GrimmSpeed BCS on our cars in the past, and they have worked great.  Tuners we have worked with in the past recommend them, so we used their product as a measuring stick.

GrimmSpeed EBCS
GrimmSpeed BCS

For our test, we simply swapped out the GrimmSpeed BCS and hooked in the vacuum lines in the exact same ports and swapped their connector for ours into the wiring harness.

How did it work out?  Not surprisingly, they worked basically the same since they both are based off of nearly identical MAC industrial valves.  In our testing, our higher flow barb option did out flow the GrimmSpeed BCS by about 20%.  Our standard barb option flowed exactly the same.  In fact, in our testing, the boost curves were identical with both BCS.

Swapping the GrimmSpeed EBCS for the SteamSpeed EBCS
Swapping the GrimmSpeed BCS for the SteamSpeed BCS

This is how our EBCS was hooked up to the waste gate.

Waste Gate Hookup
Waste Gate Hookup

Project Domino Small Update

Project Domino has been on the back burner for a little while, but we have been making a little progress.

The wiring is mostly done.  Today we got the DCCD all wired up.  The wires got damaged on the transmission, but we got them all cleaned up.

Power steering lines are hooked up to the rack, and the bumper cover is all set.

STI Twin-scroll bracket

STI Twin-scroll bracket

Power Steering Lines
Power Steering Lines
IMG_20150325_211020937
Power Steering Lines
DCCD Pro Wiring Done
DCCD Pro Wiring Done

 

Steam STX 71 Flow Testing [part 2] STX 71 vs GTX3071R

We have been able to compile our initial flow testing on our Steam STX 71 turbocharger, and we have to admit, our expectations have been exceeded.  We didn’t expect the STX 71 design to out flow the Garrett GTX3071R, but that is just what happened.  It turns out the original STX 71 design was actually quite good from the get go.  Don’t worry.  This testing is just a baseline.  We intend to make it even better.

Learn more about the Steam STX 71 Turbocharger here.

Just as a refresher, this is what the compressor map lines mean.

Compressor Maps Explained

Here is the Steam STX 71’s compressor map.  As yo can see, it has a max flow of a whopping 59.5 lbs/min.

Steam STX 71 Turbocharger Compressor Map
Steam STX 71 Turbocharger Compressor Map

How does the Steam STX 71 compare to the Garrett GTX3071R? See for your self. The STX 71 actually out flows the GTX3071R by at least a few lbs/min.

Steam STX 71 vs Garrett GTX3071R compressor map
Steam STX 71 vs Garrett GTX3071R compressor map

Here is the turbine section map for our Steam STX 71 turbocharger in our version Subaru WRX STI single scroll turbine housing.  It is mildly ported and 8 cm^2 in Mitsubishi speak or 0.55 A/R in Garrett speak.  The both measure the “size” of the scroll.  Bigger means the housing can flow more generally speaking.

Steam STX 71 turbine map
Steam STX 71 turbine map

How does our Subaru turbine housing flow compared to the Garrett T3 housing for a GT30 turbo?  It actually flows quite well for being “smaller” than a 0.63 A/R T3 housing.  We attribute this to our signature 9-blade high flow turbine design.

STX 71 vs GTX30 turbine map
STX 71 vs GTX30 turbine map

Blouch 20G-XTR vs Steam STX 20G-R

We have been asked many times by our customers, what is the difference between Blouch Turbo’s 20G-XT-R and our Steam STX 20-R.  We put together this little table to help you know that the differences are.  As far as we can tell, the biggest difference is that Blouch’s BB 20G costs almost $300 more than the Steam STX BB 20G.  What do you get for paying $300 more?  We can’t think of anything either.

More details on the Steam STX 20G-R.

  Blouch 20G-XTR Steam STX 20G-R
Compressor Wheel 20G 20G
Compressor Wheel Size 52.3mm/68mm 52.3mm/68mm
Compressor Wheel Material Billet aluminum Billet aluminum
Comp. Blade Design 6/6 Mitsubishi style 11 blade Garrett GTX style
Center Section Garrett BB (made in Mexico) Garrett BB (made in Japan)
Turbine Garrett GT30 (60 trim) Garrett GT30 (60 trim)
Estimated  Flow 47 lbs/min 49 lbs/min
Price $1,595.00 $1299.00

Steam STX 20G-R

Steam STX 20G-R

Steam STX 71 Flow Testing [part 1]

Steam STX 71 turbo mounted to gas bench
A Steam STX 71 Turbo mounted to the gas bench test rig.

Did you ever want to know how it’s possible for our Steam STX 71 turbocharger to make over 425+ WHP on your STI?  It’s all about flow dynamics.   We are not content with just having high-quality high-performance products so we decided to take the engineering to the next level.

Learn more about the Steam STX 71 for USDM STI, or JDM twinscroll STI.

Here is a dyno plot of our Steam STX 71 turbo in action.  There is a whopping 140 WHP gain over the stock VF39 turbo with very little left on the table.

The STX 71 vs VF39
The STX 71 vs VF39

Other manufacturers, like Blouch and ForcedPerformance, can simply make claims to how much their products flow.  But, how do they arrive at that number?  Without compressor maps to demonstrate thorough testing, one can assume they are just guesstimating.  Why make a guess?  Because real engineering is expensive.  Turbo testing is also very expensive, but that is what the big boys do to actually improve their products.  You can’t get, what you don’t measure.

Garrett also makes claims to how much their turbos flow, but they actually provide detailed compressor maps.  This is the result of rigorous engineering efforts.

Compressor Maps Explained

When Garrett improved their ball bearing turbo line, they actually provided empirical data showing how their product has improved.

gt4202R vs gtx4202r compressor map
gt4202R vs gtx4202r compressor map

Although we have had great results with our STX 71 model, and lots of happy customers, we never stop thinking our products can be better.  How do you make a great design better?

Steam STX 71 Performance Testing

First step, measure the performance of the current design.  The way Garrett and other serious turbo companies make compressor maps is by testing it on a gas bench, so that is exactly what we are doing.  The gas bench provides a super controlled environment to reliably test the turbocharger.

We measure a number of things on the gas bench: compressor wheel speed, pressures and temperatures before and after both housings, etc.  With this data, we will be able to generate compressor maps similar to those of Garrett.

Checkout our current production STX 71 on a gas bench as we map out the performance and efficiency of the current design.

Here is a production turbo with the turbine housing all mounted up to the hot side of the gas bench.  The yellow thing sticking out of the compressor housing is a speed sensor.  It measure how fast the compressor wheel is spinning.  The compressor wheel can spin in excesses of 150k RPM.

Steam STX 71 turbo mounted to gas bench
A Steam STX 71 Turbo mounted to the gas bench test rig.

Oil anyone?

Steam STX 71 turbo mounted to gas bench
Here the center housing’s oil ports are hooked up to ensure proper lubrication and cooling.

Here is the cold side being hooked up.

Steam STX 71 turbo mounted to gas bench
Here is the cold side getting hooked up.