Category Archives: Announcements

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.

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

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.

First Steam STX Turbo to Break 500 WHP?

Looking for max power in a stock location turbo?  Look no further.  Meet the Steam STX 76 XL turbocharger.  It is spec’ed off the GTX3076R compressor wheel capable of 500+ WHP.  The 3″ anti-surge compressor housing custom machined for this turbo.  It is compact, while increasing spool up time.  On the hot side, we have a 9-blade low-inertia TD06H turbine and new 10 cm² turbine housing.  With 30% reduced turbine mass, it can both spool up faster and increase flow.

Stay tuned to see what our buddies at FNP Tuning can do with it!

Production Steam STX 71 LGT Turbos Are In!

We have a production batch of STX 71 turbochargers for LGT fitment.

It is stock location fitment for:

Legacy GT 05-09
WRX 08-14

People call it LGT fitment because the 05 Legacy GT was the first to have that style of compressor housing.


This baby can easily make 400 whp on cars with the required supporting mods.  Check out the graph of the STX vs a stock VF39.

Check their own product page.

WRX 08-14 and Legacy GT Owners, The Wait Is Over

Introducing the Steam STX 71 with stock Lecgacy GT and WRX 08-14.  There aren’t as many options out there for the LGT guys, and none come to mind that make make STX 71 power.  Our customers have been asking us for a while, when will you make a STX 71 for in stock LGT fitment?

Well, here it is!

Steam STX 71 LGT

This turbo has the same 11-blade GTX3071R spec billet compressor wheel and TD06SL2 9-blade turbine as our STI model, but now with housings and lines for stock LGT fitment.

We are looking forward to the first LGT or WRX 08-14 guys to make 400-450 whp with a stock style turbo.


Visual Comparison of STX 71 and STX 20G-R

We make two different kinds of turbos here at SteamSpeed.  The first is a journal bearing based turbo (gold colored water lines in pictures) and the other is a genuine Garrett (Japan) ball bearing based turbo (silver colored water lines in pictures).

I thought I’d make a post with pictures of the two together so that those interested could easily compare their fitment.  Both turbos are factory location turbos and will install with little modification necessary.

The Steam STX 71 (gold water lines) is capable of up to about 450whp on E85 and we’ve seen the STX 20G-R (silver water lines) pull over 375whp on 91 octane.  Both are balanced on Schenck CHRA balancers, the best available, for extended durability.

P1050733 P1050732 P1050728 P1050727 P1050724 P1050718

Check Out the Mysterious Injectors We Bought Today

Here are the injectors the 2015 WRX uses.  The 2015 WRX has four  direct injection injectors unlike the BRZ that has both DI and PI.

It has JSDB-C1 written on one side.  On the other side, their appears to be a Bosch Hitachi logo.  Any one have more info in this injector they can share with everyone?  Please leave a comment below.  🙂

[update 1]

Per Bosch, it is not a Bosch injector.

[update 2]

Hitachi is supplying Subaru for the 2015 WRX direct injection system.