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  •  » Turbo Upgrade: SteamSpeed STX 71 Twin Scroll (Stock Location GTX3071)

#1 2014-10-07 22:44:29

2JZ
Member
From: Canada
Registered: 2011-06-30
User Number: 5647
Posts: 1774

Turbo Upgrade: SteamSpeed STX 71 Twin Scroll (Stock Location GTX3071)

Event: Road Dyno Pull
Location: Ontario, Canada
Ambient Temp: 75F Outside
Elevation: ~560ft
Weather: Sunny and Cool Outside
Tires: Hankook RS-3 on RPF1


Exterior Photo:
http://i.imgur.com/d4OOujW.jpg

Maf sensor maxed out. Tuned using speed density with NO IAT sensor. TQ was deliberately lowered for safety. 360whp traps 115-116mph on this dyno
http://i.imgur.com/8TilCHfl.jpg
I do not have a IAT sensor but had no choice but to take that route. The torque figures can easily match/exceed the horsepower rating however it was turned down for reliability as this car competes in a time attack.



Car: 2005 Saab 9-2x aka saabaru
Tuner: Andy @ Neetronics
Tuning Software: Open Source
Dyno Info: Dynojet
Transmission: 2004 JDM STI 6 Speed DCCD
Peak HP at RPM: 357WHP @ ~6,250 RPM
Peak Torque at RPM: 330WTQ @ ~4,400 RPM
Baseline hp/tq for a stock on same dyno: ~214WHP / 231WTQ Stock (EJ207 version 8)
Target Boost: 20PSI


Engine

EJ207 version 8
OEM Twin scroll headers
SteamSpeed STX71 twin scroll 10cm^2 (stock location GTX3071)
ID1000s
Custom 3 inch TS downpipe
Fujitsubo 3 inch catback w/ vibrant ultra-quiet resonator
Custom axle-back straight pipe (muffler delete via v-band)
Hyperflow 660GT FMIC kit
Forge BPV
KStech 83mm CAI
Perrin Inlet
Mocal thermostatic sandwhich plate (200F)
Setrab 19-row oil cooler
Walbro 255lph
IXIZ 3 port EBCS
Saikou Michi Dual Catch Cans
Koyo radiator & cap
Drivetrain
JDM STI 6MT (close ratio 5th & 6th)
DCCDPRO
CUSCO RS 1.5 LSD


The SteamSpeed STX71 turbocharger is one of the few stock location twin scroll turbochargers for version 8+ EJ207 owners. Based off of the GTX3071 compressor wheel (57lbs/in) with a 10cm^2 exhaust side. Although it is a journal bearing, it features a GTX style 11 blade billet compressor wheel. As far as I know, the STX71 is the only stock location twin scroll GTX style turbo on the market.

Simply put; this turbo kicks ass. On the street I see 20PSI by 4000RPM. Finally you can have power & spool on a 2.0L. Spool and response is very similar to the VF37 but the similarities end there. Without any practice (straight from dyno to the time attack) I was nearly 3 seconds faster at TMP Cayuga (1:20:588). My instructor and mentor (and mechanic) described the power delivery to that of a R35 GTR. Unbelievably smooth and the throttle control was transformed. The yearning to own a GT3 Porsche has died down; this car feels N/A in power delivery.  All my complaints of turbocharged cars has gone out the window. The turbo feels great around town and is just as fun as my stock VF37 down low. At 60MPH I can stay in 6th on the highway and make passes just like before.


I am going to get an IAT sensor and 4bar MAP sensor and see what else I can squeeze out for next year. Stay tuned.


http://4.bp.blogspot.com/-1QQVMa0BYfo/U-lkmf22WYI/AAAAAAAATnU/WIN8BBiSwzQ/s800/IMG_20140805_175754.jpg


Interior
http://i.imgur.com/hJ5l0Iwl.jpg


Video

1.5XTR single scroll WRX (94+meth) 375WHP on a Dynapack VS STX71 Twin Scroll Saab 9-2x 360WHP Dynojet
Saab couldn't go WOT; it was faster

Thanks to SteamSpeed I was 3 seconds faster at TMP cayuga with the STX71 turbo and ultimately faster than my main competitor. The track features two long straights that both hit over 200km/h and as a result, power is crucial for a faster lap time. This was the only track where my car couldn't produce a faster lap time than the WRX with my stock VF37 in the CSCS time attack series.

The turbo not only helped me in the straights but ultimately in the infield where the throttle control was a significant improvement over the VF37.

All in all the results were 1:20:588 (92x) vs 1:21:472 (WRX)

Last edited by 2JZ (2014-10-08 14:07:03)


2003 Subaru STi EJ207/6MT widebody wagon (daily driver)
1997 BMW 328is (racecar)
2005 Saab 9-2x STi 6MT
2006 Saab 9-2x Linear 5MT

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#2 2014-10-07 22:55:29

itsnotmeitsyou
Potato, Patreason...
Supporter
From: San Antonio, Texas
Registered: 2011-07-31
User Number: 5779
Posts: 2239

Re: Turbo Upgrade: SteamSpeed STX 71 Twin Scroll (Stock Location GTX3071)

So if you have trap speeds what was the trap time?  Or is this just hypothetical?  Do you have a baseline run on that same dyno before the upgrade?


2005 Saab 9-2x Aero:  More than you've had done to your car.
2015 Forester XT Touring

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#3 2014-10-07 22:57:31

2JZ
Member
From: Canada
Registered: 2011-06-30
User Number: 5647
Posts: 1774

Re: Turbo Upgrade: SteamSpeed STX 71 Twin Scroll (Stock Location GTX3071)

itsnotmeitsyou wrote:

So if you have trap speeds what was the trap time?  Or is this just hypothetical?  Do you have a baseline run on that same dyno before the upgrade?

hypothetical. Thats what speeds an STI traps when they make 360whp on this dyno. I made 275whp with the VF37 and trapped 105MPH... so 360whp @115 sounds about right if you ask me.
I originally intended to do the quarter mile last weekend but this happened

http://i.imgur.com/Bp2FvT1l.jpg

I raced a built FA20 FRS with a 30r that made 410whp on a dynapack and we were side by side. I'll post the video up tomorrow

Old Tune(s)

First tune: Catless downpipe 3 port EBCS (blue)
Second tune: + catback AEM CAI perrin inlet (red)

http://i.imgur.com/IAAA9Aml.jpg?1

Compared to STX 71 graph, you can see the VF37 makes more jam under 3500rpm but the STX71 takes over from there. At highway and cruising the two turbos feel identical and achieve the same MPG. That is; the amount of throttle needed to hold 40, 50, 60 mph is the same between the two. This is based off of vacuum readings

Last edited by 2JZ (2014-10-15 12:19:50)


2003 Subaru STi EJ207/6MT widebody wagon (daily driver)
1997 BMW 328is (racecar)
2005 Saab 9-2x STi 6MT
2006 Saab 9-2x Linear 5MT

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#4 2014-10-08 01:52:20

smadasam
Member
Registered: 2006-12-26
User Number: 1722
Posts: 300
Website

Re: Turbo Upgrade: SteamSpeed STX 71 Twin Scroll (Stock Location GTX3071)

Nice work 2JZ!  You are making feel super jealous right now that my car isn't running yet with my version 8 ej207 STI motor + STX 71 TS turbo.

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#5 2014-10-08 12:51:40

myzislow
Member
Registered: 2012-11-10
User Number: 7861
Posts: 275

Re: Turbo Upgrade: SteamSpeed STX 71 Twin Scroll (Stock Location GTX3071)

Awesome stuff! I really like the all black interior too. What did you use?

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#6 2014-10-08 13:07:07

2JZ
Member
From: Canada
Registered: 2011-06-30
User Number: 5647
Posts: 1774

Re: Turbo Upgrade: SteamSpeed STX 71 Twin Scroll (Stock Location GTX3071)

myzislow wrote:

Awesome stuff! I really like the all black interior too. What did you use?

duplicolor engine enamel 'low gloss black' was used to paint the center console. I have STI limited HVAC knobs so they are black with the silver dials. However, Subtle solutions makes a $20 overlay that is almost as good, I highly recommend them (my friend bought them). Disassemble your HVAC knob and paint all three silver with some spray paint.


2003 Subaru STi EJ207/6MT widebody wagon (daily driver)
1997 BMW 328is (racecar)
2005 Saab 9-2x STi 6MT
2006 Saab 9-2x Linear 5MT

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#7 2014-10-08 13:23:06

boston_errol
Supporter
Supporter
Registered: 2008-04-27
User Number: 2726
Posts: 3168

Re: Turbo Upgrade: SteamSpeed STX 71 Twin Scroll (Stock Location GTX3071)

https://d15mj6e6qmt1na.cloudfront.net/i/519265/600.jpg


2005 Legacy GT Wagon Ltd 5 speed ABP

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#8 2017-03-10 10:53:18

crescent1101
Member
Registered: 2017-03-01
User Number: 40105
Posts: 3

Re: Turbo Upgrade: SteamSpeed STX 71 Twin Scroll (Stock Location GTX3071)

Where did you get your your Custom 3in TS Downpipe?

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#9 2017-03-10 10:57:04

myzislow
Member
Registered: 2012-11-10
User Number: 7861
Posts: 275

Re: Turbo Upgrade: SteamSpeed STX 71 Twin Scroll (Stock Location GTX3071)

Steemspeed is garbage, went blouch after a host of issues with their stx71 and couldn't be happier

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#10 2017-03-10 13:59:32

crescent1101
Member
Registered: 2017-03-01
User Number: 40105
Posts: 3

Re: Turbo Upgrade: SteamSpeed STX 71 Twin Scroll (Stock Location GTX3071)

I have a VF37. Looking for a Catless down pipe for it. I have the stock JDM one.

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#11 2017-03-10 15:07:32

theleveler
Supporter
Supporter
From: Long Beach, CA
Registered: 2009-06-08
User Number: 3752
Posts: 1157

Re: Turbo Upgrade: SteamSpeed STX 71 Twin Scroll (Stock Location GTX3071)

Where do I get those sexy black climate control buttons?

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