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Old 03-21-2013, 12:30 PM   #1
BakZamGai
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Default GR Twin Scroll : Dom 3 XT-R vs Kamak TD06SL2-20GTX

Hey folks

I'm running a GR STi with a built block that I've converted to the JDM twin scroll setup. Looking at more power without losing too much response.

Have found 2 twin scroll options that I would like an opinion on.

Blouch Dominator 3 XT-R ~ $2, 000
- Garrett Ball-Bearing CHRA
- 76mm billet XT compressor, 55lbs
- 3" compressor inlet
- ceramic coated exhaust housing

KAMAK STS TD06SL2-20GTX ~ $1, 300
- upgraded thrust bearing
- 9-blade STS turbine wheel (54.1mm/61mm)
- Billet Compressor wheel (52.3/68mm)
- 3" anti-surge compressor inlet

Due to legal restrictions, I have to keep the the standard exhaust manifold and downpipes..but I'm shooting for as close to 400whp on a Mustang dyno with the best possible response on pump gas.
The Dom 3 obviously has larger flow with ball-bearings but if the Kamak will get the power I need without much drama, then I'm saving $700 for other mods. I'm hoping the twin scroll will negate the advantage of the ball-bearing CHRA, especially since the stock VF turbo uses thrust bearings too.
Any opinions, folks?

Engine
- built 2.5l with JE FSR pistons
- Manley Turbo-Tuff I-beam rods
- 8.5:1 CR
- A1 Technologis H11 Headstuds
- Ported dual AVCS heads with Kelford Road/Race (R-220-C) cams
- JDM Twin Scroll manifold and downpipe
- Invidia Q300 cat-back exhaust
- APS Lancer Evolution FMIC core with custom piping
- Carbonetics carbon triple-plate
- ID1000 injectors with Bosch 044 pump

Cheers
Dennis
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Last edited by BakZamGai; 03-21-2013 at 10:14 PM. Reason: Updated details....
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Old 03-21-2013, 04:15 PM   #2
06trackguy
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Default

ughhhh stupid laptop!!

Last edited by 06trackguy; 03-21-2013 at 04:43 PM.
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Old 03-21-2013, 04:42 PM   #3
06trackguy
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If you want 400whp with great response than I think you're looking at the wrong turbos. Check out the Twin scroll Dominator 1.5xtr. Even the single scroll unit has great response spooling up very close to stock and will make close to if not more than 400whp on a Dynocom Dyno. You may need to go with this version if you need to stick with a stock DP and exhaust manifold etc. Although even if you went with a twin scroll version your tuner should be able to get it to pass emission standards.
You said you already have a twin scroll manifold and DP though?? So are you not using them? You can't go twin scroll with out them! Either way, I will be going with the twin scroll version in a couple months time and my tuner (a very reputable one) has assured me that in this form the turbo will spool up faster than stock and make close to if not more than 400whp.
From reading your setup it seems like your motor should be good to over 7krpms? Just imagine a 400whp car that spools close to 2900rpms and pulls hard to redline! That sounds like a fun setup!! If you go this root though you will need a twin scroll manifold, up-pipe, and down pipe though. Just make sure you have a cat and your tuner should have no problem getting your car to pass emissions!! Good luck!! Just my 2 cents

http://www.bptstore.com/Subaru-WRXST...ger_p_130.html
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Old 03-21-2013, 09:38 PM   #4
BakZamGai
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Whoops, not sure if I made it clear - both turbos I listed will be spec-ed with twin scroll housings to suit the JDM manifold, up-pipe and downpipe.
I know that the Dom 1.5XT-R is probably capable of of hitting the target but I'm concerned that it would be operating on the ragged edge of the turbo's efficiency range.
The two turbos I listed should have a bit more headroom than the Dom 1.5XT-R, although I can't exactly be sure of the flow capacity of the Kamak 20GTX compressor.
I am running a 700hp capable FMIC though...
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Old 03-21-2013, 10:56 PM   #5
.Boston.
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I currently have the jdm twinscroll setup with a ported vf37, I have compared the 3.0xtr ts to the 1.5xtr ts and after hearing what tuners had to say I would definitely go with the 1.5 for your build. I plan on buying one relatively soon and will post up a review.
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Old 03-21-2013, 11:48 PM   #6
06trackguy
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I don't think you will be pushing it to much at all trying to achieve your goals. to me you just have to think about what will be faster/more responsive. With the 1.5ts you'll spool near 2900 and make power from there on up, with the 3.0ts you won't spool until maybe 42-4300rpm and be making the same power, maybe a little more.
say with the 1.5 you made 380 and with the 3.0 you ran low boost and made 400 I guarantee you the 1.5 is gonna be way faster and fun to drive. lag sucks!! I'd only run the 3.0 or the other turbo you were mentioning if you wanted more than 400whp or more later!!
That being said just stick with the 1.5 and if you want more in the future just upgrade to a bigger turbo later your going to have to re-tune anyways. to me a car should be all about responsiveness not really top end power. You know what they say "torque wins races, horse power sells cars".
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Old 03-22-2013, 03:15 AM   #7
BakZamGai
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I've looked around for proven dynos of the Dom 1.5XT-R on 93oct pump gas and they average in the mid-300s, I am not sure if I can push it past 400 without pushing the envelope....especially with the low-reading dyno I'm gonna be tuned on.
The other concern is that high-300s or 400 is running the 1.5XT-R right to the edge of its capabilities and start to hurt the reliability.
The quick spool is the primary reason why I converted my car to the JDM twin scroll setup so what you guys have suggested definitely sounds tasty...
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Old 03-22-2013, 06:19 AM   #8
dingobite
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2.5 xtr 'polka pickle; maybe it will have better spool than the 3.0 and give near identical response with power as the smaller 1.5xt.

My kamak 20gtx is should be here in a couple weeks.
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Old 03-22-2013, 06:27 AM   #9
05-rsx
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I honestly think you'd struggle to achieve anything near 400whp on factory headers, let alone downpipe.
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Old 03-22-2013, 08:16 AM   #10
BakZamGai
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Last I checked, Blouch only made twin scroll turbos in 2 flavours : 1.5XT-R or 3XT-R
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Old 03-22-2013, 08:24 AM   #11
Mr Wrex
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You're running a twin scroll with stock exhaust mani and downpipe?

Too bad you're not open to running e85 and larger injectors... you'd be able to get the Blouch 1.5xt-r TS and easily hit your goal. Btw, why are you asking us and not your tuner?
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Old 03-22-2013, 11:12 AM   #12
BakZamGai
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I've swapped in the complete JDM twin scroll exhaust manifold and up-pipe, so yes, I gotta run a twin scroll turbo.
I am from Singapore, so, no E85 available over here, sadly.
Tuner wants me to use the Litchfield LM turbos from UK, which is mucho dinero, so I am exploring other options....see what my options are...hehe
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Old 03-23-2013, 09:13 AM   #13
2011boostdwrx
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I am running the kamak 20 gtx sts, 360 whp / 380+ wtq low reading mustang. Full supporting mods stage2 sb etc. full spool 4100-4200 rpm w/FMIC

just switched to fully PNP DBB ss-20gxr tdo6sl2 from 6-star speed.
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Old 03-24-2013, 05:20 PM   #14
BakZamGai
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Interesting...when are your dyno results coming?
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Old 03-24-2013, 10:04 PM   #15
2011boostdwrx
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maybe 2 weeks
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Old 03-25-2013, 07:25 PM   #16
jaxscuby
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3" inlet will spool faster than the 2.4"
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Old 03-25-2013, 07:45 PM   #17
Fierysun
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Quote:
Originally Posted by jaxscuby View Post
3" inlet will spool faster than the 2.4"
Where is your proof of that?

I run a 3" and it does not spool faster than the 2.4" version.
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