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Old 10-23-2009, 01:58 AM   #1
NITROS
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Member#: 41561
Join Date: Aug 2003
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
04 GT3076 2.1
Stroker = Broken 3rd

Default Dom 3 or Dom 2.5 or Dom 1 or FP Green? Want ~400 whp with quickest spool? 2.1 stroker

I'm having a hard time deciding on a turbo. I want to be in the 375 -400 whp on pump. I want to have spool as near as I can get to 4k. (4.5k sounds reasonable)

This is going on a fully built:

2.123 L ej205 stroker
mild port and polished ej20 heads.
BC 272 cams.
BC valve springs.

Can it be done?
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Old 10-23-2009, 03:32 AM   #2
morrocco88
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Member#: 104098
Join Date: Jan 2006
Chapter/Region: NWIC
Location: Eastern WA
Vehicle:
97' LGT 2.3 Dstroke
Rotated BW S256 6speed

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I got the Dom 2.5 for my stroker, and even though it's not done and running yet, I got it from Treystoys and he had it on a stock JDM EJ207 v8. He was making full boost by 4k (20 psi I think?) and was just cracking into the high 11.98 area on the 1/4. This was on 93 oct. and not even custom tuned. That was without the spooling goodness of the stroker.

From my research, I don't think you will get 375 whp on it though. I think you would need a 52lb turbo or more to hit that and this depends on what dyno. I always get tuned on a Mustang where stock sti's make 220 to 230whp.

Sometimes I wish I wouldv'e got a Dom 3 instead, but I haven't even run the 2.5 yet. It just seems all my other turbo's left me a little disappointed in "numbers" and made me wish I went bigger. Although despite lower than expected numbers, the car hauled ass.

The problem is there's not much good data or graphs on the strokers, so choose wisely . I already have the 2.5 so I'm just going to stick with it and se where I end up.
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Old 10-23-2009, 03:42 AM   #3
kpluiten
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Location: AZ
Vehicle:
06 WRBWRXWGN
Now with 100% more Spec-C

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No love for the DOM 2?

I'm running the DOM 2.0 which is the same as a DOM 3.0, but it's not ball bearing. It is a 52 lb/min turbo. It is on my built (short block, stock EJ255 heads) motor. I was tuned this summer and on e85, at 21.5 psi, I made 373 whp on a mustang dyno with an ambient temperature of 107 degrees (AZ summer FTL). When it hits, it hits HARD.

The spool is not bad, especially with the 6spd. I was at ~20psi by 4000 RPM.

If you find one for a good deal, I would definitely recommend it, but if you're looking new, then pay a bit more and get the DOM 3 with the ball bearings as it is a more robust turbo.

Also, don't forget that there are a lot of things that can aid spool. You can EASILY reduce spool RPM by coating/wrapping (or both ) your headers, uppipe and compressor housing. Porting in these areas will help a lot too. I've seen spool decreases of 200+RPM by retaining this heat in the exhaust system. I have not done this yet, but I will be doing it soon.

EDIT: My dyno graph. The scale is all wonky and the dyno's boost gauge is off (reported a max of 20.8, but other tools measured 21.5 psi). Anyway, the green curve is the boost and it was right around 19.9 to 20 psi at ~4K rpm. I need to get a better plot.



Better plot without boost:

Last edited by kpluiten; 10-23-2009 at 11:34 AM. Reason: boost not torque... it was late.
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Old 10-23-2009, 05:38 AM   #4
jason miller
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2003 WRX
PSM

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Well, most Greens tend to fall in the 360-380 whp range. The 7cm OG Greens can spool at 42-4300 on a stock ej205. A Dom 2.5/3 might hit full boost at 45-4800 rpm, and make a touch more hp. However, you have a different animal. The extra displacement should help spool, but the cams would hypothetically slow spool. I have no idea to what extent those two factors might cancel each other out.

If I were you, I'd either:

A. Go rotated gt3076r if you haven't already got all the intake/exhaust parts for an upgraded stock unit. You probably do though, in which case it wouldn't be the best idea to sell off a perfectly good uppipe, downpipe, intake, intercooler, etc...

B. If I could buy a brand new turbo, and wanted to stay stock location to go with other parts already upgraded, I'd look into the new Dom 3 XT-R. It's like the Dom 3 in that it's ball bearing Garret components, but it has a billet 55 lb/min compressor wheel. That's a 3 lb/min increase, and a billet wheel means it's lighter weight which could potentially help spool. The current format includes a new 10cm exhaust housing. Honestly, with the 2.12 liter motor and wanting decent spool, I'd ask for an 8 cm housing unless you want to run it over 8k rpm.

C. If you're looking for a used turbo, find a good deal on any of the turbos you mentioned and get a good tune. They'll all be pretty similar and a good deal would be worth more to a budget buyer than the potential 30ish hp difference. Also, they all do well on race gas if you find that the pump map just isn't cutting it sometimes...
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Old 10-23-2009, 08:01 AM   #5
bugeyesubie
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Member#: 179783
Join Date: May 2008
Chapter/Region: W. Canada
Location: Calgary
Vehicle:
2002 WRX
Silver STi swap 380wph!!

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2.5R full ball bearing reliability, will get you to your power goal, perfect for you build imo!
good luck
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Old 10-23-2009, 10:58 AM   #6
NITROS
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Member#: 41561
Join Date: Aug 2003
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
04 GT3076 2.1
Stroker = Broken 3rd

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Good info here guys. Keep it coming if you can.
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Old 10-23-2009, 12:18 PM   #7
ownnij
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Member#: 70459
Join Date: Sep 2004
Chapter/Region: TXIC
Location: Las colinas, TX
Vehicle:
2002 AW Bugeye ej257
6spd, GT3076R, Alky & EWG

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gt3076r would be the bomb on this motor. whats your red line going to be set at? and do you have higher compression?
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Old 10-23-2009, 12:27 PM   #8
Thran
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Location: SoCal - Chino Hills
Vehicle:
2004 dom 2.5 wrx
Rally Blue

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Quote:
Originally Posted by jason miller View Post

B. If I could buy a brand new turbo, and wanted to stay stock location to go with other parts already upgraded, I'd look into the new Dom 3 XT-R. It's like the Dom 3 in that it's ball bearing Garret components, but it has a billet 55 lb/min compressor wheel. That's a 3 lb/min increase, and a billet wheel means it's lighter weight which could potentially help spool. The current format includes a new 10cm exhaust housing. Honestly, with the 2.12 liter motor and wanting decent spool, I'd ask for an 8 cm housing unless you want to run it over 8k rpm.
This is the option i want to put on my 2.18l stroker
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Old 10-23-2009, 01:30 PM   #9
ownnij
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Member#: 70459
Join Date: Sep 2004
Chapter/Region: TXIC
Location: Las colinas, TX
Vehicle:
2002 AW Bugeye ej257
6spd, GT3076R, Alky & EWG

Default

Quote:
Originally Posted by jason miller View Post
If I were you, I'd either:

A. Go rotated gt3076r if you haven't already got all the intake/exhaust parts for an upgraded stock unit. You probably do though, in which case it wouldn't be the best idea to sell off a perfectly good uppipe, downpipe, intake, intercooler, etc...
ding ding.. coming from a 30r stock location owner myself. i did have very good results from my stock location turbo but hands down, if i did it all over again i would go rotated. IN FACT, im going rotated right now.

the things i didnt like about stock location is that man.. it was a pita installing this turbo. the stock location inlet sucks. none of the less working on a rotated kit is by far less complicated and roomy.
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Old 10-23-2009, 03:52 PM   #10
kellygnsd
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Location: Rancho C
Vehicle:
2007 2.34LR, EFR7670
LINK G4 hybrid STi

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Quote:
Originally Posted by ownnij View Post
ding ding.. coming from a 30r stock location owner myself. i did have very good results from my stock location turbo but hands down, if i did it all over again i would go rotated. IN FACT, im going rotated right now.

the things i didnt like about stock location is that man.. it was a pita installing this turbo. the stock location inlet sucks. none of the less working on a rotated kit is by far less complicated and roomy.
I third this... I ran a stock location ATP 3076 and loved it. Full spool in 4th by 3500rpm on my built hybrid. I couldn't have asked for anything more but the install was a PITA. I'd rather donate a kidney than do that again so next stop, Fullrace rotated twinscroll.
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Old 10-26-2009, 12:40 PM   #11
Thran
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Join Date: Jun 2004
Chapter/Region: SCIC
Location: SoCal - Chino Hills
Vehicle:
2004 dom 2.5 wrx
Rally Blue

Default

hm... did u guys have a aftermarket inlet? for stock location?
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