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Old 12-09-2007, 01:05 PM   #1
jacky599r
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Default the battle between dom3 and sz55

2 great turbos...1 damn car. im in for a turbo upgrade for my rex... but cant come to my senses on which 1 to get. 99% street driven still. Any comments? I prolly cant live with lots and lots of lag so... ya, advice advice advice.
i have the ssac fmic, coolingmist varicool stage 2, some other minor supporting mods. will be dropping DW injectors as well. im also hooked up with UTEC and might be switching to openecu. The drive train is totally stock and i dont want it to get toasted real quick. some kind soul pls.
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Old 12-09-2007, 01:34 PM   #2
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Kind of WRX? What year? Are you setting up a car for drag racing or road racing? Need lots more info to help you
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Old 12-09-2007, 01:51 PM   #3
jacky599r
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2006 rex, stock internals and tranny. road racing.
Are the 2 very much different? how abt reliability? some guys mentioned the dom3 needs more psi to achieve the same power another turbo of its class
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Old 12-09-2007, 02:41 PM   #4
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Both will make short work of your transmission. If you don't want it to "get toasted real quick" you probably shouldn't be looking at 52+ lb/min turbos.

With that being said, I would lean towards the Dom3 for a 99% street driven car. I've seen some (well tuned and well supported) 2.5's make full boost by 3700 on the 3.0R. SZ55 will probably be a little laggier.
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Old 12-09-2007, 05:22 PM   #5
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You could scale back a bit; go w/ the Dom 2.5, its a sweet turbo from everything I've seen and heard; and the issues that it had earlier were resolved; faster spooling and a ball bearing turbo.
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Old 12-09-2007, 08:07 PM   #6
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get the SZ55, if you are even thinking of going that big, might as well. trans will break eventually no matter which one you choose, so throw that out of your mind and just focus on your turbo/power goal.

30r would be better if it is in your budget
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Old 12-09-2007, 08:41 PM   #7
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what, no GT52 turbo?? . think the gt52 is right there with the dom III an sz55.

just installed my 52 this weekend an get it tuned on wed.
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Old 12-10-2007, 03:29 AM   #8
jacky599r
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how abt spool characteristics? dom3 gets a full BB. sz55 thrust bearing... so effective usable power on the street, doesnt it mean the dom3 has an advantage.... i dun always gun the car throttle to the metal also... so. ya.
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Old 12-10-2007, 06:46 AM   #9
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spool is going to vary on way too many factors of your setup. should a 52lb wheel spool faster with BB compared to a 55? sure. will it? hard to say, you would have to do the 2 back to back same tuner same day.

some dude might say yeah I have the Dom 3 and it spools at 3500, some dude might say no way my friend has it and it sucks and only spools at 4800.

both should be similar, may want to run it by whoever is going to tune your car based on there experience. maybe they have made a ton of power on SZ55s or had bad luck with them
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Old 12-10-2007, 06:49 AM   #10
jacky599r
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aight, anyone has the logs for both? or point to me a thread that i can find the comparison between them...
any idea the CFM @ 1 bar?
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Old 12-10-2007, 12:01 PM   #11
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help......
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Old 12-10-2007, 03:31 PM   #12
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Quote:
Originally Posted by jacky599r View Post
aight, anyone has the logs for both? or point to me a thread that i can find the comparison between them...
any idea the CFM @ 1 bar?
ray@revitup has logs of his dom3, i think 26psi by 3600rpm.
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Old 12-10-2007, 04:23 PM   #13
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Quote:
Originally Posted by Hines View Post
what, no GT52 turbo?? . think the gt52 is right there with the dom III an sz55.

just installed my 52 this weekend an get it tuned on wed.
dom 3 is the same as the gt52 except the dom 3 has the garrett ball bearing chra.
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Old 12-10-2007, 06:48 PM   #14
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I have a Dom III right now, great all around turbo. But I want more already.
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Old 12-10-2007, 07:50 PM   #15
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wo.....dom3's quite a fast spool turbo man consider its size.
sz55? damn.... i need one new turbo real quick...
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Old 12-11-2007, 03:31 AM   #16
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Upgrade your trans. A legacy GT 1-2 setup will at least help a ton if you take it easy in 1st. OEM stock clutch will be your friend.

GT52. Spool is ridiculous and will reliably get you around 450whp on your current setup. Phil was hitting 436whp on almost the same setup you have but was losing boost due to not having an EWG on the dyno (held boost perfectly on the road). That means he was probably between 450-460whp considering he was holding 2 more lbs of boost on the road.

http://www.elementtuning.com/Turboch...bochargers.htm
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Old 12-11-2007, 03:46 AM   #17
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Quote:
Originally Posted by jacky599r View Post
2 great turbos...1 damn car. im in for a turbo upgrade for my rex... but cant come to my senses on which 1 to get. 99% street driven still. Any comments? I prolly cant live with lots and lots of lag so... ya, advice advice advice.
i have the ssac fmic, coolingmist varicool stage 2, some other minor supporting mods. will be dropping DW injectors as well. im also hooked up with UTEC and might be switching to openecu. The drive train is totally stock and i dont want it to get toasted real quick. some kind soul pls.
.......with either turbo, you WILL soon shred the clutch, trans, and rearend.....probably in that order, unless you break an axle or something else somewhere in between.

That much power requires some serious thought about the driveline first, IMO.....or ya might want to start looking for a wrecked STi NOW......and have all the parts on hand, ahead of time
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Old 12-11-2007, 04:04 AM   #18
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Quote:
Originally Posted by WOR440 View Post
I have a Dom III right now, great all around turbo. But I want more already.
GO speak to Mike - he has Dom 4.0R coming out early n

Last edited by wrxsti.l; 12-11-2007 at 09:01 AM.
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Old 12-11-2007, 08:47 AM   #19
jacky599r
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^ nah... it seems too big for my appetite... i mean with the dom3 or sz55 alot of things are on the verge of breaking... i cant imagine what a 3.5R will do to my car. Besides, i need a responsive BIG turbo, fun to drive and doesnt take donkey yrs to spool and before i know it, its time to upshift. SO..... DOM3?! yes?
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Old 12-11-2007, 08:53 AM   #20
jacky599r
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^ nah... it seems too big for my appetite... i mean with the dom3 or sz55 alot of things are on the verge of breaking... i cant imagine what a 3.5R will do to my car. Besides, i need a responsive BIG turbo, fun to drive and doesnt take donkey yrs to spool and before i know it, its time to upshift. SO..... DOM3?! yes?
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Old 12-11-2007, 08:54 AM   #21
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oops - typo.

I meant Dom 4.0R is based on the GT3540 BB CHRA - the Dom 3.5R is based on the GT3040 BB CHRA :P
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Old 12-11-2007, 09:18 AM   #22
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whaha..same man.
wats ur mods like? so i can use it as a benchmark
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Old 12-11-2007, 09:20 AM   #23
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haha, doesnt matter...its big or hella big.
anyway, wats ur mod like? wanna use it as a benchmark
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Old 12-11-2007, 09:03 PM   #24
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some thoughts, will it be dumb to buy a dom3 and run it at 1 bar? i went through the airflow calculator and approx power i could get will be say 394g/sec? which is like wat close to 400whp? i think by that time things are starting to give way ya?
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Old 12-11-2007, 09:06 PM   #25
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Quote:
Originally Posted by jacky599r View Post
some thoughts, will it be dumb to buy a dom3 and run it at 1 bar? i went through the airflow calculator and approx power i could get will be say 394g/sec? which is like wat close to 400whp? i think by that time things are starting to give way ya?
1 bar would be nowhere near 400whp as its only like 14.7psi. You would need like 22psi to get that power.
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