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Old 04-15-2009, 10:06 AM   #1
amirul
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Impreza WRX STi GT3082 or GT3582

Hey guys, i want to ask some expert advise and exprience.

i got fully built EJ207 with forged piston, rods, 280 degree cam etc. the whole lot.

My question is which turbo suit the Ej20 better? Gt30 or 35?

some people told me 35 will be bit too big for 2l laggy.

i also saw few ej207 with gt30 pump out 400hp @ all 4s.

so if i go with Gt35r will i make more than 400hp or will it be just too laggy to make decent power.

thanx in advance
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Old 04-15-2009, 04:00 PM   #2
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The 3082 is one of my favorite turbos. 82mm 35R compressor wheel with the smaller, quicker spooling 20R turbine side. Pick your hotside and go. Look up a member named dan_avon. He had a 3082 on a 207 that was amazing.
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Old 04-15-2009, 04:59 PM   #3
kellygnsd
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Quote:
Originally Posted by zer0psi View Post
The 3082 is one of my favorite turbos. 82mm 35R compressor wheel with the smaller, quicker spooling 20R turbine side. Pick your hotside and go. Look up a member named dan_avon. He had a 3082 on a 207 that was amazing.
What kind of numbers did you put down with yours?
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Old 04-15-2009, 07:51 PM   #4
STiGMATA
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great great turbo!!!!! spools quick and makes good power.... i had this turbo on my srt4 and it made 466hp on 100oct on a mustang dyno...i had it with the 3" inlet and the .63 turbine it had some minor surging so if you were to use it id suggest the anti surge compressor housing
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Old 04-15-2009, 11:07 PM   #5
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op you have any videos of your car idling?
also there is quite a different in power output between the two.
what do you rev to?
what tranny are you running?
when would you like to see full boost?
how much power do you want to make? and how much are you making now?
the thing is its not a matter of what suites your engine better, its a matter of what suites YOU better. do you want to wait till say 4200 rpms for 400 wheel? or can you wait till roughly 4800 rpms or so for 450, 500+ plus wheel. do you daily drive the car? is spool a concern??
hopefully answering these questions can help you.

Chris
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Old 04-16-2009, 12:32 AM   #6
ScorpionT
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What kind of power do you want to make on pump gas? Any plans to run meth?
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Old 04-16-2009, 11:39 AM   #7
amirul
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ok, i dont drive the car everyday. it will be weekend warrior. i mainly want to run 1/4 with it.

car is currently on stock turbo even tho the motor is built. so any power i make in future with either turbo will be very very BIG different for me!!

i would love the snail to spool as early as possible. the earlist spool ive seen with same spec motor and Gt3063 is around 3800rpm. and it make 400hp on 98oct on 28psi. so my question now is, with .82 will i make more than 400hp on 98oct on 28psi?? i know lag will come with it, but will i get more than 400hp?
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Old 04-16-2009, 11:50 AM   #8
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I'm a little confused by the 3063. I'm guessing that's a 30R with a .63 a/r, but which 30R? There's the 3071, 3076, and 3082, all named by their 71mm, 76mm, and 82mm compressor wheels respectively.

The 3082 is my choice...I'd imagine with the .63 you'd make 400hp @ less than 28psi, but then again I'm used to USDM fuels/tuning/dynos. With the .82 you'll lose spool but gain power and top end overall. I think you should be ok.
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Old 04-16-2009, 12:44 PM   #9
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well on my srt4 it was fully spooled at 3k and was at 21psi by 3700..... so im sure with the mile long exhaust pre-turbo the sti would be at 21 by 4000-4200.....
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Old 04-16-2009, 01:05 PM   #10
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Quote:
Originally Posted by STiGMATA View Post
well on my srt4 it was fully spooled at 3k and was at 21psi by 3700..... so im sure with the mile long exhaust pre-turbo the sti would be at 21 by 4000-4200.....
Doesn't fully spooled = full boost = 21psi?

Not be a smartass, just confused.
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Old 04-16-2009, 08:43 PM   #11
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Yeah, Im also confused on the GT3063...

If 400whp is your goal, the GT3076 should be just fine, same with a 3082. If you want more power and quicker spool than those, you should try the smaller Precision billet turbo. Theyre very promising from what Im hearing.
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Old 04-16-2009, 08:53 PM   #12
amirul
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yea what i meant by 3063 is Gt30 with .63, sorry my bad.

well i made my choice to go with .63. someone took me for a drive with GT30 with .63 and daymn is quick!!! thanx for the input guys.

probably take 2 week now to finish everything. i'll post some pics and video once its done!! cant wait
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Old 04-17-2009, 04:20 PM   #13
godforbid67
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Quote:
Originally Posted by zer0psi View Post
I'm a little confused by the 3063. I'm guessing that's a 30R with a .63 a/r, but which 30R? There's the 3071, 3076, and 3082, all named by their 71mm, 76mm, and 82mm compressor wheels respectively.

The 3082 is my choice...I'd imagine with the .63 you'd make 400hp @ less than 28psi, but then again I'm used to USDM fuels/tuning/dynos. With the .82 you'll lose spool but gain power and top end overall. I think you should be ok.
im confused i thought all gt30r's had 52mm compresser wheels? or are they 52 lb wheels or something? thats different from compresser wheels.
what is the difference between the two???
me is confuuused.

Chris
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Old 04-17-2009, 05:42 PM   #14
STiGMATA
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Quote:
Originally Posted by zer0psi View Post
Doesn't fully spooled = full boost = 21psi?

Not be a smartass, just confused.
no spool to me is the time it takes for the turbo to start creating boost i.e. its spooling to create boost......that how i look at it...
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Old 04-17-2009, 07:22 PM   #15
godforbid67
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yeah but you said fully spooled. which means your hitting your target psi.
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Old 04-17-2009, 08:07 PM   #16
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yeah fully spooled (creating positive pressure) and at target at around 3700...
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Old 04-17-2009, 11:45 PM   #17
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If you are just lookin to do drag with it, i would definitely go with the 35. I had a 35 on mine and it hit like a freight train. Granted i was runnin a 1.06 exhaust housing, but if you are worried about spooling just go with a .82 housing. I would've kept running my 35 but i want it more trackable so i opted with a 30, the motor is being built currently. But as long as you have internals built RIGHT you shouldn't have to worry about running a 35.
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Old 04-18-2009, 05:28 PM   #18
zeropsi
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Quote:
Originally Posted by godforbid67 View Post
im confused i thought all gt30r's had 52mm compresser wheels? or are they 52 lb wheels or something? thats different from compresser wheels.
what is the difference between the two???
me is confuuused.

Chris
PM'ed you back.
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Old 04-18-2009, 10:07 PM   #19
godforbid67
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PM'ed you back.
Yeah man, thanks.
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