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Old 12-23-2007, 10:23 AM   #1
Teh Legacy
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Default T3/T04S to GT37R - Projected Gains?

Thinking of swapping out my T3/T04S for a Garrett GT37R (.82 hotside.) My current mods are as follows:

Weisco Coated Pistons
Eagles Rods
ARP Head Studs
Calico Coated Engine Bearings
Ultimate Racing T3/T04S Turbo (.82 a/r)
Ultimate Racing 1000cc Top-Feed Injectors
Ultimate Racing Fuel Rails
Dual In-Tank Whine-bro 255 LPH Fuel Pumps
Fuel Pressure Regulator
Ultimate Racing 3" Down Pipe
Ultimate Racing Up Pipe
TiAL 44mm Wastegate w/ Dump Tube
Perrin Semi-Equal Length Header (wrapped)
Invidia Turbo-Back Exhaust
Ultimate Racing Front-Mount Intercooler
Ultimate Racing Polished Intercooler Piping
TiAL Blow-Off Valve
Ultimate Racing Cold-Air Intake w/ MAF Housing
TurboXS DTEC 4 bar Pressure Sensor
TurboXS UTEC w/ Map Switch
TurboXS Manual Boost Controller
Exedy Twin-Plate Clutch

The car previously put down 431 WHP on 93 octane and 517 WHP on C16. What sort of numbers could be projected from swapping out the UR T3/T04S for the Garrett GT37R? Both are using .82 a/r hot sides, and I'm still running stock heads, cams, and valvetrain for the time being.

Update - The turbo has been offered to me for $900. I may be able to get him a little lower if I try. It's a GT37R with a .82 a/r hot side. You guys think it's worth it? How much power do you think it can put down?
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Last edited by Teh Legacy; 02-01-2008 at 06:09 PM.
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Old 12-23-2007, 10:24 AM   #2
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I could be wrong. But i thought the 37r seemed more suitable for cars with higher rev ranges. Do they make it in twin scroll applications?? If not why not go with a t/s 40r?
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Old 12-23-2007, 10:29 AM   #3
Teh Legacy
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Half the reason for considering the 37R is because I can pick one up from a friend for VERY cheap. If I don't end up getting it, I'll be getting a FP3582HTA.
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Old 12-23-2007, 11:30 AM   #4
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If you end up making the swap I'd be willing to give you some cash plus my .63 housing for the .82 housing off the t3/t04s.
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Old 12-23-2007, 12:37 PM   #5
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Quote:
Originally Posted by LiquidForce View Post
If you end up making the swap I'd be willing to give you some cash plus my .63 housing for the .82 housing off the t3/t04s.

Sounds good.
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Old 12-23-2007, 02:30 PM   #6
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Im going to use the 37r on my car with the .82 as well. Evo's have been making great number with this turbo for a while, so i wanna see what the for extra displacement will do for it... my goal is 600whp and a mid 10 second pass with all the supporting mods.
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Old 12-23-2007, 02:31 PM   #7
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I think going to the 37r you will definitely pick up more power, but your whole power curve is gonna be shifted to the right since its going to be a bit laggier than a t3/t04s... With the 37r you will probably be breaking into the tens with your current setup being low 11's.... good luck with whatever you do let us know how it goes...
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Old 12-23-2007, 04:08 PM   #8
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Meh I'd just get some Headwork and cams
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Old 12-24-2007, 12:02 AM   #9
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Id skip the 37R and just go with a 40R if i were you and was going to upgrade, i've heard that 37R's lag about the same as a 40R and dont make as near much power..
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Old 12-24-2007, 12:22 AM   #10
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Quote:
Originally Posted by STimo View Post
Id skip the 37R and just go with a 40R if i were you and was going to upgrade, i've heard that 37R's lag about the same as a 40R and dont make as near much power..
Agreed!
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Old 12-24-2007, 12:31 AM   #11
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from what I understand on evos the lag is 300 to 500 rpms diffrent then 35r and the 37 will make well into the 600's with some c16, I want to see what it will do with a little more displacement.
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Old 12-24-2007, 06:59 AM   #12
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I found this while looking around for .82 exhaust housings

http://www.ztechz.net/sitebuildercon.../gt-turbos.jpg


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Old 12-24-2007, 07:11 AM   #13
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Quote:
Originally Posted by Teh Legacy View Post
Half the reason for considering the 37R is because I can pick one up from a friend for VERY cheap. If I don't end up getting it, I'll be getting a FP3582HTA.
what about sending the 37r to fp for the hta treatment?
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Old 12-24-2007, 08:07 AM   #14
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Quote:
Originally Posted by Paul View Post
what about sending the 37r to fp for the hta treatment?
The only reason I'm even considering the 37R is because I'm picking it up at an incredible price.
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Old 12-24-2007, 08:33 AM   #15
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Quote:
Originally Posted by PSM-04-STi View Post
Meh I'd just get some Headwork and cams


i second that!
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Old 12-24-2007, 09:07 AM   #16
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I say get the turbo. If it doesn't work for you just sell it.

Head work and cams is neither easy or cheap. I'd wait to see how the turbo performs as is before thinking about tearing a motor down for that kind of work.



edit: All of this is assuming the price is real cheap and it will just bolt up to your current setup. If it requires a new up and downpipe I wouldn't do it as it would no longer be **cheap**
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Old 12-24-2007, 09:53 AM   #17
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Def go with the 40R! The lag is indiffernt between the two but the 40R makes more power. But like mentioned above, a 35R and up size turbo is a high rev setup. Your going to want the room to use and play with the power. Get your valvetrain done. Also have your heads at least gone through. IMO I would def without a doubt get a set of cams. With your goal I would suggest going 280's! Good Luck!
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Old 12-24-2007, 12:16 PM   #18
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It is very easy to swap out a rotated turbo. Get it, and tune for it. If you don't like it, put the old one back on and set the tune back to where it is now.
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Old 12-24-2007, 12:17 PM   #19
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i've got some insite on the 35r .82 to a 35r 1.06 to a 37r 1.06 here you go. and by the way this is on my own car.

35r .82 35psi on c16



here is the comparison of my 37r with a 1.06 to the 35r i swapped back to but with a 1.06 instead of the .82 like last year. the problem with the 37r is that it never got to where i wanted it to be as far as boost wise. i even tried reving the motor out witch helped very little. the torque really sufferd because of the turbo spooling so late witch dropped me about 7 tenths in the 1/4. but with the 35r .82 to the 35r 1.06 they spooled the same witch is a plus to me. i'm changing a few things now to help with spool up and changing a few things to try and keep the boost up to 35-36 psi instead of it dropping off like you see in these dyno sheets. once i get everything straightend around i'd say it will be around 670whp and 600wtq.

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Old 12-24-2007, 12:24 PM   #20
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If you go with the GT40R let your buddy know I would buy the 37r. Mine just craped out on me. Same thing as a T04R or PT63 with the big wheel. The turbo is great and the power is amazing. But if the twin scroll GT4088R spools the same as the GT37R then just get the GT4088R. Vibrant makes a twin scroll manifold that brandon at turbo xs could modify and use 2 waste gates. Little pricey but would be on sick set up.

Or could you just get the T4 divided housing. I have the T4 .96A/R housing and it is great. Go V-band down pipe.

James

PS head work is a must. Hi revs would make this a drivable car on the street. Start saving for that 6spd dog box cause your gonna break that 6spd right after you make 600+. If you don't then your lucky. But have that money set a side cause it is $$$$$.

Last edited by StillBoostin; 02-02-2008 at 08:06 PM.
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Old 12-24-2007, 03:40 PM   #21
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Is it the T3 or T4 version of the GT37r? If its the T3 and you can get it cheap id go for it. The 40r would be the better choice but you would have to change your up-pipe and downpipe to use it, so unless your looking to spend more money I'd just buy the 37r.
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Old 12-24-2007, 04:02 PM   #22
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id say get the turbo, you already have ALL the supporting mods and strength for it, AND getting it at a good price..do it!
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Old 12-25-2007, 12:30 AM   #23
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Hey John....

Rumor is some guy at Andrewtech has a Gt4088R kit for sale.... ;-)

-Edwin
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Old 12-25-2007, 12:54 PM   #24
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Quote:
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Hey John....

Rumor is some guy at Andrewtech has a Gt4088R kit for sale.... ;-)

-Edwin

What's that idiot selling it for? Give me a call bro.
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Old 02-01-2008, 06:09 PM   #25
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The turbo has been offered to me for $900. I may be able to get him a little lower if I try. It's a GT37R with a .82 a/r hot side. You guys think it's worth it? How much power do you think it can put down?
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