is a straight T3 too small?

**cf_z** · 2-16-09, 20:39

i know practically nothing about turbo sizing, and i am not even going to act like i do.

Is a T3 too small for a DE on low boost? (10psi or less)?

I have read about other people saying that there is one turbo (i think it starts with gt...?) that is perfect for our 2.5.

if anyone wants to sum up what size turbo's are good for like top end, spool up fast, wont be sufficient, ect, i think many of us who dont know any better could benifit

**Chefsp0t** · 2-16-09, 20:45

Garrett GT35R for the win!

I think that a t3 turbo is a little small for our car though colin.

I know my power goals are different than yours but I am probably going to buy a ceramic ball bearing turbo because they spool faster than regular turbos so you can get a slightly larger one.

**cf_z** · 2-16-09, 20:51

Quote:

Originally Posted by Chefsp0t

Garrett GT35R for the win!

YIKES> what about us without 1k + to spend on a turbo?

and all of the gt35r's i see have that goofy 4 bolt round downpipe flange

**MazdaMiester** · 2-16-09, 21:28

what size T3? a 60/63 on 10psi wouldn't be too small.

Zach · 2-16-09, 23:23

Quote:

Originally Posted by MazdaMiester

what size T3? a 60/63 on 10psi wouldn't be too small.

on a V6 it might be a bit too small. I would check out holset turbos....hx/hy/he35

**MazdaMiester** · 2-16-09, 23:40

I wouldn't think a standard 60 trim T3 would be THAT much too small. yeah, i know it IS too small, but as far as straight T3's go, none are bigger and it wouldn't be as bad as even the stock IHI on a first gen. I think he's working on a budget hence the using a regular T3. a cheap holset, IE HY35 is still an easy 2 bills.

Zach · 2-16-09, 23:46

If he didn't want to pay for a GT35, he could opt for the "T3/T4" hybrid...basically same thing as the 35. T3 frame, TO4 compressor wheels

**MazdaMiester** · 2-16-09, 23:52

Pft, one said nothing of a hybrid or any mention of T04 anything. As far as cost is concerned an HY would be the way to go. I do believe. Besides, If hes budgeting what turbo gets installed, then he probably has a stock engine, and a stock engine can't use a GT35 for very long. the volume and pressure that turbo likes is rod destructing territory.

Zach · 2-16-09, 23:54

Quote:

Originally Posted by MazdaMiester

Pft, one said nothing of a hybrid or any mention of T04 anything. As far as cost is concerned an HY would be the way to go. I do believe. Besides, If hes budgeting what turbo gets installed, then he probably has a stock engine, and a stock engine can't use a GT35 for very long. the volume and pressure that turbo likes is rod destructing territory.

you do realize that the GT35's are "hybrids" using TO4 compressor wheels...right?

The GT28 is a T25 frame with T3 compressor wheel

**MazdaMiester** · 2-16-09, 23:56

yeah? That still doesn't mean that a GT35 wants to hang out at 10psi.

**mm2587** · 2-17-09, 20:17

Quote:

Originally Posted by Chefsp0t

Garrett GT35R for the win!

yes I agree gt35r all the way...If your power goals are 400+hp. For his setup I would say gt3076

Quote:

Originally Posted by cf_z

YIKES> what about us without 1k + to spend on a turbo?

and all of the gt35r's i see have that goofy 4 bolt round downpipe flange

mr2oc.com has two gt35 going for 750 used right now. If I could sell my gt30 I would buy one in a heartbeat. The 4 bolt flange is win. Almost zero worry in regards to warping. Its simple and elegant. If you don't need the extra room for an internal gate why flange for it? even better are v-bands.

Quote:

Originally Posted by Zach

If he didn't want to pay for a GT35, he could opt for the "T3/T4" hybrid...basically same thing as the 35. T3 frame, TO4 compressor wheels

T3/t4 will never be close to a gt35r in anything but dimensions. The newer gt designs are just so much more efficient. I'd look at a gt32 (journal bearing turbo) if you want something gt35 sized for less cash and wanted a garrett. What I would really do though is buy a holset.

Quote:

Originally Posted by MazdaMiester

yeah? That still doesn't mean that a GT35 wants to hang out at 10psi.

QFT. How dare anyone own a gt35r and not run at least 15psi through it. 20+psi is preferred

**MazdaMan88** · 2-17-09, 23:18

Quote:

Originally Posted by cf_z

YIKES> what about us without 1k + to spend on a turbo?

and all of the gt35r's i see have that goofy 4 bolt round downpipe flange

A friend of mine bought a full ball-bearing turbo with the exact same specs as a GT35R for $650 new. It's been super-dependable (two blown heads on a high-dollar interference motor and the turbo is in perfect shape).

I'll find out where he got it and post it up.

**KING6** · 2-18-09, 21:40

Quote:

It's been super-dependable (two blown heads on a high-dollar interference motor and the turbo is in perfect shape).

sounds like the motor cant handle the turbo

**MazdaMan88** · 2-19-09, 1:26

Meh...not really. There were actually three blown heads. It's two parts shotty machine work from a supposedly reputable company and one part stupid mistake. My friend sourced a block and head from DH Racing, and the guy didn't hot tank the block before shipping it back, so the metal shavings that had caked up in the oil passages broke loose and ko'ed the motor (head #1). The second time, the guy replaced the head, only to have a valve seat break loose on the dyno and snap the heads off two of the valves (head #2). The third time, my friend did the head work himself and installed 1mm oversize valves, but didn't take the oversizing into account when he bought the pistons, so the valve reliefs were too small. After his third run down the drag strip on 7 psi (fantastic run. A 12.6 launching soft on stock axles with slicks, and carrying a full interior and all stock body panels), the piston beat the head off a valve right through the lights (head #3). Surprisingly enough, the pistons didn't have so much as a crack in them in the last two motors. He used Probe Industries pistons.

It's a crazy strong motor, though. Since the two escapades with DH Racing, he's done all the machine work himself, save for having the block sleeved. The whole thing has been built in a 1-car garage and his yard, and he's paid for every dime ($15k in the motor alone) by working his tail off. I'm pretty darn proud of the guy.

monkeyhead · 2-19-09, 19:08

I don't know much about these cars. I just joined to do some research because I'm thinking about buying a 2g mx6. But I have been into the old 80's turbo dodges/chryslers for a while now. They use 2.2 4 cyl with a garrett T3 or a 2.5 I4 with a mitsu TEO4H right from the factory. I just recently got a garrett T3 with a .48 A/R for my 2.5T lebaron and it spools fast and hard 14psi by about 2400 rpm. So I think that size should work wonderfully on these 6 cylinder cars. Especially with the larger A/R exhaust housing.