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Old 08-26-2014, 03:31 PM   #1
kred
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Join Date: Mar 2013
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2006 Legacy GT LTD
OBP

Default Which turbo should I get??

My built motor is in and running healthy as I break it in. Here's what it's got:

EJ255 case halves
100mm Bore (+.5mm), 8.9 CR
Wiseco Pistons
Manley Turbo Tuff Rods
King XPG bearings
OEM nitrated crank shaft
Stock D25 heads & stock cams
ARP heads studs & stock HGs
11mm oil pump
Killer B oil pickup
Tial 38mm EWG
VF52 for break in
Full catless exhaust and supporting fuel mods

I'm trying to find a good turbo for my set up. I'm shooting for 400-450 whp on 91 pump gas, maybe 500 + on C16 if I track it. I went with stock D25 heads on my motor because I heard they flow really well for stock heads and head work is expensive (I wouldn't be revving past 7500 tops anyway). I'm gonna want a rotated set up, reverse intake manifold, and a front mount with custom piping. Now the big question is what do I need for a turbo? I've done a lot of research, but my build is gonna be unique. I had my eye on garrett turbos for a while (GT35r). But now I'm leaning more towards Precision turbos (PT6266). I'm craving a really good deal I found on a Precision 6266 ball bearing. This should spool sooner than the GT35r, and has more potential too. So what do you guys think?
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Old 08-26-2014, 04:31 PM   #2
ALOKIN
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440whp on teh moonshine

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I think you should move somewhere with better gas.....
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Old 08-26-2014, 04:58 PM   #3
kred
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Lol, I know right? Stupid Maine getting rid of their 93. Wish we had e85.
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Old 08-26-2014, 07:31 PM   #4
Uncle Scotty
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100000% id get an alky injection system

wouldnt even hafta think about it

and the terbo choice would depend on that...or not
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Old 08-26-2014, 07:46 PM   #5
A-man07
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Overbored and high compression + 91 pump isn't a good recipe for safe 450whp. 11mm oil pump too. Really on 91 with your build you should be running a very conservative tune and low boost.

For your power goals the 6266 or the GTX 35R are good choices but you'll need plenty of octane to keep that engine from exploding. Meth injection and pray the equipment doesn't fail.
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Old 08-28-2014, 11:44 AM   #6
kred
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Would I be able to buy meth locally? What does meth cost per gallon? Is my gas mileage gonna take a hit with it like going e85?
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Old 08-28-2014, 01:36 PM   #7
Uncle Scotty
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Quote:
Originally Posted by kred View Post
Would I be able to buy meth locally? What does meth cost per gallon? Is my gas mileage gonna take a hit with it like going e85?
i see you have lots of not beeing sp00n fed to do here.....

ya best get crackin on yer research....that hi-comp motor wont last long on 91
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Old 08-28-2014, 02:59 PM   #8
Back Road Runner
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Are you going to run to 8k to flow enough air to reach such HP numbers?

Your CR should be 8:1 to let you run a reasonable amount of boost. The higher the CR, the lower the boost you can run before detonation. For 21psi you'll want to be down near 8:1 with many aftermarket options at 8.2:1. You may very well have problems even reaching 21psi at all with that 8.9:1 setup, and that means less torque and less hp forcing you to rev higher to get it. Do you want to run to 8500 or 9000 rpm to make 450whp because that's what you'll need for air flow to produce that kind of power when you're only pushing high teens for boost.
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Old 08-28-2014, 03:05 PM   #9
ScoobyRue
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Quote:
Originally Posted by Back Road Runner View Post
Are you going to run to 8k to flow enough air to reach such HP numbers?

Your CR should be 8:1 to let you run a reasonable amount of boost. The higher the CR, the lower the boost you can run before detonation. For 21psi you'll want to be down near 8:1 with many aftermarket options at 8.2:1. You may very well have problems even reaching 21psi at all with that 8.9:1 setup, and that means less torque and less hp forcing you to rev higher to get it. Do you want to run to 8500 or 9000 rpm to make 450whp because that's what you'll need for air flow to produce that kind of power when you're only pushing high teens for boost.
... So it begins....


Higher compression = less boost yes. But what happens when you run more boost on high compression...... How dare I right?

You make more power with higher compression and more boost. Yes knock can become an issue, so run e85, problem solved.

Dont have E85 run meth.
Dont have meth, run 93 with less timing.
Dont have 93, run 91 with less timing.
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Old 08-28-2014, 08:19 PM   #10
nsanteramo
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God do I feel your pain. Gas here in Maine is god awful. I'm in the same boat as you. Ever consider running meth to help with detonation? Could do both at the same time seeing you'd need a new tune for each anyway
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Old 08-29-2014, 01:01 AM   #11
Uncle Scotty
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Quote:
Originally Posted by ScoobyRue View Post
... So it begins....


Higher compression = less boost yes. But what happens when you run more boost on high compression...... How dare I right?

You make more power with higher compression and more boost. Yes knock can become an issue, so run e85, problem solved.

Dont have E85 run meth.
Dont have meth, run 93 with less timing.
Dont have 93, run 91 with less timing.


cupcake.....s00bar00z blow the **** up in a half a heartbeat even with good fuel

running 9:1 on 91 is a crapshoot to start with....add somebody who dont know how to tune and ya blow it sky high in a pull or 2
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Old 08-29-2014, 01:44 AM   #12
jeffk182
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Atleast you don't have California 91 hahaha. Our fuel sucks. I need to add meth injection when I can afford it. Don't trust our fuel even being only stage 2.

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Old 08-29-2014, 08:15 AM   #13
ScoobyRue
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Quote:
Originally Posted by Uncle Scotty View Post
cupcake.....s00bar00z blow the **** up in a half a heartbeat even with good fuel

running 9:1 on 91 is a crapshoot to start with....add somebody who dont know how to tune and ya blow it sky high in a pull or 2
I come from the tuning community so I would assume people know how to take away timing. Lezbehonest, these are subie owners we are talking about, good point.
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Old 08-31-2014, 12:59 PM   #14
kred
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Went ahead and got the Precision 6266.
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