Godspeed turbo selection help
 

Been searching for 3-4 days now trying to get my answer before i make a thread.. but i still need some help. I plan to order a turbo soon so i can start making my exhaust mani.

Heres the plan, quick and dirty (:giggle:):





Here are the ones i cant decide between. (ive been reading up about trim and a/r as much as i can to get a better understanding about how its measured and i guess you could say im still kinda lost...:loser:) I chose to go with godspeed b/c of the increasing positive things people have said about them, as well as (journal bearing) china chargers. So if you could, can you please help a brother out... any help is appreciated!


T3/60-1 TURBO CHARGER .63ar( BIG SHAFT)
Compressor trim: .70ar
Compressor Wheel diameter: 56.83/ 74.96
Turbine Wheel diameter: 61.37 /69.86
Exhaust Trim: .63ar
Turbine flange type : T3 flange



T3T4 turbo .50ar (quick spool)
Compressor trim: .50
Compressor Wheel diameter: 53.87 / 76.58
Turbine Wheel diameter: 56.41 / 64.93
Exhaust Trim: .50
Turbine flange type : T3 flange



gt35 turbo charger .63ar
Compressor trim: .70 ar
Compressor Wheel diameter: 57.36 /81.87
Turbine wheel diameter : 57.50 /73.60
Exhaust trim: .63ar
(although i believe from wat ive read this turbo will be too big and laggy for my goals)



not 100% sure on this bad boy yet. i read somewhere (dont remember) that turbos with small turbines and large compressors have problems spooling... ive also been reading some interesting things about .48 a/r's on miatas....
T66 turbo charger .48ar
Compressor trim: .70 ar
Compressor wheel diameter: 65.55 /82.00
Turbine wheel diameter: 45.74 / 62.86
Exhaust Trim: .48 ar
Turbine flange type: T3 flange

again, thank you in advance.

i think 1 or 3. 1 might be the most responsive of the two since the compressor is smaller and the turbine is bigger. are you keeping ac and ps? that limits your manifold options.

sorry that slipped my mind. car will not have either, id love to take it out now, but i wouldnt wanna rip apart my rack, since its my current daily, (will get another DD by the time motor build is done)

thanks!

T3/60

or GT35 baby!

hp or whp?
big difference.

if you want maximum "under curve" as suggested by your spool goals, I'd max out a 2871 on e85. should get you 350 maybe even more.

Sav pulled just over 350whp @ 17psi on E85 w/ a 2871, so OP should not have a problem duplicating those numbers, IF he uses the correct hot side parts, of course.

But seriously, Vlad said it, we need some more information.

Also, why a china turbo? There are consistent dynos that show Great-Wall-of-Turbos making MUCH less torque than the OG turbos. In some cases nearly 100wtq difference @ 4k-rpm. If OP wants to spank evo's, he might want to spend some cash on a OG turbo (I mean come on, he's dropping coin on a tubular exhaust manifold and custom intake manifold. Don't be a cheap ass)

EDIT: Get a fucking EFR!!!!!!!!

or a holset

Where is my new turbo!!!!! I'm waiting for PM!!! Need turbo on foxxie


2871 @ 40psi for 432hp on e85 FTW evo style!

didn't get a chance to get to the shop today. I'll pm you when I haz pics

My Godspeed made awesome torque.

I guess that makes you the example, not the rule. It's not just consistent lack of torque, but lack of...everything. Look at the dyno of Railz and Savington, 2871 vs. china 2871. It will make your boner go away.

I mean this with all due respect, I mean come on, I have a chinaturd on my car right now :giggle: (placeholder)

OP, don't cheap out. Built motor, tubular exhaust manifold, custom intake manifold; you owe it to your car to get a bad ass turbo.

EFR, Holset, Precision, WIN

well im assuming their ratings are in bhp. so i suppose im talking about bhp.

i also didnt want to start with a turbo that i would already be maxxin out at, no fun in that! ;) i would also like a little bit of head room.




DIY, im a poor college student, i just know some people who can help, and that'll help the budget. im willing to save up and built all the other little parts, i just like to mess with shit.... but the turbo i want is too baller for my budget.. And ive read enough to jump on the "bandwagon" i suppose and bite the bullet.


So i've read!

Bah I trust you I no need pics

My chinacharger made good torque too.


But that's not the point here, you want potential for more than 375 yet you want 4500rpm full boost.


A compromise will have to be made. Period.

this is where i had a problem trying to figure out what can i make the most hp with, but within staying in my spool goal. with just reading ar #s and trying to decipher it all!

so, then i guess i am now asking is do you think any of those will make start spoolin around when id like?



Edit: idk if this clears anything up. But im not trying to pull those nubers immediately, id have plenty fun with 300-325 for a while, id just like something with more. So im not stuck wanting to buy something bigger 2 months down the road. Im also trying to learn what the real hp rating of these would be. 18psi made 307 hp on a turbo rated for 500 hp. So idk wat im missing here. Lol

the more i look at this thread and his dyno plot the more i wanna say fuck it and go big or go home. but i dont know if i gots the bawls. lol



and if the dyno plot thingy doesnt work, its cause your not logged into m.net.. it was only put up as an attachment.

the turbos are rated in chp
we usually talk in whp

not the same thing.
307x(roughly 25%)= 384hp
Plus I was on a log mani, internally gated, ran low boost and low timing for the turbo and fuel I was working with.

But don't look at my car as an example, I was nowhere NEAR really pushing the setup, and did a bunch of things just to stay safe/streetable/etc.

Had I gone with a proper exhaust mani, t3 hotside, ewg, ran like 20psi with timing in the 25* (like you could easily do on e85) and basically PUSHED my car I would have made much much more power.

Thing is, I didnt cause I was plenty happy with how it was. I executed the car for my goals and chose to do some things differently for my own reasons.


You could easily reach your goals with a properly set up 2871 or 3071. The 28 will spool more to your liking.

Wow, if I could run 25* @ 5500 RPM @ 20psi it would be fucking awesome. I would love to have one number across all my boost rows lol

With e85 that's completely possible.
Though 1 number accross all rows doesn't mean shit besides a pretty table.
You want to maximize the curve not make the table pretty.

Righteo. I was just sayin'