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Old 09-05-2009, 11:05 PM   #1
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Default Miata 1.6 + GT28RS BB ??

Hello.

I'm new on this forum, and my english is very bad

So, i have a 1.6 miata turbo with this setup:

-Megasquirt Pnp ECU
-430cc Supra Bi-turbo Injectors
-KnockSenseMS
-Dyn Dual Feed Rail
-AEM Wideband
-Complete XTD Racing clutch kit & light flywheel
-Wiseco Turbo pistons 8:5
-ARP Head Studs
-Forged Connecting Rods
-Mazda 323 Turbo PCV Valve
-Intercooler

Now i buy a new turbo:

TURBO GT28RS BALL BEARING
0.60 A/R
TURBINE: .86 A/R
TRIM: 60


I liked your opnion about this configuration

Best regards
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Old 09-05-2009, 11:07 PM   #2
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Opinion on what?
And what are you looking to accomplish with the car? Drag? Road race? Street car?

Because that is a fairly large turbo for a 1.6, and if you're looking for quick spool or good midrange you might want to look into something smaller.
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Old 09-05-2009, 11:14 PM   #3
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I've driven that exact setup, down to the turbine A/R. That turbo is too big for a 1.6, IMO. You want to be looking at a 2560R, or a built 1.8 motor.
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Old 09-05-2009, 11:17 PM   #4
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Quote:
Originally Posted by Savington View Post
I've driven that exact setup, down to the turbine A/R. That turbo is too big for a 1.6, IMO. You want to be looking at a 2560R, or a built 1.8 motor.
How too big ? How the turbo spool ?
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Old 09-05-2009, 11:27 PM   #5
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The turbo spool was pretty bad, worse than I would want to live with on the street or the track. My 2871R with the same .86 A/R turbine housing on my built 1.9 liter spools much faster. The 2860RS on the 1.6 wouldn't kick hard until after 4500rpm, and there was a serious lag in power after every shift as well. Simply too big for the motor. My 2871R with another 250cc of displacement is at full grunt by 4000rpm, and while there is a small delay between shifts, it's about half of what the 1.6/2860RS was.
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Old 09-05-2009, 11:32 PM   #6
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Hmmm, Im at 16psi by 4200 rpms with my 2871 on my 1.6. My turbine is a .64 though.
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Old 09-05-2009, 11:37 PM   #7
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Yes. Too big
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Old 09-05-2009, 11:48 PM   #8
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I like mine just fine. Kthnxbye.
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Old 09-05-2009, 11:49 PM   #9
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I gona try change for a :

1
T3
. 48 A/R COMPRESSOR
.60 A/R TURBINE
.60 TRIM

or
2
GT25 (BALL BEARING)
0.60 A/R
TURBINE: .49 A/R
TRIM: 55

????
What is the best in your's opinion ? ( for the 1.6L)
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Old 09-05-2009, 11:51 PM   #10
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Quote:
Originally Posted by nufi View Post


I gona try change for a :

1
T3
. 48 A/R COMPRESSOR
.60 A/R TURBINE
.60 TRIM

or
2
GT25 (BALL BEARING)
0.60 A/R
TURBINE: .49 A/R
TRIM: 55

????
What is the best in your's opinion ?
What are your goals? What do you plan to do with the car?
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Old 09-05-2009, 11:53 PM   #11
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Quote:
Originally Posted by levnubhin View Post
What are your goals? What do you plan to do with the car?
Street road ( maybe a drift too )
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Old 09-05-2009, 11:53 PM   #12
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That T3 might work, although I'll let Scott comment on the exact size since I'm not a T3 guru.

You want that GT25 (.60 comp a/r = GT2560R) with a .64 turbine A/R, NOT the .49 turbine A/R.
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Old 09-06-2009, 12:02 AM   #13
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Quote:
Originally Posted by Savington View Post
That T3 might work, although I'll let Scott comment on the exact size since I'm not a T3 guru.

You want that GT25 (.60 comp a/r = GT2560R) with a .64 turbine A/R, NOT the .49 turbine A/R.
But the seller only have this 3 turbos

I buy the gt28, but maybe i can speak with him to change.

In your opnion, who make a better street car ?

Ps.
Sorry for bad english
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Old 09-06-2009, 12:13 AM   #14
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Here is a gt28rs .86ar hotside on a stock 1.6l

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Old 09-06-2009, 12:26 AM   #15
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Quote:
Originally Posted by Splitime View Post
Here is a gt28rs .86ar hotside on a stock 1.6l

The full boost is at rpm ??
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Old 09-06-2009, 12:32 AM   #16
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He's hitting full boost there at about 4400rpm and he had a damaged turbine wheel when he did that dyno.
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Old 09-06-2009, 02:03 AM   #17
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Quote:
Originally Posted by neogenesis2004 View Post
He's hitting full boost there at about 4400rpm and he had a damaged turbine wheel when he did that dyno.
Is this car ?
YouTube - WMHM8 Miotta In Car part 1

Last edited by nufi; 09-06-2009 at 02:40 AM.
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Old 09-06-2009, 02:57 AM   #18
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Quote:
Originally Posted by nufi View Post
what is so funny?
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Old 09-06-2009, 02:59 AM   #19
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Quote:
Originally Posted by Splitime View Post
Here is a gt28rs .86ar hotside on a stock 1.6l

Name:  blacktraxdyno.jpg
Views: 42
Size:  68.4 KB

I rest my case.
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Old 09-06-2009, 03:20 AM   #20
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What case would that be exactly? Dave is running like 4lbs less than you in his dyno. Plus his damaged turbine isn't exactly helping his spool in that dyno.

Both of you have approx 180tq at redline, you just have more before that because you are running like 15 or more psi. There is not boost plot on your dyno, but it is safe to guess that you hit peak boost near peak tq because of the falloff afterward. IF that assumption is correct it looksl ike you hit peak boost around the same time as well. I think your dyno and Daves dynos would be VERY similar at the same boost.
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