nufi

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

18psi

iTrader: (76)

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.

Savington

iTrader: (31)

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.

nufi

How too big ? How the turbo spool ?

Savington

iTrader: (31)

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.

levnubhin

iTrader: (30)

Hmmm, Im at 16psi by 4200 rpms with my 2871 on my 1.6. My turbine is a .64 though.
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hustler

iTrader: (6)

Yes. Too big

Splitime

iTrader: (24)

I like mine just fine. Kthnxbye.

nufi

I gona try change for a :

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

or
2º
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)

levnubhin

iTrader: (30)

What are your goals? What do you plan to do with the car?
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nufi

Street road ( maybe a drift too )

Savington

iTrader: (31)

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.

nufi

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

Splitime

iTrader: (24)

Here is a gt28rs .86ar hotside on a stock 1.6l

nufi

The full boost is at rpm ??

neogenesis2004

iTrader: (12)

He's hitting full boost there at about 4400rpm and he had a damaged turbine wheel when he did that dyno.

nufi

Is this car ?
YouTube - WMHM8 Miotta In Car part 1

18psi

iTrader: (76)

what is so funny?

Savington

iTrader: (31)

I rest my case.

neogenesis2004

iTrader: (12)

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.