JasonC SBB

http://www.atpturbo.com/mm5/merchant...egory_Code=GTX

Maps here:
https://www.miataturbo.net/showthrea...hlight=GTX2863

jbrown7815

iTrader: (1)

So what does this mean to us noobs? How does this compare to the EFR 6258 turboes?

hustler

iTrader: (6)

These new Garrett GTX turbos seem to show a real performance gain if you "go down one size" because they have similar flow characteristics to the old GT models down low, but "open up" in the mid range and above. At least, that what it looks like compared to the GT2860rs and GTX2863.

85z28

iTrader: (2)

In for more info.

ianferrell

spools like a 2560 but more top end than a 2860? or am I too hopeful

85z28

iTrader: (2)

Needs 2871 version and I'm in.

Savington

iTrader: (31)

They will both have more lag and be less responsive to transient inputs, but the 2867 will probably make more power.

I have been driving a customer's 2871R-powered MSM all week and it is definitely not as responsive as an EFR6258 in the 2500-3500 range.

Braineack

iTrader: (62)

The idea is that the wheel is smaller than the 71mm but out performs it in spool and max output.

the 2863 (63mm), is a 43 lb/min wheel and 78% efficient
the 2867 (67mm), is a 47 lb/min wheel and 79% efficient
the 2871 (71mm) is a 45 lb/min wheel and 75% efficient

85z28

iTrader: (2)

Do they have a map for the 2867 vs 2871?

Braineack

iTrader: (62)

i dunno, you could click the link label "maps"


:failboat:

85z28

iTrader: (2)

Yeah, yeah. I found one for the .56 hotside, but I'm looking for a .86 hotside comparison.

Braineack

iTrader: (62)

compressor maps dont factor in the turbine...

Savington

iTrader: (31)

Garrett doesn't make a .56 hotside, and the GTX turbos all use the current Garrett hotsides. Just the compressor wheel/housing changes.

Savington

iTrader: (31)

BTW, I am going to fiddle with an EFR7064 on Theseus as soon as I can get my hands on the turbo. 70mm compressor that moves 56lbs/min.

85z28

iTrader: (2)

Mistake, 56 trim .68 hotside.

Braineack

iTrader: (62)

it's not a .68 hotside. that's the A/R of the compressor housing used during testing.

85z28

iTrader: (2)

Lol, I'm all sorts of wrong right now. I'll just shutup.

Braineack

iTrader: (62)

you learnededed.

85z28

iTrader: (2)

At least I'll admit when I'm wrong. BTWs thanks for adding the efficiency and lb/min of the different turbos. Really makes me like the 2867.

JasonC SBB

Looking at the maps:

GTX2863 spool will be very similar to GT2860RS (looking at bottom left of map and shaft RPMs). But efficiency at 15 psi is higher and ultimate power is much higher. Win-win-win!