TurboTim

iTrader: (9)

Like the title says,

How does a GT3267 spool on a 1.8 Miata? I think some here are using this but I do not remember who. I'm looking for "I get xxx psi at xxxrpm" kinda response here please. Thanks.

And if anyone can point me to some place that explains how to read/choose turbine (NOT COMPRESSOR) maps, that'd be great too.

y8s

iTrader: (8)

dont you mean "two"?

the closest thing we can do is point you to garrett's half-assed turbine maps. there might be an autospeed article or some posts on miata.net from jason cuadra on it....

Braineack

iTrader: (62)

sounds like Tim is itching for power...

turbopezz

doesnt andyfloyd have that turbo.

tylerdurden

I seem to recall Andy using that turbo on his 1.9L and getting 16psi @ 3800-4K RPM.

TurboTim

iTrader: (9)

Thanks. I've searched google a little for some info on turbine maps, but most of the hits are of people asking the same question I did and people replying with explainations of Compressor maps. Boo. Actually there are some interesting articles on turbine maps for jet engines, but nothing applicable to automobile otto cycle engines.

Yes, I am itching for more power, as we all are. Problem is, I see a bunch of garrett compressor maps that overlap (GT1548, GT2052), but there are sizeable differences in turbine maps. I understand that the 'higher' the turbine map, the slower the spool but the more hp potential due to a freer flowing exhaust side. But how to determine what size is correct (ie: what A/R ratio to choose, etc)? WTF is with the single line? How would you ever know what the pressure ratio is of the exhaust side? Why the **** do exhaust side maps have lower "lb/min" than intake sides? You'd think that what goes in, must come out. Ehh....

I figured I'd try to match up exhaust sides of turbos that I know other people have used with success on 1.8 engines.

Two of the GT1548's would match up very closely to the GT2560 that I've used on my 1.6 (old GT28R, spools instantly on my 2.2 subaru daily driver). Seems a little tiny for peak hp...FM gets what, 260ish with these?? I want around 280.

Two of the GT2052's would match up with the larger .86 A/R GT2860RS (disco potato) and to the GT3267. But would this kill bottom end/spool (hence my original question!)? There's a very sizeable difference between my GT1544's and the GT2052's...almost twice the size. Yeah, my turbos are that tiny. No, I don't want 4 turbos. These "way undersized" turbos made 240-ish rwhp, so that makes me think that one size up is a perfect compromise...but I really don't want to redo this entire setup again next year (that'd be the 5th year in a row). Having the capability to go with big HP numbers isn't that appealing because eventually I would do it . I do not want to redo the drivetrain/trans/rearend/built engine/etc. All that **** is new and I don't want to think about it again.

If you read this post, thank you. I rarely ever read long replies. ha.

TurboTim

iTrader: (9)

Right, me too, but I'm not postive on that. Seems like a perfect setup for me, but I really really really don't want to get this wrong again. Garrett people seem clueless (or reluctant to think about it) when I call them. I guess I'm small fries compared to other users.

y8s

iTrader: (8)

I thought Andy was running the 3071 or maybe the 3076...

fwiw, my hotside is the NS111 / potato turbine section with the .64 A/R housing. If the compressor was a little smaller, it'd probably spool like mad.

y8s

iTrader: (8)

oops wait.

https://www.miataturbo.net/forums/member.php?u=197

GT3271

TurboTim

iTrader: (9)

Thanks Matt.

I was lying in bed this morning thinking about this and remembered you had a larger turbo that seemed to spool well and was a good match. I don't know why I didn't think of asking you before...it was late last night. And here you are posting your info, thanks.

I'll have to do more research on the disco potato / .64 hotside. What is your turbo (hotside/cold side)? Is it the straight-up disco potato? Garrett seems to have a dozen turbos all around that size with minor tweaks.

magnamx-5

iTrader: (7)

2scoopsofhooah will be running a 3070 some odd soon as well

y8s

iTrader: (8)

http://gallery.y8s.com/miata/turbo/gt25/

A little history since people ask... when I got this turbo, it was one of two available "GT" 25 sized turbos with all new aero designs on both sides and the CHRA was all-new with the new style ball bearings. That was like 5 years ago. Garrett since updated GT to mean any old ball bearing turbo, not just the new ones. I think it even pre-dates the potato, but I forget. I wanted the new technology. Look at the compressor housings, it is pretty apparent that something changed.

http://www.turbofast.com.au/GTseries.html (705330-0001)

The compressor was big but not ridiculous compared to a TO4E-XX. It's actually only .05" bigger in diameter. Similar in size to a TO4E-46 which was a pretty popular upgrade for the 3SGTE in the Alltrac and Turbo MR2. A shop would drop that onto your CT26 and you'd go like mad.

I think the reason Garrett says "not recommended" is that it operates pretty close to the surge line. It's probably a little too much compressor for the smaller turbine, but since the NS111 GT25 hotside is a little bigger than a T25, it worked out OK for me.

Believe me it was hard to shell out that kind of money for a turbo nobody'd ever tried.


Matt

TurboTim

iTrader: (9)

Did you even try it with the .86 A/R turbine? Or swapped the .64 from the get-go?

turbopezz

is anybody runing a ''disco potato'' if so how does it spool .

Ballistic

This might help you decide whats best , we use this for all our turbo decisions .

Turbo compressor calculator

I already put in the bore and stroke .

I have It setup for 8psi as of now . With a 90% VE being that you are turbo at the MIN . And 3000 rpm . Just pull up the GT32 in the maps and you will see you will be right at the surge line .

Just need to change MANIFOLD PRESSURE and RPM then pick a turbo map and you can see when it will start to spool and when you run out of room for more boost .

Best thing is to set a HP goal . Punch in altitude , SFC and target AFR ...and then base your choices around that and pick the best setup for your goal with the best spool .


Hope this helps

y8s

iTrader: (8)

it came with the .86 but I managed to talk ATP into doing a straight swap one day. I drove it down there and they handed me a .64. Never ran the .86--can't imagine it'd be good under 2.4 L

TurboTim

iTrader: (9)

Pretty cool, some of the maps aren't loading though. And no info on the Turbine maps. Thanks for the info anyways.

TurboTim

iTrader: (9)

I see.

When/how does your car spool? You were running 8psi at dyno day? When do you start to spool (make ~1psi) and when are you making 8psi? Thanks again Matt.

y8s

iTrader: (8)

I made a graph from my 8 psi datalog...