New Garrett Gtx2860R / 2863R / 2867R

[scotty nm35]

His motor is built, just waiting on some fittings to be dropped back in. Should be epic on a stock looking bay.

[etang789]

His motor is built, just waiting on some fittings to be dropped back in. Should be epic on a stock looking bay.

Any updates?

[mr skidz]

gtx2860's would be perfect on my 2.8 on E85 i reckon!

just gotta find someone to do the -5 .60 a/r comp cover sleeve job, any suggestions?

who's trustworthy enough not f@#k it up!

Edited June 10, 2015 by mr skidz

[anon32]

gtx2860's would be perfect on my 2.8 on E85 i reckon!

just gotta find someone to do the -5 .60 a/r comp cover sleeve job, any suggestions?

who's trustworthy enough not f@#k it up!

Is it not worth just going with the 63 instead so you don't need a sleeve?

On compressor map there is a difference but I think it would be negligible on road.

[mr skidz]

I reckon the 60mm Billet would be worth every bit the hassle and hit say 600 horse at the wheels faster than a 63 would and I'm not sure I want any more than that I would rather max a 60 mil wheel out rather than have a 63 and push it 70%.

Most importantly I'm after longevity reliability

[anon32]

I would love to see some of the 63s on GTRNUR's 3.4l open deck motor talk about response and making nice controllable power

[mr skidz]

63mm comp wheel really would be better off with a 61 to 63mm turbine wheel to match.

Garrett should get their act together and make one up.

how hard is it

slight mismatch atm

Edited June 11, 2015 by mr skidz

[Piggaz]

They do a "GTX 2967". Slightly larger rear wheel but not with the GTX 63 mm front wheel.

Close :\.

[mr skidz]

The idea of using the smaller standard GT-R comp housing with the billet 60 mm wheel which is easier to do.

I imagine the response there would be pretty awesome just not sure about how efficient it would be at 25 + psi I would imagine the heat would be a major side effect but I so would like to try that just for shits and giggles.

[mr skidz]

They do a "GTX 2967". Slightly larger rear wheel but not with the GTX 63 mm front wheel.

Close :\.

I did notice they made that rear wheel option but apparently the shaft is a different size and will not fit the smaller front wheel which has got me stuffed y? that would be the tits I reckon.

[anon32]

63mm comp wheel really would be better off with a 61 to 63mm turbine wheel to match.

Garrett should get their act together and make one up.

how hard is it

slight mismatch atm

You would loose the response then wouldn't you?

[mr skidz]

You would loose the response then wouldn't you?

well... I think the initial pick up/ spool time will be slower maybe 100-300rpm but billet wheel may now cancel this out being lighter or maybe not as it grabs a bigger handful of air every times it spins which requires more torque/force from the exhaust wheel.

BUT once the slightly bigger turbine wheel starts building boost, that bigger diameter wheel has much more leverage force which in turn gives that compressor a larger more rapid shove to reach its intended rpms for better on boost response.

There's less restriction with bigger turbines as they are better at expelling the wasted exhaust gases without choking up the exhaust side just like a small exhaust system would slow down your compressors ability to ramp up FAST.

which affects RESPONSE.

Thats why -7s -9s -5s are so popular and gt2871 or -10s are not.

I had a 2871 it was good for outright power but choked itself to death after 1.4bar and that was a .86 rear housing too!

hope you can understand why sometimes slightly bigger exh wheels not too big!

can work in our favour

sorry if I rambled a bit too much tired from work.

[anon32]

Awesome reply

[mr skidz]

Awesome reply

thanks

[XGTRX]

well... I think the initial pick up/ spool time will be slower maybe 100-300rpm but billet wheel may now cancel this out being lighter or maybe not as it grabs a bigger handful of air every times it spins which requires more torque/force from the exhaust wheel.

BUT once the slightly bigger turbine wheel starts building boost, that bigger diameter wheel has much more leverage force which in turn gives that compressor a larger more rapid shove to reach its intended rpms for better on boost response.

There's less restriction with bigger turbines as they are better at expelling the wasted exhaust gases without choking up the exhaust side just like a small exhaust system would slow down your compressors ability to ramp up FAST.

which affects RESPONSE.

Thats why -7s -9s -5s are so popular and gt2871 or -10s are not.

I had a 2871 it was good for outright power but choked itself to death after 1.4bar and that was a .86 rear housing too!

hope you can understand why sometimes slightly bigger exh wheels not too big!

can work in our favour

sorry if I rambled a bit too much tired from work.

Is this why you get more transient response in between gear changes, in that the larger wheel has more momentum? I remember vaguely a discussion that implied that even though a turbo with a larger exhaust wheel is laggier to build up boost is less prone to falling off boost on gear changes.

[mr skidz]

I think any amount of turbine momentum even if it's a small amount it's got to be good..

but I do think it's probably more to do with a big compressor trying to turn hard and fast which it can't do because it doesn't have "enough" help from a smaller turbine wheel there's just not enough torque applied.

In relation to keeping the momentum of the turbo up between gear changes all I would say is run a very well return style blow off valve and aim the return/discharge port directly into the compressors intake path.

[sneakey pete]

So what housings and other parts exactly are being used to make up these theoretical GTX2860 turbo's?
Probably wanting to put a set on my car later on in the year so will need to know what to ask for when i go to get them made up.

[mr skidz]

read meatheads posts in this thread he's the only one who has done it so far that I have read.

the whole notion that gtx cartridge can fit dash 5 housings was brought to my attention by pigaz.

after gcg told me personally that it was just not possible.

Edited June 12, 2015 by mr skidz

[mr skidz]

maybe we should do a group buy for machined comp covers?

would anyone be keen?

[anon32]

read meatheads posts in this thread he's the only one who has done it so far that I have read.

the whole notion that gtx cartridge can fit dash 5 housings was brought to my attention by pigaz.

after gcg told me personally that it was just not possible.

Same thing they told me