Is GTX2867R Gen 2 a good choice for me?
#1
Junior Member
Thread Starter
iTrader: (2)
Join Date: Mar 2008
Location: Navarre, Fl
Posts: 280
Total Cats: 8
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I know there must be a million of these threads. I've read a few that had good luck with the the GTX 2867R. And one that did not. I'm currently sitting at 220hp/ 229ft/lbs with a sr20 on 15psi. I'm sure I've reached the limit for this turbo. I'm looking to be in the 300-350 HP range and not looking to change my whole set up. I am open to other suggestions as well. Here is a list of my drivetrain mods.
Built motor 1.9ish.
BE oil pump
ACL bearings throughout
Supertech 8.4 pistons with wiseco rings.
K1 rods
BP4W head with stock valves and springs. Port and polished.
ID1000 injectors
LS coils
Flyin miata manifold and downpipe
full 3" enthuza exhaust.
mushimoto radiator with FM stage 2 fan kit.
MSM 6 speed trans. 3.63 rear end.
All tuned on DIYPNP.
Built motor 1.9ish.
BE oil pump
ACL bearings throughout
Supertech 8.4 pistons with wiseco rings.
K1 rods
BP4W head with stock valves and springs. Port and polished.
ID1000 injectors
LS coils
Flyin miata manifold and downpipe
full 3" enthuza exhaust.
mushimoto radiator with FM stage 2 fan kit.
MSM 6 speed trans. 3.63 rear end.
All tuned on DIYPNP.
#5
Junior Member
iTrader: (1)
Join Date: Dec 2018
Location: Dallas/Fort Worth
Posts: 311
Total Cats: 100
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I'm building a nearly identical setup, and the turbo is my last decision. I've seen both the GTX2887R and EFR 6258 mentioned as the best options for a build limited by a 6spd.
I believe everyone considers the EFR superior, and I found it for ~$1400 at: https://www.tcsautomotive.com/produc...29764607017042
Any real reason to still consider the GTX after this?
I believe everyone considers the EFR superior, and I found it for ~$1400 at: https://www.tcsautomotive.com/produc...29764607017042
Any real reason to still consider the GTX after this?
#6
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
The OP has the FM kit. I don't know if the manifold would properly place an EFR turbo forward enough to clear a downpipe. If it doesn't, then he'd have to buy a turbo + manifold/downpipe + having the exhaust re-fitted to accommodate the new downpipe. This could be quite expensive compared to straight dropping in the GTX2867R. If I was starting from scratch, I would go with the EFR any day of the week.
#8
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I think the 2860 gen2 is a better chioce for 300-350 than the 2867.
I have a 2863, but that's a size they don't sell any more (the 2860 gen2 has basically taken over that space):
![](http://www.codrus.com/dyno/synergy-Oct2015/synergy-265.png)
As for EFR vs Garrett -- the EFR is a great turbo, but packaging can be challenging in the Miata and there are fewer off-the-shelf manifolds/downpipes/etc available.
The EFR spools faster which is a big deal for a street car but less important on a track car because you're never below 4000 RPM anyway.
--Ian
I have a 2863, but that's a size they don't sell any more (the 2860 gen2 has basically taken over that space):
![](http://www.codrus.com/dyno/synergy-Oct2015/synergy-265.png)
As for EFR vs Garrett -- the EFR is a great turbo, but packaging can be challenging in the Miata and there are fewer off-the-shelf manifolds/downpipes/etc available.
The EFR spools faster which is a big deal for a street car but less important on a track car because you're never below 4000 RPM anyway.
--Ian
#10
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I think the 2860 gen2 is a better chioce for 300-350 than the 2867.
I have a 2863, but that's a size they don't sell any more (the 2860 gen2 has basically taken over that space):
![](http://www.codrus.com/dyno/synergy-Oct2015/synergy-265.png)
As for EFR vs Garrett -- the EFR is a great turbo, but packaging can be challenging in the Miata and there are fewer off-the-shelf manifolds/downpipes/etc available.
The EFR spools faster which is a big deal for a street car but less important on a track car because you're never below 4000 RPM anyway.
--Ian
I have a 2863, but that's a size they don't sell any more (the 2860 gen2 has basically taken over that space):
![](http://www.codrus.com/dyno/synergy-Oct2015/synergy-265.png)
As for EFR vs Garrett -- the EFR is a great turbo, but packaging can be challenging in the Miata and there are fewer off-the-shelf manifolds/downpipes/etc available.
The EFR spools faster which is a big deal for a street car but less important on a track car because you're never below 4000 RPM anyway.
--Ian
Also I think Garrett did good with the gen2, personally I'm hitting full boost at 3800. I think the 6258 might be slightly earlier but I'm still not convinced the efr is the holy grail of turbos
#11
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I was hoping you would chime in, I always liked your build. Did you ever figure out why your engine was more knock prone? I'm doing something similar to you with my setup to get roughly 100 octane. I'm using race gas concentrate that brings 10 gallons of 93 up to 101 octane and it actually works pretty dang good.
Also I think Garrett did good with the gen2, personally I'm hitting full boost at 3800. I think the 6258 might be slightly earlier but I'm still not convinced the efr is the holy grail of turbos
Also I think Garrett did good with the gen2, personally I'm hitting full boost at 3800. I think the 6258 might be slightly earlier but I'm still not convinced the efr is the holy grail of turbos
A friend of mine is building a track car with a mt.net standard bottom end, VVT head, and a 2860 gen2 with the FM2R plumbing, I'll be interested to see what it makes once he gets it running.
--Ian
#15
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I bought a lightly used gen1 2860 and put a gen 2 housing and wheel on it. The only difference in gen 1 and 2 are the compressor housing and wheel. I spent 250 for the housing and wheel from arashi, Taiwanese company makes really good turbo stuff. Garrett copy of the highest quality. Lol
#18
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I've got the GTX2860RS Gen 1 - with the Tial EWG V-Band housing. I think it's 0.64A/R. Only recent pressure plot I can find is from the Dyno,
6 PSI at 3000RPM
14.5 PSI at 3500RPM
19.6 PSI at 4000RPM
21 PSI at 4100RPM
There's probably a bit more in that by playing with the EBC, but the guy doing the mapping said he thought it was starting to be limited by something at the top end something which I need to look into (could still add in more boost but power was starting to plateau).
Basic spec:
8.6 supertechs, standard VVT head, square top inlet, Begi large intercooler, FM 3" exhaust with the ceramic cat, equivalent of US 92 RON fuel.
6 PSI at 3000RPM
14.5 PSI at 3500RPM
19.6 PSI at 4000RPM
21 PSI at 4100RPM
There's probably a bit more in that by playing with the EBC, but the guy doing the mapping said he thought it was starting to be limited by something at the top end something which I need to look into (could still add in more boost but power was starting to plateau).
Basic spec:
8.6 supertechs, standard VVT head, square top inlet, Begi large intercooler, FM 3" exhaust with the ceramic cat, equivalent of US 92 RON fuel.
Last edited by jonboy; 06-24-2020 at 04:44 AM.
#19
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I've got the GTX2860RS Gen 1 - with the Tial EWG V-Band housing. I think it's 0.64A/R. Only recent pressure plot I can find is from the Dyno,
6 PSI at 3000RPM
14.5 PSI at 3500RPM
19.6 PSI at 4000RPM
21 PSI at 4100RPM
There's probably a bit more in that by playing with the EBC, but the guy doing the mapping said he thought it was starting to be limited by something at the top end something which I need to look into (could still add in more boost but power was starting to plateau).
Basic spec:
8.6 supertechs, standard VVT head, square top inlet, Begi large intercooler, FM 3" exhaust with the ceramic cat, equivalent of US 92 RON fuel.
6 PSI at 3000RPM
14.5 PSI at 3500RPM
19.6 PSI at 4000RPM
21 PSI at 4100RPM
There's probably a bit more in that by playing with the EBC, but the guy doing the mapping said he thought it was starting to be limited by something at the top end something which I need to look into (could still add in more boost but power was starting to plateau).
Basic spec:
8.6 supertechs, standard VVT head, square top inlet, Begi large intercooler, FM 3" exhaust with the ceramic cat, equivalent of US 92 RON fuel.