Turbo too small?
#1
Junior Member
Thread Starter
iTrader: (7)
Join Date: May 2007
Location: Socal
Posts: 332
Total Cats: 0
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I am planning on boosting my 1.6 miata. MSPNP for tuning. This is a stricly autox/track day car. It is not a daily driver. I am looking for around 200-250 whp. I want a turbo that doesn't run out of steam in the higher rev ranges. There is a garrett 50 trim turbo selling locally for 100. Here is the specs:
freshly rebuilt, there's no shaft play and it spins freely. 50 trim T3 turbo, externally wastegated, .38 a/r, .53 intake and .47 exhaust
Would this work for what I want? Its externally wastegated and I know most people are internally wastegated. Can I revert it back to internal wastegates?
Thanks
freshly rebuilt, there's no shaft play and it spins freely. 50 trim T3 turbo, externally wastegated, .38 a/r, .53 intake and .47 exhaust
Would this work for what I want? Its externally wastegated and I know most people are internally wastegated. Can I revert it back to internal wastegates?
Thanks
#5
Slowest Progress Ever
![](/mt2011/images_td/ranks/supporter1.gif)
iTrader: (26)
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 6,028
Total Cats: 304
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
How come everybody thinks they need a T3 to make power? I've seen good power on a GT2560 such as 244 rwhp at 11psi with a hydra, and Paul is running 14psi? at puts over 300hp to the wheels with a MS! Correct me if I'm wrong but the GT2560 is a .64 turbine, .60 compressor. I haven't experienced this, but I believe that the GT2560 would probably be the best all around turbo you can buy for a street driven Miata. It should spool a lot faster than a T3 and as I listed above, you should make good power. I thought my SR20 T25 on 7psi made my Miata feel like a different car, and it probably didn't even have 200 whp...so I can't imagine a GT2560 with 14psi at 300 whp. That's F'n insane!
#6
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
How come everybody thinks they need a T3 to make power? I've seen good power on a GT2560 such as 244 rwhp at 11psi with a hydra, and Paul is running 14psi? at puts over 300hp to the wheels with a MS! Correct me if I'm wrong but the GT2560 is a .64 turbine, .60 compressor. I haven't experienced this, but I believe that the GT2560 would probably be the best all around turbo you can buy for a street driven Miata. It should spool a lot faster than a T3 and as I listed above, you should make good power. I thought my SR20 T25 on 7psi made my Miata feel like a different car, and it probably didn't even have 200 whp...so I can't imagine a GT2560 with 14psi at 300 whp. That's F'n insane!
#17
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
If you have the same compressor and a hotside with a smaller turbine wheel with a .63 and then a turbine with a bigger turbine wheel with a .63 turbine housing -the bigger wheel with spool slower..
That pic above looks like a pretty small turbo. It will likely do the whp you want, but it will take more boost. The TQ and spool will be sick though..
#18
Boost Czar
![](/mt2011/images_td/ranks/supporter1.gif)
![](/mt2011/images_td/ranks/admin.png)
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,688
Total Cats: 4,113
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
![Does Not Equal](https://www.miataturbo.net/images/smilies/notequal.gif)
They are cheap as hell, have a more efficient turbine and are easily rebuildable & upgradeable.
a T3 .48 is equivalent to a T25 .64
How the **** can you tell what the wheel trim looks like without even seeing the wheel? The only thing the trim refers to is the exducer^2 / inducer ^2
All T3s have a 60mm compressor wheel. the trim dictates the size of the inducers and ultimately to power output level of the turbo.
a .50 trim T3 is good for around 30 lb/min or around 290BHP - that's a good 230rwhp.