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Old 07-08-2012, 11:36 PM   #1
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Default noob turbo questions , sr20 t25

Hey guys so I bought a turbo today its at Garrett t25 off of a sr20, wanting to make sure its a decent one for my turbobuild, it has very little shaft play. Thanks in advance for the input.
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Old 07-08-2012, 11:48 PM   #2
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Perfect turbo for your build.
Give us details on how much power you plan on making/ what fuel management you plan to use, etc...Do Not short change us. We need details.
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Old 07-09-2012, 12:02 AM   #3
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Perfect turbo for your build.
Give us details on how much power you plan on making/ what fuel management you plan to use, etc...Do Not short change us. We need details.
Oh sorry lol right now I'm running
the AEM fuel ignition controller with boomslang harness, also I have rx7 red top 460s ready to put in, running inovate LC1 wideband to keep an eye on a/f ratios. Was planing on going with artech manifold and downpipe. I really just wanna try for low to mid power range , but im trying to do everything better than a slap on low power build. Also I think this Turbo is water and oil cooled? Idk.
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Old 07-09-2012, 12:03 AM   #4
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Yup that's a great turbo, as evidenced by my sig.

It tops out around 200-225hp, depending on tune, boost levels, engine health, etc. But, on our little cars that's around double the stock power and plenty to work with.

You also avoid blowing up differentials, transmissions, and engines at that power level.

And yes it's both water and oil cooled.
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Old 07-09-2012, 12:19 AM   #5
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Mine made 225whp on around 12 psi. I think the highest any member ever made with one was 240? I have a 1.8 with a 99 head though...
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Old 07-09-2012, 10:13 AM   #6
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so can someone post up some build pics i just want to see what i need to be looking at with clearance issues and also how you ran the coolant and oil lines mine also is a 1.8 but i'm sure the 1.6 is the same block pretty much.
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Old 07-09-2012, 10:47 AM   #7
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Here's mine, but it's a scratch DIY build with an SR20 T25 including the manifold.

https://www.miataturbo.net/diy-turbo...-thread-28412/
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Old 07-11-2012, 05:30 AM   #8
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200hp on a 1.8. Sounds like exactly what I want to start with.
These go cheap in the 240/drift community.

Going to read Stein's build now, I plan on building my own turbo mani and dp.
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Old 07-11-2012, 05:32 AM   #9
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See my build thread in the....build thread section.
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Old 07-11-2012, 12:23 PM   #10
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For that turbo and that power level, spending the money on Artech stuff or welding yourself really isn't (time or money) well spent. Get yourself a used Begi cast manifold and downpipe for your hotside, and buy a universal CXRacing 2.5" IC kit for the coldside. There are 20 ways to route your IC pipes, but a simple "around-the-radiator" is just a matter of cutting the pipes to fit.

I see that you've got an NB... what year is it? HINT: Fill in your signature!!!

With a 2.5" or bigger exhaust on a 1.8, you should start seeing spool well under 2k rpm, and be fully spooled well under 4k. You should see in the 210-220whp range anywhere from 12-15psi, and peak torque somewhere in the 180-200wtq area.
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Old 07-15-2012, 07:24 PM   #11
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so Im pretty sure im going to have to re-clock this thing any info on how to do this or how to make the wastegate function with the inlet on the complete other side?
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Old 07-15-2012, 09:52 PM   #12
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You'll have to make your own wastegate bracket.

My personal favorite:



made out of 1/4" square tubing from Home Depot.

ANYTHING flat will bend. Remember that.
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Old 07-16-2012, 12:34 AM   #13
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I'll be getting the flying miata setup diy. It's the manifold dp elbow and lower dp for 750 plus shipping
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Old 07-16-2012, 08:37 AM   #14
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Quote:
Originally Posted by atli126 View Post
I'll be getting the flying miata setup diy. It's the manifold dp elbow and lower dp for 750 plus shipping
You may wanna pm Abe "artech" and get him to quote you mani and dp, he'll probably be close to that price and his work is beautiful from what I've seen in all the pics.
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Old 07-16-2012, 08:40 AM   #15
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Quote:
Originally Posted by curly View Post
You'll have to make your own wastegate bracket.

My personal favorite:



made out of 1/4" square tubing from Home Depot.

ANYTHING flat will bend. Remember that.
Awesome do you have a pic of the backside of the wastgate, and how did you go about clocking it?
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Old 07-16-2012, 09:29 AM   #16
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Clocking what, the turbo? Once you take the huge C-ring off, the compressor will rotate with a little BFH motivation, don't damage your compressor wheel though.

I should have explained more, that's an exhaust clamp around the stock st20 wastegate, I drilled the bracket off in a drill press. Just drill out the spot welds. Once mounted the wastegate can spin 360*, as can the actuator rod, supposedly without damaging the internals.

Last edited by curly; 07-16-2012 at 09:49 AM.
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Old 07-16-2012, 09:34 AM   #17
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Quote:
Originally Posted by curly View Post
Clocking what, the turbo? Once you take the huge C-ring off, the compressor will rotate with a little BFH motivation, don't damage your compressor wheel though.

I should have explained more, that's an exhaust clamp around the stock st20 wastegate, I drilled the bracket off in a drill press. Just drill out the spot welds.
Haha i see the exhaust clamp now that's awesome, how is the tubing attached to the turbo?
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Old 07-16-2012, 10:13 AM   #18
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Just a hole and a slightly larger Allen bolt through the inlet adapter, you can see the Allen head in the pic. Gotta be an Allen to make room for the coupler.
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Old 07-20-2012, 08:51 AM   #19
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cxracing 2.5 Intercooler kit ordered
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Old 08-08-2012, 10:11 AM   #20
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Can any of the guys who have the sr20 setup give me an estimate on how many feet of oil & coolant hose i'm probably going to need and also what size of each?
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