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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 03-30-2009, 05:34 PM   #41
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In the honda world at least, 99% of turbos failed bc of wrong oil pressure to the shaft. Now, miatas are nicer that any honda, so lets keep our turbos spooling!!! Have I told everybody how nice miatas are?

Last edited by rogezeus2003; 03-30-2009 at 05:35 PM. Reason: MIssing percent
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Old 03-30-2009, 05:35 PM   #42
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You shouldn't need a restrictor if its -3.
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Old 03-30-2009, 05:36 PM   #43
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Originally Posted by rogezeus2003 View Post
In the honda world at least, 99% of turbos failed bc of wrong oil pressure to the shaft. Now, miatas are nicer that any honda, so lets keep our turbos spooling!!! Have I told everybody how nice miatas are?
Wtf?
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Old 03-30-2009, 05:38 PM   #44
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No and Id like to keep it that way lol. Im wondering if my 2554 died because of too much pressure. Before I took it off it smoked out the exhaust and oil collected in the compressor.
The GT turbos are internally restricted.
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Old 03-30-2009, 05:41 PM   #45
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the rear oil seal is just a piston ring. if it's not smoking now, it's not over oiled.
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Old 03-30-2009, 05:42 PM   #46
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Donno if this helps or not.
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Last edited by levnubhin; 03-12-2010 at 04:49 PM.
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Old 03-30-2009, 05:43 PM   #47
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The GT turbos are internally restricted.
GT ones are, who knows how this thing was built.
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Old 03-30-2009, 05:44 PM   #48
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the rear oil seal is just a piston ring. if it's not smoking now, it's not over oiled.

Good to know, would I hurt anything putting in a restrictor for piece of mind?
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Old 03-30-2009, 05:46 PM   #49
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i would think that as long as its getting enough oil you should be fine
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Old 03-30-2009, 05:51 PM   #50
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Really tough to tell, but that looks like -4. You can restrict with a pop rivet if you wanted to for piece of mind, wouldn't hurt.
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Old 03-30-2009, 07:14 PM   #51
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restrict it. I blew seals on 2 turbos back in the day on a journal bearing piece.
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Old 03-30-2009, 10:11 PM   #52
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Originally Posted by Braineack View Post
the rear oil seal is just a piston ring. if it's not smoking now, it's not over oiled.
the voice of reason. I have never seen a turbo just all of the sudden develop a leak for no reason other than something being out of wack. if it doesn't leak right a way, it ain't gunna unless something else is wrong. like a stuck seal from coking or a failed thrust bearing.
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Old 03-30-2009, 11:02 PM   #53
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Does it make since to put a restrictor in if you're not having a problem? Do you really think you can over oil the bearing(s)? I don't think so. I'm running -3 on a journal bearing t3 w/o issue. Have been now for at least 1,500 miles - half of that for no reason but to beat on it. Oh, and I've got a shimmed oil pump. I'm running near 100psi at 7k rpm.
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Old 03-30-2009, 11:29 PM   #54
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Oh, and I've got a shimmed oil pump. I'm running near 100psi at 7k rpm.
Off topic, curious as to how much you shimmed it. I shimmed mine as well, but haven't gotten to the "testing" part yet.
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Old 03-30-2009, 11:44 PM   #55
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The super 60 and t3t04e I killed took a few months to start blowing smoke from blowing the seals.
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Old 03-31-2009, 12:18 AM   #56
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and was that the only thing wrong with those turbos?
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Old 03-31-2009, 12:36 AM   #57
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I would throw a rivet restrictor in. Looks like 4an to me as well.
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Old 03-31-2009, 12:38 AM   #58
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Too much oil pressure on a journal bearing can cause the spool to decrease from increased friction.
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Old 03-31-2009, 12:43 AM   #59
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Quote:
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and was that the only thing wrong with those turbos?
yep...according to the shop who built the 2nd one. (thanks for telling me after the first one, *******)
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Old 04-06-2009, 05:37 PM   #60
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OK, I just got mine in today, and it has almost no similarity to yours. This was my ebay auction: eBay Motors: Drift T28 GT2860 S13 S14 Upgrade Turbo Charger .49 AR (item 110369223283 end time Mar-30-09 20:31:14 PDT) which is word for word the same as yours, but mine looks completely different. The big .42 A/R cast into the compressor makes me think they just randomly shipped whatever was close to them. I'll take some actual measurements when I get home, but methinks I got the shaft.
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