Measured my China 2860 (Now with Datalog)
 

What does it all mean?

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Datalog and screen shot. Still needs some tuning and I'll probably be getting to the dyno this coming weekend (Jared?)
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It means you need to install that bitch on the car, show us some dyno numbers, and then start packing on the miles so we can get a reliability report out of you.

It's on. Soon as I finish the m-tuned brake sawp I'll be taking it for a drive.
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Going by wheel size its closest to this
TurboByGarrett.com - Catalog

+1000000000

which means it's a smokin deal except for the bearing is journal right?

looks good. well see how it performs. with all these people switching over to chinachargers, through trial and error we might just find a company out there that makes decent quality ones......this is promising:)

Seeing one apart makes me even more sure of going Chinese built. Only thing that makes me slightly uncomfortable is the fact I see no visible marks from balancing, if they in fact did balance anything. Maybe their engineering is that precise...

Or is that signs of balancing on the compressor wheel nut, or edge of the wheel, can't tell.

Yes, journal wet float. What ever that means.
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yeah i dont see any signs of balancing...

generally its done on the "nut" of the turbine end

all the same. a small brass sleeve with holes in for oil to pass through.






I do love how the measurements don't even come close to the auction however :)

enjoy the T2871.

The lack of evidence that the rotating assembly was balanced concerns me.....I would send it out to a place that rebuilds turbos just to get the CHRA balanced.

The balancing on my stock sr20 t25s were done on the back side of the wheels... i believe the compressor side. One had a lot of balancing, the other just had one tiny tiny little machining. U might want to just mark the orientation, and take appart the CHRA to check for balancing, then re-install in the same orientation (assuming its balanced).

I would still think about getting it balanced as mentioned by others.

Balancing is overrated.

Crap, I was looking at the same one, but I don't know if I'd like the 2871 size. In to see the psi/rpm graph

how much did this cost you?

300

Sorry, lol. Fuel is ok, MLV and MS read leaner then the dash top AEM gauge does the richer it gets.

To be honest I really didn't notice a whole lot difference in spool. It looks like it spools slower on the log but it dosent feel a whole lot different. Needs more boost.

Oh, I wanted to ask. What injectors does Newbsauce run and what were his DC's at 17 psi. I'm already seeing 72% at 11 psi on my 550's and walbro 190.
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So any idea what the oil inlet size is? lol

I run 550s with a walboro 190, and I see 77% DC at 15 or 17psi (i forget which one.) Laptop's in the car. Im just too lazy to go get it.

Whatever a T25 call's for. I can't remember exact but it's the same as my GT2554 was. Everything swapped right over.
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I bet it's because of the torque output, Brad's spools much slow than mine, but he has the same torque output below 4k...

Attachment 207091


his max DC% logged that day was 73.3%

What injectors/fuel pump?
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Good stuff!!! Now go drive a few thousand miles and report back :)

I'll rack them miles up b4 you know it. 50 a day.
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walbro 190HP, 550cc rx7 injectors, stock FPR & rail

So how does this feel in comparison to the GT2554? I'm really interested in changing to this if it works out well. Need more power!

Yo Phil, at what RPM do you get boost onset?


Its a smokin deal in any case.

I'm happy so far. Will let know once I'm running more boost.
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It's actually pretty responsive. Hits 5psi really quick. When I'm able to drive it in light traffic I'll get a better feel for it.
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This turbo is oil and water cooled right? What about oil pressure TO the turbo, r u using a restrictor?

No I'm not, but I think I should be. Thanks for reminding me.


What works well for restricting the oil feed?
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The reason I mentioned is because my previous experience with chinachargers indicates that they will blow the oil seals and start smoking oil if they are not properly restricted,since the engine oil pressure is higher that what they can take. look for an oil restrictor on Ebay.

Roger

is it smoking?

the ATP oil feed inlet w/tiny hole thingamabob.

-4 size Oil inlet fitting for GT28/30/35R with built-in restrictor: atpturbo.com

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.


Yeah, I went to the DIY FAQ and saw that.

Are there any DIY solutions? If not I'm going to stop at Murray's speed and custom on the way home. I'm sure they have something.
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a 1/8" pop rivet. search under sam navy's posts.

are you using a -4 or -3 feed line?

Honestly can't remember and I'm good enough to know by just looking.
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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?

You shouldn't need a restrictor if its -3.

Wtf?

The GT turbos are internally restricted.

the rear oil seal is just a piston ring. if it's not smoking now, it's not over oiled.

Donno if this helps or not.
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GT ones are, who knows how this thing was built.
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Good to know, would I hurt anything putting in a restrictor for piece of mind?
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i would think that as long as its getting enough oil you should be fine

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.

restrict it. I blew seals on 2 turbos back in the day on a journal bearing piece.

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.

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.

Off topic, curious as to how much you shimmed it. I shimmed mine as well, but haven't gotten to the "testing" part yet. :)

The super 60 and t3t04e I killed took a few months to start blowing smoke from blowing the seals.

and was that the only thing wrong with those turbos?

I would throw a rivet restrictor in. Looks like 4an to me as well.

Too much oil pressure on a journal bearing can cause the spool to decrease from increased friction.

yep...according to the shop who built the 2nd one. (thanks for telling me after the first one, asshole)

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.