Is my new turbo too big?
 

I used to have a really small Garrett t25 from a 300zx on my 1.8 motor. Decided I wanted more top end, and since I am an OBX dealer, that I would test their turbo's to see if I could sell them. Well of course, being OBX, they're hard to deal with (I don't think they speak english), and there are no specs for their turbo's. Anyways, I ordered the GT28R with t25 housing, and just got it today.... And I'm not sure if it's just because my turbo was so small before, but this thing is freaking massive. The turbine side is 64, and the compressor side is .70 AR... it's a ball bearing turbo... when the hell is this thing going to spool?

http://www.dbmiata.com/miata/turbo/DSC00224.JPG
http://www.dbmiata.com/miata/turbo/DSC00225.JPG
http://www.dbmiata.com/miata/turbo/DSC00226.JPG

What are the sizes of the compressor and turbine?

And out of curiosity what did it cost?

I found your problem. Measure the wheels.

take it apart, measure everything, post measurements.
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internal wastegate fail.

1. I don't believe in "too big"

2. How didn't I know you were an OBX dealer? Got any of the Honda B18 Skunk2 intake manifold knock-offs?

3. You can get an idea by the measurements...but actual compressor efficiency will play a big role. Since they obviously don't test them (or provide compressor flow maps), you're stuck doing real world application-based testing.

In for datalogs of 2000-4000rpm spool in 4th.

its just a big housing...I like that compressor housing. It's also really easy to unbolt and measure that compressor wheel dawg.

it will spool by 4000.

http://gallery.y8s.com/d/455-3/gt25_86ar_08.jpg

similar to this maybe?

It's an OBX R so that should be good for lowering spool by 500RPM.:giggle:

Heck, you have it, might as well slap it on and give it a go. Then we will KNOW when it will spool.

I have a GT28R as well. I hit full boost at 3500 RPM (2.0l Stroker)

I'm not picking on you but actually want to know more about your car/motor. Go post a noob thread in the Meet and Greet section with some specs and photos of your car.

round hurr we call that a gt2560. Hi mike!!!

I'm pretty sure it's just a big housing on a small 60mm compressor wheel.

You're an OBX dealer? I think you're giving me reason to go to the island if/when I have money.

Please see Noob Post #2

Hey Hey Trey Trey ;-)

OK OK I'll take it off apart and measure it :) I can't slap it on the car as I'm waiting for my new flyin miata DIY manifold / downpipe to arrive (they're 2-3 weeks backordered).

this looks like the turbo on their site, and liek you said no specs, lol

Product Name - OBX Racing Sports

Yup that's it :) I have a 2006 turbo product catalogue from them with full specs, but they've changed everything since.

It cost $550, and at this point I'm quite impressed by it... it's even water cooled, which I really wasn't expecting.