DIY Turbo Discussion greddy on a 1.8? homebrew kit?
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Is my new turbo too big?

 
Old 01-22-2010, 02:51 PM
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Default 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?



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Old 01-22-2010, 02:56 PM
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What are the sizes of the compressor and turbine?

And out of curiosity what did it cost?
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Old 01-22-2010, 03:03 PM
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Originally Posted by dustinb View Post
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.
I found your problem. Measure the wheels.
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Old 01-22-2010, 03:05 PM
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take it apart, measure everything, post measurements.
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Old 01-22-2010, 03:08 PM
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internal wastegate fail.
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Old 01-22-2010, 03:13 PM
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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.
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Old 01-22-2010, 03:15 PM
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its just a big housing...I like that compressor housing. It's also really easy to unbolt and measure that compressor wheel dawg.
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Old 01-22-2010, 03:16 PM
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it will spool by 4000.



similar to this maybe?
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Old 01-22-2010, 03:22 PM
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It's an OBX R so that should be good for lowering spool by 500RPM.

Heck, you have it, might as well slap it on and give it a go. Then we will KNOW when it will spool.
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Old 01-22-2010, 03:25 PM
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I have a GT28R as well. I hit full boost at 3500 RPM (2.0l Stroker)
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Old 01-22-2010, 03:28 PM
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Originally Posted by miatamike View Post
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.
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Old 01-22-2010, 03:37 PM
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Originally Posted by miatamike View Post
I have a GT28R as well. I hit full boost at 3500 RPM (2.0l Stroker)
round hurr we call that a gt2560. Hi mike!!!
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Old 01-22-2010, 03:39 PM
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I'm pretty sure it's just a big housing on a small 60mm compressor wheel.
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Old 01-22-2010, 03:39 PM
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You're an OBX dealer? I think you're giving me reason to go to the island if/when I have money.
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Old 01-22-2010, 04:09 PM
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Originally Posted by Stein View Post
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.
Please see Noob Post #2
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Old 01-22-2010, 04:11 PM
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Originally Posted by hustler View Post
round hurr we call that a gt2560. Hi mike!!!
Hey Hey Trey Trey ;-)
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Old 01-22-2010, 04:38 PM
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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).
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Old 01-22-2010, 04:43 PM
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this looks like the turbo on their site, and liek you said no specs, lol

Product Name - OBX Racing Sports
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Old 01-22-2010, 04:44 PM
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Originally Posted by Full_Tilt_Boogie View Post
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.
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Old 01-22-2010, 04:46 PM
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Originally Posted by sixshooter View Post
What are the sizes of the compressor and turbine?

And out of curiosity what did it cost?
It cost $550, and at this point I'm quite impressed by it... it's even water cooled, which I really wasn't expecting.
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