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Old 03-08-2015, 11:31 PM   #41
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Originally Posted by ryansmoneypit View Post
Sooooo, Lloyd D was right, the whole time?
No, he said they were 12.9 heat treated steel.
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Old 03-08-2015, 11:58 PM   #42
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Oh yeah, forgot that part.
Nissan looks like my choice. Thanks for the part #'s guys.
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Old 03-10-2015, 12:51 PM   #43
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Obviously we're all aware of the issues with the manifold to turbine studs. Concerning the turbine to downpipe studs however, I'm not aware that anyone has issues with the standard A2 / 304 stainless studs we've always used. We sell a ton of kits & if it was a problem I likely would have heard about it long ago. Does anyone have pragmatic feedback on this, most likely with the track cars?

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Old 03-10-2015, 01:35 PM   #44
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Heat load at turbine to downpipe is MUCH less. Heck, I've even gotten away with mild steel for several thousand miles at that connection. Turbine does a heck of a job extracting the heat and turning it into mechanical energy.
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Old 03-10-2015, 02:16 PM   #45
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I had a few fail before going to a better arrangement (v-band).
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Old 03-10-2015, 04:16 PM   #46
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Edit-wrong thread lol
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Old 03-13-2015, 08:46 PM   #47
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We've done a little research into thermal expansion rates. Here's what we've found so far. It seems that our Inconel studs actually match the expansion rate of the cast iron best. If anyone wants to do their own research I'd be interested to hear what you find- here's a great resource.

The Garrett & ATP turbo housings we use are described as “High silicone ductile cast iron” which is a little vague, but none of the different versions on matweb.com have a thermal expansion ratio. We did find a spec elsewhere for D-5 (which is typically used for gas turbines) that gives a spec of 7.8 at 1400F.

Material Thermal expansion (microinch/(inchF)) at temp Tensile strength, ultimate
Cast iron, A536, 100-70-03 (our manifolds) 7.56 69.8F - 1650F 110 ksi
Cast Iron, A536, 120-90-02 7.61 69.8 - 1650F >= 120 ksi
Stainless Steel A2 / 304 (standard studs) 10.4 32 - 1200F 73.2 ksi
Inconel 718 7.2 68 - 212F 220 ksi
Inconel 718 alternate temp 8.9 1400F 220 ksi
AK Steel type 410 6.5 32 - 1200F 221.2 ksi
AISI 660 / A-286 10.8 69.8 - 1650F 174 ksi
Turbine (assuming high silicone ductile, type D-5) 7.8 1400F
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