Yes, some people are going with Nissan inconel m8 there, too. There is a thread from the last few days talking about it around here.

I went with an outlet V-band adapter to keep from continuing to mess with the studs. I had it professionally welded to the turbine housing and it has been awesome.

 

So glad this thread got bumped so I could read the most erotic thing Corky has ever written

 

Ok, I'm putting my flame suit on now & double posting. We bought a set of the Nissan 14064-40P01 studs to evaluate them. They don't look like Inconel, and they don't cost like Inconel. So, I called up my Nissan rep & asked him to contact Nissan Technical for me to find out what these studs are made of. According to Nissan Technical:

"The engineering drawing identifies this stud to be made of “AISI 660” with “bonderizing” surface treatment, which is an anti-corrosion phosphate coating. So, not Inconel, but corrosion resistant."

There you have it. If you'd like to compare this to our FM Inconel 718 hardware, ours has a minimum strength of 220 ksi. If you look up Inconel 718 it’ll tell you 180, but ours are heat treated twice.

 

And it looks like 660 ranges from 98ksi to 190ksi tensile strength dependent on processing. This does seem like a correct material to use for this application. Its still the best budget choice and is going to be superior to normal stainless or mild steel studs. If these are not enough for you, then you might as well go all the way to 10mm inconel studs.

 

Someone call Mazda technical and find out exactly what "inconel" grade they're using!

 

For the RX7 studs?

 

Hai hai