Turbo Elbow Hardware issues :(

[nissanfreak317]

Alright, I guess I have two questions at the moment. I am trying to put together my new turbo setup on my s14 sr. It's a GT2871R with Greddy elbow, I believe that the rest of my setup is irrelevant to my questions. I am wondering about the studs on the turbo that connect to the elbow, I'm missing some of the nuts and am contemplating replacing all the studs and nuts with new stainless steel ones. The old ones are carbon steel, as is the turbo housing and elbow. new elbow is stainless. Anyone see any issues with replacing this stuff? Frsport sells new carbon studs and copper nuts, but I would really rather go all stainless.

Second issue, I bought the elbow used off another member here and it is missing one of the studs that connects to the downpipe. I have confirmed that it is M10x1.25 thread. I cannot for the life of me find where I can buy stock stainless all-thread in this size. If anyone has a hookup I would really appreciate it. This is a Greddy elbow so I didn't think that finding replacements would be too hard but it's been tough.

Thanks

[nismoman]

why are you so set on stainless steel? the regular studs work great, and so do those copper nuts from frsport. they are locking nuts so you dont have to use those irritating lock plates.

i just think you are over complicating it, unless there is a reason you want stainless that i dont understand

[e1_griego]

Our ace hardware carries all the automotive studs in the correct metric size.

[godrifttoday]

I could source them ... Most likely .... Pm

[nissanfreak317]

why are you so set on stainless steel? the regular studs work great, and so do those copper nuts from frsport. they are locking nuts so you dont have to use those irritating lock plates.

i just think you are over complicating it, unless there is a reason you want stainless that i dont understand


You are mixing up my two questions. The hardware that connects the turbo and elbow together (as well as the turbo to manifold connection that you reference) is easy to source. I can get m8x1.25 in every shape and color available. I am considering going stainless because the heat from the exhaust speeds up oxidation and the carbon steel hardware rusts really badly. Also, I am considering that I would prefer to have the same thermal expansion coefficients for my hardware and parts. Which I guess would mean staying with carbon steel for turbo to manifold connection and switching to stainless for the turbo-elbow connection. It may be silly and anal, but it will be easy to do and as far as I can tell the benefits outweigh the risks.

My question is simply if anyone has done it and what their experiences were, and if anyone has the answer, why copper nuts?

In relation to my second question, the Greddy elbow is supposed to have 3 stainless studs on the other end for the downpipe connection, I only have 2. Finding replacements is difficult and I am looking for a source.



Our ace hardware carries all the automotive studs in the correct metric size.


Thanks for the reply, unfortunately I have checked with several specialty hardware carriers in the area and performed a rather extensive online search still turning up a blank.


I could source them ... Most likely .... Pm


Thx, I'll check it.

[zurud]

The exhaust stud on gt2871r is m8 x 1.25

[GSXRJJordan]

First off, the studs don't shear when everything's done correctly (locking tabs on the nuts), there's not nearly enough weight or vibration to stress a 8mm steel bolt. Stainless hardware expands and contracts similarly enough to carbon steel that you won't have any problems. If you want stainless studs, get them, but please use the OEM locking tabs (or safety wire) to secure the nuts to the studs.

Secondly, use a M10x1.25 bolt with loctite, installed from the bottom, in lieu of a 3rd stud on the downpipe. This is very common, and allows for easier downpipe to elbow assembly while on the car.

[nissanfreak317]

First off, the studs don't shear when everything's done correctly (locking tabs on the nuts), there's not nearly enough weight or vibration to stress a 8mm steel bolt. Stainless hardware expands and contracts similarly enough to carbon steel that you won't have any problems. If you want stainless studs, get them, but please use the OEM locking tabs (or safety wire) to secure the nuts to the studs.

Secondly, use a M10x1.25 bolt with loctite, installed from the bottom, in lieu of a 3rd stud on the downpipe. This is very common, and allows for easier downpipe to elbow assembly while on the car.


Thanks for the reply. I was never concerned about shearing anything and i will be using the locking tabs for the turbo to manifold connection. My main question was about the turbo to elbow connection hardware though. I just purchased lock nuts and stainless studs for that.

Looks like i could go for something like this for the elbow to dp connection. Thanks for the bolt idea.

ARP M10 x 1.25 x 25 hex SS bolts 763-1002 763-1002 BuyImportPerformance.com (http://www.buyimportperformance.com/ARP_M10_x_1_25_x_25_hex_SS_bolts_763_1002_p/763-1002.htm)

[GSXRJJordan]

Again, no need to reinvent the wheel ~ the housing that you're bolting into is cast iron, not stainless, so it doesn't make sense to go with hardened stainless bolts (unless you want to for some reason).

Also you might not be able to get an elbow on if you have studs on every hole, sometimes the aftermarket elbows don't have clearance for that. Use a M8x1.25 ~25mm bolt with loctite/lock washer if your stud doesn't fit.

[nissanfreak317]

The bolts I posted would be used for the Downpipe connection to the elbow. The Stainless steel Greddy elbow had three stainless steel studs and one is missing. So, I plan to replace the missing stainless steel hardware with new stainless steel hardware. I'm not reinventing anything about that except using bolts instead of studs.

I will look into the fitment of the elbow to the turbo housing. The turbo came with studs in the housing so I assumed it would fit fine but I haven't mocked it up yet.

In the case of the hardware for that connection, I planned to switch to stainless mostly because I don't like rusty hardware. If we were going to look at it from thermal expansion (which I know is basically negligible here) then it is ideal to have stainless hardware where there is a stainless flange. It has nothing to do with the turbo housing being cast iron.

The purpose of this thread was to find a source for m10x1.25 hardware. I had searched just about everywhere I could think of (Home Depot, Mcmaster Carr, Fastenal, my buddy who works at a machine shop, etc...) and found nothing that I could replace the missing SS stud on my elbow with. So, now we have the bolt idea for that, which is great, I found bolts.

My only remaining question is, what is so bad about using Stainless hardware? I already stated that I like it for the lack of rust and asked if anyone knew of a legitimate reason not to use it, aside from frsport.com not selling it. My turbo elbow came with stainless hardware, how bad could it be? The only thing I can think of other than a slight price difference is that Stainless on Stainless has a tendency to gall up sometimes, but I'm not sure if that will pose a problem for me. What am I missing? :goyou: