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Old 07-09-2011, 03:33 AM   #21
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I believe everyone drill and tapping their 8mm manifolds for 10mm have to drill out the turbo as well.
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Old 07-09-2011, 04:11 AM   #22
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Correct.
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Old 07-11-2011, 02:47 PM   #23
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Quote:
Originally Posted by wittyworks View Post
Has anyone used any 8mm inconel studs with success? The holes for
The efr 6258 are not big enough to fit 10mm studs, and borg Warner suggests 8mm.

So I finally got in contact with someone from BW that could answer this questions. Here is the response.

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Originally Posted by Kurt Henderson
Hello Lars,



Mr. Winkler asked if I was able to help with your question regarding the flange hole size for the EFR units…

If you are looking to fit one of the B1 (EFR-6258 or 6758) models to the Miata, you are correct; the flange holes are drilled to Ø9mm to accept M8 studs. If you choose to drill the holes out to accept M10 studs and nuts, I only see one area where that might be an issue: There is one flange bolt hole directly under the internal wastegate port passage on the 0.64 A/R TH that is tight even with M8 hardware and an M10 nut might not clear the casting opposite the flange. Otherwise, I don’t think there will be an issue fitting the M10 studs/nuts… maybe it’s possible to maintain that one stud as M8 to avoid to clearance issue? We’ve not had any trouble here with using high-quality SS M8 hardware that I know of so maybe it’s also worth a try to locate M8 hardware first.

Regardless, for performance use, we offer only a warranty against material or manufacturing defects as we’re not able to test and approve conditions for all applications. With this is mind, there’s no reason drilling these holes larger would void the warranty that I’m aware of. The only possibility of damaging the turbo by making this modification would be if you were to cut deeply into the casting for clearance, causing a thin-wall condition resulting in a crack and this would not be covered of course. Hope this helps, but let me know if you have any other questions.
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Old 07-11-2011, 07:30 PM   #24
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That is great news. I will probably get a trackspeed stud kit and test out the fitment on the exact efr he's talking about this week. The clearance on that one hole is pretty tight like he says, so I'll check out what needs to be done and if it's possible to fit m10 schtuff.
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Old 09-07-2011, 05:40 PM   #25
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Quote:
Originally Posted by wittyworks View Post
That is great news. I will probably get a trackspeed stud kit and test out the fitment on the exact efr he's talking about this week. The clearance on that one hole is pretty tight like he says, so I'll check out what needs to be done and if it's possible to fit m10 schtuff.
How did this turn out?

I was about to drill out my 6258 but realized it would take a bit of material removal on the turbine housing, or cutting one of my Begi 10mm nuts in half because it would be too tall.
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Old 09-07-2011, 05:58 PM   #26
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You do NOT want to take material off o the efr. I have the bolts fit now, and it's an extremely tight fit, but it works. I cut the stud down but I'm using a non inconel stud in that position for now, still need to cut down inco stud. Also, its gonna take some more work to fit the lock rings onto the hardware. Borg should have made all the turbos t3 flange and moved all the holes out
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Old 09-08-2011, 02:03 PM   #27
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Quote:
Originally Posted by wittyworks View Post
You do NOT want to take material off o the efr. I have the bolts fit now, and it's an extremely tight fit, but it works. I cut the stud down but I'm using a non inconel stud in that position for now, still need to cut down inco stud. Also, its gonna take some more work to fit the lock rings onto the hardware. Borg should have made all the turbos t3 flange and moved all the holes out
I wonder how easy it will be to cut down the Inconel studs. Also can you get pictures of it all?
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Old 09-08-2011, 03:21 PM   #28
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I think the stud will be easy to cut with an abrasive cut off wheel. It would probably eat up a bandsaw blade, but I'm not sure. I'll get pics as soon as I can.
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Old 09-09-2011, 01:02 PM   #29
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To answer the OP's original question I just installed the 8mm FM studs and they could stand to be 1/4" longer. I paid extra for them with the FM11 kit I just bought. When they are installed tight into the manifold they are not long enough to have the crimped part of the threads go over the stud. I installed anyway as I had a hoist reserved and didn't find this out until to late. I hope their one way lock washers work or I well probably have to remove and install longer studs or stage 8 nuts and locks.
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