I just wanna go fast.

If you can't go fast with 90hp you can't go fast with 900hp.
-Bwob

You never had me, you never had your car.

-Morgan Freeman

Sub'd

You do know you can do that with the "thread tools" dropdown menu at the top of the page, right? Not a big deal on this fast moving thread, but some others you might not want to bump when subscribing.

Facebook has ruined me, I've lost my forum ninja skills.

Yay! My sand cast makes me a special and unique snowflake! :facepalm:

Are you finding that the shell mold housings have better clearances around the bolt holes? Thank god BW discontinued the sand cast, its an insult to the rest of the turbo. The shitshow that I went through to get proper stud and nut clearance on my sand cast housing was ridiculous. I'm still not sure I trust my handmade clearance cuts and I've considered picking up another housing several times, but only if the clearances are better.

I have a sand cast housing here too, and the clearance between that and the shell mold housing looks pretty similar, although that's without actually bolting it up. I can get you a shell mold housing easily - the BW rep said that the completed turbos in their inventory have a mix of investment and shell mold, but the bare housings should all be shell mold by this point.

If I find myself in Sunnyvale during business hours I'll try to remember to bring mine over so we can rub our housings together. :party:

you had to do special clearance stuff? My sand cast worked as delivered except that I had to put one stud in with the short side facing the turbo and I have to make sure that I start threading that nut on first while the turbo is not pressed against the flange.

Yes, there was a huge mismatched seam that ran right through the area that was supposed to be clearance for the nut. I couldn't even fit the nut in that space until I carved out a shitload of that cast stainless. I'm still not happy with the clearance, but at least now the turbo is bolted to the manifold. There are also mismatches inside the housing and there were 1/16" tall razor sharp "spikes" all over the walls just inside the inlet just past the flange. I managed to remove a bunch of them a tungsten bit in my Dremel, but I don't have enough throw to get all of them. There are pics buried somewhere in my build thread.

The last of the invoices have been sent off. The deadline for the GB is tomorrow at 1pm PST.

I have now officially paid. Looking forward to some TSE goodness sometime in the future.

Just waiting on one. Paging @boileralum...

I'm pretty excited. Just by seeing where the turbo sits right now, do you think the FM heat shield over the downpipe/turbine would fit there still? Looks like it just moves the turbo forward.

I have no idea. Understandably, we have no plans to test our competitors' components for fitment with our kit. :)

They say you should call a doctor for erections lasting more than 4 hours. What happens if I stay rock hard until delivery of the kit? :jerkit:

You'll never roll out of bed in "yer" sleep!

(They say you should call a doctor for erections lasting more than 4 hours. What happens if I stay rock hard until delivery of the kit? )

Enjoy being a "junior" while you still can.

corky

:laugh: epic

Pre-order turbos shipped out today.

Looking forward to getting mine next week. Will make an awesome paper weight next to my vband 6758.

Should have mine on Tuesday, pretty excited.

So is mine, unfortunately it is coming to work so someone could sign for it and I am out that day. So I will have to wait till Wednesday to get the greatness that is the EFR. It will proudly be displayed on my desk during the day.

Did you keep one for yourself to test?

I have a 6258 and a 6758 for evaluation here.

Just unboxed mine. Looks nice. Got the 6258 with aluminum center section. Only thing that seems odd is the oil return looks like the machined flat spot for the flange is machined down to the point that there are basically no threads on one side and maybe 2 on the other if you used a 3/8 npt fitting which I thought you were supposed to be able to do (ie flange or fitting). Way it is, it looks like I'll need a bolt on flange w/gasket instead of just a threaded fitting or I'm afraid it will weep oil. Anyone else's look like that?

Been on here for several years but this is my first post!! Pretty excited to get going on this EFR install this winter.

On my old iron housing there is hardly any NPT threads as well. It seals with liquid teflon sealant. If I had the room I would prefer to use a flanged connection on this thing.

Well that makes me feel better. Wasn't sure if I should try and ask Borg Warner about it. Once we get our manifolds have to see if there is room for a flange. Noticed Treadstone and others list several different style flange fittings for the EFR's.

Hoping to hear about a group buy for down pipes!!! I'd vote for V-band lower clamp also but I guess you could always cut the normal style flange off and weld on whatever you wanted. Either that or maybe a "no lower flange" option.

I like the sound of having a v-band lower clamp as well. If you are going to have an exhaust made, you might as well go full v-band.

I too will be interested in a group buy for the down pipes, if there is going to be one.

I'm going to be prototyping the downpipe next week. I should be able to offer an option to bolt up to a 94-97 or 99-05 flange locations, as well as an option for a straight 3" dump for those who are building custom 3" systems.

Definitely in when you get a down pipe available. I think a V-band option would go over well. Hopefully the first group buy people get a shot at fist dibs. Like stoves said, if your going to have an exhaust built I'd go V band if its all the same.

<p></p><p>&nbsp;</p><p>What does the response of a 500whp EFR7064 even look like? I can't imagine putting that much power down unless your just a dyno Queen typo of car builder. To me the 300whp figure is perfect.&nbsp;</p><p>&nbsp;</p><p>EDIT: sorry thought that was the most current post but relized I was a page or two back.&nbsp;</p>

Plans for the 7064 kit were scrapped years ago. The EFR7163 will do 500whp and will bolt up to our manifold, but I have yet to come across an individual foolish enough to try it :) For the vast majority of people (80%), the 6258 is perfect, and for 19 out of the other 20%, the EFR6758 is perfect.

I thought I'd regret not stepping it up to the 6758...nope, I don't even want to think about having a larger turbo than the 6258. 356 hp with a conservative tune....I tip my hat to those that go bigger. I wouldn't have the balls to drive it with much more power than its current state.

I just got my efr 6758 in the mail today. Wow is it awesome. Did I somehow get an investment cast housing? The finish on it is unbelievable. I looked at the shell mild pics a few pages back, but those look really rough in comparison.
https://www.miataturbo.net/attachmen...ine=1436312792

They are still sending out a blend of investment and shell mold housings.

The EFR is making a nice paper weight on my desk today. This thing is huge, especially compared to my v-band one. I will get some comparison pics tonight.


https://www.miataturbo.net/attachmen...ine=1436358965


https://www.miataturbo.net/attachmen...ine=1436358965

I'm voting vband on as many connections as possible too!

Lars, did you go with a 62 or 6758? Even the birds of your wallpaper can't help but appreciate the glory sitting before them.

Stoves, team 6758 represent! These things are a mechanical work of art IMO. I'm itching to put it all together. That polished t25 flange is some seriously sexy stuff. And these turbos are LIGHT compared to my 2560, it was surprising just how much of a difference it really came out to.

I'll be in for a downpipe as well, though I'll have to modify it for a slip-on fitting. I know you mentioned it already Sav but I'm definitely going to order some FM-style solid water lines if you end up fabbing them.

I went with the 6258, I already have a 6758 v-band sitting in my garage.

My eventual plan is to end up with a decent SSM miata. It's going to take me a long time though. I think next year will be street prepared. After handling the turbo, I wiped down all the machined flanges with light oil, covered them in a bunch of layers of painters tape and put it away. I ordered one of the treadstone flanged -an adapters and -an caps for the oil inlet and outlet. I guess I'll just fill the turbo with oil, and seal it up for awhile. I'll probably plug the water fittings too.

I'm pretty sure my jaw was on the floor the whole time I was checking out the turbo yesterday. I'm debating whether or not I want to pull the turbine housing and send it to swaintech for coating. I'll probably just wait for the manifold and dp to send too.

EFR 6258 on the left, EFR 6758 in the center, GT2871 on the right.
https://www.miataturbo.net/attachmen...ine=1436447972
https://www.miataturbo.net/attachmen...ine=1436447972

that 2871 is way, way bigger than my 2871.

Lars has the 56trim 2871.

I've sold 3071's with tial's compact compressor cover that were physically quite tiny.

https://www.miataturbo.net/attachmen...ine=1436473631

Mine's not a Tial cover, but it's tiny, 2871R:


https://www.miataturbo.net/attachmen...ine=1436478780

Anyway. /threadjack

A thing arrived today.

Attachment 237593

Attachment 237594

More in a couple of weeks when it sees track time. Come see it at MRLS in October too. :)

<p><br />Can I have some alone time with it at MRLS?</p><p><img src="http://cimg8.ibsrv.net/gimg/www.miataturbo.net-vbulletin/500x281/80-zch2awwh_da311df474dd6b283ad3a415ffe3a38bd02ff79f. jpg" title="" /><br />&nbsp;</p>

Wowwwww. That thing looks so awesome.

How long until we start to see some mock ups for downpipes?

I'm really liking that mani.
Good job

^ What he said. I feel pretty happy to be a part of the initial group buy with a nice piece like that coming down the line.

It looks sexy. Are those your new M8 inconel studs? Will they be the same price as the old M10 ones. Just trying to plan how much more money I have to have ready to send to you.

Slightly better shots:
Attachment 237591

Attachment 237592

Those are M8 studs, yes. Not production, just some protos I have laying around. Production studs will be a little different dimensionally. Pricing will be similar to the M10 stuff.

More on downpipes next week.

Just wondering, are the walls thick enough to tap for individual egt probes (1/8npt)? Or, would you recommend welding on bungs? I love datalogging and have an Innovate TC-4 sitting around. If you think the holes will cause problems down the road, then I'll forget about it.

--Ferdi

Walls are ~8mm thick in most places. Plenty of meat to tap for 1/8npt probe fittings.

Hey Sav, any chance you might be able to test turbine backpressure when you start testing the manifold with any of the EFR options you'll be offering?

That really is a beautiful design.

I've been bemoaning for years the fact that nobody has ever designed a cast manifold for the Miata which approximates the internal geometry of a good-quality welded tubular manifold. Yours is the closest I've yet seen to that ideal.

Any good internal shots of the merge (looking straight in through the turbine flange)?

Thank you. That's what I was going for when it was initially designed - I wanted the performance of a welded tubular manifold and the reliability of a cast manifold, and this is pretty much exactly what I had in mind. To get something swoopier and more exotic than this requires moving to investment castings and multi-part tools, and the price goes up. If you want to stick to a simple two-part shell mold with four simple cores, this is about as good as it gets, IMO.

Not handy, but I do have something that you might like better. This is from the initial CAD, and the lines run along the center of each runner to show the blendpoint. I think the merge point worked out OK :party:

Attachment 237590

Downpipe prototype, so you guys can get an idea of the bend radiuses. 3" mandrel, all bends are 3" CLR. Production parts will likely be 16ga 304SS. There are no slipjoints in the prototype and it installs easily from the bottom, so we won't be forced to slipjoint it for installation. We will likely still do a slipjoint on the back for various stock exhaust options (94-97, 99-05, or 3" options).

Not a production part, but a representative prototype. Details may change (weld locations, bracing, slipjoints, etc).

Attachment 237574