My EFR Build Planning
 

Started with a 1991. Currently I have it VVT swapped driven by a MS3 PNP running all NB2 sensors and wiring, 725cc EV14 injectors, stock everything else. Basically, I have all the fueling and brain ready to go for forced induction. I've also got a 6 speed with uprated clutch and flywheel, and a 3.6 torsen type II diff. My target is 225-250 RWHP with good spool.

At this point, I believe I'm ready for FI. I just placed an order for the Kraken EFR manifold and full 3" exhaust with catalytic converter, and now I'm planning on ordering my EFR 6258 and cold-side. Specifically, I was looking at:
https://www.full-race.com/store/borg...fr-6258-turbo/ (supercore only with EFR V-Band)
https://www.ebay.com/itm/Genuine-Bor...d47f%7Ciid%3A1

That should give me a NIB EFR 6258 that matches what I need for the manifold for ~$1400 right? Are there any risks from purchasing it this way? These prices do significantly undercut other places I'm seeing.
Also, I was planning on building my cold side from either https://www.siliconeintakes.com/, or just bite the bullet and pay the $600 for the flyin miata intercooling and piping kit. The singular piece nature of the flyin miata piping is appealing, but I don't want to spend that much money.

Current questions/doubts:

• Is my EFR 6258 sourcing not suitable? Is buying the turbine housing separately a bad idea?
• Do I need an EFR speed sensor kit?
• Is the built-in EBC and BOV of the EFR 6258 acceptable?
• I know 2.5" post intercooler, 2" pre-intercooler is the easier route, but what pieces specifically work in an NA if I were to build my own intake?
• I've still got to figure out oil/water lines. I was planning on buying an oil filter sandwich plate, and using home-made AN lines which seems easy enough without any special tools. Is this sound?

I have a good bit of time since there's a backlog on the Kraken order, but I want to make sure I have the right plan and parts picked out before I continue.

https://www.miataturbo.net/diy-turbo...4/#post1536337

Or get the whole turbo for ~1250

Edit, As stated further down that thread, price may have crept a bit, but can't hurt to call?

I'm not really a fan of asking for "special pricing" or anything like that. If it's an advertised price, I'll buy it, but some person posting on forums to contact company ABC for a special discount is a bit too much for me. They'd have to at least be a company rep before I did that.

So you want to mickey mouse a turbo together, and likely not have a proper warranty on it because you pieced it together yourself, but calling up a vendor and asking for the already pre negotiated Miata Turbo special pricing is too low brow for you?

I was the person who setup the special EFR pricing for Miata turbo members when i got my turbo from them. and lots of others followed and purchased the turbos there.

Industrial Injection is a platinum BW dealer, BW corporate referred me to them when i called complaining that i cannot find any EFR turbos in stock anywhere.

If you dont want to make a phone call to save ~$ 200, Full-Race has the complete turbo for $1495. point click, buy. i think $120 is worth the piece of mind that you are getting a whole turbo with full warranty.

Industrial Injections price has gone up a ton. I talked to Gavin a few weeks ago and 6258 prices were $200 more then back in June.

Thanks, I'll make sure to buy it put together. I haven't done this before and assumed the warranty would be unaffected because doing the install may require you to adjust the housing to ensure proper alignment of the fluid pathways. At least, I thought it might. Since you say it's a big risk and I'd be "Mickey mousing" it if I did, I'll stick to buying the full unit.

I'm this case you need to have Gavin price match some one else, a member here had gavin price match jegs.com when they had this turbo for $1190 or so.
They will price match a valid website
Here is one for $1383. Still a good deal
https://thmotorsports.com/10526673-b...0aAr9XEALw_wcB


The super core will have a warranty, but if there's an issue, BW might ask where you bought the turbine housing, and when you say "ebay" they might say not authorized seller and deny warranty. You know how companies get with authorized dealers...

If you are dealing with Full Race, remember they have M8 and M10 inconel studs and hardware for sale for the hotside and they are reasonable.

To answer your other questions

You don't need speed sensor
Built in ebc and bov is fine. I'm using the turbo as it came with 17 psi and 309hp.
I got the medium spring iwg. Gives me 10-11 psi 250hp wastegate only, and 309hp at 17 psi.

Stock bov whistles a bit when cruising around not boosting, a bit annoying. BW sells a different spring to solve this.

My kraken kit came with oil and water lines, has he stopped including the lines?

I am well aware of the price matching. The point I was trying to make is that EFR pricing floats around a ton. We had a member here get a 6258 for about $1190, now Gavin can't do them for less then $1390. Jeggs itself pricing has gone up north of $1700 for a 6258, with a lead time of January last I looked.

$1390 is still the best price around. And gavin has them in stock, unlike every other website that quotes months of wait.

I still think that $1190 pricematch was an error on jegs website, they had the super core price with a full turbo part number.
I see they fixed it now and it's back to msrp of $1750 like it should be.

And in 2+ years, I have never seen jegs actually have anything bw in stock. Always a 2 month wait, then the clock resets again to another wait.

I bought the Kraken kit at the time I did because it looked like he dropped the pricing on it, but unfortunately it looks like he is no longer including the oil/water lines. Inconel studs with copper nuts are still included, but the EFR V-band clamp is not.

One item that's come up: how should I manage engine bay temps?

Should I get the manifold, turbo's turbine housing, and downpipe ceramic coated? I know that'll keep engine bay temps fine, but will that lead to premature wear/warping of the parts? I want to get a setup that will be fine for semi-daily usage for years.

If I wanted to DIY my own heat shield, is there a miata specific guide to follow?

pretty easy to fab up something simple. here are the parts I made. They are ..less simple. also willing to part with them, they dont fit my current system. turbo heat shield, and a big aluminum divider to keep hot air out of the intake, AMAP.

https://cimg2.ibsrv.net/gimg/www.mia...100d46635e.png
https://cimg3.ibsrv.net/gimg/www.mia...ed92e4a29d.png
https://cimg5.ibsrv.net/gimg/www.mia...ba5bd856d6.png

How does that mount? It looks like it's connected to both the turbine housing and the engine bay, but I thought under load those two points can move in relation to each other as the engine mounts can flex.

nothing mounts to the turbine. It bolts to the fender and the brake master cylinder. same with the cold air gaurd, all bolts to the fender in OEM bolt holes.

Awesome. I can make something like that (I think). Thanks.

You can buy the heat shield from FM it fits perfectly with kraken efr setup. I'm running it.

Awesome! It's only $100 and that would make things go much smoother. The less I have to worry about the details, the less likely I am to run into issues.