I'm somewhat stunned you don't have 10 takers yet.

I think I'm at 9. I'll be kind and extend the GB a day or two, but if you are on the fence, my suggestion is that you get off of it quickly. :party:

Sent in an email this morning.

i'd be in if it weren't for the fact that I won't have a built motor in time. I can't see the point in buying a manifold just to put it in a box on a shelf for six months to a year. By all means if you need buyers to make the initial cost of making the part economical i'm in, but i'd hate to steal a spot away from someone who will actually use it sometime soon.

Last year exactly this time I would have hit the pay button within 2 minutes of your initial post.

If this looks and performs as well as it should, it's gonna be amazing.

I thought about that part too, but here's the thing: EFR 6758 is a $1600-1700 turbo to purchase on its own. Any EFR manifold (FAB9, ARTECH, ETC) is probably $500-800. When someone says $1900 + shipping for a turbo and a manifold, for parts you were probably already going to buy, you take that deal. Right now, it looks like I spend $1600 on a turbo, and $350 on a manifold.

Plus I'm 85% on motor parts already. I think I'm looking for supporting parts at this point.

I am in. Assuming that my 6758 swaps into the t2 housing for the 6258 I should be able to do some back to back tests eventually.

err did the price on EFRs go up? I paid $1460 shipped for mine and it was literally the last 6758 available in the entire world when I bought it. It came from some audi shop.

The 6258 and 6758 are B1 frame EFRs, they should be identical externally unless I'm grossly mistaken. You should be able to swap "supercores" into the turbine housings between the two. If for some reason I decide the 6258 isn't enough for me, I'm just going to buy a $1200 6758 supercore and upgrayedd.

The price seems to have jumped up $200-$300 when they went to the aluminum CHRA on the second generation B1 EFRs. I don't have facts to back it up, its just something I noticed after the announcement.

Oh yeah, the aluminum chara price jumped but at least like 6 months ago you could still get the iron chara at the old price and the aluminum was just an option. I'm considering swaping to the aluminum chara to save more nose weight.

I was using the retail prices from Fab9, treadstone, FullRace, etc.

Aluminum CHRAs are an option on the Supercore, but you can't buy a complete turbo in the 6258/6758 with the 0.64a/r T25 turbine with an aluminum CHRA (if you can, I have yet to come across the part number). You can buy a Supercore along with four or five other part numbers (turbine housing, WG actuator/bracket, hardware kit, etc) and build a complete turbo, but the final bill ends up about $200 higher for the aluminum CHRA.

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Their 2015 catalog shows both, with separate part numbers. You can get complete turbos with aluminum housings if you are buying a T4 twin-scroll housing bundled with it, but not if you want the normal 0.64a/r T25 housing. I'll call tomorrow to try and get some more details on exactly what can be obtained from them.

BW says that aluminum is an option, but iron will remain the standard CHRA. If you want an aluminum turbo, email me and I will calculate the price (assume ~$200 extra).

The turbos also ship with medium boost actuators, which is fine for built motors, but stock motor guys will likely need the low-boost to keep things safe. I'll be in touch with all the GB participants to determine which actuator they want.

This question hasn't been asked yet, but it will be: Turbine housing finish quality. The investment cast housings that have been available for these turbos are not being produced any further. All of the B1 "A" housings are going to be produced in the shell-mold finish. There are some investment housings still in Borg's inventory, as well as in their distributor's inventory, but there is no way to tell what turbo has what style of housing unless you physically open each box and check.

For the GB, some of you will get shell mold and some of you will get investment cast. Nobody will get sand cast housings. I can't guarantee who gets what. Eventually, every turbo shipped will come with the shell mold housing.

I personally think the shell mold quality is perfectly adequate, and since our manifolds are shell mold cast as well, the finish between the shell mold turbine and the shell mold manifold will be very similar.

Here are the two options together:

Attachment 237715

Shell mold close-up:
Attachment 237716

Investment close-up:
Attachment 237717

Any performance difference?

That would be from the surface finish of the internal passages.

Is there a difference there?

I'm not mad at that shell mold finish at all. If you wanted to, I guess you could clean up the turbine housing on your own, and then get it coated to make it pretty. But it shouldn't matter unless you're jeffbucc. :bowrofl:

I hope the inside is nice and smooth.

Borg says the difference is within standard production tolerances (less than 1%), even for the sand cast housing. There are some internal parting lines on the shell mold housing, but it's nothing substantial.