Subarus have like 2 ft long exhaust manfiolds.
I just want twin scroll, thats all.

Is the 6758 getting a v band inlet housing as well? Looks like treadstone has one listed (Borg Warner B1 6758F 0.85 a/r VOF WG V-Band Inlet Turbocharger) but full race doesn't.

I'm not sure the 58mm turbine really fits correctly into the 0.85AR housing.

If you upgrade Leonid, I may have to grab that EFR from you.

Turbine inlet? Yes, it just hasn't made it to resellers yet.

BW brought them to SEMA and PRI this year:

https://www.miataturbo.net/attachmen...ine=1387038558

https://www.miataturbo.net/attachmen...ine=1387038558

MotoIQ PRI Link

^that's what I'm holding out for. Vband inlet on the turbine. I'd like it on the smaller options...

The real question is it the same size v-band flange as the Tial housing for Garretts?

I am somewhat surprised of the Stainless turbine housing. Is this common? Seems like thermal expansion would be too high.

Not common yet. Iron is easier to cast than stainless, and cheaper, which is why most in the past have been iron. But stainless has poor thermal conductivity compared to steel or iron. That makes it a good choice for a turbine housing.

I agree the 6258 is small for a 2.5L engine... however "too small" is a relative term. Jager Racing STi (100% stock 2.5L) dominated Redline Time Attack this year, winning 1st place street class at every event with an off-the-shelf 6258 and stiff wg actuator (this made a lot of evo guys pay attention)

yimisport just installed that setup on an otherwise stock outback XT here: A Wolf in Sheep’s clothing | Yimi Sport Tuning awesome sleeper build


this will become an option in feb-march timeframe. We try not to put things online that arent currently shipping and dont have a definite date

available now on the 7163, and over the next few months it will become an option for the rest of the lineup

yes

stainless steel is the ideal material for a turbine housing. thermal expansion is not an issue whatsoever

What "indy engineers" told you that?? There have been >>zero<< indycar turbo failures over the last 3 years, this is something we take very seriously. The aluminum bearing housings work great when watercooled (this is mandatory -we tested this in the lab) I was with tony kanaan, he loved the new EFR7163 turbos. Dario Franchetti's guys loved them... Andretti's crew loves them. Buddy Lazzierre and his dad were blown away. Bobby Unser said its the most significant change in turbos since the 1970s... so yeah the guys we talk to have no complaints. would like to know who you speak with

Geoff, The T25 version of 7163 is dimensionally same as the rest of the B1 frame turbos, right?

mine might be longer than that...

I asked that a few months ago on NABISCO and he answer, yes.

correct, the 7163 is the largest and highest flowing rotor group possible to cram in the B1 frame turbo. All of these B1 frame turbos (6258, 6758, 7163) share identical outer dimensions and plumbing connections.

Aside from the rotor pairs, the only hardware differences are in the way of new turbine housing options. We have larger 0.85 A/R in T25 IWG, Vband-IWG and Vband-EWG, and there is a brand new twinscroll T4 0.80 a/r IWG.. these will all carry over to the other B1 turbos once 7163 supply stabilizes. That being said im really excited to try a twinscroll 7163 on everything i own (F150, SR20, evo, bmw..) its a very interesting turbo. once i can get my hands on one, the 8374 is coming off my evo and t4 0.80 7163 is going on, i plan to use every bit of the comp map!

Thanks Geoff for getting back about the V-band inlet size. I have a Tial V-band GT2871 and have no desire to change my manifold. Knowing that the V-Band EFR will clamp on makes me much more interested in giving it a try sometime in the future.

no problem - going from a 71mm gt2871 vband-ewg to a 71mm EFR vband-ewg would be a great comparison. the transient response of the EFR is unique and since the 2871 does not shine in this regards, I think would be worthy of consideration. as others have mentioned - dont underestimate the 6258 and 6758, those turbos absolutely rock for the 44lb/min->53lb/min airflow range

Do the housings swap between turbine sizes on the B1 frame? IE say you own a normal 6758 now and want to put the twin scroll turbine housing on it, then a year later decide you want more top end that the 6758. Can you just buy a 7163 super core and put it into the turbine housing you already have?

the housings are machined for each wheel. you can use the same housings for a 6258/6758 because they both use the same '58'mm turbine wheel. however the 7163 has a 63mm turbine wheel and requires the housing be machined to suit. this size bore would be way too big to use on a 58mm wheel

Two HPD Engineers that design the Honda Indy engines. I'm not going to post their names but I should clarify, they didn't say they had any "on-track" failures. They said they were worried about the durability of the aluminum housing, so the teams were changing the turbos out more often.

I didn't know you could get Vband inlet turbine housings for these!