i would not recommend the EFR 9180 for a stock RB26 - this is wayyy too much turbocharger for the stock RB. The 76-70 would be a GREAT match for it, and if you did some headwork and cams the 8374 would be another excellent option. Additionally for the RB - i think the Twinscroll 0.92 a/r with internal WG would be the best option to go with (Thats what im using for my my car)

heres a pic of an R34 GTR RB26 w/ 8374 IWG


heres a pic of a different R34 GTR RB26 w/ twin 6258 turbos IWG:

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geoff, as of now i have your FR TS T4 Manifold with a BEP s366 with a/r .91 and on wastegate spring, 14psi, it hits full boost by 4800 rpm. what kinda spool and power @ xxpsi you are getting on the 8374?

 

Bump for 83/74 dyno sheet.

 

In fairness, that "old 68mm" turbine wheel is still a VERY efficient wheel capable of huge flow at high efficiencies. Just because it wasn't designed yesterday doesn't put it out of competition.

If anything, it shows that it was pretty hard to improve upon. The next step up at Garrett, aerodynamically, I don't think lends it's self well to mass production. I believe they use some non-radial blade curvature that requires extremely strong materials to hold up to the stresses that are induced by the design. This may be why BW went to that "superback" design.

Out of every feature, I find that back plate of the turbine the most interesting. It looks more like a compressor wheel then a standard turbine wheel now.

 

Geoff,

What's the chance that you could weigh the BW turbos as they start to be shipped out, and post the numbers for us weight-watchers? I imagine there are at least a couple other people out there who would appreciate this information.

Matt

 

what are the chances that the smallest efr turbo will fit the rb26 bay as low mountable?

 

Geoff, can we get a dimension across the outside of the compressor cover, the "Comp Cover B" like what's on the 7670 and 7064. Across the outside like the 7" dimension shown in this pic:

[IMG][/IMG]

 

It's not that new. I've seen that design used on diesel VNT turbos.

 

I've seen it used on big turbines for things like power generator stations. Just never seen it on an automotive turbo.

I suppose I should have said it is new to our market.

 

Geoff, when are turbos will be available for purchase?

 

http://www.supraforums.com/forum/sho....php?p=7951802

 

Thanks for the link, n2oiroc.

Here's some extracted screen shots of the Sierra-Sierra dyno run in the BW EFR youtube vid: BW EFR youtube vid







I'm assuming that the "WCF" displayed on the screen is a correction factor of some kind and it looks like the TQ/HP curve is visible on the lower right. If that's the case, then it seems to confirm that the 83/74 isn't going to spool all that early, especially considering that Sierra-Sierra runs a 2.2L engine.

l8r)

 

I *think* that was at 2.2 bar so its not full tilt.

 

EFR8374:



EFR9180:


Quote from Geoff about the tq dropoff so people don't freak out:

 

Am i reading that correctly? 717lb/ft at the wheels on a 2.2 and 300lb/ft by 4,100rpm?

 

Wow. talk about hard hitting!!! its going from 300tq to 700tq in just 700rpm. those poor gears...
cant wait to see some smaller turbo graphs....

the 9180 graph is prettier. thats some seriously fast spool for that size turbo..