1st day for Sierra Sierra to use the EFR turbo in competition - destroyed the old 1:43 track record and put down a 1:41

Dennis, Jethro, Richard and the EMP - those guys get it done!!

 

WOW! great news.

 

Hasn't ran yet. More money required. Yes R&R made the rods. Should be in action by the end of next year. Working on buying a house at the moment.

 

Big Congrats to everyone involved with that Beast!

LOL - more crow for the TS Haters to eat...

 

Well I'm sold on the 8374 , btw does it fit w/ the full-race down pipe/mid-pipe?

 

Geoff, in the real nice cutaway of an EFR turbo that I've seen in a couple places, I looked and looked, even took my glasses off to get my nose right up to the screen, darned if I can see any bearings in there.
So I'm wondering, the "dual-row ball bearing cartridge" they are using, maybe they just don't want anybody to get a good look at what's in there yet? Are the lawyers still working on that one? If they don't want us to see it I wish they would just come out and say so. I can handle that, I just don't want to keep wasting my time looking for it.

 

Ah yes, priorities.
Here's an external shot at the bearing cartridge.
4th pic down.
http://www.motoiq.com/magazine_artic...ature-set.aspx

 

no worries aaron! we will be at PRI if you are able to come out for that? Its a much more "Racing-oriented" event compared to SEMA so might be worthwhile. Sierra Sierra is on their way back from superlap and ill ask them to share their data, i cant make any promises but will definitely have some good results


i dont know if thats possible, but definitely could be done with the 7064. will be interesting to find out!


its a direct bolt-on to the Full-Race T4 manifold/dp/midpipe, however it requires some space be made at the front motor mount bracket (like the other BW turbos, very simple to do)

you got it bud! Hope you dont get too cold in the windy city this winter, although being from Colorado im sure youll be fine. thanks for all your help when you were down here im sure you are keeping the AMS crew happy

no problem at all - if you come to PRI you can check it out first-hand the design uses a multi row ceramic ball with an M50 bearing race. This is a very high end bearing, that outperforms anything tested previously (including the TR series bearing). People were walking by the booth all week long spinning these turbos in the demo so you could actually feel how slippery and friction-free the EFR bearing is. Im sure someone who spun it will post up (shame on me for not making a video)

like strm trpr posted, there is a great shot of the bearing cartridge vs a gt bearing on motoIQ



you can also see the double turbine seals AND triple compressor seals.

The turbine side double seals have two benefits - 1) reduces oil passing thru and burning (duh) but more importantly 2) reduces the crankcase pressure, becuase backpressure in a manifold will typically pass the turbine wheel, go into the center section, down the oil return and increases crankcase pressure

the compressor side you will be far less likely to have any oil vapors in the charge flow (presence of oil vapor reduces octane)

 

Very exciting.

I spoke with my friends from 2020 about the turbo and they were telling me about the TiAL wheels and the BB CHRA.

"it kept spinning... forever... it was insane" - BB CHRA
"the new turbine wheel is insanely light in comparison to the inconel turbine wheels of the past."

they seemed to re-iterate our greatest hopes

 

Sema was a blast, it was nice to see those cars in person. Brett said you guys would be addressing the motor mount issue for those of us with your manifold that want to try out this new turbo. Have you figured out a viable solution yet?

 

That would be an 800rpm improvement over existing technology. Seems like wishful thinking. I cant see the Tial wheel and smooth stainless housings making that big of an improvement. I did direct back to back swap years ago with plain bearing to BB and to my disappointment the turbo didnt spool any faster. Both turbos hit 21psi at the same 4100 rpm. there was no spool improvement. Transient response however was drastically different between the two. its important to understand how the friction at the bearing section effects spool and transient response because they are two different things. Spool is generally defined by and rpm point at which a set psi is reached. example an HTA green (57lb/min) reaches 30psi at 3800rpm in third gear. For this new EFR 7064 (56.5lb/min) to reach 30psi at 3000rpm under same conditions would be a revolutionary change. I am afraid the only way that can happen is if the exhaust housing is Variable geometry. The friction at the bearing housing is almost negligible at effecting spool speed. The rate of turbine speed change during spool is mostly a factor of available exhaust energy. very little energy is wasted at the bearings. changing the weight of the turbine is where I would estimate the turbo could spool 100-200rpm faster. if it does it 800rpm faster I will fall off my chair and sell a kindey so I can have one on each of my cars. I would actually be very exited to see 300-400rpm faster.

spool= turbine speed changes slowly. turbine speed 20,000-120,000rpm in 1.0 second.
transient=turbine speed changes rapidly. speeds from 20,000-120,000rpm in .1 seconds for bb turbo, and .25 for plain bearing. (tial estimate .05 sec)

The above examples are rough estimates to show spool and transient as two very different things as it applies to friction at bearing housing.

 

with that being said Jerry, it's a smaller compressor and a larger exhaust wheel(is that right)?
so there will be less inertia on the compressor side of things, and the exhaust wheel till have more "torque" as the diameter is larger. Will that not bring down the boost threshold level? (leve at which boost is produced). With the same amount of exhaust gas/energy, it will have greater force on the compressor blades.
So with the lower rotational inertia, that will obviously improve transient response (lag).

 

gtx 35r is out. at lower presser ratios it looks an awful lot like a 83/74 but cant hang at higher pressure ratios. it also appears to have the old 68mm turbine wheel and the same center section. i dont think borg warner has anything to worry about.

http://www.turbobygarrett.com/turbob...R_803715_1.htm

 

Geoff, do you mean that they have, at PRI, a cartridge that is all disassembled so people can look at the parts that are inside the cartridge? Or a cutaway drawing of the inside?

The cartridge and seal arrangement does look great. That comparison to "brand G" is hilarious.

 

When can i buy a 7064 kit for my built 2.2 ?

This year or next ?

How much ?

Delivery time ?

Cheers