Ha ha ha
Proof please.

Standard GT35R setups have made over 650 WHP on AWD Mustang dynos and over 750WHP on AWD dynojets. I'd LOVE to see even the 7670 do that and it's a 57mm inducer.

They don't make a 54mm inducer EFR turbo anyway so I'm pretty sure you have no proof at all of that claim...

 

7670 isn't that far from an old GT3582R in terms of power... however I wouldn't say that a 7670 will make more power than a GT35R... nope. The new GT3576R is very similar to 7670 (makes more power), and it is right there in terms of power with the old skool GT35R.

maybe spdracrut can chime in.

 

I'll say this now, and I am just kidding, but you really need to do a little less typing and a little more wrenching and get that LR2.2L up and ripping with the 8374 hung off the front of it...

We're all dying to see the results of your Evo's next Evolution.

Believe me, I know how life can get in the way.

Oh, and congrats on the Career move and move to Alabama.

Now you should be closer to Ted B. and Drifto...

 

R/T, if it's close to a GT35R on power or not is still up for debate, but that still doesn't change the fact that it's a 57mm wheel and not a 54mm wheel.

Not that inducer is the end all be all of airflow capacity, but 54mm vs 61mm is nearly a 30% reduction in flow area and I was just throwing the BS flag on that claim.

 

I wasn't being exact lol. Just exaggerating to make a point. However, I still stand by that an EFR with a smaller but close to a garret inducer wheel will most likely provide more flow. Btw, they do make a 54mm EFR and it's called a 6758 which I had on my car, it's technically 53.9mm. It can make more power than a 3071 with a smaller inducer wheel. I'm pretty sure a 7670 can make 600+whp lol. I made 415whp on my tiny 6758 at only 24 psi.

Anyways, my EFR was my old set up. It blew out unfortunately on the way to a 1/2 mile drag event. I now have a 25g which is similar to the 35r, so I will be testing that and comparing. I'm pretty sure this 25g will make much more power, but I don't think it will have as nice of a powerband as the EFR.

 

The 6758 appears to be a 54 TRIM, not 54mm. That equates to an inducer diameter of 49.2mm.



So that falls right in line with the GTX3067, 55 trim wheel (49.7mm inducer).


As for the 7670, the compressor does flow 64 lbs/min. So yeah, on E85/race gas, that should be good for over 600whp.


Oh yeah, this is the old school GT3582 with a ported shroud


Without ported shroud:

 

you do realize that the picture you linked says "53.9mm inducer" in the upper left corner, right?

 

You're wrong on some of the mm inducer specs. You are however proving me right in almost every graph. BTW, look at R/T's 7670 set up he has 550whp at 25 psi, the turbo can be turned up to 35+psi and still be on the compressor map in the graph. I'm sure it can do 650+whp on racegas.

Mhmm, lol.

 

Edit: I stand corrected by material presented by griceiv.

 

a "yes" would have sufficed.

 

not that I really care, but all the information I can find about the efr's says that the 62mm and 67mm compressors are in fact 65 trim and 70mm-83mm compressors are 56 trim. i've not see any reference to the 67mm compressor being a 54 trim.

http://www.full-race.com/articles/efrturbotechbrief.pdf
page 12.

I'm sure Mike will be here in a bit reminding everyone that the inlet conditions used to make Garrett compressor maps are different than those used to make BW maps and thus the flow data isn't directly comparable.

 

I'll soon be on the band wagon with an 8374 efr ewg .105. As a few questions what is the actual weight of the turbo and anyone got an idea on its operating temperatures? And generally under track use what sort of heat temperatures would kick out of it?

 

This might be a good place to point out that the way the 64 lb per min "rating" is arrived at for the EFR7670 is a little odd compared to how other manufacturers do it. The EFR ratings look like they come from the top speed curve - extended all the way down to PR 1.0.
For one thing I'm not so sure this is even right, and even if it is technically ok, it is so far off the labeled efficiency isolines - it would be at efficiency what - 50%? 40%? If you ignore that extended speed line and just say that the map ends at the 65% efficiency line, or even the 60% line if you imagined it going up that far, you'd have a "rating" of a few pounds less.

 

Thanks for the link. So I was wrong after all and stand corrected. My bad for being an ***! In my defense, it was late at night after a 12 hour day at work and it kinda boggles my mind that the 54mm inducer EFR wheel flows basically the same as the 50mm inducer (67mm exducer) GTX wheel, or way less than the GTX 54mm inducer (71mm exducer).

So, this does make for a very interesting comparison and some insight into different compressor wheel designs. If you estimate the maximum flow of the EFR 67mm wheel at 60% eff similar to the Garrett map, the EFR wheel is right around 47 lbs/min. So the same as the GTX 67mm wheel basically, but the EFR has a much larger inducer which is basically the same as the 57 lbs/min GTX 71mm wheel.

Two major differences in the map: the peak efficiency value and the location of the peak efficiency island. The EFR 67mm has it's 75% peak efficiency island at a higher ~2.5 pressure ratio. The GTX 67mm wheel has it's 79% peak eff. centered around 2.0 pressure ratio.

The EFR map shows wheel tip speed, so 412m/s tip speed is about 117,500rpm for a 67mm wheel. Close to the 120k speed line on the GTX map. The EFR is at about 2.4 PR whereas the GTX is at ~2.6PR. At this speed line, the EFR surges at about 16 lbs/min, and the GTX is around 17 lbs/min or so.

490m/s tip speed is like 139.5k speed, which is close to the 135k speed on the Garrett map. I wonder if they benchmarked each others maps, ha! I mean, who says, oh, let's go at 490m/s tip speed? why not an even 500? But anyways.... EFR starts off at about 3.1 PR and 30 lbs/min, the GTX at ~3.2PR and 25 lbs/min.

So anyway, interesting how the big trim, tall full and short blade compressor wheel flows compared to the smaller trim all full blades compressor wheel.

Edit: I read the EFR document a bit more. The 6758 comes with a 2.5" inlet hose connection with NO ported shroud/slot. So now it makes more sense. I think the GTX 67mm does have a ported shroud requiring a 3" hose connection. So what I think happened was, BW said we want to only go as big as 2.5" to help packaging and we therefore need the big trim wheel to get more flow. So I bet all the 70-83mm EFR wheels have ported shrouds in their compressor housings and therefore they could trim the wheels down to 56 trim. So it shows how dramatic the effect on compressor performance the ported shroud has.

 

NVRMD

Has anyone heard if Borg Warner plans to build an EFR8070 like their Airwerks JB turbo?