Lol @ 2071 and 2650.

 

But I walk to school...

 

Safest possible answer for all of us.

 

Cheaper too

 

 

turbobygarret.com only lists a 60mm turbine for the 3071.
the 2871 turbine is 54mm.

and they only list a t3 housing for the 3071 or a v-band.

what am I missing here?

 

Dig deeper, padawan

https://www.atpturbo.com/mm5/merchant.mvc?Screen=PROD&Product_Code=GRT-TBO-025

https://www.turbobygarrett.com/turbo...00382-3_20.pdf

The 56.5mm wheel is why FM always made decent numbers from their 3071R 0.64a/r setups, but everyone with a 2860RS or 2871R (54mm turbine) needed the 0.86a/r housing.

The EFR's 58mm turbine is one of the secrets behind the huge power numbers it can produce. It makes up for the loss in spool that normally accompanies that extra size by using trick materials to keep the weight and response time down.

 

you gotta go "off the menu"

 

still a different turbine wheel than a 2871... 56.5mm =/= 53.85mm

and I wonder if it's a 10 vs 9 blade design. anyway, a standard 3071 and a standard 2871 are not "almost identical"

 

When I went from ebay 3076 to EFR 7670 (same size compressor, but vastly larger turbine on EFR) the spool stayed the same, but power went up about 20%. Flows wayyy more than the smaller turbine.

 

also probably has something to do with going from an ebay turbo to an authentic turbo. was the ebay 3076 ball bearing? I haven't looked at ebay turbos in so long I wouldn't be surprised if they have the ability to offer BB now....

your engine is probably happier with a larger turbine too... less backpressure in the turbo manifold.

 

They do in fact offer BB turbos now, but mine was a regular journal bearing one.

The engine does like the larger turbine. Interestingly I tried .63 and .82 A/R turbine housings on the ebay 3076, the .82 was a touch faster up top, but spooled a lot worse and overall the car felt slower. Car went faster at the drag strip with the smaller A/R turbine housing.