Borg Warner EFR Turbocharger line
Posted 18 July 2012 - 04:52 PM
USA Daily: 2014 GT-R Black Edition, stock.
USA Dail..err..Project: 1978 280Z, minor suspension upgrades, VK56DE conversion in progress. - SOLD
AUS Race Car: 1973 240Z, L28ET, Autronic, GT35R. - For Sale
AUS Project: 1972 1600, 3200km old S15 SR20DET, ground up rebuild. - For Sale
Posted 25 September 2012 - 01:06 PM
Looks like I'm going to end up buying a GT3071 with a 0.63 ar Ford T3 housing and use an ATP ultimate internal wastegate. Piecing this turbo together makes me realize how great a deal the EFR is. The garrett is going to be almost $1600 by the time I get the wastegate and actuator. And I'll still be short a BOV and boost solenoid. The 6758 is listed at around $1450 or so. Oh well. Should still end up with a great turbo for what I want out of my engine.
Currently: Finally running/driving after 4 yrs down. Tuning and buttoning up all the random loose ends left over from a long term project.
Posted 03 April 2013 - 08:47 AM
Posted 18 May 2016 - 09:08 AM
I know that this is an old post, but I'm curious if there has been any more experience with these turbos. I see that the new EFR 7163 seems to be a great turbo for the Subaru guys. Looks like the performance of the 7064, but a spool time closer to the 6758. What do you guys think about fitting that on an L28ET?
Posted 19 May 2016 - 04:07 AM
I have a EFR 7064 on my L28. I really like it. Wish I could go a little smaller on the exhaust side but all in all a great turbo. Snug fit but it works. Spools quick but I cant wait to install ported header and refreshed head. I don't have much to compare it to I had a Garrett with a 1.06 exhaust previously.
Posted 20 April 2017 - 01:24 PM
Posted 20 April 2017 - 02:50 PM
The only thing I don't like about these turbos is the "Technical guide" kinda sucks as a technical document. Maybe i'm a picky engineer but.
What is the max EGT?
What is the max turbine speed?
How much oil pressure?
What are all the tolerances for the bearings?
What is the output signal of the speed sensor.
For a 126 page document there is sure a lot of bullshit non-information.
Posted 21 April 2017 - 06:22 AM
Posted 22 May 2017 - 05:39 PM
Jon from Full Race got me the answer. So FYI
-max EGT for the EFR turbos is 950C
-max turbine speed is rated in terms of "tip speed" and 560/ms. The specific RPM that 560m/s tip speed occurs depends on the diameter of the specific compressor wheel in question.
-oil pressure is regulated by the built in oil control orifice. Pressure range is stated as 30-100psi. we've had motorcycle and ATV customer engines at 15-20psi oil pressure and no issue surprisingly.
-bearings are m50 races with ceramic balls in aluminum cages (silver plated). Dimensional Tolerances are considered BW proprietary information and not shared outside of their internal engineering center.
-most of the EFR compressor wheels have 14 blades which corresponds to 2917 Hz (except the 6758 which uses a 12 blade wheel)
Posted A week ago
I think I would make another 30 whp with cams, as I lost power at the top end. For pump gas I would probably recommend someone buy bigger than then 6258. I am thinking about buying the 7163 down the road.
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