The most talked ever not in stock Borg Warner EFR series vs the new Garrett GTX series. Comparisons were run by Perrin. More comparison dyno charts available on the forum site on the following pages.
Originally Posted by PERRINJeff
Borg Warner EFR Turbos
EFR7670 Like a lot of guys out there, we have been waiting for an EFR to play with for a long time! Someone took this picture of me about a month ago waiting. Ok not really it was from today, but it sure feels like i have been waiting forever.  I know there is no proven power yet, but very very soon. Maybe Nasioc can make a new Turbo section for things like this... Like the GTX thread i started there will be great data to surf through. Lets start with simple things like pics. I have a bunch more coming don't worry!  Even the badge is way nicer!  The compressor wheel is amazing looking just wait until the shroud comes off.  EFR is 3.25" taller overall and like others have said, this is going to be a challenge to fit into the car for sure!  This is probably my favorite part of the whole turbo. The SS housing is very high quality and the internal wastegate routing is very cool. The angle of the exit is angled perfectly off the inlet. VERY cool.  Another angle showing the turbine.  One of the things i was looking forward is the BOV and how its integrated. It just like the Mini coopers we deal with that have a very similar style. The pressure port is tiny, the spring is pretty weak, but small port means less overall force acting upon it. I know guys are going to be concerned that the port is too small to dump the boost it might see, but it works fine on Minis running 24psi, as well as a bunch of other euro cars. There are stiffer springs available for them but we will have to see how these work first.  The EFR compressor housing is smaller OD than the Garrett. Also has a smaller inlet, which is great for fittment reasons and shouldn't hinder HP at all.  HEre is a side by side of the EFR and the Garrett housings. You can see which one is much nicer. The EFR casting is smooth, not dinged up as though its been thrown across the floor a few times.  |
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Originally Posted by PERRINJeff
Here are the other important things to compare. I tried to take a picture showing the finish of the two wheels. I think it came out pretty good. The EFR wheel is a machined forging and you can see the feed rate of the machining is very slow making these pretty much polished!
 Compare the GTX wheel and you can see how much faster they machine the part by the deeper grooves. Borg Warner really took their time making these new turbos really nice. Its hard to see in this pictures, but the GTX wheels are much shorter compared to the EFR compressor wheels. Its very interesting up close as they shape of the fins are very very different. Its like comparing fins on a ceiling fan to fins on a jet engine.  The one part that i think really make people go crazy is the Gamma Titanium turbine wheel. Its finish is very very nice. The flat bottom of the turbine wheel makes it very strong and also more aerodynamic compared to the split Garrett type. Again the turbine wheel fin design is different.  The Garrett turbine wheel is shaped different, and also has a much thinner cross section. You can almost make it out in the pics. Brock at Borg Warner told me that you have to go up a size in the EFR turbine wheel OD, to compare against a Garrett. In this case 70mm EFR will be similar to the 60mm GTX. Which this makes more sense base on the overall volume the turbine wheel being slightly less with an EFR of the same given OD as a Garrett.  Beside that stuff here are some other cool pics from BWTS.  This cross section shows why the turbo is so much longer. The dual caged ceramic ball bearings are spread far apart for stability, notice the 4 oil seals (Garrett has 2), the oiling mechanism is designed to push oil to the front and back bearings, the coolant jacket spreads deep into the turbine wheel area, the really cool BOV return port and all the other really cool stuff. You can really tell this is over built and designed for abuse.  Here is the GT3076R. You can't see the bearings in this but you get the idea.They don't recommend going 20 degrees of kilter with the EFR, but with the better oil slinger and dual seals on both ends, i bet you could do close to 45 degrees.  These are the 3 main castings used on all the current models of the turbos.   Now the fun begins trying to make this fit! EFR Turbo Technical Brief Here is a very in depth article about the EFR turbos and how they came to be. This article is what really got me going on these turbos. Never before has turbo company done this kind of public documentation. Click Here to Download EFR Turbo Technical breif.pdf |
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