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Im slammed today but wanted to add my input briefly, hope you guys dont mind:
-first of all, every 2011/2012/2013 EFR turbo is in stock -- EFR 6258, 6758, 7064, 7670, 8374, 9180 - all available with no wait. There is only backorders on the 2014 release EFR7163 (its a brand new production unit) and we're seeing a few, but are told this supply will improve greatly over the next few weeks. Anyone interested to get one, contact us and we will add you to the list (no cost) - once the turbos get here we will contact you with an option to purchase
-lucky2: I agree this is an exciting time for Turbocharger tech. You are correct that the EFR7163 offers EFR6758 spool with greater than EFR7064 performance. This is the first mixed flow turbine BW has used in a performance application and while it took some time to refine it - the end result was well worthwhile. The 63mm MFT wheel inertia is almost the same as the 58mm radial wheel... pretty incredible to realize that. The initial prototype 7163 test results were very positive and the production 7163 delivers 12% higher performance than those protos with no losses. (the Indy cars have been ecstatic with the gains over the previous 6758, this season they expect 2-3s faster lap times across the field)
-Def wrote "I've seen a ton of tests pitting them against old old Garrett stuff. The few comparisons I've seen between modern turbos basically shows very very little difference between them." The test results I see dont correspond what what youve seen. Either way I can understand your skepticism, however with all due respect, I have read many of your comments regarding the EFR turbos. I truly believe if you get any real-world experience with one of these turbos you will have a more thorough understanding/outlook. Having experience with so many turbo setups on stock SR20s over the years, even just the EFR6258 on a 100% stock SR20 is (to me) an eye-opener.
-Def (sorry dont mean to pick on you) -- the change in inertia is greater than you might initially realize. We wouldnt have bothered with all this gamma-ti headache if the difference was as small as you surmise.
-regarding the question of IWG control, the issue is usually confused by people who dont understand how to properly setup an IWG. best results continue to be with the OEM borgwarner stiff WG spring -- SIMPLE. This starts with a base boost of 14-15 psi and can go up to 30+psi. I run my evo with 8374 IWG and 0%wgdc = 15psi while 100% wgdc = 33-35psi. we have many customers with great results and love it (like myself) and some people prefer the EWG. thats why we offer both! in my experience, under 600whp i almost always prefer IWG
-Papadakis/Aasbo's WG's were rerouted to make more noise during drift events (crowds liked the louder EWG over the quiter IWG)
-mannykiller: a twinscroll 8374 will ROCK on a prepped 13B... have fun
thanks
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