[Closed] Borg Warner Efr Series Turbos

[bigmikespec]

Looks like they have changed the casting process now so he is actually right and the current ones are all going to have these new manky housings

Sorry, I re-read his post, makes sense... apologies Brad.

[infamous_t]

Just talked to Jon @ Full Race who also confirmed that BW have changed the manufacturing process on these to ramp up the production rate.

He did say that particular one in the bimmer forum thread above was the worst he has seen though.

[9krpm]

Richard, are 6258s the largest twin you can fit in the engine? Im keen to try a set on my OS rb26/30 time attack r32. I don't mind whether it's internal or external gates but Im keeping with the twin for response.

front turbo is low and quite forward, rear turbo sits higher to allow it's intake to clear the front turbos dump.

pics just for you sweet heart.

Edited November 21, 2012 by 9krpm

[zErTeK[2k]]

Seeing as you guys are hanging for some results, not that it is overly relevant to you guys but will give you some idea. Were not leaning on it in any way shape or form, when my new motor is finished we will really see how it performs.

Stock Evo 5 Motor apart from

EFR7064 T4 1.05

HKS 274/278 Cams

Plazmaman Cooler

ID1000's

Aeromotive 340 Pump

Okada Projects Coils

Vipec ECU

Running on Caltex E-Flex

[bradsm87]

Nice! I'm hoping for boost earlier than that but I only really want/need 250rwkw so hopefully my smaller turbine housing, smaller cams, 160cc more capacity and higher comp engine will give me my target boost threshold of about 3000rpm. Fingers crossed.

[zErTeK[2k]]

I think for 250kw u have the wrong turbo, this thing will go 350 on my new motor. We could get boost on earlier as we havent touched the cams yet but ont he stock motor we dont want to put to much stress on it. New motor will be higher comp and mivec so will come on much sooner.

[bradsm87]

The problem is that the EFR 6758 is quite inefficient compared to the others, especially at low boost. Also the only turbine housing option is the T2 .64 which is too restrictive for my engine. I'm building a high compression, high flowing engine to run a big turbo at low boost. I could whack a 6258 on it and run 22psi but that's not the type of setup I want to run.

I plan to replace the 7064 with a 7163 with the divided 0.80 housing after a year or so.

Edited November 22, 2012 by bradsm87

[zErTeK[2k]]

fair enough, yea the 7163 looks the goods, I wonder if it could make it to 380.... I think I will be moving up to a 7670 on my new engine as I want to turn it to 9500 and I think the 7064 will struggle to hold 28-30psi at that kind of rpm, even the 7670 might struggle, maybe an 8374 will be on the cards haha.

[Sub Boy32]

http://forums.bimmerforums.com/forum/showthread.php?t=1919765

Crikey.....I do prefer the look of my investment cast 8374 housing, however I am concidering going to a 1.06a/r rear in the future:(. Oh well, if it doesn't hurt performance, so be it.

[bradsm87]

Only the .92's have these housings. All the others are still investment cast.

[Sub Boy32]

Only the .92's have these housings. All the others are still investment cast.

Are you sure on this? Surely they wouldn't use two types of casting for the turbos?

[Nee-san]

Just to be certain, this is the EFR series only and not the other BW lines ?

[bradsm87]

I believe so because the .92 internal gate is the by far the hardest to cast and that's the one that's been pretty much completely unavailable until now.

[bradsm87]

I just got mine and mine is just as bad as the one in the pics including the far off-centre bolt holes. I've been waiting so long that I'm just going to fill in one side on the turbine entry to make it smaller and symmetrical because I'll be blocking the internal gate anyway so may as well block it using a couple of bits of stainless plate to better direct air into the housing.

[GTScotT]

that farking sucks... so the bolt holes are only the beginning of the issues? the turbine ports dont gasket match either?

[Nee-san]

Looks like it's back to the drawing board...

[Lithium]

Bloody hell, that sucks to hear and is beyond embarrassing. I had just warmed up to the idea of EFRs again too

[R31Nismoid]

Wonder where the EFR Promotional machine is now?

[GTScotT]

Wonder where the EFR Promotional machine is now?

BSOD while loading page.

[bri73y]

Don't know if I'd want something that looks like a China copy mounted high and proud in my engine bay, regardless of the performance benefits.