Help me pick a turbo kit!

Which turbo kit would you buy

  • Doc Race top mount

    Votes: 20 33.9%
  • 4N Performance bottom mount

    Votes: 3 5.1%
  • Vargas single bottom mount

    Votes: 5 8.5%
  • VI Engineered top mount

    Votes: 4 6.8%
  • ACF top mount

    Votes: 9 15.3%
  • Motiv bottom mount

    Votes: 18 30.5%
  • ADE bottom mount

    Votes: 3 5.1%
  • ACF bottom mount

    Votes: 2 3.4%
  • CES bottom mount

    Votes: 6 10.2%
  • Something that hasn’t been announced yet

    Votes: 6 10.2%

  • Total voters
    59

Payam@BMS

Sergeant
Oct 27, 2016
412
265
25
33
Do not expect an EFR turbo. To be honest, the EFR is a lot of hype even though they make pretty graphs. Great for people who need extreme transient response but basically over 3k rpm and the GTX series is the way to go IMO, it even performs better on the top end. The EFR is a bulky, hunk of a turbo that causes the kit designed around it have compromises.

Only if the fabricator is not competent enough... My kit does not have anything compromised.
 

doublespaces

Administrator
Oct 18, 2016
9,303
4,331
0
AZ
Ride
2009 E93 335i
Only if the fabricator is not competent enough... My kit does not have anything compromised.

Yes, certainly that statement is not all inclusive. Less room does mean less options, generally speaking. Getting it to fit, and work, is a testament to the amount of effort that went into this ACF kit.
 

ShocknAwe

Captain
Jan 24, 2018
1,470
1
728
0
Charleston, SC
Ride
N54/3 1er ///Mutt
are you talking about the speedtech kit here? After reading, I'm not terribly interested in the BW EFR, think Garrett is the way to go, but if their N55 kits feature an EFR option, why don't you think they will do the same with the N54?

Do not expect an EFR turbo. To be honest, the EFR is a lot of hype even though they make pretty graphs. Great for people who need extreme transient response but basically over 3k rpm and the GTX series is the way to go IMO, it even performs better on the top end. The EFR is a bulky, hunk of a turbo that causes the kit designed around it have compromises.
 

luchocamp

Corporal
Dec 9, 2017
147
81
0
Ride
f30 335ix / e90 335xi
My Speedtech stg 3 with EFR8374 makes 11.5@122mph at 15psi of boost with Dragy. I am dialing every weekend

Exactly. Efr needs 30+ psi. No good for n54 high compression engine, especially with oem rods and pistons.
 

Vitan

Specialist
Nov 20, 2016
81
27
0
Pilsen, Czech Republic
Ride
Alpina b3s ST, Cls55 amg
My Speedtech stg 3 with EFR8374 makes 11.5@122mph at 15psi of boost with Dragy. I am dialing every weekend

EFRs are good turbos, one of the best in transient response, areas under the curve, but vs gtx they shine in in higher pressure ratios. Between 20-30psi garrett is more efficient.
Btw. Speedtech st. 3 looks great. I want similar manifold for n54 so much...
 
  • Agree
Reactions: doublespaces

luchocamp

Corporal
Dec 9, 2017
147
81
0
Ride
f30 335ix / e90 335xi

Jlcn54

Private
Mar 2, 2017
40
14
0
So EFR are the best for spool, PTE best for top end, Garret best for happy medium? Lol
 

cloud9blue

Sergeant
Oct 17, 2017
255
190
0
Ride
09 E92 335i
I might be wrong, since I am not very familiar with the N55's JB4 datalog. But from speedtech's own dyno, it looks like they are suffering from boost creep with these IWG EFR turbos.

https://www.speedtech.com/bmw-n55
Speedtech_N55_24psi_JB4.jpg
 
  • Disagree
Reactions: luchocamp
Jan 19, 2017
22
40
0

Hi guys, we haven't had any boost creep issues. I should probably post an updated log, as the one shown above was an early run (beta bm3 flash testing), and for that run, was limited to the 12psi max JB4 offset over DME_BT, so if you follow the gray line (dme_bt), it is exactly 12psi lower than actual boost, so as the dme target increases, the JB4 lets boost increase also, so it ramped from around 17 to 24 on that run. We've run the EFR's anywhere from stock boost to 30psi. I recently setup an EFR7670 on our 2011 335xi, and had run it on stock flash/boost for a few days... while super boring, it does fine holding down to 5psi if need be. If anyone cares to see a graph of an EFR on stock dme boost, I can sure post up something, but kinda figured anyone looking at getting one of these kits could care less about stock boost.
 

LoBoost

Sergeant
Dec 22, 2017
251
172
0
Ride
2008 135i, 2014 GTR
Well,

Picked a turbo kit! I ordered a VI Engineered top mount kit with a Garret GTX 3584RS turbo with a divided T4, and 1.01 A/R. Jon also was able to customize the downpipe a bit to a 3.5 inch downpipe with single discharge (no "V" split to mate to stock exhaust). I'll be having a custom 3.5 inch exhaust made once I have the kit installed.

I'm going to have all the hot parts coated by Swaintech.

Hopefully with this kit + Syvecs I can make some decent power. I think early 2019 I'll probably looking for a built motor and head!!
 

Abacus38

Lieutenant
Nov 2, 2016
643
385
0
34
Tampa/Orlando, FL
Ride
2007 Ti Ag 335i
Well,

Picked a turbo kit! I ordered a VI Engineered top mount kit with a Garret GTX 3584RS turbo with a divided T4, and 1.01 A/R. Jon also was able to customize the downpipe a bit to a 3.5 inch downpipe with single discharge (no "V" split to mate to stock exhaust). I'll be having a custom 3.5 inch exhaust made once I have the kit installed.

I'm going to have all the hot parts coated by Swaintech.

Hopefully with this kit + Syvecs I can make some decent power. I think early 2019 I'll probably looking for a built motor and head!!


GTX3584_COMP_0.jpg


On a built motor you might be able to get 900whp but its more then enough for stock motor duty. Furthermore you don't have to worry about running that turbo to absolute limit
 
  • Like
Reactions: LoBoost