B58 Doc Race Turbo Kit Build Progress

kern417 · 01-03-2021, 02:35 AM

I'll be using this thread to document my build with the new Doc Race Turbo Kit. Some details are still being ironed out, so I'll update the thread as the build progresses. Feel free to ask questions here, but I recommend watching the videos for more details.

Car:
440i 6MT RWD

Build:
Doc Race Turbo Kit
EFR8374 Turbo
TU Pump
550i Clutch
Ethanol Mix
**Stock Engine**

Goal 550whp (Dynojet figures)

Unboxing:

Stock Turbo Removal

Doc Race Install

Initial Impressions

Sound Clips (Cold Start, Revs, Fly Bys)

Testing with OTS maps

Dyno results with the TU pump

My recommendations for picking an EFR turbo on your DOCRace Kit

More driving footage

Dyno results with Dorch Stage 1 and Stage 2 HPFPs

TU Pump Dragy Runs

1-Year Review

vs ZLI 10-speed

vs C36S

luca10 · 01-03-2021, 12:57 PM

Quote:

Originally Posted by kern417

I'll be using this thread to document my build with the new Doc Race Turbo Kit. Some details are still being ironed out, so I'll update the thread as the build progresses. Feel free to ask questions here, but I recommend watching the videos for more details.

Car:
440i 6MT RWD

Build:
Doc Race Turbo Kit
EFR8374 Turbo
TU Pump
550i Clutch
Ethanol Mix
**Stock Engine**

Goal 550whp (Dynojet figures)

Unboxing:

Interested in how the clutch is going to hold up. I have the 550i clutch on my Vargas GC/TU set up, it's holding but quick shifts there's def a delay. Must be the CDV that I need to delete.

Anyways, interested in this build, can't wait to see!

weehe126 · 01-05-2021, 11:19 PM

Why only targeting 550whp? You could get that with any of the hybrid turbos and not add massive lag from the manifold/ large turbo.

kern417 · 01-06-2021, 01:56 AM

Quote:

Originally Posted by weehe126

Why only targeting 550whp? You could get that with any of the hybrid turbos and not add massive lag from the manifold/ large turbo.

I explained it in the video. The 8374 is the smallest turbo so no real lag, along with it being a proper ball bearing EFR turbo so less lag than other aftermarket options and basically the best transient response in the market. I am also limited by my fuel pump and clutch currently. A simple turbo swap in the future can support 1000hp when I'm ready to go that far.

mike@x-ph.com · 01-06-2021, 09:38 AM

Sub'd

Solid67 · 01-06-2021, 09:55 AM

Nice setup man very jelly haha. I find it interesting that DocRace gives you the options for the big EFR turbos except for the 8474. From what I read it only spools slightly slower if any than the 8374 but probably makes an additional 100whp.

TheFanatic · 01-06-2021, 11:11 AM

cant wait to see the long term reliability on this kit.

MTWO · 01-07-2021, 09:28 PM

Looking forward to this

kern417 · 01-08-2021, 02:45 PM

Quote:

Originally Posted by Solid67

Nice setup man very jelly haha. I find it interesting that DocRace gives you the options for the big EFR turbos except for the 8474. From what I read it only spools slightly slower if any than the 8374 but probably makes an additional 100whp.

Agreed. I'm not sure about making that much additional power, but it definitely has been proven to make more power and is more efficient at the same boost levels. However, the given turbo options do a good job of spreading across 600-1000hp+ range. Too many intermediate options may make it more confusing for consumers.

Currently waiting on my parts to get back from coating next week and I'll post some more pics.

luchocamp · 01-09-2021, 03:45 AM

Quote:

Originally Posted by kern417

Agreed. I'm not sure about making that much additional power, but it definitely has been proven to make more power and is more efficient at the same boost levels. However, the given turbo options do a good job of spreading across 600-1000hp+ range. Too many intermediate options may make it more confusing for consumers.

Currently waiting on my parts to get back from coating next week and I'll post some more pics.

on N55 efr 8374 you could make 132/133mph at 1320mts lag is similar to oem ... on your B58 it should be a great choice .. keep it up !

jzsb · 01-15-2021, 11:58 AM

Looks good! I am waiting for the spool performance top mount!

kern417 · 01-22-2021, 01:10 PM

Thanks. Should be beginning the teardown this weekend.

paimon.soror · 01-22-2021, 08:58 PM

oh man this is exciting, great video, subbed.

kern417 · 02-02-2021, 03:35 PM

Some progress this weekend. Unfortunately Things are going a bit slow, but I hope to complete the install this coming up weekend. Then DIY video to follow shortly.

MTWO · 02-02-2021, 10:08 PM

Looking good!

TheFanatic · 02-03-2021, 06:36 AM

Quote:

Originally Posted by kern417

Some progress this weekend. Unfortunately Things are going a bit slow, but I hope to complete the install this coming up weekend. Then DIY video to follow shortly.

Looks like this would ultimately be rather easy to work on. I'm curious to how well it holds up to heat soak because they just cram this tiny filter on the front of the turbo with no heat shielding. You gonna get a turbo blanket for it too?

MTWO · 02-07-2021, 12:05 AM

What sort of coating is on that manifold?

kern417 · 02-10-2021, 01:35 PM

Quote:

Originally Posted by TheFanatic

Looks like this would ultimately be rather easy to work on. I'm curious to how well it holds up to heat soak because they just cram this tiny filter on the front of the turbo with no heat shielding. You gonna get a turbo blanket for it too?

Yes

Quote:

Originally Posted by MTWO

What sort of coating is on that manifold?

ceramic coating to insulate heat in the runners and downpipe. The goal is to reduce engine bay temps with the turbo mounted up above the cylinder head/valve cover.

kern417 · 02-17-2021, 01:50 AM

DIY will post later this week

TheFanatic · 02-17-2021, 07:25 AM

Quote:

Originally Posted by kern417

DIY will post later this week

Does the engine cover still fit on with that turbo?

kern417 · 02-17-2021, 03:27 PM

Quote:

Originally Posted by TheFanatic

Does the engine cover still fit on with that turbo?

Yes

MTWO · 02-17-2021, 08:59 PM

Looks awesome!

01-05-2021, 11:19 PM	#3
weehe126 Brigadier General 1161 Rep 3,189 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	Why only targeting 550whp? You could get that with any of the hybrid turbos and not add massive lag from the manifold/ large turbo.
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01-06-2021, 09:38 AM	#5
mike@x-ph.com BimmerPost Supporting Vendor 24163 Rep 190,725 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	Sub'd __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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01-06-2021, 09:55 AM	#6
Solid67 Lieutenant 187 Rep 458 Posts Drives: 2019 M240i xDrive MP Edition Join Date: Mar 2019 Location: Fairfax, VA iTrader: (0)	Nice setup man very jelly haha. I find it interesting that DocRace gives you the options for the big EFR turbos except for the 8474. From what I read it only spools slightly slower if any than the 8374 but probably makes an additional 100whp. __________________ 2019 M240i M Performance Edition / xDrive / ZF8 / BM3 Stg 2+ E30 / xHP Stg 3 / Dorch Stg 2 HPFP / Evolution Racewerks Catless Downpipe / MPPSK Exhaust / FTP Drop in Filter / FTP Intake Pipe / FTP Chargepipe / NGK 94201 Spark Plugs .022 / Michelin PS4S - 225/35/19 + 245/30/19
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01-06-2021, 11:11 AM	#7
TheFanatic Second Lieutenant 112 Rep 216 Posts Drives: BMW 340i Join Date: May 2020 Location: Wisconsin iTrader: (0)	cant wait to see the long term reliability on this kit.
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01-07-2021, 09:28 PM	#8
MTWO Captain 473 Rep 931 Posts Drives: M2 Join Date: Dec 2016 Location: Innisfil iTrader: (0)	Looking forward to this
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01-15-2021, 11:58 AM	#11
jzsb Registered 2 Rep 4 Posts Drives: bmw 340i xdrive Join Date: Jan 2021 Location: washington iTrader: (0)	Looks good! I am waiting for the spool performance top mount!
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01-22-2021, 08:58 PM	#13
paimon.soror Captain 629 Rep 965 Posts Drives: 2016 F36 435x MSport Join Date: Oct 2017 Location: Hartford, CT iTrader: (3) Garage List 2016 BMW 435xi GC [6.00]	oh man this is exciting, great video, subbed. __________________ 2010 Mazda RX8 - Sold (11/17) 2016 BMW 435xi GC - Current
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02-02-2021, 10:08 PM	#15
MTWO Captain 473 Rep 931 Posts Drives: M2 Join Date: Dec 2016 Location: Innisfil iTrader: (0)	Looking good!
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02-07-2021, 12:05 AM	#17
MTWO Captain 473 Rep 931 Posts Drives: M2 Join Date: Dec 2016 Location: Innisfil iTrader: (0)	What sort of coating is on that manifold?
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02-17-2021, 08:59 PM	#22
MTWO Captain 473 Rep 931 Posts Drives: M2 Join Date: Dec 2016 Location: Innisfil iTrader: (0)	Looks awesome!
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