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EchoKnight Single Turbo 335i Sedan Build 2.0 – Doc Racing Kit

ABSOLUTELY NECESSARY ADDITIONAL PARTS:

TUNING:

MY UPGRADES:

PARTS TO REPLACE WHILE YOU’RE IN THERE:

TOOLS THAT MAKE THE JOB EASIER:

I installed the Doc Race single turbo kit and wanted to document the process as reference.

The doc race box came in and I could wait to open it up! The kit showed up pretty quickly about one (1) week after ordering it.  It came in 2 separate orders, a box from Precision (Turbo) and a large box from Docrace (everything else).

There were smaller boxes within the larger box.

The turbo kit was packaged well and looked very high quality.

The hot parts of the kit came ceramic coated from Docrace and includes almost everything (Hardware, o-rings, and Manifold install studs) to convert to single turbo!

Everything fit perfectly (almost), there was a few modifications needed such as turbo studs, placing washers on the engine mount to help with turbo clearance, etc..

Wrap Hot Parts!

Remove Turbos and Water Pump

Remove the lines attached to the engine block

Worked on the project over several weekends with Keith Morrill and Jamie Hepp so I didn’t document everything but I will attempt to highlight the most important parts. There is also and video summarizing the install at the bottom of this page.

    Wrap the downpipe AND manifold in exhaust heat wrap!
    Use heat sheath on the oil feed line and vacuum lines and anything that can be exposed to heat under the hood.
    Clock the turbo so that the oil feed line is at the top center of the cartridge.
    Wastegate springs… install them accordingly. I installed the single black spring (8.7psi) in each and I’m getting  11.6 psi at wastegate pressure. Apparently this kit is known to overboost by ~2psi and TiAL underrates their springs.
    Make sure the vacuum lines are not binding,  rubbing or pinched. Check them twice, I even heat wrapped them for protection.
    Install the Mac Solenoid into the OEM boost solenoid plug. Install the one of the old OEM boost solenoid and leave it plugged in for good measure.
    Load the JB4 with the correct firmware and Backend flash at N54tech.com.

Wrap Manifold with heat shielding

Install studs then install the Manifold on to the head with the nuts

Look at the beautiful Turbo in amazement

Install O2 Sensors with heat shielding

Install Turbo and make sure you clock it towards the intercooler piping!

This was the first time I tried to turn over this used motor and see if the single turbo kit worked…

REJOICE! The long nights paid off.


ABSOLUTELY NECESSARY ADDITIONAL PARTS:

TUNING:

MY UPGRADES:

PARTS TO REPLACE WHILE YOU’RE IN THERE:

TOOLS THAT MAKE THE JOB EASIER:

The car is a blast to drive and sounds amazing.

I’m frequently changing my oil (every 2-3k miles) for peace of mind. Always keep an eye on things. Check everything for melting or damage. I love this car and glad I completed this build!

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