JMRacing

Portland based Dyno Tuning & Wiring.

04/12/2026

Freshly built Supra in for a custom engine harness paired with an EMU Pro 8.

Proper wiring and electronics made the break-in tuning go smoothly. Always a good sign when everything works right out of the gate.

Looking forward to having it back on E85 and seeing what it puts down 🔥

04/04/2026

Take your SR to the next level with our complete management package.

Full details and purchase available at our website in bio

03/19/2026

Installed & wired in some additional sensors before the flex tune on this S13. Swipe to see the graphs ->

Stock internal SR20DET
Garrett 2871R
17psi Pump gas
19psi E60 Blend

03/11/2026

Beautifully done S13 putting down power on our Mainline 🔥

Built SR20DET
G25-550
E85

02/16/2026

This was a fun one 🔥 motorsport-grade engine and chassis harness for an SR20 powered R32 Skyline.

•ECUMaster EMU Pro 8
•ECUMaster PMU-24DL
•Haltech UC-10

Concentric twisted tefzel wire loomed with Raychem DR25 and sealed with epoxied heat molded boots. Built for reliability under any conditions.

01/19/2026

Engine loom for a fully built SR20 running an EMU PRO. We took full advantage of the ECU’s extensive I/O and designed a harness engineered for reliability, serviceability, and real-world abuse.

Purpose built, motorsport grade, and ready for anything.

DM/Email for your custom wiring harness needs!

01/14/2026

G80 M3 Comp laying down some power with a custom Flex Fuel tune 🔥

01/09/2026

725whp S58 MHD+ Flex Fuel Custom Tune by on our Mainline Prohub Dyno.

Smooth, Strong, Repeatable. Book your session and level up your BMW

01/08/2026

2JZ-GE VVTi swap harness for an EMU Black–equipped 4Runner heading out the door!

Got a unique swap or ECU setup? Let us handle the wiring so you can focus on enjoying the build. Modern electronics, old chassis, done right.

01/03/2026

G80 M3 Competition MHD+ Flex Fuel custom calibration completed by

The S58 platform demands more than an off-the-shelf approach. Bend Calibration’s expertise paired with the precision of our Mainline Hub Dyno results in power you can trust from one of BMW’s most advanced M platforms.

No shortcuts. No generic maps.
The gold standard for S58 tuning.

📍 Portland, OR

12/29/2025

2JZ GT86 Flex Fuel tuned on EMU Black V3. 🔥

462whp 17psi 92oct / 601whp 23psi E85

Address

Portland, OR
97086-97299

Website

http://jmracing.net/

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