Performance Dyno tuning & wiring solutions
Located in Portland, Oregon
At JMRacing, we specialize in wiring, tuning, and calibration for motorsport and performance applications. Whether you’re building a dedicated track car or refining your street setup, we help you unlock the full potential of your engine.
You get a complete solution — not just a tune that makes power on paper. From cold start to redline, we focus on real-world performance, reliability, and driveability. With our Mainline hub dyno, you get accurate, consistent results without tire slip or guesswork — so you know exactly what your car is capable of.
Nissan S14 | 2JZ-GTE with JMRacing Engine & PDM Chassis Harness
meet the owner
Behind JMRacing is James, a tuning and wiring specialist with deep roots in both professional motorsports and advanced vehicle electronics. He’s worked hands-on with Formula Drift, supported local race teams, and brings years of experience from R&D in the Electric Vehicle Industry.
That combination of motorsport precision and engineering discipline shapes how every project is approached — with accuracy, safety, and drivability as the foundation. James doesn’t just chase numbers; he builds cars that perform flawlessly, start to finish. Whether you’re after a competitive edge or a smoother, more reliable setup, you’ll get the same level of detail and care that goes into every pro-level build.
Our Services
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Dyno Tuning - Mainline Prohub 2wd 2000hp
Take advantage of our superior Mainline hub dyno for precise, repeatable measurement.
- Standalone ECU Installation & Tuning
- Horsepower Measurement
- Dyno Rental
& More!
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Motorsport wiring harnesses
We design and build wiring solutions that keep your car reliable, consistent, and race ready. From full motorsport-grade harnesses built to withstand the harshest conditions, to cost-friendly options that integrate seamlessly with your factory wiring. Every harness is tailored to your build, budget, and goals.
