The Mainline ProHub hub dyno at DEFI Motorsports in Corona, California

Served from Corona, CA

Dyno tuning for San Bernardino County

Ontario, Rancho Cucamonga, Fontana, Chino and Upland are a comfortable run down the 15 or the 60. Worth the drive for a hub dyno.

(951) 405-4465

Why customers make the drive

We run a Mainline ProHub hub dyno rated to 3,400 hp. The wheels come off and the dyno bolts to the hubs, which takes tire slip out of the measurement entirely. Most shops within reach of San Bernardino County run roller dynos, where tire pressure and compound move the number between sessions.

Every session ends with the full sheet — ambient temperature, humidity, barometric pressure and the correction standard applied. Not a cropped screenshot of the peak. Read the methodology before you book anywhere, including here.

Towns we see regularly

Ontario
Rancho Cucamonga
Fontana
Chino
Chino Hills
Upland
San Bernardino
Rialto

What we do in the shop

Dyno tuning, dyno testing, cell rental, performance diagnostics and group club days. Any tune we sell can be done here with the car on the hubs instead of shipped — and some work, like a full custom calibration on a modified car, is best done that way.

Book a session

Reserve dyno time

Pick a slot online, or call and tell us the vehicle, the modifications and what you are trying to achieve. We will tell you what the session involves and whether we are the right shop for it.

IMPORTANT - ASSUMPTION OF RISK & RELEASE OF LIABILITY

I understand that dyno testing, custom or remote tuning, ECU/TCU flashing, datalogging, road testing, performance modification, and related services can place substantial stress on a vehicle and can expose, accelerate, or cause mechanical, electrical, drivetrain, tire/wheel, module/ECU, or other failures, including catastrophic failure, property damage, fire, loss of use, injury, or death. I represent that I own the vehicle or am authorized by its owner, have disclosed known defects and modifications, and voluntarily assume these risks.

For remote tuning, I accept the risks of inaccurate information, hardware/software incompatibility, interrupted flashing, communication or power loss, ECU/TCU corruption or “bricking,” recovery/towing costs, and Customer-controlled datalogging. I will operate and test the vehicle only safely and lawfully.

TO THE FULLEST EXTENT PERMITTED BY LAW, I RELEASE AND WAIVE CLAIMS AGAINST FASTUTV LLC D/B/A DEFI MOTORSPORTS AND ITS OWNERS, EMPLOYEES, TUNERS, TECHNICIANS, AGENTS, CONTRACTORS, AFFILIATES, AND INSURERS ARISING FROM THE INHERENT RISKS OF THE SERVICES OR THEIR ORDINARY NEGLIGENCE IN PERFORMING THE AUTHORIZED SERVICES.

I understand that DEFI does not guarantee horsepower, reliability, component life, drivability, emissions compliance, warranty coverage, or any particular result. I am responsible for legal/emissions compliance and for stopping vehicle operation if warning signs or abnormal conditions occur. This release does not waive liability or rights that applicable law does not permit to be waived. I have reviewed and agree to the full DEFI Motorsports Dyno Testing, Tuning & Performance Services Agreement, which is incorporated into this purchase/authorization.

I have read and agree to the DEFI Motorsports Dyno Testing, Tuning & Performance Services Agreement, including the Assumption of Risk and Release of Liability.

Tick the box to continue

(951) 405-4465

Mon–Fri 9:00am–6:00pm · Closed Sat & Sun

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