160 Vander St, Ste D, Corona, CA 92878
The wheels come off.
Most shops within an hour of here run a roller and measure your power after it has passed through a tire. Our Mainline ProHub is the latest generation of dyno technology: it connects directly to the wheel hubs — no tire, no slip, no straps — and verifies the entire power band, from 5 to 3,400 wheel horsepower. It is the most precision money can buy.
- 0
- variables in the number
- No tire, no slip, no straps
- 100%
- of the power band verified
- Every rpm on the curve, not just the peak
- 3
- conditions logged on every run
- Temperature, humidity, barometric pressure
Pulls from the cell
In the cell
Wheels off, hubs bolted, weather station logging. Every session runs the same way.
One car · one session · three calibrations
What that actually
buys you.
A C8 Corvette Stingray came in stock, left on E85, and every run in between is on the sheet. Baseline first, pump gasoline second, ethanol third — same mounting, same operator, same afternoon.
We publish the correction standard and the reference conditions because without them a horsepower figure is a number without units. Anyone can quote a peak. We verify the entire power band — every point on the curve, not just the highest one.
All three runs on one set of axes, exactly as the cell displays them.
Hub versus roller
Nothing here can move the number
On a roller the reading shifts with tire compound, pressure, temperature, alignment and how the car sits on the drum. On a hub, none of that is in the measurement — the same car reads the same.
Our dyno
A roller dyno
How it connects
The measurement is taken directly on the car. Nothing sits between the drivetrain and the number.
Ours
Mechanically connected to the wheel hubs
A roller
A tire resting on a drum
Tires, alignment, placement
Change nothing about the car and a roller can still read differently.
Ours
Not in the measurement at all
A roller
Compound, pressure, heat, alignment and drum position all move the reading
Mounting
Strap tension changes a roller reading. We mount cars; we do not strap them.
Ours
Bolted to the dyno — no straps
A roller
Held down by strap tension
Same car, next month
A before-and-after is only worth something if the "before" holds still.
Ours
Nothing has changed — it reads the same
A roller
Can move without you touching the car
Because the dyno is connected directly to the car, the power on the sheet is the power the car puts down on the road — it will not change with tires, alignment or how the car was positioned. A roller dyno is not a bad instrument and plenty of good shops run one. It is simply measuring through a tire, and the tire changes.
What a day here looks like
Five stages, in this order, every time
Most customers have never watched a car get tuned. Here is exactly what you are paying for, and where in the day it happens.
- 01
Health check, before anything spins
Plugs, codes, leaks, fuel system, cooling. If something is going to fail under load we would rather find it in the bay than at 6,000 rpm — and if the car is not fit to tune we will tell you before you have paid for the day.
- 02
Wheels off, hubs on
The car is mechanically connected to the dyno at the wheel hubs — mounted, not strapped. This is the part most customers have never seen and it is worth watching.
- 03
Baseline pull, conditions logged
Ambient temperature, humidity and barometric pressure recorded on the run. Every subsequent number on the day is compared against this one, on the same equipment, in the same session.
- 04
Calibration under load
Fuelling, spark, torque management, throttle response and boost control worked together — watching knock, intake air temperature and lambda on every pass. Moving one without the others is how engines get hurt.
- 05
Verification, then the sheet
Datalogged confirmation pulls, then the complete sheet — every run on it, not just the best one, with the correction standard printed across the top.
Five ways to use the cell
Book the machine
Some of it is calibration. Some of it is measurement. Some of it is renting you a very expensive machine and an operator who knows how to run it.
Most booked
Dyno tuning in Corona
Calibration developed under load on a hub dyno, with the conditions published on every sheet you leave with.
From $850 + licensingTuning $500 + dyno session $350. Factory ECUs the RTD4 supports add the RTD4: $1,200 + licensing
Dyno tuning
Dyno testing
$350/hrMeasurement without calibration. Find out what the car actually makes, under conditions we publish.
Dyno testingDyno rental
From $999/dayBring your own tuner and your own laptop. We supply the dyno, the operator and the data.
Dyno rentalPerformance diagnostics
$350/hrFaults that only appear under load, found under load.
DiagnosticsGroup dyno events
From $2,000Club days and shop events. Everyone gets pulls, everyone gets a sheet.
Group eventsECU unlocking is not on this list because it is not a standalone service — when a platform needs its controller unlocked before it can be calibrated, we do that as part of the tune.
490 of the 775 vehicles we support are tuned here because the RTD4 cannot reach their controllers, so the car comes to the dyno. That is a property of the car, not a policy. Every package and price is on the pricing page.
The shop
Book a session in Corona
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 — including when we are not.
DEFI Motorsports160 Vander St, Ste DCorona, CA 92878
Mon–Fri 9:00am–6:00pm
Closed Sat & Sun
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.