Engineered tuning.
In-house hub dyno.
Custom tuning at DEFI or anywhere in the country · Corona, California
Search anything — your car, parts, services
Just want it measured? Dyno testing, $350Compare packages
- All-in pricing — no second invoice
- Pump gas and E85 maps in every tune
- Every session leaves with the full sheet
- All major cards accepted
The dyno · 160 Vander St, Ste D, Corona
The latest in dyno technology, and why that changes the number
3,400
hp of absorption
Most shops in this region run rollers. A roller measures power after it has passed through the tire, so compound, pressure, temperature and strap tension all move the reading — change nothing about the car, run it again next month, get a different answer.
The wheels come off here. The dyno bolts straight to the hubs, which takes tire slip and roller losses out of the measurement entirely. That is the only thing that makes a before-and-after worth comparing — and it is why we are comfortable publishing all of it.
On the Mainline ProHub · published, not claimed
Nothing cropped out.
One C8 Corvette Stingray, one session, three calibrations — stock, then pump gas, then E85. Overlaid in the dyno's own software with the correction standard printed across the top of the window.
We are not asking you to take the number on trust. We are showing you the window it came out of.
- 1BaselineStock calibration427.9hp @ 6170 rpm
- 291 octanePump gasoline tune449.6hp @ 6261 rpm
- 3E85Ethanol calibration474.7hp @ 6219 rpm
Corrected to SAE J607, 15°C · 1013 mBar. +21.7 hp on pump gasoline, +46.8 hp on E85, 427.9 → 474.7 hp.
New result2023 Chevrolet Corvette C8 Stingray, Magnuson supercharged537.1 → 579.0 hp peak, and the gap that matters: +120 whp at 6,500 rpm over the kit calibration.
Baseline, 91 octane and E85 on one set of axes — the overlay exactly as it appears on the dyno.
Read off the screen
474.7 hp
443.6 lb-ft · 6219 / 4731 rpm
C8 Corvette Stingray — E85 calibration
Read off the screen
464.2 hp
432.6 lb-ft · 6216 / 4729 rpm
C8 Corvette Stingray — Second car, same cell
Watch it happen
From the stock pull to the tuned pull
Unlocking, flashing, fuel and the dyno — filmed in the shop in Corona. Each video is on the page for the vehicle it shows.
How a C8 Z06 gets tuned, step by step
0:25 · captions, no sound
The four steps of a C8 Corvette Z06 E85 tune at DEFI Motorsports: the ECU is unlocked, the calibration is flashed with an RTD interface, the tank is filled with E85, and the car is pulled on the Mainline ProHub hub dyno in Corona, California.
Watch page →C8 Z06 E85 tune: stock pull to tuned pull
0:34 · sound on
A C8 Corvette Z06 at DEFI Motorsports in Corona, California: the stock pull on the Mainline ProHub hub dyno, the calibration being written, and the pull on our E85 tune — then Darius on how the same calibration ships to you on an RTD interface.
Watch page →2018 Silverado 5.3 E85 tune on the dyno
0:23 · captions, no sound
A 2018 Chevrolet Silverado 5.3L on the Mainline ProHub hub dyno at DEFI Motorsports: the baseline pull at 248.9 whp, the E85 calibration flashed with an RTD interface, and the tuned pull at 319.8 whp.
Watch page →
From the shop
Pulls, builds and results as they happen — usually the same afternoon they come off the hubs.
Packages
Measure it. Tune it. Stay connected to it.
Every price is built from three figures: DEFI Custom Tuning $500, a Mainline dyno session $350, and the DEFI RTD4 $350 that every calibration arrives on. Licensing is quoted per vehicle.
Dyno Performance Test
$350
- Mainline dyno session$350
Horsepower and torque measurement, a baseline before a build, or proof of what a part or a previous tune actually did.
Book dyno testingCustom Dyno Tune
$850+ licensing
- DEFI Custom Tuning$500
- Mainline dyno session$350
Standalone ECUs, and vehicles the RTD4 cannot connect to — tuned on the hubs and flashed with our own interface.
Book dyno tuningRemote Tune Package
$850+ licensing
- DEFI Custom Tuning$500
- DEFI RTD4 interface$350
Anywhere in the country. The RTD4 ships to you and the vehicle never leaves your driveway.
Start a remote tuneComplete Tuning Package
$1,200+ licensing
- DEFI Custom Tuning$500
- Mainline dyno session$350
- DEFI RTD4 interface$350
Tuned on our dyno, and you leave with the RTD4 — so every later revision reaches the car without another visit. How every factory ECU the RTD4 supports is tuned in the shop.
Book dyno tuningSupercharged and halo platforms — C8 Z06, ZR1, E-Ray, Hellcat, Demon, Trackhawk, TRX, GT500, Escalade V, Blackwing, GT-R and Raptor — take $900 of DEFI Custom Tuning instead of $500. A locked ECU or TCM adds its air return from HP Tuners, once per order: $100 2-day or $140 next-day.
Why the RTD4 is in every tune: the calibration travels to it encrypted and is written to the ECU locked, so it cannot be read back off the car and copied — and it is how every revision reaches you afterwards. What the RTD4 does
What a cheaper quote leaves out
A calibration is one of four things a modern vehicle needs before it will run a tune at all. Most quotes cover the one and leave you to discover the other three.
DEFI · all-in
Chevrolet Corvette C8 Z06
$3,250
- ECM unlock service
- Interface hardware
- License credits
- The calibration itself
- Revisions after delivery
Nothing else to buy. It arrives working.
A file-only tune
Chevrolet Corvette C8 Z06
~$1,050
- ECM unlock serviceThe controller is locked from the factory. Nothing can be written to it until this is done — by us, by them, or by anyone.
- Interface hardwareThe device that carries the calibration to the car and stays with you for revisions.
- License creditsConsumed permanently against your ECM when the tune is applied.
- The calibration itself
- Revisions after deliveryPriced per shop. Worth asking before you buy rather than after.
You will still owe the unlock and the hardware before it runs.
Both columns are the same car — a Chevrolet Corvette C8 Z06, priced August 2026. Comparing our cheapest platform against someone else's most expensive one would prove nothing.
A thousand dollars is a fair price for a calibration file, and plenty of good tuners charge it. It is simply not a price for a running car — the unlock and the interface are not optional extras, they are what makes the file usable at all. We quote the whole job because a quote you have to add to is not a quote.
Vehicles we tune
Not a list of everything the software supports. Some of these cannot be shipped a tune at all — that is a property of the car, and the card says so.
Chevrolet
Ships or in-shopCorvette C8 Z06
2023–2026 · from $3,250
BMW
In-shopM4
Dyno-tuned in our Corona shop
Nissan
In-shopSkyline R32
Dyno-tuned in our Corona shop
Coverage
4calibrations
on file
Engines
- 6.2
Dodge
Ships or in-shopChallenger SRT / Hellcat
2015–2024 · from $1,689
Coverage
13calibrations
on file
Engines
- 2.3
- 3.7
- 4.0
- 4.6
- 5.0
- 5.4
Ford
Ships or in-shopMustang
1996–2026 · from $900
Coverage
28calibrations
on file
Engines
- 2.7
- 3.5
- 3.7
- 4.6
- 5.0
- 5.2
Ford
Ships or in-shopF-150
1997–2026 · from $900
Shop by manufacturer
29 makes, 179 platforms
Figures are vehicles that ship. 219 more are supported as in-shop work only — the vehicle page says which, before you pay rather than after.
Find your vehicle
427 vehicles · prices are all-in · it says no when the answer is no
427 vehicles, most-requested first · 208 ship · 219 in-shop
- 2023–2026Chevrolet Corvette C8 Z06 5.5 (LT6)$3,250
- 2020–2026Chevrolet Corvette C8 Stingray 6.2 (LT2)$2,750
- 2023–2026Chevrolet Corvette C8 ZR1 5.5 TT (LT7)$3,250
- 2024–2026Chevrolet Silverado 2500/3500 6.6 (L8T)$1,650
- 2022.5–2026Chevrolet Silverado 1500 5.3, 6.2$1,750
- 2021.5Chevrolet Silverado 1500 5.3$1,450
In the shop · Corona, CA
Dyno services
Book online or call. Every session ends with the full sheet — every run on it, not just the good one.
Dyno tuning
From $850 + licensingCalibration developed under load on a hub dyno, with the conditions published on every sheet you leave with.
Dyno tuning in CoronaDyno testing
$350/hrFind out what the car actually makes — not what the box, the forum or the last shop said — under conditions we publish.
Dyno testingEngine break-in
$350/hrA fresh engine brought up exactly the way you, your engine builder or the parts maker asks — on the hubs, not in traffic.
Engine break-in on the dynoDyno rental
From $999/dayBring your own tuner and your own laptop. We supply the dyno, the operator and the data.
Dyno rentalDiagnostics
$285A flat $285. We plug in, find out what is actually wrong, and show you the data that proves it — before anybody spends money on a dyno session or a retune.
Performance diagnosticsGroup events
From $2,000Club days and shop events. Everyone gets pulls, everyone gets a sheet.
Group dyno eventsStandalone engine management
Any standalone ECU. Wired, started and tuned here.
Old or new, wire-in or plug-in. We build the harness, commission the car, and calibrate it on the hubs.
The DEFI shop · ships nationwide
Shop hardware, straps and apparel
The interface your calibration is licensed to, the ratchet straps we tie cars down with, and the shirt. Ordinary objects, described honestly.
RTD interface
Ships with every national tune
View
Tie-down straps
From $35
The kit we tie cars down with in transit
View
T-shirts & hoodies
From $25
Eight colourways, S to 2XL, free shipping
View
Keychain
$15
Machined, not printed
ViewPrices are live. Sizes, colorways and strap ratings are not published yet — and under a no-returns policy nobody is being asked to guess a size, so these go on sale once those arrive.
Corona, California
Drive in, or ship in. The engineering is the same either way.
Everyone else tells you what you want to hear
Power is bought, not found. More cylinder pressure means more heat and more stress on parts specified for the factory number. Economy falls. A tuned car will not pass smog in this state. None of that is a secret in this trade — it is simply not mentioned until after the invoice.
We say it first, in writing, before you pay. We will tell you which trade you are making, we will tell you when a part was a poor choice even though we did not sell it to you, and we will turn the job down when the combination will not carry what you are asking for.
That is the actual product. The horsepower is just what comes out of the end of it.
Before you book
A two-minute phone call settles most of it — whether your ECM is locked, whether your platform can ship, whether the combination supports what you are asking for. We would rather tell you no on the phone than take the booking and find out on the hubs.
DEFI Motorsports160 Vander St, Ste DCorona, CA 92878Mon–Fri 9:00am–6:00pm · Closed Sat & Sun
- Can you tune my car remotely?
- 208 of the 427 vehicles we support can, on a DEFI RTD4 that ships to you and stays yours. The rest are tuned on our dyno because the RTD4 cannot reach them — the vehicle page says which before you pay.
- Check your vehicle
- What does a dyno session cost?
- Dyno testing is $350. A Custom Dyno Tune is $850 + licensing, and a factory ECU the RTD4 supports is tuned as the Complete Tuning Package: $1,200 + licensing, RTD4 included. Additional time is $350/hr and we tell you before the clock starts, not after.
- All packages and prices
- Will it still pass smog?
- No. A tuned vehicle is not smog-legal in California and we are not going to imply otherwise. Added power also costs longevity and fuel economy — which trade you are making is a conversation we have before you pay.
- The answers that cost us sales
Not ready to buy? Tell us what you drive.
You will get the fitment answer, the real all-in price, and the last dyno sheet we published for that platform. One email, written by a person.
Asking a question is not signing up for anything — this form subscribes you to nothing, and we do not sell your address. If the answer is that we cannot help, the email will say that instead.
Corona, or your door.
Cars, trucks, UTVs and side-by-sides. In-shop from Riverside to San Diego — engineered calibration to all fifty states.