FAQ
Frequently Asked Questions
Questions about the OTT tune? Reach out anytime at info@appalachiantoyotatuning.com.
How does the tuning process work?
Before booking, you'll agree to a liability waiver in the terms. When you arrive, we connect your battery to a stable power source for the ECU flash, plug into the OBDII port, and check whether an ECU update is required. If so, we update it (free), then flash the tune. After a few minutes of idling, you take a short drive to feel the throttle response — and we adjust it more or less aggressive to taste. Plan on about 30 minutes in most cases.
Does my ECU software need updating (Toyota TSB)?
We verify your truck's software version and update it for free if required.
Can the dealer detect my tune?
Our ECU flashes don't modify the OEM ID, so it always reports as "stock" when the dealer reads your software version. We don't guarantee warranty status, but many customers have had warranty work handled without issue. Treat tuning like any other aftermarket modification.
Can you calibrate my speedometer?
No — check aftermarket options like Rough Country or HyperTech.
Will this void my warranty?
If a warranty issue is caused directly by the tune, that item could potentially be voided. These tunes are 99.9% undetectable by the dealership, and many customers have had no warranty problems. We make no guarantees — use your best discretion. See the Magnuson-Moss Warranty Act for your rights regarding aftermarket modifications.
What improvements can I expect?
- Improved performance
- Smoother shift points & reduced gear hunting
- Reduced lag
- Linear power curve
- …and more
Can I go back to the stock tune?
Yes. We can reflash the stock calibration and return your vehicle to stock anytime you like.
Will my MPG be affected?
Every truck and driver is different, so we can't make MPG claims. Drive normally and keep up routine maintenance and you may see gains; most customers see roughly net-zero. If you only want a tune for MPG, this isn't the right reason to tune.
What fuel does the tune require?
- Naturally aspirated: 87+ octane
- NOT designed for 85 octane
- Supercharged: 91+ octane required
- E85 not currently supported
- Ethanol-free fuel is fine