"Rev-Hang Reduction" - Update for 4th Gen Tacoma Manual Calibrations (by OTT)

[JustDSM]

We’re excited to announce an update for 4th Generation Tacoma manual transmission calibrations!

This update specifically targets "Rev-Hang", reducing the throttle hanging effect that many modern manual drivers find frustrating. The result is a more natural and responsive driving experience—better gear transitions, improved drivability, and that connected feel you expect from a manual.

This revision is now live and available at no additional cost to existing customers running our manual tune. If you’re already tuned and want the update, just reach out. And if you haven’t jumped in yet—now’s a great time.

Drive how you were meant to.

- OTT

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[Tacocho]

This mod is next on my list! Can you guys speak on OTT and how it affects warranty? I know on the previous gen v6s, there were no warranty issues, what about for the 4cyl turbo?

We’re excited to announce an update for 4th Generation Tacoma manual transmission calibrations!

This update specifically targets "Rev-Hang", reducing the throttle hanging effect that many modern manual drivers find frustrating. The result is a more natural and responsive driving experience—better gear transitions, improved drivability, and that connected feel you expect from a manual.

This revision is now live and available at no additional cost to existing customers running our manual tune. If you’re already tuned and want the update, just reach out. And if you haven’t jumped in yet—now’s a great time.

Drive how you were meant to.

- OTT

 

[JustDSM]

This mod is next on my list! Can you guys speak on OTT and how it affects warranty? I know on the previous gen v6s, there were no warranty issues, what about for the 4cyl turbo?

Can the manufacturer void your warrany? Sure! However. We’ve never heard of an issue in our years in business. Dealerships/Technicians don't actively look for aftermarket calibrations (we have an active Master Tech on staff to advise us of the latest policy and procedure). The field level technicians’ diagnostic tools are not able to discern the calibration changes. Certainly, assess your own risk. If I modified something and a part failed due to that, I wouldn't expect or ask Toyota to cover that under a warranty. As lovely as it would be to have zero risk and all the reward, it doesn't exist. That said, we've never seen or heard of an issue with our tuning causing powertrain failures. We work hard to vet our data, we test and validate our work in a diverse range of environments, torture test it on the dyno, and conduct in-house emissions testing with a 5 gas analyzer ensuring our files not only perform as expected on the road, deliver the broadest powerband possible for the given platform while ensuring our platforms meet reasonable basis for not increasing emissions output of the vehicle, etc. Our 3rd Gen 3.5L V6 Calibration has been awarded CARB-EO D-883 making it 50 state legal. the 4th Gen 2.4's are on deck!

When you take your truck in (tuned) here's what the dealer sees when they look at reprogramming history and warranty status. There's no need to unplug obvious devices under the hood or anything like that.

Reprogramming History: Despite over 1000 developmental flashes, no flash is recorded in Toyota's system when using our tools/methods.

Warranty Status: Still fully in-tact, even after delivering the vehicle with the tune installed, to the dealer for the Transmission Debris TSB.

Hope this helps and answers your questions

 

[Tacocho]

Thank you, this is extremely helpful.

Can the manufacturer void your warrany? Sure! However. We’ve never heard of an issue in our years in business. Dealerships/Technicians don't actively look for aftermarket calibrations (we have an active Master Tech on staff to advise us of the latest policy and procedure). The field level technicians’ diagnostic tools are not able to discern the calibration changes. Certainly, assess your own risk. If I modified something and a part failed due to that, I wouldn't expect or ask Toyota to cover that under a warranty. As lovely as it would be to have zero risk and all the reward, it doesn't exist. That said, we've never seen or heard of an issue with our tuning causing powertrain failures. We work hard to vet our data, we test and validate our work in a diverse range of environments, torture test it on the dyno, and conduct in-house emissions testing with a 5 gas analyzer ensuring our files not only perform as expected on the road, deliver the broadest powerband possible for the given platform while ensuring our platforms meet reasonable basis for not increasing emissions output of the vehicle, etc. Our 3rd Gen 3.5L V6 Calibration has been awarded CARB-EO D-883 making it 50 state legal. the 4th Gen 2.4's are on deck!

When you take your truck in (tuned) here's what the dealer sees when they look at reprogramming history and warranty status. There's no need to unplug obvious devices under the hood or anything like that.

Reprogramming History: Despite over 1000 developmental flashes, no flash is recorded in Toyota's system when using our tools/methods.

Warranty Status: Still fully in-tact, even after delivering the vehicle with the tune installed, to the dealer for the Transmission Debris TSB.

Hope this helps and answers your questions

 

[808taco]

Can the manufacturer void your warrany? Sure! However. We’ve never heard of an issue in our years in business. Dealerships/Technicians don't actively look for aftermarket calibrations (we have an active Master Tech on staff to advise us of the latest policy and procedure). The field level technicians’ diagnostic tools are not able to discern the calibration changes. Certainly, assess your own risk. If I modified something and a part failed due to that, I wouldn't expect or ask Toyota to cover that under a warranty. As lovely as it would be to have zero risk and all the reward, it doesn't exist. That said, we've never seen or heard of an issue with our tuning causing powertrain failures. We work hard to vet our data, we test and validate our work in a diverse range of environments, torture test it on the dyno, and conduct in-house emissions testing with a 5 gas analyzer ensuring our files not only perform as expected on the road, deliver the broadest powerband possible for the given platform while ensuring our platforms meet reasonable basis for not increasing emissions output of the vehicle, etc. Our 3rd Gen 3.5L V6 Calibration has been awarded CARB-EO D-883 making it 50 state legal. the 4th Gen 2.4's are on deck!

When you take your truck in (tuned) here's what the dealer sees when they look at reprogramming history and warranty status. There's no need to unplug obvious devices under the hood or anything like that.

Reprogramming History: Despite over 1000 developmental flashes, no flash is recorded in Toyota's system when using our tools/methods.

Warranty Status: Still fully in-tact, even after delivering the vehicle with the tune installed, to the dealer for the Transmission Debris TSB.

Hope this helps and answers your questions

I have a dealer in Kona Hawaii which is an OTT tune partner, specifically told me it will void warranty. You say otherwise. Im a bit confused

 

[JustDSM]

I have a dealer in Kona Hawaii which is an OTT tune partner, specifically told me it will void warranty. You say otherwise. Im a bit confused

Hey, totally fair question—and I appreciate you bringing it up.

First, just to be clear: I’m not here to provide legal advice, and everyone's situation can be different depending on how a vehicle is used, serviced, or modified. That said, here’s where we’re coming from.

There’s no denying that any modification, whether it’s a lift, larger tires, or ECU tuning, can carry some level of warranty implication. That’s true with any manufacturer—Toyota included. If a part fails because of a modification, then yes, they may deny coverage for that specific failure. But that’s not the same as saying “your entire warranty is void.”

What we’re sharing here—backed by screenshots and experience from over 20,000+ tunes in the field—is that the simple act of tuning alone does not automatically void your warranty. Nor is it something that a tech or service advisor will see flagged in the system. We even had our own tuned truck brought into an unaffiliated dealer for the Transmission Debris TSB. Not only did they perform the service without question, but the warranty record remains untouched.

As for your local dealer saying tuning will void your warranty, that’s unfortunately not uncommon. Some dealerships take a very conservative stance, often out of an abundance of caution or based on internal policy. That doesn’t necessarily mean Toyota corporate has flagged the vehicle or that your warranty is globally voided. Again, context matters.

We’re not saying there’s zero risk. Catastrophic failures can happen even on bone-stock trucks, though they’re very rare. We've never seen an issue caused by our calibrations, but we also test rigorously. Still, it’s up to each owner to evaluate their risk tolerance and make decisions they’re comfortable with.

At the end of the day, we’re just sharing data—not opinion, not speculation. We want to help clear the air in a space that’s getting increasingly crowded with misinformation and hearsay. Hope that helps clarify things a bit.

 

[DialupDavid]

Hey, totally fair question—and I appreciate you bringing it up.

First, just to be clear: I’m not here to provide legal advice, and everyone's situation can be different depending on how a vehicle is used, serviced, or modified. That said, here’s where we’re coming from.

There’s no denying that any modification, whether it’s a lift, larger tires, or ECU tuning, can carry some level of warranty implication. That’s true with any manufacturer—Toyota included. If a part fails because of a modification, then yes, they may deny coverage for that specific failure. But that’s not the same as saying “your entire warranty is void.”

What we’re sharing here—backed by screenshots and experience from over 20,000+ tunes in the field—is that the simple act of tuning alone does not automatically void your warranty. Nor is it something that a tech or service advisor will see flagged in the system. We even had our own tuned truck brought into an unaffiliated dealer for the Transmission Debris TSB. Not only did they perform the service without question, but the warranty record remains untouched.

As for your local dealer saying tuning will void your warranty, that’s unfortunately not uncommon. Some dealerships take a very conservative stance, often out of an abundance of caution or based on internal policy. That doesn’t necessarily mean Toyota corporate has flagged the vehicle or that your warranty is globally voided. Again, context matters.

We’re not saying there’s zero risk. Catastrophic failures can happen even on bone-stock trucks, though they’re very rare. We've never seen an issue caused by our calibrations, but we also test rigorously. Still, it’s up to each owner to evaluate their risk tolerance and make decisions they’re comfortable with.

At the end of the day, we’re just sharing data—not opinion, not speculation. We want to help clear the air in a space that’s getting increasingly crowded with misinformation and hearsay. Hope that helps clarify things a bit.

I really respect what you guys bring to the scene.

That said, while the re-flash may not throw a "flag" if there's no software fuses it is 100% detectable if you go down the rabbit hole and a field service engineer goes through your vehicle. Namely if you blow an Engine or Transmission, etc. Toyota is going to want to know what happened to fix in future iterations if it's too big of a question mark with high cost/safety implications. It's not possible to keep the stock checksum from the factory calibration on the ECU if you've tweaked anything in it. Every single platform update to the ECU will have a SHA-256 that Toyota can reference internally and tell it's been modified.

Dealer likely won't go down this rabbit hole, but if you do something crazy and lean out the engine at 5K miles that throws a rod through the hood they will investigate.

 

[MoCat19]

I’ve had the tune for over a month and I have an issue with it loading up around 1800-2200 rpms and blowing black smoke during this window on acceleration . It hesitates and stumbles and then wakes up at 2500rpm. I now have to drive back out to my tuner who is 90 miles away for this to be addressed.

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