In Depth Review Videos + Official Release Info: Overland Tailor Tuning OTT Tune for 4th Gen Tacoma

It's not even a responsibility to reflash to stock. It's the responsibility that came with assuming risk.

Wanna change the parameters of your drivetrain? Cool.

Wanna hide what you did and pretend it's Toyota's responsibility? Not cool.

 

Yeah. Sound argument. You’re right.

 

This is spot on. As the consumer we need to take responsibility to the modifications we make. I have made changes to every vehicle I have owned to suit my tastes. Some have worked very well; others I have had problems with. This is the gamble I am willing to take to feel like I am improving my ride. I am always thankful for the people who are smarter than I am to come with improvements I can either purchase or copy

 

I'm here with this, too. If you run a different tune, you're operating the engine outside the parameters prescribed by Toyota for the drivetrain. It would not be inaccurate to call this "abuse" from their perspective. It's not unreasonable for them to deny warranty coverage on a related part if you experience a failure. It's disingenuous at best to put the factory tune back on after you break it using an aftermarket tune; you're covering up what's essentially a wrongdoing.

Personally, I'm of the opinion that running aftermarket parts on a vehicle that's still under warranty is asking for a headache if you expect that warranty to be worth anything to you. Leave it stock and modify it once the contract expires.

 

Toyota has a "tune" for the Tundra that bumps HP by 8% and brings peak Tq down 400rpm. You have to run 91 octane after the tune. That's with an intake and exhaust. Typically TRD exhausts don't add a lot and I doubt the CAI is making the 32hp gain by itself. If Toyota feels comfortable bumping their engines up 8% with a tune and keeping them in warranty, a tune that adds 11% is probably safe.

For reference, the 3.4T is putting out 114hp and 141tq per liter and the 2.5T is at 111hp/L and 127tq/L. Definitely not taxing that engine very hard.

The Tacoma sells a lot more than the Tundra so they should have a larger R&D budget to develop stuff like this. Especially since the 4R and LC have the same motor. The volume of 2.5Ts dwarfs the 3.4T.

I'd wait for a TRD solution but I don't think a mild aftermarket tune is going to shorten your 2.5T life span.

 

Totally off topic. I am digging your profile pic. These bad boys were mainstay my first couple of years in the Army. I loved having them fly over our convoys of Abrams tanks keeping us secure.

 

You're dating yourself (and me). The AH-1W is a steam gauge dinosaur now.

 

Lol yes I am.

 

2.5T? You mean the 2.4T? Heck, it's 2393cc's, so even calling it a 2.4L is a bit generous.

 

Yeah, I got my 4s and 5s mixed up. The Toyota used to say the Tundra had a 3.5 that is actually 3,445cc, but now they're calling it a 3.4?

 

Are you giving the manual the same full torque curve as the automatics?

 

Anyone interested should get on their local Overland Tailor Tuning OTTs radar. Find your local tuner below!

https://www.google.com/maps/d/u/0/v...&ll=39.34546245409447,-101.24182538634021&z=3

 

Especially those with Hybrids

 

2024 Tacoma Hybrid Tune Results <- Click Here

 

Part 2 Video! 4th Gen Hybrid hits the dyno. For those of you waiting on the next gen tunes, the wait will be worth it. Overland Tailor Tuning OTT - Tried, True, Tested! Be sure to follow OTT on FB and Insta for all the latest!

https://youtu.be/5VqZQx0YPBE

 

Same dyno but big difference in drivetrain losses. The Hybrid losing 10-11% sounds about right but the non-hybrid losing 0 HP and gaining 8% Tq?

 

We share what we find.

It should be noted that while the data collected from the Hybrid would suggest the baseline and tune were done on 91 octane (as was our gas baseline), we cannot confirm it was, in fact, on 91 octane. The hybrid truck had 1/2 of unknown fuel in it on arrival and we topped it off with 91.

 

I found myself wondering if this would also eliminate the cabin vibrations that some of us are getting in the 37-47mph window when easy on the accelerator.
Happens in all drive modes, but if this alerts shift point decisions... HRM

I don't think anyone has narrowed down if it's hybrid s non hybrids or specific OEM tires, etc.

 

Someone check my maths, but here is what I came up with based on the video above. Weights are for an OR with 5' bed.




@JustDSM Could you please address a few questions listed below when you have a minute? Thanks for your time.

1. Will OTT be releasing a handheld unit at any point in the future similar to an Accessport from COBB? I had one back in the day for a WRX and it was nice to have the ability to tweak minor settings and view additional live data. I would be willing to pay a premium to get one in addition to the tune.
   
2. Is the OTT tune, when flashed by a certified local installer, simply an off the shelf flash, or do local shops tweak each tune for the specific truck they are flashing? This kind of goes with question 1; if they are off the shelf, it would be nice to flash at home with a handheld unit.
3. Whether the OTT tune is off the shelf or customized per vehicle by local installers, do you continue working on the tunes after they are released and provide updates down the road? For example, if I was to get the hybrid tune from RCTuningFL tomorrow as lets say revision 1.0, will there every be a revision 2.0 and would I be entitled to that update free of charge, or would there be a small fee or full fee associated with the revision?

 

I appreciate you taking the time to ask!

1. We are working on a potential handheld/flash-by-phone solution, which would allow users to flash their vehicles at home and provide live data monitoring and additional functionality. However, at initial launch, this capability will not be available as it is still in development. Our primary goal is to ensure that any solution we offer meets our high standards for reliability and compatibility with Toyota's ECU architecture. In the meantime, shortly after launch we will offer a DIY Package, which includes the necessary hardware, software, vehicle-specific licensing, and calibration files. This will allow you to flash your vehicle from home with a windows based laptop. This will have a full datalogging suite available as well. As development of handheld/phone app solutions progresses, we will keep our customers updated on those findings.
   
   
2. At launch, our available calibrations will be “off-the-shelf” (OTS) files tailored for specific vehicle configurations. While not custom-built per individual request (future Staged calibrations will offer this), we provide multiple variations to best match your needs; it's not a one-size-fits-all approach. Your OTT retailer will assist in selecting the most appropriate calibration for your specific setup. All calibration development is handled exclusively by OTT. This ensures that every tune we provide meets our strict performance and reliability standards. Local shops do not modify the tunes themselves, as we want to maintain the integrity and thorough testing that goes into each calibration.
   
   As mentioned in response to your first question, we are working on at-home flashing solutions, but until those are finalized, the DIY Package will allow you to flash at home using our defined calibrations.
   
   
3. We are 100% committed to ongoing development and support for all our calibrations. Our work does not stop once a tune is released, as we are constantly evaluating, testing, and refining our calibrations. If and when software advancements allow for meaningful improvements, we will implement those updates—even on older platforms. For example, when improvements are found, we still provide updates and support for vehicles as old as the 2003 GX470.
   
   Regarding your specific question on updates, the answer is yes—if you purchase a tune from OTT and a future revision improves upon that calibration, you will receive that update free of charge. If your vehicle ever requires a factory ECU update from Toyota, we maintain detailed records and can reapply your OTT calibration at no cost with proof of purchase.
   
   I'd like to point out the obvious and state that the new generation Toyota ECUs (Gen4 Denso) found in the latest Tacoma, Tundra, 4Runner, etc. are still undergoing extensive R&D, and we anticipate further breakthroughs that will enhance our offerings over time. The tunes available at launch represent the absolute latest and best calibration data available. Rest assured, we will continue improving upon them, and customers will benefit from those improvements as they are rolled out with their free updates.