Overland Tailor Tuning (OTT) - 4G (2024+) Tacoma Development

[JustDSM]

Would love to see comparison against actually stock OEM specs - aka 87 octane.
Anything more or less is a forced aftermarket adjustment distorting the picture.

Bring us a truck running the fuel you want tested and we’ll provide the testing free of charge.

This was a vehicle supplied to us. We can’t (always) control what fuel is used.

It should also be noted that this isn’t a “special” tune for 91 octane or premium fuel in general. Our Stage 1 calibration is designed to run regular to premium. What’s presented here is simply a data point.

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[bigd9247]

Would love to see comparison against actually stock OEM specs - aka 87 octane.
Anything more or less is a forced aftermarket adjustment distorting the picture.

I don't want to derail this thread, but I think it's likely that Toyota's published horsepower and torque numbers were obtained with premium fuel. I think @JustDSM has already posted a dyno chart showing a decent jump in power just from premium fuel alone (before any tuning). Yes, the truck can run on regular 87 octane, but it also detunes itself for the lower octane. Forced induction engines like higher octane.

 

[Baltimore]

Bring us a truck running the fuel you want tested and we’ll provide the testing free of charge.

This was a vehicle supplied to us. We can’t (always) control what fuel is used.

It should also be noted that this isn’t a “special” tune for 91 octane or premium fuel in general. Our Stage 1 calibration is designed to run regular to premium. What’s presented here is simply a data point.

Thank you for providing this clarity that the tune isn't forcing/necessitating a different fuel grade.

I'd happily coordinate to swing through if I wasn't a few thousand miles from your shop. If it was in the greater Baltimore area, I'd offer coordinating for the access to a LTD HV.

Please don't get any message wrong, appreciate your dedication to the mission of capitalizing on a design and seeking safe, sustainable improvements!

 

[HardCorTaco]

I just want to say from my perspective that the folks at OTT are really doing their research and testing to offer something great for the new Tacoma. I've been on the stage 1 tune now for over a month and it's fantastic! Here is the video covering the dyno numbers for the hybrid.

 

[fitsofrage88]

Bring us a truck running the fuel you want tested and we’ll provide the testing free of charge.

This was a vehicle supplied to us. We can’t (always) control what fuel is used.

It should also be noted that this isn’t a “special” tune for 91 octane or premium fuel in general. Our Stage 1 calibration is designed to run regular to premium. What’s presented here is simply a data point.

Checking in to see how the stage 2 was coming along?

 

[JustDSM]

OTT Stage 2 Development Update


Here's where we presently stand on Stage 2 development and what that means for the community. While we're deep in the process, we also want to manage expectations and give you a look behind the curtain.

From the outset, this was our calibration path for the 4th Gen Tacoma:

• OE Spec – Designed for SR-trim vehicles to bring them up to full factory-rated output.
• Stage 0 – A complete engine/transmission calibration with a modest boost bump (approx. +2–3 psi over OE), faster spool, and rev-hang reduction for manuals. Compatible with all fuel grades from 87–93+ Octane.
• Stage 1 – Builds on Stage 0 with an additional +2–2.5 psi of boost.
• Stage 2 – Initially envisioned as a premium fuel-only, high-effort performance calibration designed to pair with bolt-on upgrades and extract the maximum potential from the stock turbocharger.

Since the March 1st launch of OE Spec and Stage 1, we’ve been working to enhance those initial calibrations while simultaneously pushing forward on Stage 2 development. Much of this effort has been behind the scenes, resolving early-release details and beginning deep validation of what we originally envisioned for Stage 2.

We’ve partnered with several hard-part manufacturers and have been independently testing individual components to determine what actually contributes meaningful performance gains. It's our goal is to make sure anything we require for Stage 2 contributes to package. We’re also continuing to evaluate additional parts we’re waiting on, and new partnerships are being formed to help broaden the scope of testing.

Our development vehicle has been further instrumented to monitor critical parameters, allowing us to assess how hard we're pushing the platform, how much headroom we really have, and whether long-term reliability is being preserved. While the dyno is an important tool in this process, we place far more emphasis on data analysis and system behavior to ensure the full calibration package works cohesively and durably. Power is great, but it needs to be repeatable, reliable, and consistent for the long haul.

Through this testing, it's become clear that Stage 2 may not take the exact form we initially had in mind. The stock turbo is clearly engineered for responsiveness and low-end torque delivery, which can be seen as an intentional design choice from Toyota to improve driveability over the previous generation. However, that design priority comes with tradeoffs, particularly on the turbine side, where the turbo quickly becomes a limiting factor when attempting to push beyond the Stage 1 output.

We're finding that while there is still performance to be had, the margin beyond Stage 1 isn't dramatic. The safe and reliable limits of the stock turbo appear to be within reach already under our Stage 1 calibration, which makes pushing further a question of diminishing returns. Gains are there, but they’re incremental. So if Stage 1 already left you wanting significantly more, Stage 2 may not deliver the kind of leap forward you're expecting.

So, what are the next steps? We're still awaiting a few additional components to complete testing, and some new partnerships are forming as well. We’re committed to giving those partners the space to properly design and develop quality solutions—we’re not rushing this just to check a box.

Rest assured, Stage 2 is still coming, but with a more nuanced purpose: to offer the best possible calibration when paired with proven, effective bolt-ons, without compromising reliability.

For those chasing significant performance beyond Stage 1, Stage 3 will be where it's at.

We're currently in the T&E phase with a bolt-on turbo upgrade that retains the OE housing for a 100% stock appearance but offers meaningful performance gains where the factory turbo falls short. Early indicators show promising potential with minimal impact on response and the quick spool nature of the OE turbo. We expect to have a prototype in hand very soon.

We appreciate your patience and support as we continue refining the 4th Gen Tacoma platform. Every update is done with intention—and built on data, not guesses.

Best,
Justin

PS: Sorry for the long winded nature of the update! Want to make sure you guys have all the details.

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