Introducing the 2024+ Tacoma ECU/TCU Tuning Solutions from Overland Tailor Tuning (OTT)

[JustDSM]

I can say that Volkswagen Audi group/dealers plugs into the ECU during an oil change…. And they could flag a “TD1” code for a modified engine/software.. even on a stock software flash, the Siemens ECU would record torque output, and even if the software was flashed back to stock, the torque log would notify VAG of the “power output increase” … can the Toyota dealer or Toyota corporate detect a software change? I ask because I am under warranty, but also desire to bump up the power output…
Also, I have noticed that the turbo boost isn’t introduced much, until 3rd gear and higher… does your software recruit the boost in lower gears? I live on a hill and…. I would like to know if your software change would require me to idle the engine longer, after pulling into my driveway.

In a reply to another poster, I'll touch on the "what dealers can see/what's recorded in a follow-up post after this. However, I will say that what the dealer/corporate can see is quite different from what other manufacturers and ECUs report.

Re: your question about boost in the lower gears. We can get more boost out of 1st and 2nd gear. However, I'll say that 1st gear is still "restricted" a bit. We were okay with that for the general release of Stage 1 to protect drivetrain components. However, we are in the process of figuring out the load/torque limiting that's in place there to allow full output in 1st-8th. We're pretty close to having that licked.

You don't need to drive or do anything different in idling/warm-up/cool-down than you would have in stock form. Shutting down the motor immediately after a hard/long pull under sustained high boost (thermal loads) isn't good. Day-to-day and spirited driving will not require anything special on your part.

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[JustDSM]

This makes a lot of sense for the OEMs. You do not need to actually detect the code just look for parameters that are out of spec of the factory numbers.

For me, it's a safe bet that Toyota can detect a tune in some capacity. It's no secret that it's happening. I wouldn't be surprised if they had some company vehicles tuned just to see what changes are being made.

What is your source for this claim? Or is it purely speculation?

I can say with certainty that dealers and technicians do not actively check for tunes during service. We have dealer-level access to Toyota’s systems and databases, as well as a Toyota Master Technician on staff who provides insider knowledge on procedures and policies.

During development, we closely monitored these systems and even took our tuned development vehicle to an unaffiliated dealer for a transmission inspection under the "transmission debris" TSB. They followed standard diagnostic procedures using Global TechStream, and despite over 1,000 flashes on our vehicle, Toyota's system reported none. The warranty remains fully intact, as shown here:

 

[JustDSM]

Have you witnessed or will stage 1 tune have the potential to make the truck go into limp mode ?

A truck running OTT Stage 1 should not enter limp mode due to the calibration itself. However, a limp mode condition can still be triggered by underlying mechanical issues such as a component failure, boost leak/vacuum leak, etc.

 

[WKTJR1]

What is your source for this claim? Or is it purely speculation?

I can say with certainty that dealers and technicians do not actively check for tunes during service. We have dealer-level access to Toyota’s systems and databases, as well as a Toyota Master Technician on staff who provides insider knowledge on procedures and policies.

During development, we closely monitored these systems and even took our tuned development vehicle to an unaffiliated dealer for a transmission inspection under the "transmission debris" TSB. They followed standard diagnostic procedures using Global TechStream, and despite over 1,000 flashes on our vehicle, Toyota's system reported none. The warranty remains fully intact, as shown here:

Not trying to start a debate, purely speculation on my part. But this is good info to know for clients.

 

[JustDSM]

Not trying to start a debate, purely speculation on my part. But this is good info to know for clients.

Noted! Thanks

If you have any specific questions regarding this, I'll share what I can!

 

[Duce95]

Great question!

With the 4G Tacoma, we’ve revised the tuning approach due to the ECU’s completely different control strategy. Unlike the 3G Tacoma, which used direct throttle angle targets, the 4G Tacoma (along with the 6G 4Runner, etc.) employs a torque-request-based throttle control strategy.

To adapt to this, we’ve implemented a new throttle control method and updated our naming conventions accordingly. Our current throttle settings are:

• Stock – Retains 100% OEM throttle control/sensitivity.
• Base – A slight increase in throttle response/sensitivity.
• Enhanced – A moderate boost in throttle response/sensitivity.

Note: Drive mode-specific adjustments are made independently based on each mode’s intended use.

As for tuning, Stage 1 is our standard performance option, offering higher output compared to Stage 0 and OE Spec.

• Stage 0: Identical to Stage 1 but with a lower boost target (available on request).
• OE Spec: Designed for SR trim and manual trucks, unlocking their full OEM potential—bringing them up to 278 hp / 317 lb-ft.

Both Stage 0 and Stage 1 are full engine and transmission calibrations, enhancing turbo spool, response, and overall drivability. Meanwhile, OE Spec retains stock calibration but removes factory detuning, restoring the original full-output OEM code.

Let me know if you need further clarification!

God all set up yesterday from Wayne over at copper State. Truck feels great. Pressing the tow/haul button is like race mode now.

 

[JR760]

The tune is amazing. If you got a 4th gen. Get it.

 

[JustDSM]

God all set up yesterday from Wayne over at copper State. Truck feels great. Pressing the tow/haul button is like race mode now.

The tune is amazing. If you got a 4th gen. Get it.

Thank you both for the support! Love hearing you guys are enjoying the tune!

 

[JR760]

No worries, definitely enjoying!!! Do you know if the turbo is upgradable?

 

[Devildog81]

The tune is amazing. If you got a 4th gen. Get it.

How big of a power difference did you notice? And how’s the transmission shifting vs stock?

 

[JustDSM]

No worries, definitely enjoying!!! Do you know if the turbo is upgradable?

We're working on an upgraded unit

 

[Devildog81]

We're working on an upgraded unit

Have you guy’s had a stock one apart? I’ve been curious to find out how many mm the stock turbos compressor and exhaust wheel is?

 

[JustDSM]

Have you guy’s had a stock one apart? I’ve been curious to find out how many mm the stock turbos compressor and exhaust wheel is?

We'll be able to share those details shortly ;)

 

[GMak621]

God all set up yesterday from Wayne over at copper State. Truck feels great. Pressing the tow/haul button is like race mode now.

The tune is amazing. If you got a 4th gen. Get it.

Getting mine tuned next weekend.

How is the tune treating y’all?

 

[Duce95]

Getting mine tuned next weekend.

How is the tune treating y’all?

Feeling is starting to settle down as I get used to it. Has the power if I need it. Still showing similar mpg on 87 octane. Currently averaging by computer at 17.8 mpg. Normally around 17.9 for the last year. On 33’s with methods. Good trade off for extra power if needed.
Looking forward to stage 2 updates @JustDSM

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