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

[trailhunger]

…
Is there any potential to tune the hybrid systems on these? I would love it if eco mode would actually do something.

Eco mode seems to be expressed through the computer’s adjustments in adaptive cruise is what I’ve learned. It is marginal. Truck reaches speed limit at the blink of an eye with a soft accelerator touch

Dawn patrol 5am, almost no traffic identical drives different modes they glean some differentiation. But not much (to-date with 1,000 mi on my odometer)

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[JustDSM]

Justin, I have a couple questions for you.
I had the OTT Tune on my 2023 3rd Gen. During my ownership of it, the dealer had my Truck 2 times for service. One of those visits addressed a transmission issue. One of their steps was to validate the latest code. In my case, the Toyota dealership could not detect the OTT tune and they thought it was Toyota's latest.

Also, on my 3rd Gen, the “ECT Switch” was programmed for an additional tune. In my case, I had the default as the Mild tune. A flip of the “ECT Switch” and now the tune was Spicy.

Question 1
Can the Toyota dealership detect If a 4th Gen has been reprogrammed with OTT tune? Should I expect the same experience at the dealership as I did with my 3rd Gen?

Question 2
My 4th Gen is a limited model. The limited has 5 different drive modes from ECO, Comfort, Normal, Sport and Sport plus. Will OTT utilizes this “Drive Mode Switch” and program your tunes to these 5 switch positions?

Thanks - Mike

Mike,

Thanks for the support on the 3G! Our flashing method/protocols for the 4G will not trigger or report an RoB event, which we specifically wanted to validate. There is no "record" or stored data reporting that the ECU has been flashed, so nothing would indicate to a dealer technician that your truck has been flashed, just as it was the case with your 3G.

The drive modes are retained in our development calibration; however, they retain their original function at this time. We've focused our efforts on generating a meaningful increase in output safely as our first order of business.

How different drive modes will be remapped will have to be a conversation for a later date. I'm unable to share details on how they'll be mapped going forward. What I can say, though, is that you will certainly NOT lose their functionality. I hope that helps in the meantime!

 

[JustDSM]

The OTT tune on my Fj Cruiser made such a huge difference. Curious to hear what people think of these tunes. This applied to a hybrid will get over 500lb-ft of torque no doubt. Pretty nuts!

Is there any potential to tune the hybrid systems on these? I would love it if eco mode would actually do something.

Tyler,

Thanks so much for the support and kind words! I'm just as excited as anyone to get this out to the 4G community. I promise to keep everyone posted the moment we're ready to go live!

We still have a lot of R&D to do on the hybrid integration and controls. These are new-generation ECUs using much more complex code than the previous 3G Tacoma, so there are still a few "unknowns" at the moment. Many of those unknowns center around what exactly we'll be able to do with the hybrid system—unfortunately, more to come on this one.

 

[Baltimore]

@JustDSM

Can you post a chart showing OEM 87(r91) vs OEM 91 vs OTT 91? that'll help highlight the step change of each decision/adjustment
(Saw you posted OEM 91 over in TacomaWorld)

 

[JustDSM]

@JustDSM

Can you post a chart showing OEM 87(r91) vs OEM 91 vs OTT 91? that'll help highlight the step change of each decision/adjustment
(Saw you posted OEM 91 over in TacomaWorld)

Sure thing!

I'd like to clarify/provide some context here just to keep everyone on the same page and keep any future comparisons in perspective.

The "as delivered" run shown below (Red) was on 85 octane. Here in Utah that is "regular" grade fuel due to our elevation. Not 87 octane as most other states will use as their "regular" fuel grade.

The "premium" run (Blue) was on 91octane.

The "Beta" calibration (Green) was also on 91 Octane, with the same peak boost level as the OEM tune.

A few additional details that might be worth pointing out:

At present, we're unable to effectively "gear lock" the transmission to get full RPM sweep curves showing the full extent of changes from 2,000RPM-Redline. This makes it impossible to effectively show any TRUE gains below 3,500RPM as going "WOT" at any RPM below this will command a downshift and completely ruin your run. This means any pulls with data below 3500 (at present) should be scrutinized, as it's challenging to be consistent with part throttle pedal application from run to run. It would be VERY easy to make something look like it's delivering much more "torque" than is present - you're simply seeing the operator using a greater percentage of the available torque by variance in pedal how much pedal was applied at that specific RPM, than a true representation of the actual output delta.

We've elected to present only data that shows true back-to-back gains where the operator consistently produces repeatable results (foot to the floor).

I'd also like to reiterate that our goal for this calibration is to retain the ability to safely run 85-94 octane fuels in all environments, including towing to the vehicle's maximum rated capacity. Be mindful of this when considering tuning options for your truck. You may find many require premium fuel, or they were never properly tested in all conditions or towing.

We are.

Testing 3700lb and 6000lb payloads:

Putting the truck through the ringer:

Some data analysis: - Seperate post on this to follow.

 

[bking]

I'll be up for this as well. While you're flashing the ECU, you should add the option to change the tire size

 

[TrustButVerify]

Crazy that 85 octane nerfs the engine so badly. Very interesting.

 

[Tacocho]

Thank you! Do you guys think there will be any hinderance to long term reliability? Does Toyota just tune these trucks from the factory with overly conservative parameters?

We're in the process of evaluating the manual calibration data, but as things stand, I believe manual calibrations will have the same net gain (potentially slightly more).

We'll be sure to report on this as we dive deeper into the manual calibrations. More to follow on this. Great question!



If there is anyone in the Salt Lake City, UT area or willing to come to Salt Lake with a manual 4th Gen Tacoma - We'd love to get some data from you. OTT will provide free calibration and dyno session in exchange for your time.

 

[Baltimore]

@JustDSM

I hate to bring possible bad news, but I think your baseline is invalid. Unless you have it documented that the 85 octane met or exceed Research91 specs, your test baseline is faulty and the engine was forced to step down performance.

Per the EPA and every other source out there, even if available, 85 fuel is inappropriate for today's vehicles. Quoted below from their website for others. The rule of why 85 was made available in high altitude is not applicable anymore.

https://www.fueleconomy.gov/feg/octane.shtml
"
The sale of 85 octane fuel was originally allowed in high-elevation regions—where the barometric pressure is lower—because it was cheaper and because most carbureted engines tolerated it fairly well. This is not true for modern gasoline engines. So, unless you have an older vehicle with a carbureted engine, you should use the manufacturer-recommended fuel for your vehicle, even where 85 octane fuel is available.
"

So for the comparison to be accurate, you'd need measurement lines included for running the truck on 87(R91). But for those with regular access to 85 grade, you've shown what the performance downgrade will be!

I continue to be excited to watch your tuning performance and adjustments, but want the comparisons we are all taking decisions from to be as accurate as possible

 

[JustDSM]

@JustDSM

I hate to bring possible bad news, but I think your baseline is invalid. Unless you have it documented that the 85 octane met or exceed Research91 specs, your test baseline is faulty and the engine was forced to step down performance.

Per the EPA and every other source out there, even if available, 85 fuel is inappropriate for today's vehicles. Quoted below from their website for others. The rule of why 85 was made available in high altitude is not applicable anymore.

https://www.fueleconomy.gov/feg/octane.shtml
"
The sale of 85 octane fuel was originally allowed in high-elevation regions—where the barometric pressure is lower—because it was cheaper and because most carbureted engines tolerated it fairly well. This is not true for modern gasoline engines. So, unless you have an older vehicle with a carbureted engine, you should use the manufacturer-recommended fuel for your vehicle, even where 85 octane fuel is available.
"

So for the comparison to be accurate, you'd need measurement lines included for running the truck on 87(R91). But for those with regular access to 85 grade, you've shown what the performance downgrade will be!

I continue to be excited to watch your tuning performance and adjustments, but want the comparisons we are all taking decisions from to be as accurate as possible

The baseline we provided is how the truck was delivered. Despite the Dept. of Energy's statements there, the fact is, 85 octane is THE "Regular" grade fuel here, and it's what a significant proportion of the population uses. $ talks for most folks, and 'Regular' gets you from A-B just the same as Premium if you're just a casual driver.

It was no surprise to us that the dealer made the choice to fill it up with 85 vs other available grades. As part of our documentation process, we wanted to capture this, to show our future and potential clients that 85 octane isn't a proper choice for this engine. On our Naturally Aspirated calibrations for other Toyota platforms we service, we strongly urge folks to use 87+ despite the wide availablibility of 85 in this region. As much as we try to educate, some refuse the logical advice and run 85 anyway.

We have to be mindful of this during our development process. As people WILL run whatever fuel is cheapest even when asking a little extra from their vehicle. And this is why we feel the test is 100% valid.

You can expect future testing on other grade fuels such as 87, etc.

 

[JustDSM]

Thank you! Do you guys think there will be any hinderance to long term reliability? Does Toyota just tune these trucks from the factory with overly conservative parameters?

We embrace a tuning philosophy that enhances drivability and performance while preserving the reliability and durability that Toyota engineers meticulously design into their vehicles. Our approach is to "trim the fat," optimizing performance without compromising the foundational quality that makes these vehicles dependable.

Specializing in tailored calibrations, we meet the unique needs of everyday drivers who rely on their vehicles for daily adventures. While we have the capability for motorsports development and cater to specific clientele in various racing classes, our core focus remains on the daily driver. We prioritize creating versatile, durable setups that can handle a variety of terrains while ensuring a comfortable and reliable experience on the road.

Please excuse the reference to another forum, but I feel this post by our client encapsulates what we're about and how we approach our calibrations. (https://www.tacomaworld.com/threads/psssst-what-mileage-you-at.840735/page-5#post-30101552)

I think you'll see that as tuning for this platform becomes more popular, there will be a "horsepower war." While some will be after that, that's not our core/target audience.

 

[tacomuncher]

Following!

 

[HardCorTaco]

I’m really excited about this tune! I’d like to be one the of first to get it and feature it on my YouTube channel again.

I did a video with my 3rd Gen and loved it. Let me know if you need another 4th gen, I’m in the SLC area.

 

[Tacocho]

Thanks for the insight! I’m definitely interested. Last question, did you guys raise the boost pressure to increase power, or are the power gains just from adjustments for premium fuel?

We embrace a tuning philosophy that enhances drivability and performance while preserving the reliability and durability that Toyota engineers meticulously design into their vehicles. Our approach is to "trim the fat," optimizing performance without compromising the foundational quality that makes these vehicles dependable.

Specializing in tailored calibrations, we meet the unique needs of everyday drivers who rely on their vehicles for daily adventures. While we have the capability for motorsports development and cater to specific clientele in various racing classes, our core focus remains on the daily driver. We prioritize creating versatile, durable setups that can handle a variety of terrains while ensuring a comfortable and reliable experience on the road.

Please excuse the reference to another forum, but I feel this post by our client encapsulates what we're about and how we approach our calibrations. (https://www.tacomaworld.com/threads/psssst-what-mileage-you-at.840735/page-5#post-30101552)

I think you'll see that as tuning for this platform becomes more popular, there will be a "horsepower war." While some will be after that, that's not our core/target audience.

 

[JustDSM]

I’m really excited about this tune! I’d like to be one the of first to get it and feature it on my YouTube channel again.

I did a video with my 3rd Gen and loved it. Let me know if you need another 4th gen, I’m in the SLC area.

Please send me a PM with your contact information. We can discuss further details off-line.

Thanks for the insight! I’m definitely interested. Last question, did you guys raise the boost pressure to increase power, or are the power gains just from adjustments for premium fuel?

Peak boost pressure was functionally identical. Part of our tuning is eliminating the boost taper in the stock calibration, allowing the truck to maintain the stock boost pressure to redline.

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