Introducing the 2025+ 4Runner ECU/TCU Tuning Solutions from Overland Tailor Tuning (OTT)

Simulated data is an indicator, not proof. This is because simulations like that have quite a few assumptions, that may not be true, baked in. You are probably right, but I have seen many cases of theorycraft to fall flat in practice to consider it definitive.

 

The above isn’t “simulation” data. You like to argue I gather.

 

first mover advantage.

Also.....I'm super happy people are working on this now so when other people like me get one or something with the same engine all the work has been done and it's ready to flash the day I get the new truck.

 

You know the dyno knows the speed during the runs, right?

It’s ok to be wrong. Reviewing objective evidence and data is how we all learn.

 

As I never heard of them, so I did finally look up OTT, they would have this data. Because of how curves looked like, I assumed this tune was untested product by a lone operator and took everything the OP said with a lot of skepticism. Maybe it wasn't warranted in this case.

Also, my preconceived motion that 6th gen engine is a turd, played into this as well... not that stock curves convinced me otherwise on that point.

 

So you’re saying that under normal driving conditions from 1000 to 2500 RPM the 4.0 is actually better.

 

Only when you’re transitioning from part throttle to WOT in those RPMs.

On the road in actual part throttle transitions the turbo response is nearly instantaneous. There is a “split second” advantage naturally aspirated engine has, but in less than probably 1/2 seconds time a small, modest part throttle input on the new engine will deliver far more torque than even the 5.7L V8 in a Tundra can deliver.

Guys, the 1GR-FE is one of my personal favorite engines, but the new T24A-FTS outperforms all prior generation motors in virtually every metric. The ones it hasn’t, just require time for it to earn its stripes.

It’s finally brought the wildly popular Tacoma and 4Runner nameplates up to modern standards with regards to power train performance.

 

Just go watch youtube reviews and reactions to acceleration and highway driving. The 4 cylinder is far better. And that's before a flash.

 

I have never felt that the 5th gen is underpowered or slow. It drives perfectly fine for the boxy soccer mom mobile that it is.

 

I like them too, considered purchasing one before they stopped production. Nothing wrong with them at all.

 

Great numbers and good to see how much the stock 6th gen makes too.

 

Make that 2 in this thread.........,

Not ready yet, only have 1000 miles on it, but definitely interested.



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Tuned this 2025 Trailhunter with OTT Stage 1 with only 315 miles on it. Customer left very happy. I’ll see if I can get him to post a review here.

 

JustDSM is the non hybrid 4Runner tuned faster to 0-60 then the hybrid without a tune? Specifically in RWD since the hybrid 0-60 is around 6.7 seconds?

4Runners aren't race cars but it would be nice to know in general since I'm trying to decide on getting the hybrid or not.

 

Testing done by an individual using the beta version of our Stage 1 tune found that a TRD Off-Road (gas model) was quicker than a completely stock TRD Pro.

The production version of our tune will be slightly quicker than the Beta version, so I don't have any doubt a tuned gas truck will be quicker to 60 than the hybrid without a tune.

As you mentioned, not really the "focus" of our tune, but a byproduct of it making more power at all RPMs is that it will inevitably accelerate more quickly. Personally, as someone who's driven both, I feel the gas models are the better buy if you're open to the idea of tuning them.

 

Some serious numbers. Great job!

 

Thank you!

 

So does Toyota conservatively report it's torque numbers (non-hybrid, 278 hp / 317 lb.ft) and with premium fuel apparently adding gain of around 20hp and 14 lb-ft of torque. Showing 270hp and 341 lb-ft torque on the chart.

Also TRDJon in one of his videos put a cold air intake on which in theory could add some power but from what I know with a vehicle already tuned it just makes the engine more responsive. Put one on my tuned 2015 4Runner as one of many mods and noticed the 4Runner felt smoother throughout the power band.

Thank you for what you do JustDSM.

 

There's more than I have time to unpack to answer a lot of this fully, but in short, you're comparing a vehicle manufacturer's published figures that are at the crankshaft, measured by an engine dyno using an SAEJ2723 Standard, to a chassis dyno measuring the output at the wheel using J1349 Standard. In short, you're going to get yourself tied up in a knot trying to directly compare the Mfg. figures with a traditional DynoJet chassis dyno.

The "numbers," if you will, really can be ignored. If you are using the tool (the dyno) properly and take the necessary steps to keep as many variables constant (or as constant as possible, you can glean a lot from a dyno. However, if you're sloppy in your prep work, and don't pay much, if any, attention to keeping constants, constant. You're going to get garbage results, misleading results, or worse, draw improper conclusions from your data due to inadequate controls.

But that's kind of another topic in of itself..

We always provide a baseline reference for comparison. Regardless of what the Mfg. states/says we take a real-world sample of the vehicle we're working with, to provide us a baseline for whatever we're testing as delivered from the Mfg. you can effectively ignore the "numbers" on the dynochart. The delta between the OE run and the sample run tells the story of what the effects were of any change made.

With regards to Toyota's published numbers, J2723 Standard has a procedure for manufacturers to establish minimum requirements for their fuel system to achieve their certified numbers, but I've not taken the dive to look into what Toyota specifically used. It's not really relevant for us as we're working with actual vehicles on the street using commercial fuels available at the pump, and that's what we're testing/comparing on.

We've dyno tested several intakes on the 4th Gen Tacoma/6th Gen 4Runner, and the "advertised" numbers you see are not in line with our own testing of the product. I won't go into much more detail than that.. I encourage folks to do their own independent testing on intakes.

 

Thank you for explaining that. Read through it a few times to make sure I understood everything.