Has anyone done the OTT Tune?

[Devildog81]

The wall of torque in the dyno chart is anything but understressed

Hope Toyota made the bottom ends stout. Guess we will find out lol definitely never tuning my truck.

Edit:
125hp/Liter post tune is no joke, that's more than an EJ STI. Those exploded for entirely different reasons, but were in no way an "understressed" motor. They also had the benefit of shorter OCI (Subaru recommended 3,000 miles), thicker oil, single scroll turbo tuned for higher RPM torque, and lower compression (reduces risk of knock/LSPI), and despite all this still sometimes blew up

These offset rods better be good shit

Here’s the breakdown of these 2.4’s. You might find it interesting on how well these are built. https://www.toyota-club.net/files/faq/21-09-20_faq_t24-engine_en.htm

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[mikeymtbs]

Successful tune tonight on my 4th gen taco and 3 buddies with 3rd gen’s. Felt good on the way home, will report back more over the next few days.

 

[GMak621]

The wall of torque in the dyno chart is anything but understressed

Hope Toyota made the bottom ends stout. Guess we will find out lol definitely never tuning my truck.

Edit:
125hp/Liter post tune is no joke, that's more than an EJ STI. Those exploded for entirely different reasons, but were in no way an "understressed" motor. They also had the benefit of shorter OCI (Subaru recommended 3,000 miles), thicker oil, single scroll turbo tuned for higher RPM torque, and lower compression (reduces risk of knock/LSPI), and despite all this still sometimes blew up

These offset rods better be good shit

My GLA45 had approx. 200hp per liter. And then I tuned it after that. Never an issue.

125 is nothing. Also, thanks for dropping in to tell us all you’re not interested.

 

[izzy]

Here’s the breakdown of these 2.4’s. You might find it interesting on how well these are built. https://www.toyota-club.net/files/faq/21-09-20_faq_t24-engine_en.htm

Yeah I checked that a while back in 2024, before I bought the truck. Toyota did a good job with these engines, they're pretty simple for a modern gas turbo setup (aside from the crazy coolant director gizmo).

Stuff like the piston oil squirters, dual injection, offset crank, big IC, and seemingly beefy bottom end (yet to be determined) is cool.

Very interested to see how long the tuned motors last.

 

[izzy]

My GLA45 had approx. 200hp per liter. And then I tuned it after that. Never an issue.

125 is nothing. Also, thanks for dropping in to tell us all you’re not interested.

A hand built 4 banger with forged pistons and rods and crank isn't really a fair comparison LOL

 

[GMak621]

A hand built 4 banger with forged pistons and rods and crank isn't really a fair comparison LOL

It should be even more impressive that Toyota can manufacture one that isn’t hand built and can handle it.


Let’s get back on topic.


Have had mine OTT tuned 5 weeks now. MPGs are exactly the same if not a smidge better. Spools quicker and holds 8th gear like a dream.

 

[Devildog81]

It should be even more impressive that Toyota can manufacture one that isn’t hand built and can handle it.


Let’s get back on topic.


Have had mine OTT tuned 5 weeks now. MPGs are exactly the same if not a smidge better. Spools quicker and holds 8th gear like a dream.

Couldn’t agree more with you. I had two of my 3rd gen’s tuned with OTT and now my 4th gen, before the tune to after the tune is night and day difference. OTT has a track record second to none on the Toyota tuning side for these trucks. Before I went with OTT on my first 3rd gen I went with one of their competitors which was no comparison to the linear power delivery of the OTT tune and transmission mapping which is about perfect in my opinion.

 

[Idaho-Taco]

We do have a Stage 2 calibration in the works that is tailored specifically for use with the common bolt-ons using premium fuel only for peak performance on the OE Turbocharger.

Stage 3 (also in the works) will build on Stage 2, and focus around a bolt-in OEM Turbo upgrade and premium fuel only.

Lots more to come!

Was wondering if there is an update on the release of these different stages. Just getting ready to start a build with a new hybrid and looking to get it tuned. I believe my local OTT shop is Taco Vinyl.

 

[JustDSM]

Was wondering if there is an update on the release of these different stages. Just getting ready to start a build with a new hybrid and looking to get it tuned. I believe my local OTT shop is Taco Vinyl.

Hey Jevon,

We're getting really close!

Stage 1 Update Incoming

We’ve got a big update dropping very soon for Stage 1 (and up):

We've successfully eliminated the load/boost limiters in 1st and 2nd gear for gas trucks — hybrids were never restricted. The result? Full target boost/load in lower gears for stronger launches and more aggressive acceleration from a dig.

This change has been torture-tested in our development truck, including repeated full-boost 4Lo launches and even with the 4Lo rev limiter removed (6300 RPM shifts). After two months of abuse, the results have been rock-solid; drivetrain durability has remained unaffected.

We’ve got a few other small tweaks in the works as well — we’ll announce those once they're finalized.

Stage 2 – Update

Stage 2 is designed to take the next logical step beyond Stage 1, targeting more efficient use of the stock turbocharger through carefully selected supporting hardware. This calibration is premium fuel only, and it aims to maximize power, response, and thermal stability while maintaining reliability.

We've completed testing on several key components and can now outline the recommended hardware roadmap for Stage 2:

• Intake:
  Not required, but supported. Some aftermarket systems may require MAF recalibration, so check with your OTT retailer before installing.
• Intercooler:
  Required. The OE unit is insufficient under elevated load and sustained boost. Aftermarket core will reduce pressure drop, keep manifold charge temperatures lower for a longer duration, and provide a quicker recovery than the OE unit.
• Throttle Body Elbow:
  Currently in R&D. Our testing suggests it will significantly reduce pressure drop at the inlet, helping move more air into the cylinder without increasing turbo workload. While we may release Stage 2 before it’s available, we expect it to become a key component in the Stage 2 ecosystem.
• Downpipe:
  We’re actively testing a high-flow catted option built around the GESI Gen2 Advanced Series 400-cell catalyst, rated to 500 hp and EPA-compliant. If it clears our internal emissions validation (via 5-gas analyzer and drive cycle tests), it may debut as part of a future “Stage 2+” configuration. Worth noting — this wasn’t originally part of the Stage 2 plan, but the results are promising.
• Cat-Back Exhaust:
  Required. Improved flow and backpressure reduction play a significant role in consistency and response.

If you're running any additional modifications not listed here, please coordinate with your OTT retailer or contact us directly to confirm compatibility.

Stage 3 – Update

We hit a minor snag with our turbocharger supplier due to inconsistencies between U.S. and Japanese engineering documentation — specifically, OE turbo shaft measurements didn’t match provided specs, which delayed validation. That’s now being sorted, but it did cost us some time.

Once resolved, Stage 3 will drop right into the same hardware environment as Stage 2, with the only change being the turbocharger itself. It will retain the stock housings and maintain a 100% OEM appearance for true stealth. We're targeting completion by end of August.

Stage 4 – Preview

Stage 4 will support VFTuner’s G25-550/660 turbo kit for those chasing maximum output. We’ll have the kit in hand soon and begin calibration work as soon as it arrives.

Thanks again for everyone’s patience while we continue refining the platform. We’re stoked to get this into your hands soon!

 

[RatInsurance]

Hey Jevon,

We're getting really close!

Stage 1 Update Incoming

We’ve got a big update dropping very soon for Stage 1 (and up):

We've successfully eliminated the load/boost limiters in 1st and 2nd gear for gas trucks — hybrids were never restricted. The result? Full target boost/load in lower gears for stronger launches and more aggressive acceleration from a dig.

This change has been torture-tested in our development truck, including repeated full-boost 4Lo launches and even with the 4Lo rev limiter removed (6300 RPM shifts). After two months of abuse, the results have been rock-solid; drivetrain durability has remained unaffected.

We’ve got a few other small tweaks in the works as well — we’ll announce those once they're finalized.

Stage 2 – Update

Stage 2 is designed to take the next logical step beyond Stage 1, targeting more efficient use of the stock turbocharger through carefully selected supporting hardware. This calibration is premium fuel only, and it aims to maximize power, response, and thermal stability while maintaining reliability.

We've completed testing on several key components and can now outline the recommended hardware roadmap for Stage 2:

• Intake:
  Not required, but supported. Some aftermarket systems may require MAF recalibration, so check with your OTT retailer before installing.
• Intercooler:
  Required. The OE unit is insufficient under elevated load and sustained boost. Aftermarket core will reduce pressure drop, keep manifold charge temperatures lower for a longer duration, and provide a quicker recovery than the OE unit.
• Throttle Body Elbow:
  Currently in R&D. Our testing suggests it will significantly reduce pressure drop at the inlet, helping move more air into the cylinder without increasing turbo workload. While we may release Stage 2 before it’s available, we expect it to become a key component in the Stage 2 ecosystem.
• Downpipe:
  We’re actively testing a high-flow catted option built around the GESI Gen2 Advanced Series 400-cell catalyst, rated to 500 hp and EPA-compliant. If it clears our internal emissions validation (via 5-gas analyzer and drive cycle tests), it may debut as part of a future “Stage 2+” configuration. Worth noting — this wasn’t originally part of the Stage 2 plan, but the results are promising.
• Cat-Back Exhaust:
  Required. Improved flow and backpressure reduction play a significant role in consistency and response.

If you're running any additional modifications not listed here, please coordinate with your OTT retailer or contact us directly to confirm compatibility.

Stage 3 – Update

We hit a minor snag with our turbocharger supplier due to inconsistencies between U.S. and Japanese engineering documentation — specifically, OE turbo shaft measurements didn’t match provided specs, which delayed validation. That’s now being sorted, but it did cost us some time.

Once resolved, Stage 3 will drop right into the same hardware environment as Stage 2, with the only change being the turbocharger itself. It will retain the stock housings and maintain a 100% OEM appearance for true stealth. We're targeting completion by end of August.

Stage 4 – Preview

Stage 4 will support VFTuner’s G25-550/660 turbo kit for those chasing maximum output. We’ll have the kit in hand soon and begin calibration work as soon as it arrives.

Thanks again for everyone’s patience while we continue refining the platform. We’re stoked to get this into your hands soon!

Will any aftermarket exhaust work for the stage 2 tune or are there specifics you are working with that we would need for it to work properly?

 

[Norsk]

Hey Jevon,

We're getting really close!

Stage 1 Update Incoming

We’ve got a big update dropping very soon for Stage 1 (and up):

We've successfully eliminated the load/boost limiters in 1st and 2nd gear for gas trucks — hybrids were never restricted. The result? Full target boost/load in lower gears for stronger launches and more aggressive acceleration from a dig.

This change has been torture-tested in our development truck, including repeated full-boost 4Lo launches and even with the 4Lo rev limiter removed (6300 RPM shifts). After two months of abuse, the results have been rock-solid; drivetrain durability has remained unaffected.

We’ve got a few other small tweaks in the works as well — we’ll announce those once they're finalized.

Stage 2 – Update

Stage 2 is designed to take the next logical step beyond Stage 1, targeting more efficient use of the stock turbocharger through carefully selected supporting hardware. This calibration is premium fuel only, and it aims to maximize power, response, and thermal stability while maintaining reliability.

We've completed testing on several key components and can now outline the recommended hardware roadmap for Stage 2:

• Intake:
  Not required, but supported. Some aftermarket systems may require MAF recalibration, so check with your OTT retailer before installing.
• Intercooler:
  Required. The OE unit is insufficient under elevated load and sustained boost. Aftermarket core will reduce pressure drop, keep manifold charge temperatures lower for a longer duration, and provide a quicker recovery than the OE unit.
• Throttle Body Elbow:
  Currently in R&D. Our testing suggests it will significantly reduce pressure drop at the inlet, helping move more air into the cylinder without increasing turbo workload. While we may release Stage 2 before it’s available, we expect it to become a key component in the Stage 2 ecosystem.
• Downpipe:
  We’re actively testing a high-flow catted option built around the GESI Gen2 Advanced Series 400-cell catalyst, rated to 500 hp and EPA-compliant. If it clears our internal emissions validation (via 5-gas analyzer and drive cycle tests), it may debut as part of a future “Stage 2+” configuration. Worth noting — this wasn’t originally part of the Stage 2 plan, but the results are promising.
• Cat-Back Exhaust:
  Required. Improved flow and backpressure reduction play a significant role in consistency and response.

If you're running any additional modifications not listed here, please coordinate with your OTT retailer or contact us directly to confirm compatibility.

Stage 3 – Update

We hit a minor snag with our turbocharger supplier due to inconsistencies between U.S. and Japanese engineering documentation — specifically, OE turbo shaft measurements didn’t match provided specs, which delayed validation. That’s now being sorted, but it did cost us some time.

Once resolved, Stage 3 will drop right into the same hardware environment as Stage 2, with the only change being the turbocharger itself. It will retain the stock housings and maintain a 100% OEM appearance for true stealth. We're targeting completion by end of August.

Stage 4 – Preview

Stage 4 will support VFTuner’s G25-550/660 turbo kit for those chasing maximum output. We’ll have the kit in hand soon and begin calibration work as soon as it arrives.

Thanks again for everyone’s patience while we continue refining the platform. We’re stoked to get this into your hands soon!

Can't wait for Stage 1 Update! Hopefully It will be ready before I head up to Cape Cod in August! Loving the tune everyday and haven't looked back!

My question - I notice it is very difference to do burnout in my truck than it was easy to do in 3G truck. Maybe toyota made it more difficult to do it in newer trucks?

 

[Amorak]

I’ve had the OTT tune now for a while and it’s been great. The extra power makes the truck so much more enjoyable! Check out my video on it.

Enjoy your videos. You do a nice job.

 

[JustDSM]

Will any aftermarket exhaust work for the stage 2 tune or are there specifics you are working with that we would need for it to work properly?

Pretty much all of the stuff on the market will suffice. Ideally, you'll want something at least 2.5"-3" and have a muffler with low backpressure.

 

[RutsyBucket]

Had the tune installed by Quoc in San Diego on Saturday. 10/10, would recommend. You don't realize how bad the stock tune is until you drive this one. Absolutely changes the experience and makes the truck a joy to drive. My only concern is reliability, both on the tune, and the 4th gen tacoma overall. Oh well. It's bought and paid for and no looking back now.

 

[Cabby30]

Stage 1 Update Incoming

We’ve got a big update dropping very soon for Stage 1 (and up):

We've successfully eliminated the load/boost limiters in 1st and 2nd gear for gas trucks — hybrids were never restricted. The result? Full target boost/load in lower gears for stronger launches and more aggressive acceleration from a dig.

This change has been torture-tested in our development truck, including repeated full-boost 4Lo launches and even with the 4Lo rev limiter removed (6300 RPM shifts). After two months of abuse, the results have been rock-solid; drivetrain durability has remained unaffected.

We’ve got a few other small tweaks in the works as well — we’ll announce those once they're finalized.

I was planning to get my truck tuned next week. If it is coming soon, should I hold off until the update is pushed to the retailers?

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