Will the Turbo engine last (reliability / longevity)?

[Kielly]

Idk man, I've seen turbo F150s reach 300-400k easy. Body was rough but engine still running fine. If Ford can do it, surely Toyota can.

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[Tacosyeg]

It's hard to say without an apples-to-apples comparison of two engines with similar components. You can engineer a gasoline engine to be more durable by using better components in the engine. According to Toyota, they have done that with the Tacoma's engine relative to the same engine in other Toyota products. The use case of a truck, specifically towing, will put more strain on the engine. Likewise, diesel engines are typically engineered with more durable components because of the types of workloads that they are used for - large trucks, worksites, towing, etc. One also has to consider gasoline vs diesel at a fundamental level - diesel is self-lubricating because of its viscosity relative to gasoline. Gasoline is more of a solvent and an acid - a poor lubricant, which can also burn away at engine components over time. However, these effects can be mitigated by over-engineering components.

Another consideration beyond engine operating temperatures is the typical complexity between gasoline and diesel engines. Gasoline engines typically have 25-30% more components than diesel engines because of chains and belt systems. Again, these can be engineered to be more durable, but more things can go wrong in a gasoline engine. Of course, turbochargers add more components, but the same can be said for a diesel engine.

One thing to consider is that diesels typically have greater maintenance costs over a long period of ownership. Note that this doesn't mean the frequency of maintenance is higher but that the increased durability of components results in costlier repairs and an increase in required engine oil. As we have seen, Toyota can produce gasoline engines that withstand time and mileage. It all comes down to how they are designed and engineered and the components' quality.

As far as making a prediction, without data, we are just throwing darts at a wall. Toyota has done extensive testing on this engine and has internal data that seems to support its mantra of having durability. We will soon find out whether that scales up to 150-200k trucks a year.

 

[TacoTanium]

I'm a little skeptical too, we can only wait. So what's the oldest turbo 4 out there?

 

[Sandeep1994]

What i saw so far after driving t24taco for like 2 months now . If u are just driving normal . Its doesn’t even need turbo boost . Truck has enough torque and power without turbo to move around normal in city and highway. It only boost turbo if u go hard on gas . So my opinion it wont be an issue in long run . Turbo will last long . I have Honda civic turbo 8 years old car . Its running fine like same as when i bought new . Even though turbo gets used lot more bcz its very small 1.5l engine . But still no issues so far

 

[Planoman]

Truth is even if it was not rated for the reliability of the V6, I would still go with it for the 8 speed transmission which is so much smoother than the 6 speed. BUT, this is from a guy not looking to go over 100k miles on my 2024 off road. I will probably have a 4 runner by then...

 

[Mini2nut]

I heard a Toyota Tacoma engineer state that the engine is built to commercial truck engine standards with an emphasis on cooling.

 

[MT-Taco]

Turbo is the last thing to worry about.. All the new tech and plastic crap is where the problems will be. I almost bought a gen 3 Tundra but backed out due to the wind noise, window trim gaps, cracking seat panels and squeaking/rattling center console, and catastrophic engine failures. There were early turbo problems but the Tacoma turbo has vacuum waste gate vs the Tundras electronic. I’m guessing, but It seems Tundra was a test for the new TNGA platform? I’m just hoping the catastrophic engine failures don’t become a problem with the Tacoma?! Looks like they fixed most everything else other than some of the tech?

 

[n118nw]

This engine is new to the Tacoma, not to Toyota. It came out in 2021 for the Lexus NX350 and is in 14 other models, including the new Land Cruiser and 4Runner. Turbocharging isn't new technology. like MT said, you'll probably have software/sensor issues before anything mechanical.

 

[Clervis]

I found this video really interesting. It looks like Toyota has been making a concerted effort to improve thermal efficiency in TNGA engines. In terms of engineering, it's a whole slew of innovations to shift the graph below to the right and increase reliability via thermal efficiency. So TNGA has been focused on performance targets like tumble ratio and flow coefficient, combustion speed, exhaust gas temp, knocking mitigation combustion stability, scavenging LSPI, and fuel consumption.

Tinkerer's Adventure:

Here's the SAE publication:
https://www.sae.org/publications/technical-papers/content/2018-01-0366/

 

[zachavm]

The main reason turbos are considered unreliable is because they are traditionally an aftermarket addition. This causes much more power to be generated than the rest of the engine and drivetrain were designed for. Thus things break.

When it is designed for that power by good engineers it should not be a problem.

 

[mcrwlrpro]

I heard a Toyota Tacoma engineer state that the engine is built to commercial truck engine standards with an emphasis on cooling.

^This.

Sheldon Brown, Chief Engineer, said the turbo on the T24A-FTS in the Tacoma is commercial truck grade with 50% more duty cycles over the turbos in their non-truck applications. So, for whatever that's worth, the turbo should hold up well. Only time will tell.

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