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Gen4 4 cylinder engine

2218 Views 40 Replies 24 Participants Last post by  Dimitrij
In a previous post I had stated that I was looking at purchasing a 2020 Sienna as that is the last year for the V6.

Honda continues to produce the V6 only.

The Gen4 Sienna now only comes with the 4 cylinder. It seems with the size of the body that the 4 cylinder engine would not provide the power and reliability of the V6. Comments from a majority of owners indicate slow acceleration, especially with a full load of people and cargo aboard.

I have 2015 Rav4 and the 2.5 engine is more than sufficient for this frame.

As the current owner of a 2010 Sienna and previous owner of a 2002 Sienna the V6 was more than sufficient when hauling cargo and people.

Just curious of owners of the 2021+ Gen 4 owners of your experience with this engine.
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Life is about trade-offs. Yes, I liked my 2011's engine better than our 2022's - definitely peppier. However, our AWD averaged between 19 and 20 MPG and our 22 is pretty consistently in the mid 30s.

I feel that the powertrain is adequate with the hybrid platform whereas the old V6 was slightly more than adequate.
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I have 2015 Rav4 and the 2.5 engine is more than sufficient for this frame.
IIRC, that's the standard ICE model @ 176hp, not the 2.5L hybrid that came out in 2016 @ 196hp. The Sienna hybrid 2.5L combo makes 245hp.

Comments from a majority of owners indicate slow acceleration, especially with a full load of people and cargo aboard.
Just curious of owners of the 2021+ Gen 4 owners of your experience with this engine.
My opinion, is that if you are using it as a tow vehicle, then its a concern. If you never tow anything, dont worry about it.
New Chevy Silverado's (1/2 ton pickup) come with a 4 cylinder. They cost less than the V8, have sufficient power for almost everything except towing heavy loads, then you need the V8. The 2.7 liter 4 cyl, tho pretty much "snubbed" by the people who mostly buy trucks, will tow 9500 pounds and has 430 foot pounds of torque. Its my opinion both the 4 cyl Silverado, and the 4 cyl hybrid Sienna have been unfairly criticized by "old schoolers" that insist on having big motors.
Someone raced a third generation V6 Sienna against a 4th generation 4 cyl hybrid, and the hybrid won in 0 to 60.

The Sienna hybrid has an electric motor (also) which contributes to the hp, and, significantly, electric motors get their power now, while Gas engines need to wait until 4000 or more RPM to achieve the max hp. So, the Sienna hybrid "comes off the line" very very well against the V6 ICE engine.

If "horsepower" is important to you consider a Corvette. However, like many/most Sienna owners, we want to be able to haul many people and or cargo, and get 36 mpg, and are not concerned with taking her to the race track.
I have a 2023 Sienna and have found the hp to be adequate for all my needs, "except", I can not reccommend a Sienna for towing other than extremely light duty towing. Dont use it to tow your camper. You will be disappointed towing a camper up long hills (you will likely also be similarly disappointed with a V6 for towing heavy loads up long hills. ).

Its perfect to get groceries, and I have used mine for several trips (a total of 8400 miles) and have no issues with horsepower. I do have issues with Toyota not getting my second key, and, trying to find a new or almost new 4th gen Sienna for MSRP or below. Im tired of having almost 50 grand in a car, and will be selling my 2023 XLE all wheel drive still under warranty and new condition soon for money reasons..I just dont need to have a 50,000 vehicle to haul 7 people when I have no children at home, and can get by on a 2024 Trax that has heated seats, heated Steering wheel for HALF of what the Sienna costs.
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Comments from a majority of owners indicate slow acceleration...
I remember results of a public opinion poll in the U.S. (the topic is irrelevant) where the first question was about the topic: "do you think.... " ? The majority answered 'yes'. The second question was " do you think you are majority or minority?" The majority answered 'minority'.
The same situation seems to be observed here... I do not know where 'Comments from a majority of owners' came from, but as an owner who just switched from 2006 Sienna to 2023, I indicate that the hybrid accelerates faster on demand under a wide variety of conditions ... probably, because of dynamic/torque characteristics of an electric motor.
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There are many threads here on this topic and it is rare to see anyone complaining about power or acceleration. 0-60 in under 8 seconds is faster than a Mustang or Camaro from not long ago. Top speed of over 115 mph is faster than I'll ever go with my van. We cruise fully loaded and with a top box and/or bikes on the back over big mountains without slowing down. This is simply not an issue from my perspective, especially balanced against the excellent fuel economy.
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There are many threads here on this topic and it is rare to see anyone complaining about power or acceleration. 0-60 in under 8 seconds is faster than a Mustang or Camaro from not long ago. Top speed of over 115 mph is faster than I'll ever go with my van. We cruise fully loaded and with a top box and/or bikes on the back over big mountains without slowing down. This is simply not an issue from my perspective, especially balanced against the excellent fuel economy.
+1.

Search Grapevine or vail pass. Very detailed discussions in those threads.
My opinion, is that if you are using it as a tow vehicle, then its a concern. If you never tow anything, dont worry about it.
New Chevy Silverado's (1/2 ton pickup) come with a 4 cylinder. They cost less than the V8, have sufficient power for almost everything except towing heavy loads, then you need the V8. The 2.7 liter 4 cyl, tho pretty much "snubbed" by the people who mostly buy trucks, will tow 9500 pounds and has 430 foot pounds of torque. Its my opinion both the 4 cyl Silverado, and the 4 cyl hybrid Sienna have been unfairly criticized by "old schoolers" that insist on having big motors.
Someone raced a third generation V6 Sienna against a 4th generation 4 cyl hybrid, and the hybrid won in 0 to 60.

The Sienna hybrid has an electric motor (also) which contributes to the hp, and, significantly, electric motors get their power now, while Gas engines need to wait until 4000 or more RPM to achieve the max hp. So, the Sienna hybrid "comes off the line" very very well against the V6 ICE engine.

If "horsepower" is important to you consider a Corvette. However, like many/most Sienna owners, we want to be able to haul many people and or cargo, and get 36 mpg, and are not concerned with taking her to the race track.
I have a 2023 Sienna and have found the hp to be adequate for all my needs, "except", I can not reccommend a Sienna for towing other than extremely light duty towing. Dont use it to tow your camper. You will be disappointed towing a camper up long hills (you will likely also be similarly disappointed with a V6 for towing heavy loads up long hills. ).

Its perfect to get groceries, and I have used mine for several trips (a total of 8400 miles) and have no issues with horsepower. I do have issues with Toyota not getting my second key, and, trying to find a new or almost new 4th gen Sienna for MSRP or below. Im tired of having almost 50 grand in a car, and will be selling my 2023 XLE all wheel drive still under warranty and new condition soon for money reasons..I just dont need to have a 50,000 vehicle to haul 7 people when I have no children at home, and can get by on a 2024 Trax that has heated seats, heated Steering wheel for HALF of what the Sienna costs.
Not so much worried about the horsepower, I'm more concerned about the 4cyl in the Sienna being able to pull that large frame the Sienna has become.
Remember, it's not the engine only. The electric motors and engine both work together. In fact, you can never fully drain the Hybrid Battery, as the engine will continue to charge it.

But, also remember this, the 4th Gen Sienna has no Alternator, No Starters, and No Belts. AC and Heat can all run electrically with the engine off. This adds additional reliability to the vehicle with less parts to wear down.

Also, from my understanding, the 2.5 is an Atkinson Cycle engine, so it's designed to be more efficient in operation because it doesn't have to work as hard, since the electric motors kick in to assist.

The lag feeling that you describe is also attributed to the eCVT transmission, which has no shifting. It can be perceived as a loss of power, vs a traditional Automatic transmission.

In the end, I'd rather take Reliability and Fuel Savings any day over power and shifting.
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Not so much worried about the horsepower, I'm more concerned about the 4cyl in the Sienna being able to pull that large frame the Sienna has become.
"mini van" buyers prioritize horsepower pretty much dead last. Im in that group. I mean, gee, I do have minimum standards, I would like to be able to keep up with, and pass, a glacier that moves an inch per year. But a smaller vehicle lighter in weight, with similar horsepower will feel like it has both more horses and better fuel economy, as you are pushing less weight.

The Sienna engine, as far as HP, is "more than adequate" but not acceptable for racing or towing. I can accelerate into traffic with no problem.
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Not so much worried about the horsepower, I'm more concerned about the 4cyl in the Sienna being able to pull that large frame the Sienna has become.
Again, 0-60 of under 8 seconds - that's way more than adequate. Why are you "worried"?
Our Prius Prime is "slow" , yet we rarely floor it and that includes when fully loaded with camping gear. Gets excellent mpg. Drive smart and you'll never be short on power.
.... AC and Heat can all run electrically with the engine off. This adds additional reliability to the vehicle with less parts to wear down.
Heat requires the engine. It operates the same way as any other vehicle, using the heated coolant (by the engine) to heat the cabin. Now, you can plug in a less than 1500 watt heater to the invertor for heat, however you will still need to be in "ready" mode (engine on), for anything to run for very long. The HVB is not a large one like you would find in a pure EV. The engine will cycle on and off to keep the HVB charged. It doesn't run very long. Reports are that a gallon or two of gas is used overnight to run the A/C. The heater may use more, as you have to keep the engine hot.
Slow? Yes. Responsive? Also yes. The benefit of the EV assist is that torque is provided instantly. On so many cars these days, the drive by wire (really NOT a wire at all anymore) system really slows down the response of the vehicle to inputs to the accelerator pedal. This isn't an issue with the Gen4 Sienna. Response to accelerator pedal is instant.

This is not the fastest car in the world. It's not trying to be. It was designed to get good fuel economy while hauling 6+ people and their things. It maintains speed up steep grades. Is it happy about it? No, the engine screams and shouts and moans the whole way up the hill, but it gets there. It even has a little extra if you need to pass a truck or something.

In fact, it's a bit weird how the Sienna always seems to "find" a bit more power than maybe you'd expect when you floor it. Having gotten to know this vehicle for over 50,000 miles now, the response is smooth and linear all the way up until the floor. When you get to the floor, it manages to boost you just a bit more. I tell the countless passengers that get in and out of my van daily: "Most vehicles never require the bottom 30% of the gas pedal travel. In this vehicle, you use the whole thing, but you never really need more. It's adequate, but not excessive."
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Consumer Reports' instrumented test figures

Kia CarnivalToyota SiennaHonda OdysseyChrysler PacificaChrysler PacHy
0-30 mph3.4 seconds3.23.43.13.8
0-60 mph8.48.28.18.08.3
45-65 mph4.74.55.15.64.8
1/4 mi/speed16.5/90mph16.4/89mph16.4/89mph16.2/90mph16.5/91mph

The Gen4 Sienna does make lots of engine noise if you floor it, acceleration from a stop is helped by the electric motor providing maximum torque from a standstill. I previously drove an Gen 2 Sienna w/3.3L V6, the Gen 4 is faster. It's also nice to get more than double the fuel economy.
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I thought this one was fun:

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I’ve gotten my van to 110mph. It felt like it had a bit more but… I’ll just say I’m content with what the van can do. Also the whole using whole pedal thing is real. I like it personally, may even get one of those pedal commander boxes, but I’m afraid I’ll lose my already “not great” 32mpg average lol.
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The whole issue for me was, not the capability to go from 0-60 as some of the posts state but does the I4 have the capability to pull the larger frame of the new Sienna. Drag racing was never the desire or intent.
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The whole issue for me was, not the capability to go from 0-60 as some of the posts state but does the I4 have the capability to pull the larger frame of the new Sienna. Drag racing was never the desire or intent.
Obligatory “Itowmyracecarjustfine”

Automotive parking light Car Wheel Tire Vehicle


Went up the socal grapevine in truck lane a-o-k-a-y. This setup gets ~20mpg too.
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.... does the I4 have the capability to pull the larger frame of the new Sienna. ...

Solid yes, and then some.
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The whole issue for me was, not the capability to go from 0-60 as some of the posts state but does the I4 have the capability to pull the larger frame of the new Sienna. Drag racing was never the desire or intent.
power is fine, its a minivan, not a sports car. it can get up and out of its own way just fine, and while it won't tow a huge camper, it can reliably town 1500 pounds with a full load inside without too much issue. I run mine loaded all day, every single day, and it never feels like it has a lack of power on tap if I need it, and torque is instant thanks to the electric motors able to kick in quickly.
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