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Open Roads Forum  >  Tow Vehicles

 > Ecoboost vs. V8 - Can you explain?

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Mickeyfan0805

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Posted: 08/28/19 08:31am Link  |  Quote  |  Print  |  Notify Moderator

I'm nowhere near being a gearhead, and I can't seem to wrap my mind around how the Ecoboost outperforms the V8 in towing. I understand the fuel economy issue, but how is it that the V6 can actually have a higher tow rating than the V8? Can anyone explain in layman's terms?

TurnThePage

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Posted: 08/28/19 08:52am Link  |  Quote  |  Print  |  Notify Moderator

If you forget about descriptive terms like v6 and v8 and just look at the specs, it's pretty obvious. The Ecoboost builds twist early in the RPMs and applies it continuously. The v8 has to wind up before it achieves similar power. The v8 has a little more horse power, but it's only available at wide open throttle at very high RPMs. All the rest of the time the Ecoboost will be the more powerful engine.


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ShinerBock

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Posted: 08/28/19 09:04am Link  |  Quote  |  Print  |  Notify Moderator

Because the 3.5L Ecoboost makes more horsepower and torque than the 5.0L between 1,700 and 5,000 rpm especially between 2,000 to 3,000 rpm where it makes up to 75 hp and 150 lb-ft more. This low end power makes for more usable power in more gears and speeds. Similar to why a turbo diesel is a better tow engine than an N/A gas engine.

The 5.0L starts making more horsepower around 5,500 rpm which is good for the drag strip, but not for towing.

fx2tom

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Posted: 08/28/19 09:22am Link  |  Quote  |  Print  |  Notify Moderator

Mickeyfan0805 wrote:

I'm nowhere near being a gearhead, and I can't seem to wrap my mind around how the Ecoboost outperforms the V8 in towing. I understand the fuel economy issue, but how is it that the V6 can actually have a higher tow rating than the V8? Can anyone explain in layman's terms?


Overly simplified - turbochargers

Mickeyfan0805

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Posted: 08/28/19 09:25am Link  |  Quote  |  Print  |  Notify Moderator

Exactly the type of siumplified answers I was looking for. Thank you!

parker.rowe

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Posted: 08/28/19 09:54am Link  |  Quote  |  Print  |  Notify Moderator

Part throttle with a turbo is also an important difference as to why it feels like they tow so well too.

Turbo's are load dependent. Let's see if I can explain simply....

You a cruising at 1/4 throttle.

You hit a hill...engine is working harder (more load).

Turbo boost increase, power increases, you go up the hill without having to push the throttle more.

This doesn't address the tow rating increase, and obviously there are limits to this, but it does explain why people like the way towing with a turbocharged engine "feels".


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twodownzero

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Posted: 08/28/19 10:20am Link  |  Quote  |  Print  |  Notify Moderator

Two words: volumetric efficiency.

Under load, it moves more air, burns more fuel, and makes more power.

mich800

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Posted: 08/28/19 10:26am Link  |  Quote  |  Print  |  Notify Moderator

Unfortunately the V8 vs V6 and straight vs V preconceptions are hard to break. This thread could probably be merged with the "what defines a 3/4 truck". It is about the performance of that component or assembly not what label you put on it.

dockmasterdave

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Posted: 08/28/19 11:15am Link  |  Quote  |  Print  |  Notify Moderator

Because a 3.5 litre ecoboost, with the turbos open, displaces @ 6.0 litres of fuel and air.
6.0 litres beats 5.0 litres. Plus it makes over 80% of it's power from just above 1500 rpm, the 5.0 v8 probably doesn't make max power till 4000 rpm. Drive one and you'll understand.


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RoyJ

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Posted: 08/28/19 12:25pm Link  |  Quote  |  Print  |  Notify Moderator

Very simple answer - because the EB makes more power.

At a given speed, power determines how much thrust you have.

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