pagemaster

I am no engine wizard. I know enough about cars but not enough about the engineering that goes into them.

Please can someone explain this.

Why is the Tundra 4.7 litre engine rated 271hp and 313 lb pounds of torque while the LX/LC100 4.7 litres rated at 268hp and 328 lb pounds of torque. Both engine make their peak power at the same RPM.


Shouldn't the LX have more hp because of the higher torque? Both are SAE certified.

Can someone please explain what accounts for this difference? Is it premium fuel? Different spark plugs? would fuel, plugs etc factor in?

What is it..please someone help?

LiCelsior

iTrader: (32)

different uses???? and all cars make peak horsepower at 5252 RPM unless tuned other wise.

GSteg

iTrader: (15)

Torque and horsepower are equal to each other at 5252rpm, but peak horsepower is not always at 5252rpm.

I dont know what exactly goes on in the Tundra/LX470, but the difference could be the tuning in the ECU. The Tundra requires regular 87 octane fuel while the Lx470 requires 91 octane. Perhaps the LX470's timing is more advance than the Tundra, which would warrant the premium fuel that's required. Other than that, the engine should be identical.

PhilipMSPT

iTrader: (5)

Horsepower = ( torque x RPM ) / 5252.

or

Torque = ( horsepower x 5252) / RPM.


If you do that math, they're the same...

pagemaster

Thanks. I thought that is the LX makes more peak torque at the same peak as the Tundra the horsepower would be more at the same peak hp rpm.

4TehNguyen

iTrader: (1)

both cars might have different exhaust setups also

Stelth91

They might lose different amounts of Hp/torque through the rest of the drive line. If they have the same engine, they probably will have different drive line set-ups, and different cars lose different amounts of energy through the diff, trans, driveshaft, etc...

Oh, btw, not ALL cars torque peak at 5252 RPM, the Dodge Viper peaks at like 2800 RPM

LexusFiend

its either driveline loss or exhaust design ... why does it matter anyways? the difference is so minimal. Which vehicle is faster? this depends entirely on which one weighs less (i would guess the tundra)

GSteg

iTrader: (15)

The hp/tq figures are taken at the flywheel. I dont think it can be drivetrain loss if the drivetrain isn't even connected when the engines were dyno'ed.