It got 272 whp! I think this truck is underated by 10 whp!
Mike
If whp = (rear) wheel horse power, where did you get that value? All I've seen is the 305hp in the specs (which I'll now assume is at the torque converter drive?). If true then the factor is about 1.2 engine hp/1.0 whp. Thus the engine hp would be about 317hp?
I do know it is definitely faster than the Ford 300hp 2004 F150 engine.
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2004 Titan LE Crew 4x4
Deep Water
Mud Flaps + Carpets
If whp = (rear) wheel horse power, where did you get that value? All I've seen is the 305hp in the specs (which I'll now assume is at the torque converter drive?). If true then the factor is about 1.2 engine hp/1.0 whp. Thus the engine hp would be about 317hp?
I do know it is definitely faster than the Ford 300hp 2004 F150 engine.
Auto makers usually publish "crank horsepower", or horsepower measured at the end of the crankshaft. This is the true power of the engine. WHP, or Wheel HorsePower, is measured on a chassis dyno, using rolling drums driven by the vehicle's drive wheels. So the chassis dyno measured 272 WHP in this case, or 272 hp at the wheels. It's usually stated that an average drivetrain will "absorb" 15-20% of the power of the engine, due to many things like equipment mass, friction, etc. So given a range of 15-20%, that Titan would be making anywhere from 312.8 to 326.4 hp at the crank (remember Nissan publishes 305 hp at the crank).
Also realize that 15-20% drivetrain efficiency figure is just a general benchmark. Let's say for the sake of argument that Nissan's drivetrain is very efficient, and there's only a 10% loss between the crank and the wheels. In that case, 272 WHP equals 299.2 hp at the crank. We'd really need to know the ACTUAL drivetrain efficiency figure for that particular Titan to know what the ACTUAL power is at the crankshaft.
Auto makers usually publish "crank horsepower", or horsepower measured at the end of the crankshaft. This is the true power of the engine. WHP, or Wheel HorsePower, is measured on a chassis dyno, using rolling drums driven by the vehicle's drive wheels. So the chassis dyno measured 272 WHP in this case, or 272 hp at the wheels. It's usually stated that an average drivetrain will "absorb" 15-20% of the power of the engine, due to many things like equipment mass, friction, etc. So given a range of 15-20%, that Titan would be making anywhere from 312.8 to 326.4 hp at the crank (remember Nissan publishes 305 hp at the crank).
Also realize that 15-20% drivetrain efficiency figure is just a general benchmark. Let's say for the sake of argument that Nissan's drivetrain is very efficient, and there's only a 10% loss between the crank and the wheels. In that case, 272 WHP equals 299.2 hp at the crank. We'd really need to know the ACTUAL drivetrain efficiency figure for that particular Titan to know what the ACTUAL power is at the crankshaft.
Considering it has an automatic transmission the drivetrain loss is more like 25% but conservativly even at 20% the thing is underated.
Mike
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There can only be one Icy Hot Stunta, Don't Hate.
It got 272 whp! I think this truck is underated by 10 whp!
Mike
HI, I was wondering, is everyone with the Titan LE Crew 4x2, getting about 12.9 to 13.2 MPG or is it just me. I got this reading from the display computer in the truck. I spoke to a service manager from a dealer kneer my house and he said that from factory that the computer is pretty acurate..
HI, I was wondering, is everyone with the Titan LE Crew 4x2, getting about 12.9 to 13.2 MPG or is it just me. I got this reading from the display computer in the truck. I spoke to a service manager from a dealer kneer my house and he said that from factory that the computer is pretty acurate..
The computer should be EXACTLY accurate. We have this discussion from time to time on a Cadillac forum I'm on with my other car. Sometimes what you figure at the pump may not coincide with the computer, but the computer is always going to be right (assuming the program code is correct).
There are two variables in figuring fuel mileage: the amount of fuel used and the distance driven. The computer knows EXACTLY how much fuel has been used since last reset because it's controlling the pulse width of the fuel injectors, meaning it's controlling how much fuel passes through each fuel injector. Similarly, as long as the speedometer/odometer is calibrated correctly in your vehicle, the computer also knows EXACTLY how far you've driven since last reset.
The next few tanks, do your own calculations at the fuel pump. Divide the miles driven since the last gas-up by the number of gallons used. This figure should be pretty close to what the computer is reporting. If its wildly off, there may be a problem somewhere, but I'd expect the computer to be spot on.
A couple of thoughts on the mileage questions. My first tank from the dealer yielded about 16.5mpg. The next 2 were about 14.5mpg! and yesterday I got 14.96mpg (after a new oil change with Amsoil synthetic). Based on this and other posts in another thread, I believe one of the factors is the formulation used. I realized I got my truck in another county with no air quality EPA controls, but here in Wake County we do. I know that even different gas stations around me use different levels of ethanol and MBTB (?) and they do make a noticeable difference in fuel economy.
Cheers,
dagger
__________________
2004 Titan LE Crew 4x4
Deep Water
Mud Flaps + Carpets
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