I don't get how Chevys 5.3 had a higher hp rating than fords 5.4 but the 5.4 has more torque than the 5.3 chevy honestly the only thing holding these ford 5.4s back are it's low hp rating I heard that its the tb that gives chevy more hp they run like 85mm where fords run a 65mm

 

Probly works the same way my dads Toyota 4.7 can blow away my 4.6 like its standing still. Just made differently.

 

Relatively, torque and HP work inversely.
Horsepower =( 2Pi(RPM)(Torque))/33000
equivalently HP=(Torque* RPM) /5252
and Torque= (HP*5252)/RPM

The only time the two can be exactly the same is at 5252 rpm. Actually at 5252rpm every engine has the same HP as Torq.

 

#5.3 L Vortec
#rated HP= 285 hp @ 5200
#rated T = 325 ft-lbs @ 4000rpm
#torque (in ft-lbs) at rated hp =
evalf(285*5252/5200);
287.8500000 ft-lbs at 5200rpm
#hp at rated torque
evalf((325*4000)/5252);
247.5247525
#5.4 L Triton
#rated HP= 260 @4500
#rated T= 350 @ 2500
#torque (in ft-lbs) at rated hp =
evalf((260*5252)/4500);
303.4488889 ft lbs at 4500rpm
#hp at rated torque
evalf((350*2500)/5252);
166.6031988 hp at *2500 rpm* (kind of irrelevant when speaking in hp terms)


So
5.3 Vortex - -----------5.4 Trition
285hp at 5200 - --- - --260hp at 4500
325ft-lbs at 4000 ---- --350 ft-lbs at 2500
287ft-lbs at 5200rpm --- 303 ft-lbs at 4500

Not to mention the newer 315 HP Vortec's still don't produce more torque than the older 5.4 ....In addition its a fairly impractical for the max torque of 325 ft-lbs to be at **4000** rpm


If you plan on racing, yea the Vortex probably has an edge. If you want to effective tow or haul something, I think I'll stick with the 5.4. It beats the older and newer 5.3L in all aspects of Torque ratios. Obviously, gearing can play a huge role in any engine/vehicles performance. But we won't get into that.

Do you want to be pulling a 6-7k trailer running 4000rpm to get 325 ft-lbs. Or would you rather run 2500rmp getting 350 ft-lbs. Its kind of a stupid comparison.

If anything, the older 5.7 (350's) were probably chevy's best towing engines.

 

Hope that helped.

 

Point made. Though these are trucks. Huge, heavy, and meant for hauling. Not racing. So overall, go with the 5.4. These trucks shouldn't be raced, so therefore going really fast shouldn't be a concern.

 

Oh yea I love my 5.4 it's a towing vehicle that's all

 

I tow and race. Go figure.

 

With 15 lbs of boost lol

 

Just with the very small 265hp the truck is prety quick imagine if it was like 365