rider56AK Posted January 23, 2011 Share Posted January 23, 2011 whats the rwhp of my stock f-150? and why arent the RWHP numbers being advertised instead of the flywheel numbers? its false advertising if you ask me Quote Link to comment Share on other sites More sharing options...
waloud Posted January 23, 2011 Share Posted January 23, 2011 It's not false advertising. The flywheel horsepower is standard procedure for all manufactures. I believe the horsepower is figured this way in small engines all the way to automotive. Quote Link to comment Share on other sites More sharing options...
rider56AK Posted January 23, 2011 Author Share Posted January 23, 2011 It's not false advertising. The flywheel horsepower is standard procedure for all manufactures. I believe the horsepower is figured this way in small engines all the way to automotive. its misleading. alot of people believe thats the actual horsepower and torque. i hate trying to explain to people that when you put an 8,000 pound truck in btween the engine, youre going to lose a bit of power. they just dont get it Quote Link to comment Share on other sites More sharing options...
akirby Posted January 23, 2011 Share Posted January 23, 2011 its misleading. alot of people believe thats the actual horsepower and torque. i hate trying to explain to people that when you put an 8,000 pound truck in btween the engine, youre going to lose a bit of power. they just dont get it Um...that IS the ACTUAL hp and torque produced by the engine. To do it like you suggest would require different hp ratings for each transmission/rear axle/wheel and tire combination. Since EVERY vehicle loses power parasitically between the engine and the rear wheels at roughly the same percentages it's a non-issue. Quote Link to comment Share on other sites More sharing options...
fordmantpw Posted January 24, 2011 Share Posted January 24, 2011 Not to mention, it is done the same for ALL manufacturers, so it's an apples to apples comparison when comparing numbers between different makes. Quote Link to comment Share on other sites More sharing options...
rider56AK Posted January 24, 2011 Author Share Posted January 24, 2011 Not to mention, it is done the same for ALL manufacturers, so it's an apples to apples comparison when comparing numbers between different makes. ok so say you go to a car lot and you look at a 6.7 f-250 single cab and a 6.7 f-350 crew cab. ford is going to post the same numbers based on the engine size but you know for a fact that the truck its self is not going put down the same power as its big brother. so why would you even want to waste your time looking at the numbers that the engine itself makes. if i bought a new truck i want to know the hp and torque that particular model makes. shit, even the leather heated seats could play a weight factor in the dyno testing. Quote Link to comment Share on other sites More sharing options...
fordmantpw Posted January 24, 2011 Share Posted January 24, 2011 ok so say you go to a car lot and you look at a 6.7 f-250 single cab and a 6.7 f-350 crew cab. ford is going to post the same numbers based on the engine size but you know for a fact that the truck its self is not going put down the same power as its big brother. so why would you even want to waste your time looking at the numbers that the engine itself makes. if i bought a new truck i want to know the hp and torque that particular model makes. shit, even the leather heated seats could play a weight factor in the dyno testing. Simple. If you need (or want) the F250 single cab, buy it. If you need (or want) the F350 crew cab, buy that. Who cares how much power each puts to the ground, they both start with the same engine...buy what suits your needs (or wants)! The total power the truck makes has nothing to do with how much it weighs or the number of options the truck has. The power to the ground on those two trucks should be very close (within tolerances of the ratings across the powertrain), unless the crew cab is a long bed, in which case there may be slightly more parasitic loss due to the longer drive shaft (what, 0.5 - 1HP diff maybe). Honestly, I have no idea WTH you are concerned about. Quote Link to comment Share on other sites More sharing options...
akirby Posted January 24, 2011 Share Posted January 24, 2011 if i bought a new truck i want to know the hp and torque that particular model makes. shit, even the leather heated seats could play a weight factor in the dyno testing. That proves you don't have a clue. Weight doesn't factor into chassis dyno testing. Neither does aerodynamics since the truck isn't actually moving. If you're worried about which one is faster then look up the 0-60 and 1/4 mile times as tested on the track because a dyno chassis won't give you accurate numbers either. Quote Link to comment Share on other sites More sharing options...
rider56AK Posted January 24, 2011 Author Share Posted January 24, 2011 That proves you don't have a clue. Weight doesn't factor into chassis dyno testing. Neither does aerodynamics since the truck isn't actually moving. If you're worried about which one is faster then look up the 0-60 and 1/4 mile times as tested on the track because a dyno chassis won't give you accurate numbers either. how would weight not matter? Quote Link to comment Share on other sites More sharing options...
rider56AK Posted January 24, 2011 Author Share Posted January 24, 2011 Simple. If you need (or want) the F250 single cab, buy it. If you need (or want) the F350 crew cab, buy that. Who cares how much power each puts to the ground, they both start with the same engine...buy what suits your needs (or wants)! The total power the truck makes has nothing to do with how much it weighs or the number of options the truck has. The power to the ground on those two trucks should be very close (within tolerances of the ratings across the powertrain), unless the crew cab is a long bed, in which case there may be slightly more parasitic loss due to the longer drive shaft (what, 0.5 - 1HP diff maybe). Honestly, I have no idea WTH you are concerned about. okay. i just want to know what my f-150 makes at the rear wheels. thats how this convo got started!! BUT what im pissed about is that if i went to go buy a new car, all they would tell me is how strong the engine itself is, not the car. i could really care less what the ENGINE BY ITSELF WOULD MAKE...when was the last time you used your car's engine when it wasnt in your car....ill wait.... see never..i want to know how strong the vehicle as a whole is, not with parts missing. maybe its just me thats concerned about this but whatever.. Quote Link to comment Share on other sites More sharing options...
fordmantpw Posted January 24, 2011 Share Posted January 24, 2011 how would weight not matter? Take one truck, put it on a dyno. You get x HP. Take same truck, add 4k lbs to the bed (big truck here) put it on a dyno. You get x HP. x = x. Actually, a test a while back, pickuptrucks.com added 1200 (I think) lbs. to the bed of a Super Duty to keep it planted on the dyno to keep it from spinning it's tires! Weight has no effect on the HP a vehicle makes, nor the amount of HP that vehicle puts to the ground. None. Zero. Zilch. Nada. Quote Link to comment Share on other sites More sharing options...
fordmantpw Posted January 24, 2011 Share Posted January 24, 2011 okay. i just want to know what my f-150 makes at the rear wheels. thats how this convo got started!! BUT what im pissed about is that if i went to go buy a new car, all they would tell me is how strong the engine itself is, not the car. i could really care less what the ENGINE BY ITSELF WOULD MAKE...when was the last time you used your car's engine when it wasnt in your car....ill wait.... see never..i want to know how strong the vehicle as a whole is, not with parts missing. maybe its just me thats concerned about this but whatever.. That's called the tow rating. Takes the entire car/truck into the equation. You want to know how much HP a vehicle makes at the wheels? Take about 15-20% off the stated engine numbers and you will be close. Quote Link to comment Share on other sites More sharing options...
rider56AK Posted January 24, 2011 Author Share Posted January 24, 2011 That's called the tow rating. Takes the entire car/truck into the equation. You want to know how much HP a vehicle makes at the wheels? Take about 15-20% off the stated engine numbers and you will be close. ok, so a 1995-2000(?) vortec 5.7 makes 260hp and over 300 ft/lbs of torque at the rear wheels. and if you take my 2006 5.4's 300 flywheel hp and subtract 15% that would be at 255....thats horrible considering the chevy is 10 years older. ford needs to step their game up Quote Link to comment Share on other sites More sharing options...
NLPRacing Posted January 24, 2011 Share Posted January 24, 2011 how would weight not matter? Flywheel horsepower is horsepower measured at the flywheel on an engine dyno. Wheel horsepower (whether front, rear or all) is horsepower measured at the wheel on a chassis dyno. Engines lose power through the transmission, rear end, etc. The weight of the vehicle has no bearing on flywheel horsepower or wheel horsepower. ok, so a 1995-2000(?) vortec 5.7 makes 260hp and over 300 ft/lbs of torque at the rear wheels. and if you take my 2006 5.4's 300 flywheel hp and subtract 15% that would be at 255....thats horrible considering the chevy is 10 years older. ford needs to step their game up Who says all 1995-2000 Vortec 5.7's make 260hp at the rear wheels? Quote Link to comment Share on other sites More sharing options...
fordmantpw Posted January 24, 2011 Share Posted January 24, 2011 ok, so a 1995-2000(?) vortec 5.7 makes 260hp and over 300 ft/lbs of torque at the rear wheels. and if you take my 2006 5.4's 300 flywheel hp and subtract 15% that would be at 255....thats horrible considering the chevy is 10 years older. ford needs to step their game up No, those 5.7 numbers are at the crank, just like Ford's 300. Again, ALL manufacturers post numbers at the engine! Quote Link to comment Share on other sites More sharing options...
rider56AK Posted January 24, 2011 Author Share Posted January 24, 2011 No, those 5.7 numbers are at the crank, just like Ford's 300. Again, ALL manufacturers post numbers at the engine! google it. or wikipedia Quote Link to comment Share on other sites More sharing options...
NLPRacing Posted January 24, 2011 Share Posted January 24, 2011 (edited) google it. or wikipedia Do you even know what you're talking about? Wiki - Horsepower Edited January 24, 2011 by NLPRacing Quote Link to comment Share on other sites More sharing options...
NLPRacing Posted January 24, 2011 Share Posted January 24, 2011 From Wiki 5700The Vortec 5700 L31 is a V8 truck engine. Displacement is 5.7 L. It is the last production Generation I small-block from Chevrolet. The cylinder heads feature combustion chambers very similar to those of the LT1 V8, but without the reverse-flow cooling. As such, the L31 head is compatible with all older small-blocks, and is a very popular upgrade. It offers the performance of more expensive heads, at a much lower cost. It does, however, require a specific intake manifold (a Vortec head has four bolts attaching the intake manifold as opposed to the traditional six bolts per head). The L31 was replaced by the 5.3 L 5300 LM7. The 2002 model year was the final year for the L31 5.7 L small block V-8 whose origins date back to 1955. The Vortec 5700 produces 255 hp (191 kW) to 350 hp (261 kW) at 4600 rpm and 330 ft-lbf (448 N·m) to 350 ft-lbf (475 N·m) of torque at 2800 rpm. It is currently being produced as a crate engine for marine applications and automotive hobbyists as the "ramjet 350" with minor modifications. L31 applications: 1996–2003 Chevrolet Express/GMC Savana full-size vans 1996–1999 Chevrolet/GMC C/K full-size trucks 1996–1999 Chevrolet Suburban/GMC Suburban full-size long-wheelbase SUVs 1996–1999 Chevrolet Tahoe/GMC Yukon (and 2000 Tahoe Limited) full-size short-wheelbase SUVs 1999–2000 Cadillac Escalade TBI L31 applications 1996 G-Series vans over 8,500 lb (3,856 kg) GVW w/ 4L80E transmission Special applications Oscar Mayer Wienermobile Isuzu Box Trucks Where does it say "rear wheel"??!? Quote Link to comment Share on other sites More sharing options...
fordmantpw Posted January 24, 2011 Share Posted January 24, 2011 google it. or wikipedia Go for it...then show me your link. I have better things to do... Quote Link to comment Share on other sites More sharing options...
nemosdad Posted January 24, 2011 Share Posted January 24, 2011 This....is quite entertaining! Quote Link to comment Share on other sites More sharing options...
Ford850 Posted January 25, 2011 Share Posted January 25, 2011 Do you even know what you're talking about? Wiki - Horsepower Haha. I think we all know the answer to that question. Good luck getting through to this one. Quote Link to comment Share on other sites More sharing options...
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