Hp vs Tq

[darealblaster]

Ok, i think this would make a good informative thread to discuss Hp vs Tq, the differences and what makes what.....

For example, given 2 identical quads but with differente hp and tq numbers which one would win??

300 feet dirt drag race

Quad a: 50hp/20 ft-lb

vs

Quad b: 35hp/37 ft-lb



Please discuss with facts and reason

 

[1bad442]

quad b because torque is what pushes the quad

 

[ricekiller1985]

this is kind of a tuff one because hp and tq are both needed and both very important like a semi truck has around 350 hp but 1000 ft/lb they dont go fast but without all that tq they wouldn't be able to start moving but your corvette has 400 hp and 350 ft/lb it goes fast and gets there fast gearing and weight are the big issue so the quad question would need more info to make an informed decision on the winner of the race generally speaking hp is made in higher rpm and tq in lower rpm so if it was like a blaster with a short first gear you could get the rpm up to the high hp area and keep the revs up from gear to gear the higher hp quad would likely win but if it was a heavier machine with longer gears then the lower tq of the high hp would probably not be enough to keep up with the more evenly balanced numbers of the other machine I think that the 15 hp loss is well worth the 17ft/lb gain on an average machine because you need the tq on the trails

 

[acezeesawtooth]

Im on the other side of that. I think quad A. Even though it has less torque the Quad stays in the higher RPMS through the drag. Hp drives higher rpms. Torque on the other hand gives most of its push during the lower Rpms so while Quad B may have a better start off the line, The high revving horsepower of Quad A will make up for it very quickly. Think about it you dont drop down to say 1k or 2k rpms every time you shift its more like 5k or higher and thats where Hp will give its power. Now if this was a quad pull or snow pushing contest my money would be on quad B.

 

[hudack]

another factor in this would be rider skill rider weight gearing like said above theres more invovled then just hp/tq numbers i think id rather have the tq for i do mostly trail riding i dont know very much on the subject but i think quad a would win in a staright line

 

[blasterdemon7]

quad b because torque is what pushes the quad

Yup. To put it in simple term. TQ gets you up to speed and HP keeps that speed. Am I rite 442?

 

[blasterdemon7]

Oh sh*t. Fhrag is here. He'll set it strait.take us to school buddy.

 

[acezeesawtooth]

I understand that but what drag bikes are you seeing out there with huge torque numbers. They are all high Hp medium Tq. The key to drag racing is keeping ur rpms up where the hp can push it. 300ft is too long of a distance to rely on tq to push you the whole way.

 

[hudack]

Oh sh*t. Fhrag is here. He'll set it strait.take us to school buddy.

agreed.........

 

[1bad442]

Yup. To put it in simple term. TQ gets you up to speed and HP keeps that speed. Am I rite 442?

yes i agree with u what these guys saying hpwr are missing ios that the op question was about a 300 foot drag race in which i feel quad b would win

 

[phragle]

Im not a motor guy... but torque in my mind is ability to do work, hp is work done.

Torque can be multiplied by gearing, hp is hp.

if your fat ass weighs 350 lbs, you need a lot of torque, if yuor draging you want hp.

 

[blasterdad]

Horsepower = torque X rpm / 5252

Here's an interesting bit of trivia; below 5252 rpm any engine's torque number will always be higher than its horsepower number, and above 5252 rpm any engine's horsepower number will always be higher than its torque number. At 5252 rpm the horsepower and torque numbers will be exactly the same.

RevSearch Engine Dyno; Torque vs Horsepower

 

[acezeesawtooth]

yes i agree with u what these guys saying hpwr are missing ios that the op question was about a 300 foot drag race in which i feel quad b would win

thats a football feild length on a quad plenty of time to get up near top speed with proper gearing. R u saying that for 100yds ur gonna be dwelling in the bottom half of the rpm gauge to rely on ur tq to offset that hp difference. Tq means nothing with hp and hp means nothing with tq but for top speeds on light weight machines like quads a little tq goes a long ways, and a little hp goes even further

 

[hudack]

i thnk theres a reason when you hear about a new atv part that increases perforumence you hear hp gains b4 anything else now i think if you were speaking of drag cars it would be a differnt story like phrags said tq can be multiplied by gearing i think that for a quad if your tlking drag racing you gota have hp tq would have a play in there but like said your not racing at 1k 2k rpms atleast im not i rev it out til i gota grab the next gear

 

[1bad442]

thats a football feild length on a quad plenty of time to get up near top speed with proper gearing. R u saying that for 100yds ur gonna be dwelling in the bottom half of the rpm gauge to rely on ur tq to offset that hp difference. Tq means nothing with hp and hp means nothing with tq but for top speeds on light weight machines like quads a little tq goes a long ways, and a little hp goes even further

has nothing to do with what your saying as whats missing here is a torque graph if there was one what u would see is that the quad with more torque will make more oomph threw more of the rpm range than the quad with higher hpwr

u would see a broader torque curve that would keep the motor in the power band longer than the peak hpwr motor

 

[Whitty21]

wait till shee sees this, then this thread is gunna blow

 

[1bad442]

Im not a motor guy... but torque in my mind is ability to do work, hp is work done.

Torque can be multiplied by gearing, hp is hp.

if your fat ass weighs 350 lbs, you need a lot of torque, if yuor draging you want hp.

wow for once im gonna disagree with u in a drag car torque is what gives u et and hpwr will give u more mph and guess what et is what wins races not mph

if 2 cars race and one goes 7.70 @ 182 and one goes 7.74 @ 183.60 who won???? tell me what one has more torque and which has more hpwr

 

[acezeesawtooth]

has nothing to do with what your saying as whats missing here is a torque graph if there was one what u would see is that the quad with more torque will make more oomph threw more of the rpm range than the quad with higher hpwr

u would see a broader torque curve that would keep the motor in the power band longer than the peak hpwr motor

yeah that may be, but when ur are dragging cars you have 3-4 thousands lbs of steel to get moving you need alot of torque to keep it rolling. on things like atvs where you have 3-4 hundred lbs you need very little tq to get it rolling before the hp will be able to take over. you always hear people say keep ur revs up. they are trying to keep the rpms in a range where their superior hp will drive the vehicle down the track. I agree you need tq to get it moving at the start but by the end of that track with that much of a hp advantage quad A is gonna drive away.

 

[1bad442]

i thnk theres a reason when you hear about a new atv part that increases perforumence you hear hp gains b4 anything else now i think if you were speaking of drag cars it would be a differnt story like phrags said tq can be multiplied by gearing i think that for a quad if your tlking drag racing you gota have hp tq would have a play in there but like said your not racing at 1k 2k rpms atleast im not i rev it out til i gota grab the next gear

what do rpms have to do with this???? trorque is present thru the whole rpm range do u guys think torque just stops at 2 k rpm bwahahahahahaha

 

[1bad442]

yeah that may be, but when ur are dragging cars you have 3-4 thousands lbs of steel to get moving you need alot of torque to keep it rolling. on things like atvs where you have 3-4 hundred lbs you need very little tq to get it rolling before the hp will be able to take over. you always hear people say keep ur revs up. they are trying to keep the rpms in a range where their superior hp will drive the vehicle down the track. I agree you need tq to get it moving at the start but by the end of that track with that much of a hp advantage quad A is gonna drive away.

sorry your wrong weight does not matter a push pull force is the same regardless of weight