the differnce betwenn hp and tourque

[tim curran]

on my 1st dyno run my truck made 215 hp and I think 460 p.o.t. I made some upgrades that I stated in my discription. then I did another run. my numbers were 212 hp and 608 p.o.t. How does my torque climp but my hp drop. I have recently turned my pump down because I am getting way to much fuel for my turbo to hadle. I will upgrade my comp. housing soon. Why dosn't hp climb with tourque? Also my power numbers where at a much lower rpm around 2000.

[Richie O]

Did they use an optical tach pick up on both runs? I think they put it on you back in October when you ran. If you turned down your power screw and the torque came up then you can see what the tighter converter did for you.

[KTA]

Hp and torque are directly related at any given RPM. As Hp or torque goes up so does the other. The numbers you quote are for peaks, which don't usualy occur at the same rpms so they don't relate. When one changes but the other doesn't it means the shape of your power curve has changed.

[tim curran]

I still don't get how my touque can go up 150 lbs and my hp stay the same. My tourque was at 1880 and my hp at 2200. What is the point of higher rpm springs if all my numbers are down low. I am running a stock pump that is turned all the way up. If I run out of fuel at higher rpms why does it still blow so much smoke.

[dpuckett]

For your smoke, it could be that the stock lift pump isnt supplying enough pressure to the IP to properly compound the fuel pressure, making for slightly coarser atomization of the fuel. I ran into this in my W350- it would black out an intersection with the Bully Dog 80hp sticks. installed a low pressure piston lift pump, and the smoke all but disappeared- everything else was the same.

Horsepower is a function of torque, and is relative to the RPM. You can make say, 225hp, but have different torque readings, depending on what RPM you see that 225hp. If you have 225hp at 1800rpm, you will have a lot more torque than you will with the same power at 3000rpm. The equation is-

HP= T x RPM/ 5252.

Plug in 225= T x 1800/5252. T= 656.5
225= T x 3000/5252 T= 393.9

Daniel

[Greenleaf]

HP is a Farmall Super MTA and Torque is a John Deere 70
A GMC 454 and a Cummins Five-Nine.

[1STGENFARMBOY]

MTA! HA HA HA not really, torque is a 502ci 2cyl John Deere D plowing at 900 rpm with 3-16's in road
gear!!! lets have a plowing contest, shall we.

[Richie O]

I know my 620 deere has nothing compared to a super MTA. In my weight class they blow my doors off. I had to buy a farmall 300 so I could get a trophy. ( I do love my deeere though )

[1STGENFARMBOY]

My friend has a super MTA that dynos at 65 hp and thats good, my D dynos at 55 hp
you would think he could out plow me but nope not by a long shot, That's the diffenance
between T/Q and H/P, Just like the hp on a 454 my be 375 and the hp on a 5.9 is 160
but theres no way the 454 will out pull the Cummins, I think that's what
Greenleaf is sayin in my simple mind.

[Richie O]

My 620 is at 46 pto hp which is right for a stock tractor. They were rated at 48 hp at the belt pulley and I am sure I lose atleast 2 hp through the tranny to the pto shaft. ( most likely more then that ). Our kabota is rated at 52 engine hp and like 44 pto power. It looses 8 hp from a to b. I know my deere has good torque but those pesky Farmalls , Olivers, Massy harris, Min molene, they all beat me. Some of them run the big 18.4 tires and have plenty of power to spare. I run new 16.9's and run out of power in 2nd gear. I can run 1st but its so slow I don't get any speed on the drag. Well, lunch break is over, time to go back at it.

[1STGENFARMBOY]

I know this off topic but Richie are you pullin in a weighted class and if so how's your transfer
is the front end light, how about mph limmit in your class that kills me sometimes. I will somtimes
put fluid in the rear's and it helps. the bad thing about Deere is the tractor is so dang heavy
and the SOB's (some other brands) can get so light and add weight where they want. bla,bla,bla
i could talk about this forever.

[PToombs]

Torque is the '49 R sitting out in the shed.

[Richie O]

I know this off topic but Richie are you pullin in a weighted class and if so how's your transfer
is the front end light, how about mph limmit in your class that kills me sometimes. I will somtimes
put fluid in the rear's and it helps. the bad thing about Deere is the tractor is so dang heavy
and the SOB's (some other brands) can get so light and add weight where they want. bla,bla,bla
i could talk about this forever.

Our pulling club has wheel weights only. We can also fluid up as well, but hanging weights are not allowed. I run 7000 pound class bare bones and put 500 in wheel weights for the 7500 class. In my class the chain goes straight to the drag. We are allowed 18 or 20 inches in hitch height ( can't remember which ) and the chain is the same height on the drag. That means I get no weight transfer. I have never pulled the front up in the higher classes. The 2500 pound class I run the Oliver 60 Row Crop in has the chain much lower and I can adjust the hitch just right and get the front up about 6 inches. I have won 1st with my Farmall 300 as well as the Oliver, but never with the deere. ( still love the johnny popper )