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Tractor Pulling Discussion Forum

What point does hp lose effectiveness when pulling

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Just a thought

02-28-2008 08:47:46




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ok here goes...


If you are set on pulling a certain gear and have the power to turn that gear, would more hp help any? even if you are not going to go up a gear. if so how much hp would help 5hp? 10 hp? 25 hp?

will it out pull the same tractor, same setup (tires/weight and balance/tractor) down the track with less hp? assuming the same track (line) conditions can be acheived.

This is just a thought, no speed limit factored in, assuming running gear X with full throttle.

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ChadS

02-28-2008 19:07:12




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 Re: What point does hp lose effectiveness when pulling in reply to Just a thought, 02-28-2008 08:47:46  
DW,,, ya said it right on the money. How many times did that B of yours lug down and grab a bite, where the hot rods spun em out??? too many times!! You can have X amount of power, but even that huge X amount of power and it can hurt more than it does good,, against a good driver who knows their machines and how to drive em. DW put me to the test to that,, They Won!! Less can be more. ChadS [email protected]

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tomtom34

02-28-2008 16:42:23




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 Re: What point does hp lose effectiveness when pulling in reply to Just a thought, 02-28-2008 08:47:46  
the old saying... no kill like over kill. more than enough horsepower never hurts



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JDTH

02-28-2008 12:23:04




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 Re: What point does hp lose effectiveness when pulling in reply to Just a thought, 02-28-2008 08:47:46  
With this thought in mind, what would be the most efficent means of controlling HP, Throttle, Timing, etc.?



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mlpankey

02-28-2008 13:14:04




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 Re: What point does hp lose effectiveness when pulling in reply to JDTH, 02-28-2008 12:23:04  
throttling back and or pulling against brakes



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mlpankey

02-28-2008 11:28:45




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 Re: What point does hp lose effectiveness when pulling in reply to Just a thought, 02-28-2008 08:47:46  
well it is my opinion and only mine . so here it is no matter what gear youre pulling in and no matter what speed if the sleed slows youre mile an hour down before youre at the end of the track then you have a lack of horsepower for that gear in that weight class



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slow puller

02-28-2008 10:47:16




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 Re: What point does hp lose effectiveness when pulling in reply to Just a thought, 02-28-2008 08:47:46  
I have actually seen on a hard dry track where the open or div. 5type tractors just spun there wheels and couldnt get the sled up to speed .Some of us slow pullers pulled it farther at the same weight.



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WTW (Just an Answer)

02-28-2008 09:54:11




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 Re: What point does hp lose effectiveness when pulling in reply to Just a thought, 02-28-2008 08:47:46  
This is just my opinion based on my experiences for what that is worth. If you are set on pulling at a given (slow) speed and have enough HP to break or spin your wheels loose extra power in that scenario is not going to help. If you can make changes / adjustments to improve your traction to where you run out of power of course extra power will be a big factor (No Brainer There). Winning slow paced low gear pulls is usually not about who has the most hp rather more about set up, traction, the ability to maintain traction and enough HP, not extra or power to spare. Extra Hp not used correctly can actually hurt you in slow paced classes. My common advice to folks who ask how much power do you need is: To be competitive you must have enough power to pull the maximum amount of speed that class will allow in all conditions. If you are pulling slower than the allowed speed somebody sooner or later with his tractor set up and dialed in (just like you may have) will most likely out perform you at a faster speed. Speed is a big advantage if all other factors are the same. Where the slower paced tractor will beat the faster paced tractor is when the faster paced tractor isn't set up correctly for the speed he is pulling. I know you did not want to factor speed in but if you do not you are/will be at a disadvantage. DW

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ToddF

02-28-2008 09:28:01




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 Re: What point does hp lose effectiveness when pulling in reply to Just a thought, 02-28-2008 08:47:46  
In theory if there is HP to provide torque enough to spin the tires at maximum traction conditions, more HP is not only unnecessary, but unusable given a fixed gear. The result is that the governor will cut the fuel to prevent overspeeding of the engine. From a design standpoint you would prefer to have the ability to produce power enough to spin the wheels rather than power out, so a little more power than necessary for the maximum traction condition should be the design goal.

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MN Dave 2

02-29-2008 17:59:27




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 Re: What point does hp lose effectiveness when pulling in reply to ToddF, 02-28-2008 09:28:01  
just adding my 2 cents worth to some good replies...

As I was sitting on my IH400 last summer while it was getting hooked to sled in the 8500# (which is max for me), I thought why am I even in here, all I did was throw my entry fee away and besides will probably get embarrassed to boot. I was the only red tractor in class while rest of class were 720, 820 and 80 green guys, all of who were good pullers.

To make long story short, I was the only tractor that needed a lot of weight to make class and who didn't have enough power to spin out in the large hole that had developed in track and won class by 25'

IF you do have an over abundance of power, you can always throttle back and try to get tires to re-hook.

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