Bulldogz400 is the only one who understands math, obviously. If you put a sheet of plywood on the front of a z, it will not achieve top speed, and thus will not hit the rev limiter. But if you did have enough power to hit the rev limiter, it would be the same top speed as a z without he plywood. By the way ImBack, how many "kids" you know with an associates degree in the Air Force?Is your truck an auto or manual? Automatics rely on fluid to transfer power from the engine to the tranny, where manuals rely on the mechanical clutch system. But try this, see how many rpms a manual tranny truck needs to maintain 55mph, then throw a trailer on it, and see. rpms of the engine translate directly to rpms of the wheels. The circumference of the wheel relates directly to how many feet per min you go reguardless of weight and resistance. When I said weight and resistance have little to do with top speed, I was refering to a z with a rider that can hit rev limit. If a rider can't hit 70mph, then he's not hitting 8500rpms is he? The engine will not turn faster than the drive wheels will allow and vice versa.

 

sorry appx 28 but still that can't be right. and with quads 1 or 2 numbers off does matter when your talking horse power

 

All this talk about wind resistance. Guys what ever happend to friction? That's a very powerful force that limits the efficiency of simple machines (such as the wheel and axle on the fourwheeler and then there's also the chain and sprocket). Why do you put oil (or WD-40) on your chain and sprocket? It lowers the amount of friction and increases efficiency.

 

To relate that to Physics, it's calculating top speeds assuming friction and wind resistance (is that a form of friction?) are negligible.

 

Well having a degree is the least of my concerns right now, i dropped out of college to run our family business and am doing pretty good...

I have read some pretty ignorant posts on your part when it comes to ATVs, i guess having a degree didnt prevent you from missing out on a few things.If you were that knowledgeable you would never ever had made a post like this one;

Someone as "smart" as you seem to think you are would know and understand why you will never get a stock Raptor to hit 100mph no matter what gearing it is running...In fact you will never get a stock Raptor or any other sport quads on the market today to hit 100mph with gearing changes and a different rev limiter,they just dont have the power to do so.Put a 15 teeth front sprocket on a stock Banshee and it only picks up 3-4mph instead of the 7-8mph it theorically should. Why? The engine aint powerfull enough to reach the same rpm level it does with the stock 14 teeth sprocket.Why? Wind resistance or drag or whatever you want to call it and since wind resistance grows exponnentially with each mph you try to gain it just gets harder and harder to go faster.

Let's say a certain quad is able to hit 75mph in stock form (stock form meaning you changed the sprockets but nothing else),you mod the engine and add 10hp you now are able to gear it higher and gain let's say 10mph.Do you think 10 more hp is all you will need to allow your ATV to gain another 10mph? Nope you may need 20 this time and the time after that you may need 40hp and all and all...

I dont have a degree but i know a few things when it comes to making a quad go faster...

 

Not exactly, calculating top speed in spite of resistance. They're not negligable, just not a factor cuz they're not enough to keep you from hitting the preset limit already in place on the machine. If the cdi was not a factor in the determination process, then friction and resistance would factor in, but this not the case. Top rpms of engine x gear ratios = top rpms of wheels,rpm of wheels x linear dimension of tire circumferance x 60/5280 = top speed in mph. So a better question than what is top speed of a z would be, how many rpms can your engine turn with you on it. If your quad can't reach top speed due to weight, resistance, etc., then it can't reach top rpm. Why is that so hard to understand?

 

I just posted something a minute ago, but sadly it didnt get approved, there were some "forbidden words" in it for you craZ. Anyway, if you guys want to argue about all this crap, and tell me that my numbers are wrong, then why dont you just post your own numbers? Afraid that somebody will tear them down like they sometimes do with mine? Btw craZ, if you want to drag and let me put your punk-@$$ where it belongs I'm available most of the summer, just PM me. Although it might be a long drive from Alaska to Oregon. Come to think of it, maybe the fact that you live in Alaska has something to do with your attitude, all that isolation from large groups of other atvers has gotten to your head. Just a little quote for you to think about craZ, "The numbers only go down if you don't turn the graph upside-down!" I think somebody as smart as you can figure it out.

 

If weight and wind resistance have little to do with top speed, then peanut butter and jelly have little to do with a peanut butter and jelly sandwich.

 

Do i **** you off.

 

Ok we are all basically agreeing on the same things! Let's straighten this up...

YES-Wind resistance DOES play a factor on top speed if that the resistance is enough to disable the quad from reaching its maximum RPM's that it may normally reach.

YES-If a motor does not have a rev limiter, per say a Banshee, these resistances will ALWAYS affect the ability to reach the speeds it may have been capable of say the day before with less/no resistance. My quad, however, has a rev limiter at 10,500RPM, and if reached at any time I am going as fast as I can go. Now a day with 15MPH wind going with me may help me get to this limiter faster, but with a 15MPH against me it will take me longer, but in the end, going the same speed AS LONG AS IM ABLE TO REACH THE SAME RPM'S!!!! I may only be 17 but this is one thing I am sure of...

Easy enough???

Russiankid- Nobody cares