i ono maybe i was wrong..and to tell u the truth i don't really care...myyy anus is bleeeeeedddiiinnngggg!!

 

atv sport may 2004 pg 50
I am standing by my claim that if the raptor was modded with different gearing and allowed a 9-10k rpm limit, it would be much closer in a race

the yfz 450 is tuned for acceleration, the raptor if tuned for acceleration, would perform admirably against the smaller 450

the rpm limit is key, cause the horsepower is higher at 7-10k rpm

but thats when the raptor has to shift and start over again, while the 450 keeps on revving

its all about shift points and rpm's...the raptor has to shift more times and quicker(due to rev limits) than the 450, which gives the advantage to the smaller engine (cause it stays in powerband longer)

again, 2 different machines designed for different applications....the raptor is just not designed for racing, but it has potential to be a good drag racer(it just needs to be modified for that purpose)

 

7000 RPM? heh, it redlines at 9100 RPM stock. And yes, the raptor could take the yfz being the same weigh. 50 lbs is a HUGE difference.

 

nice setup RaptorRcR...

wonder why the magazine writers, always publish BS?

unless all atv's are setup different from factory...lol

guess I won't really know what it redlines at, unless I measure it myself.

9100 rpm's, is that from dyno stock? or is that a quote from somewhere?

 

It says on the yamaha website that the rappy rev limiter comes on at 9000rpm. Either way any rappy owner would know better than to rev their engine to 9000rpm because the power peaks around 6500rpm and he would shift soon after the power peak.

 

after i researched, I have found that the limiter may be around 9k but the power drops substantially after 6.5-7k




dyno with gyt-r exhaust from yammie site above link dyno

dyno of 450 dyno

 

if you want to talk about "what if's" put the 500lb ds's motor into a 350lb frame and it wouldn't even be a race. stock for stock the yfz's and ds's are pretty close, so take off 150lbs and i think it would be a slaughter

 

With just a pipe and filter the peak hp on a raptor jumps to 7500-8000rpm. You have to know what you are running and shift accordingly. With an aftermarket cam you can still be making power at or above 9k rpm.

 

actually, i saw dyno numbers from this months dirtwheels that say the yfz has 40hp stock, and 46 with most pipes, i dont trust it because pipes do not add that much hp, but the base horsepower seems right with that engine, 33-38 like what you guys are saying doesnt make sense, if thats the case they shoulda put the 250f motor in it.

 

quit taking numbers from dirtwheels.