Hey I just took my raptor 700 to the dyno today, my mods are listed below
stock my 700 did 37.43rwhp with my mods 44.27
stock my 700 had 33.10 pounds of torque after mods 40.58
now my shop up here that did my dyno also has a modded 700r with full gytr exhuast with header, gytr intake and no airbox lid with power commander and it does 40.34rwhp
so what I have to say is I am impressed with my alba mods
there is one spot in my fuel curve where it drops off so my service tech thinks if I remap it I can get some more power out of it, but all in all he says the fuel curve is pretty good
note dyno runs were done at 2954 elevation not sea level
top speed 81 mph

 

those numbers seem kind of low to me. Did you run stock knobbies? If so, that is why the number part is off. Either way, looks like you gained some good power!!! Good job

 

I was curious about the tires to, 135.

I actually think 44 hp and 40 lbft is quite good at 3000 ft elevation. That should be good for a 10% power loss whouldn't you think? I bet at sea level the machine would be real close to 50 hp.

As the man said though, good gains!

Ron

 

...........maybe

 

Most dynos have a corection factor for altitude. Flat track tires definately would have made a diffeence. Nice numbers just the same[img]i/expressions/face-icon-small-smile.gif[/img]

 

After allowing for altitude and the tyres it is still an impressive gain, was the dyno run with stock tyres? have you given it the real test and gone for a ride, thats a big torque increase?
Gav

 

i dont mean to be stupid, i'm just trying to learn something new...my question is, what makes the horse power more/less at different altitudes...does it have anything to do with the amount of air that can be sucked in or something else?

 

Simple answer is yes!

Detailed answer:
Air isn't what decreases power at higher altitude. . . less OXYGEN is what leads to reduced power at altitude.

As you go up in altitude the molecules of oxygen in air become less tightly packed (i.e. further apart). As a CFM (Cubic Foot per Minute) of air flow (how it is typically measured) moves into the cylinder there are less molecules of oxygen in the cylinder. Combustion occurs between molecules of oxygen and molecules of gas. If there is less oxygen you need to de-fuel to prevent a rich condition (too much fuel).

In burner combustion the de-rate for altitude is about 4% per 1000' ASL (Above Sea Level) - Usually the de-rate doesn't start until you reach about 1000' or 2000'. So, at 3000' de-rate should be about 4% to 8% (that is if de-rates on engines are the same as boiler de-rates.

 

Those numbers seem appropriate to me. Every 700 I rode has been dissappointing in the power department.

3000 ft isn't that high of an altitude.

Does anyone else have any 700R hp numbers to compare to?

 

bump what master says, teh few i have ridden were disappointing, with pipe, and commander units. dynoed at 50hp. came out of teh hole great, but for some reason they dont like going up the hill. Sticking with my 660r.