This is a good posting. After reading the article and looking at the numbers, I find hard to believe anyone one would change out the pistons and cams based on the results of these numbers. When we tested our Fuggin Fabrication Viper-2 pipes we Dyno’d at 64.9 HP and 80.9ftlb of torque at 3600 RPM. The only changes we made were the Air-intake, Viper-2 pipes and the Fuggin EFI fuel controller.
Granted we did not see the same horse power gain as shown in this chart, but we did not push the RPM limit to show 71.25HP. And if you notice the torque has dropped off to about 71ftlb of torque. (The same as stock at 3100 RPM)
When you are reading dyno charts that are posted like this, you have to be careful with what they are trying to sell you on. When you look at all the RPM ranges they are showing to reflect higher numbers, what are they really selling you?
Most riders today ride with-in 2200 to 4200 RPM thru all the gears and that’s where you want your numbers to come from. If you can drive up the horse power and torque with an Air-Intake, exhaust and fuel controller in that range of RPM, than why put cams and pistons in? Horse power is not really the factor here, torque is. Torque is what a rider feels when the throttle is twisted, what you feel in your butt being push back in the seat, pulling you away from the grips.
Be aware of what you are looking at when you see dyno charts like this. Make sure you are reading all the numbers and what they may be trying to sell you. The dyno charts we have posted on our web-site are actual photo’s of the dyno run. They show the results of just changing the Air-filter, exhaust to the Viper-2 and a Fuggin EFI Fuel Controller. (64.9HP and 80.9ftlb of torque) Compare the numbers.