This is from the Injen CAI...

http://www.injen.com/webpages/testin...les/RD1985.gif

What I can deduce from common sense is..

a) The lower blue/red set of lines is the torque curve. Blue is original, Red is with the Injen. Maxes listed in numbers correspond with the peaks of these 2 lines (220 and 225, using right y-axis for the numbers).

b) The upper blue/red set is the HP curve. HOWEVER, the graph says "Max Power 228.8" in Blue, and "Max Power 232.8" in Red. The 228.8 here DOES correspond with the left y-axis for HP, at the peak of the blue line. But the 232.8 makes no damn sense. The peak of the red upper curve is, measuring by the LEFT horsepower y-axis, about 240!

Am I misreading the curve in some way ? No other reading of the curve seems to make sense to me.

 

The lower set of lines (where they are low in the bottom left and high in the upper right) have to be horsepower. Horsepower measurements almost always are low at low rpms, then rise continually to some peak rpm.

Torque curves, on the other hand, are usually relatively flat. They kick in early and tend to hold approximately that same level until they gradually fall off.

 

hp is on the left and tq is on the right. so if you look at the higher red line ( the one that starts to drop off as RPMs get higher) it shows that it is at 232.xx for the tq, which is measured on the right side . took me a while to figure out dyno charts too. not used to having to measurements on one y-axis.


Doc

btw.......that looks like a somewhat ill running Z. most of the dynoes that i have seen show hp in about the mid 230 to mid 240 range.....

 

Ahh,

JReiter... that seems to make sense now..

DrRick, torque is never 232.xx, because if you look on the right y-axis, you'll see that torque goes in increments of 2, instead of 5, like horsepower. Maybe that's where you made your mistake? =)

Also, JReiter's explanation that HP is the lower set of curves, and torque is the higher 2, makes perfect sense. And the numbers match if you use both the right and the left y-axis scales correctly.

I can now see that... at most RPMs, you get about a 5 horsepower increase... which increases to almost 10HP when you are within 5250 - 5750 RPM range, and simmers back down to 5.

And torque, according to the right hand y-axis and the upper set of lines, is increased an average of 8-10 ft-lbs throughout most of the RPM range. Torque actually decreases between 5000-5250 RPM and 5750+..

All is clear now

-slay

 

my bad, i put down the wrong number. i meant to say 224.x. it would prolly be easier to read with two separate graphs as the colors dont change when you try to plot them together.........