Also....I agree with you about the one Dyno that was posted. 211whp means a 20% drivetrain loss.....That is a lot. Rear wheel drive is generally anywhere from 10-15 % loss. 20 is way high.
In fact, here is an article that quotes a white paper from the Society of Automotive Engineers (SAE) with regard to drivetrain loss. In rear wheel driver vehicles you are talking as low as possibly 6% drivetrain loss. Here is a link:
http://www.superstreetonline.com/how-to/engine/modp-1005-drivetrain-power-loss/Here is a good quote from the article:
"Within the drivetrain itself, the primary loss sources are the differential and final drive, with further losses stemming from within the transmission, and in the case of AWD vehicles, from the transfer case. Within the transmission, as much as 30 to 40 percent of power loss can be attributed to the pump, with the clutch contributing another 20 to 25 percent. The rest of the loss within the transmission comes from seal drag, gear meshing, bearings, bushings and windage (drag on the gears caused by the gear oil). However, when dyno testing in the direct drive (1:1) gear, power is delivered directly through the mainshaft of the transmission, so the only loss sources are windage, friction and drag, resulting in total at-the-wheel losses as low as 1.5 to 2 percent, according to the published data. Differential losses tend to be considerably larger, especially in the case of RWD and AWD vehicles where the torque path is turned 90 degrees as it enters the rear diff and exits it toward the rear wheels. In the case of hypoid-type gearsets (where the gear tooth profile is both curved and oblique) that are commonly used in RWD differentials, losses in the 6 to 10 percent range are the norm, while loss from the driveshaft(s) and prop shaft(s) tend to account for about 0.5 to 1 percent of total loss, depending on how well they're balanced and how many the vehicle is equipped with. In the case of FWD vehicles, the torque path is more direct to the front wheels and the use of efficient helical final drive gears means that drivetrain losses can be as much as 50 percent lower than on RWD and AWD vehicles."
I've also seen a number of stock dynoed Sky Redlines and Solstice GXPs that have dynoed in the 220 to 225whp range.
Regardless....that's not what we are talking about. This is just a good comparison to see the ACTUAL benefits of a highflow or gutted cat on a Redline/GXP's performance.
