I am not sure if you guys have played around with the Delivered Engine Torque PID found under the Engine/TQ Management portion of the scanner. I wanted to see if this could net some tangible results. I have tried using the Delivered Transmission Torque, but I don't think it is as "accurate". Using the Tq -> HP formula and applying to this PID, I was able to make some logs this morning to verify the results. For my cars specs see below. I locked the transmission in 3rd using the Bi-Directional controls and made a pass from about 3000 rpms to about 6200 rpms. The results were 454 delivered flywheel torque at 4000 rpms and 412 calculated flywheel horsepower at 5500 rpms. Now I know my SS has run 105.11 MPH at a local high elevation track (LACR for you locals) as driven on the street (no slicks or drag radials), and given that a 4L60E has about 18%-22% drive train loss, I should be able to calculate some rear wheel horsepower numbers. But will they correlate? Given the weight of my car currently, and based on the trap speed (I use an excel calculator that works very well with our cars, and it has been proven to me based on my results), the calculated rwhp from my trap speed is ~340 or so. Now if you apply the drive train loss percentage to the Delivered Engine Torque (and my custom PID: Calculated Engine Horsepower) we get 372 "rwtq" @ 4400 rpms and 337 "rwhp" @ 5500. Wow, pretty good! I will substantiate these results soon on a Dynapack dyno, obviously they will differ, due to no "ram air" affect on the FTRA. At least this can calculate if you have gained anything from the previous round of mods. Granted, like all dynos, this is only intended as a tuning tool. And just like a dyno, the numbers are a little choppy, but surprisingly smooth compared to raw dyno data. I will post the log file tonight, as I conducted this while on my way to work, and I do not have a USB nor a means of transferring data from my laptop to another computer.
Car Specs:
2001 Camaro SS
HPTuned via AEM
FTRA
GMS Lid
Ported TB
Stock 2002 LQ4 Long Block
Hooker LT, ORY & Catback
B&M 3000 Stall
3.73 Gears
Auburn Pro Posi
Weight (w/Driver, full tank) ~3800lbs
Otherwise factory stock
I also made a custom PID that calculates Torque Converter Efficiency. It calculated my B&M 3000 at 97% on the top end, pretty darned good.