Ok I've been searching, but I am not liking my results.


My brother-in-law, and I went to Exposed today, and finally got to settle the score at the drag strip to see who's quicker. He has an '04 xB w/ a manual, I have an '06 manual. His mods are drop in K+N, header + cat-back, where as I have a drop in K+N, header + axle-back. The only other difference between our cars are wheels. He has 18x7 with 225s, I have steelies with 185s. 1st and 2nd gears we are nearly identical acceleration wise, but once we hit 3rd, he pulls on me. Best he, and I could muster was him a 17.2, to my 17.8. A short while later we hit the dyno that was set up in the garage. I went first, and put down a respectable(to me for what little mods I have) but modest 88whp and 99wtq. Expecting him to have a little more power due to his quicker 1/4 mi times, he went, and low and behold, his xB was only able to muster 87whp and 94wtq.



All driver mod jokes aside, my question is this. Did Scion change gear ratios between 04 and 06? As previously stated we are almost identical in speed till around 60mph(3rd gear change) and he just starts to pull me. I can not for the life of me understand how and why this would happen, scientifically speaking. Especially knowing I am lighter, and possess slightly more power. I know his wheels will change his gearing slightly, but wouldn't it slow his acceleration, not increase it?

 

Would be interesting to compare the dyno graphs to see at what RPM your torque and hp peak.