Speed Tests 7.2v vs 4.8v

[FociD00d02]

I'm going to get a speed test today of my supra the only thing is doesn't have are bearings. I'm considering doing the "differential" mod but I dont know how or what to do. I'm going to measure off about 22ft in my driveway and just go at it. I'll line up the car go and start the watch. I know the results won't be 100% accurate but it will still give an idea of what type of performance that it gives us with 6 AAA's instead of 4 AAA's.