New oem vw jetta, golf, and beetle 02m 4 AUDI TT A3 8L 8N VOLKSWAGEN GOLF. Automatic transmissions will run at a slightly higher RPM and applications with an overdrive transmission will run with slightly lower engine RPM.įirst locate your current gear ratio and tire diameter and then find your approximate RPM at 65 MPH, then reference your new tire diameter with your desired RPM to find the new gear ratio needed. The following are from my 02J (EGR code) transmission before the ratio mods. Choose your transmission: 5th gear option: Stock 0.622 0.658 0.681. This chart is based on a drivetrain running at a 1:1 gear ratio at 65 MPH using a manual transmission, meaning the transmission and transfer case are passing power through from the engine at a 1:1 ratio without any overdrive or reduction before it reaches the differential. VW TDI 02M/02J/02Q Gearspeed Calculator & Comparator (v2.0) Choose your tire size: NOTE:You MUST select 'Custom' in the appropriate pulldown boxes if you want the script to calculate your defined items. Combining this 3.36:1 final drive with the close-ratio transmission will. In the picture to the right, the smaller gear (known as the pinion) has 13 teeth, while the second, larger gear (known as the idler gear) has 21 teeth. (in.) Gear and Roadspeed, mph Jump' between gears, mph Code Main- shaft Brg. This would yield a theoretical 3.33which is close enough to the nearest available final drive ratio of 3.36:1. The gear ratio is the relationship between the number of teeth on two gears that are meshed or two sprockets connected with a common roller chain, or the circumferences of two pulleys connected with a drive belt. The chart below will assist you in finding your new gear ratio needed to give you optimal performance. To find the ideal selection, multiply the final drive ratio by the redline speed in fourth gear (152 mph) and divide that by the top track speed (140 mph). Gear Shifter Cables: Include 6 Speed Clutch Fluid Line: Include Auto-Manual Setup: Include Gearbox Code: Required Long Ratio (ERF / EFF / FMH) Clutch and. Whenever you change tire size, there will be a direct effect on power and driveability.
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