Choosing the Right Ratio


This chart should assist you in selecting the right ratio for your vehicle. Only popular models are covered. For other vehicles, contact me if you need assistance.


BMW E30 - 318i / 318is Manual 5sp
Better Fuel Economy: 3.46:1
Standard: 4.10:1
Faster: 4.27:1
Fastest: 4.45:1
BMW E36 - 323i / 325i / 328i Manual 5sp
Better Fuel Economy: 2.93:1
Standard: 3.15:1 or 2.93:1
Faster: 3.46:1
Fastest: 3.64:1
BMW E30 - 320i / 323i / 325i Manual 5sp
Better Fuel Economy: 3.07:1
Standard: 3.45:1, 3.64:1 or 3.73:1
Faster: 3.91:1
Fastest: 4.27:1
BMW E36 - 318i / 318is
Better Fuel Economy: 3.07:1
Standard: 3.45:1
Faster: 3.91:1
Fastest: 4.10:1
BMW E46 - all
Only one ratio is being built at the moment: 3.46:1.
This is the lowest (fastest) ratio available for E46 right now.