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540i Chip and differential ratio change (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by Ron M on September 19, 1999 at 17:58:24:

I have a 1994 540 auto and am considering two performance mods - a JC chip and a lower differential gear ratio. I live at high elevation in Denver and am curious if the JC chip really does much up here. Also on the lower diff ratio I have the following questions:

1) Is the speedometer affected? If so, can some compensation be made?
2) Are gears available or do you have to go with a whole new differential?
3) Would the auto trans be affected?
4) Is it worth it? Because of the power loss here I'm looking for acceleration improvement but would be open to other ideas (a $7500 supercharger is not an option right now).

Any experience/knowledge would be greatly appreciated. Thanks.

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