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Redline and rev limiter ARE NOT the same thing (archive)
[ Follow Ups ] [ 5-series (E28) Message Board ] [ Msg. Board FAQ ]
Posted by Shawn D. on February 10, 2002 at 22:51:36:

In Reply to: 528e performance ain't so bad posted by Anthony on February 10, 2002 at 19:15:41:

The redline is the mechanical limit of safe engine speed, usually due to the valve train. The rev limiter is an electronic means to keep the engine speed from going past the redline when that engine speed is caused by throttle input; rev limiters work by shutting off fuel, spark, or both. The rev limiter cannot keep you from over-revving the engine if, say, you drop the tranny into 2nd gear at 100mph.

Therefore, if you haven't done any mechanical modifications to the engine to increase the RPM capability, you have not increased the redline, no matter what the rev limiter in the chip will allow.

I was reading my book of 5-series road test and a euro 525e with automatic does zero to 60 in 9.8 seconds. It makes about 5 more hp and torque then US cars. However my 1983 528e has a jim c chip so maybe zero to 60 is about 9.5 sec. which is pretty good for such an old car. One question i have is my redline still is 4500 rpm, the chip did nothing for this. Is this correct? Thanks




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