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lowering the rev limiter? (archive)

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

Posted by Luc on March 30, 2000 at 05:05:48:

In Reply to: Re: Spinning the engine a lot faster than normal? posted by RussC on March 29, 2000 at 10:18:21:

Okay, I just wanting to make sure you meant that the redline is reached quicker with a supercharger installed and not that the engine is running more rpm. The phrase you wrote was somewhat confusing.
I'm afraid I can't go along with your comment on lowering the rev limiter on SC applications. If you need to do this to prevent the SC from overreving, there's definetely a problem with the set up. A SC can't overrev if you got the pulley ratios correct.
If you choose a pulley ratio to obtain lots of boost very low down, then you obviously will have your SC overreving at redline.
It may be that the SC is too small for the amount of boost/power you're demanding. If the SC only starts building boost when already spinning at
20-25 000 rpm then there's not much needed for overreving it at 35-40 000 rpm (Vortech supercharger as example).
Limiting the rev limiter is a bad way of trying to fix a problem that's caused by badly chosen pulley ratios.

How many rpm do you think are cut back? A few hundred? Why would you want to decrease your rpm range, limit your top speed in top gear and in every other gear as well?

Please correct me if I'm wrong on this. I'm keen to find out if there's another reason for doing this.
Luc.


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