Re: Over reving

[ChrisBourk@xxxxxxx]

In a message dated 98-11-26 17:31:48 EST, you write:

<< 
 Date: Thu, 26 Nov 1998 15:14:19 -0500
 From: mark kibort <mkibort@domain.elided>
 Subject: over rev protection is done by fuel cut off.
 
 Message text written by INTERNET:bmw@domain.elided
 > re: '95 M3 Over-Rev/Class action law suit?
 
 >>>>> "Nick" =3D=3D Nick  <nikog@domain.elided> writes:
 
     Nick> There is no way, read IMPOSSIBLE, that any
     Nick> computer/manufacturer can prevent an overrev due to a
     Nick> mis-shift. =
 
 
 Hmm, why?
 
     Nick> The mechanical coupling cannot be bypassed when
     Nick> the DRIVER puts the transmission into the wrong gear.
 
 How about hydraulic clutch actuator, controlled by DME and trigerred
 by the same input that makes DME store the overrev info.  I've never
 heard of any car having anything like that, however, it seems simple
 (but probably is not).
 
 Gleb<
 
 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>.
 
 Isnt this covered by the  rev limiter that is engaged  when the revs go
 over the certain limit.   (fuel cut off will stop a over rev dead in its
 tracks.  No fuel, no more rev , it is that simple)
 
 Mark
  >>

mark,

Perhaps in eram-land, but here on earth when the driver shifts from 4th to 3rd
(instead of from 4th > 5th) at or near the redline, the fuel shut off has no
control over rpm.  The rear wheels are driving the engine at that point and
the car's momentum provides the fuel.

Christopher

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