MSD 6A

[Kevin _]

I personally do a lot of work with NASCAR (specifically the Dodge guys).  
There are 2 boxes for 2 reasons.  Some teams are worried about failure and 
have the 2nd as just a backup.  More commonly, there are 2 boxes to have 2 
revlimiters, one for normal operation and one for pit lane.  They don't rev 
higher on the last lap - they set up the gears in the car so they're in the 
proper rpm range for the track and they're always in 4th gear (except pits 
and restarts).

NASCAR mandates what ignition boxes can be used in the cars/trucks.  They 
only allow a few boxes (actually maybe just 2) and they don't have 2-stage 
revlimiters.  That's the main reason for 2 boxes.  Yeah, its weight and 
space inefficient, but hell, they weigh 3400lbs w/o driver and have parts 
from 60's cars.  Go figure.

Kevin

>
>Why would you need two boxes to turn the rev limit off?
>
>You can use a 2 step module and put a toggle switch for Rev limit, No Rev
>Limit.
>
>They probably carry two for redundancy, and that less then 1K per box, 
>thats
>a pretty cheap backup system.
>
>-----Original Message-----
From: Bruce [mailto:nacelp at bright.net]
>Sent: Tuesday, November 27, 2001 3:15 PM
>To: diy_efi at diy-efi.org
>Subject: Re: MSD 6A
>
>
>
>It's only the last lap that counts, the rest is for customer appeal.
>Last MSD box I saw had the rev limit in it (granted was awhile ago)
>Bruce
>
>
>
From: "David LaRoe" <davidlaroe at home.com>
>Subject: Re: MSD 6A
> > Most NASCAR do carry two. One with rev limiter and one without.  Why do
>you
> > think that in the final laps that the times improve so much?  They
>switched
> > to the other box.
>
> > From: "justin ivan" vlkslvr at hotmail.com
> > Subject: Re: MSD 6A
> > > I've got an MSD 6A and so far it's been adequate. Had a problem with 
>the
> > > tach adaptor that took a while to figure out. I have heard of some
> > > realability concerns though and I heard somewhere that a lot of racers
> > > (NASCAR perhaps) run at least two MSD's so as to hav failover. Now 
>this
>is
> > > probably just cheap insurance but does kind of question the quality of
>the
> > > box.
> > > Again I've had no problems with mine to date but rumor mill does
>indicate
> > > that there is potentioal
>
>
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