rev limiter

[nacelp]

I built a traction control system and did an ignore every 7 then 5 then 3
cylinder fire fire set up for progressively controlling the engine rpm gain.
I really doubt that you would have to turn all the ignition off, to be a rev
limiter.  Also, no fuel means, no heat, and will try to cool the exhuast,
and not what you want to keep the turbo spun up.  Dropping some ignition
pules loads the exhuast with fuel and any afterburning will light that, and
help keep the turbo spun up.  the banging that is *hard* on a turbo us when
the butterfly is downstream of the turbo, and there is no bypass valve.
Grumpy



> [-------------- snip --------------]
> >  I see what you're saying now. Each miss is equal to one pump of
unburned
> >air/fuel in the manifold/exhaust system/turbo. More misses=bigger bang.
> (light->bulb on above head)
> >
> >  I'm kinda handy with a soldering iron, but new to making radio-shack
> gizmos. >I might try to make something from a 555 timer that is adjustable
> for percent >of miss. Any hints for a newby are welcome.
> [-----------------------------------]
>
> Here's something that just popped into my head as I was reading this mail.
> Basically, you want a rev limiter, but you don't want the 'banging' to
occur
> in the turbo.  Here's something that you could implement:
>
> If you're controlling your own injection (meaning that you've built your
> ECM, and you can reprogram it), you might be able to solve the banging
> problem permenantly.  If your engine/ECM utilizes SEFI (each injector gets
> an individual pulse), you could have the ECM miss __BOTH__ a cylinder's
> injection of gas, AND spark.  This would cause the cylinder to simply
> compress air from the lower/upper manifolds, but wouldn't throw a spark to
> it.
>
> Doing this would result in one full cylinder of air to be dumped out into
> the exhaust manifold, but it wouldn't have any gasoline it in, which means
> it wouldn't ignite further on down the line (causing the banging).  This
> method of rev-limiting would cause the O2 sensor to pick up more O2 than
> normal, which would make it think it's running lean, but -- this shouldn't
> really matter, as you should be at WOT, which means that the ECM ignores
O2
> readings.
>
> Just an idea.
>
> Joel
>
>
> Joel A. Mello
> Email - Mr-mello at excite.com
> Phone - (775) 265-4380
> Web - Http://homepages.go.com/~joelmello/
>
>
>
>
>
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