AVR-Chat

32LBS!  Wow thats alot of boost.  I run my chevelle on 18 lbs, and 
thats as far as I dare go.


--- In AVR-Chat@yahoogroups.com, "fnatmed" <fnatmed@y...> wrote:
> --- In AVR-Chat@yahoogroups.com, "William Nachefski" 
> <slaphappysamy@y...> wrote:
> > --- 
> > I guess the 200,000 rpm gave me away.  Yes this is for a jet 
> engine, 
> > but not a model.  Its a rather large homegrown one.
> > 
> > In AVR-Chat@yahoogroups.com, "Jesper Hansen" <jesperh@t...> wrote:
> > > > I am just getting started into AVR's.  I am seeking help on a 
> > > > circuit.  I need to build a tachometer with opitcal pick up.  
> The 
> > max 
> > > > RPM to be counted will be around 200,000 RPM.  
> > > 
> > > Hmmm. Playing with model jet engines ? ;-)
> 
> It doesn't *have* to be for jet engines :)  I'm looking to do the 
> same thing, but it's for tracking the speed of the compressor 
wheels 
> in a vehicle turbo.
> 
> On the track at 32lbs of boost, loading can spike the turbo speeds 
> pretty nastily, which leads to rapid failure.  I need a way to 
> monitor turbo speeds to modify the fuel delivery system etc etc 
blah 
> blah.
> 
> I've seen the results of a #2 turbo grenading and spewing bits of 
> chrome-vanadium steel down into the intake.  The pistons, valves, 
> etc, were not at all happy about this state of affairs.  Not my car 
> thankfully, but ugly nonetheless, and I don't want it happening to 
> mine.  I currently stay below 28lbs, but those 32lbs pulls on the 
> front straight are incredibly addictive :)  Gives new meaning to 
the 
> word whoosh.
> 
> Dean.