OT max economy, engine stress

[Todd....!!]

Just FYI,

I drove my uncles Viper Roadster a couple a years back.

I drove it for about 30 mins to an hour, with my Dad in the car with me
with a vid cam pointed at me most of the time...  

Anywho, I actualy shifted the car into 6th gear at under 30 MPH and
floored it!  It didn't diesel or shutter or anything bad, it was just a
SUPER major D-O-G, I don't remember what rpm it was but you can guess
that it was a TAD under 1,000!!

Just FYI!  NOT DIY_FI but plain old FYI (For Your Info)

Sincerely!,

Todd....!!
--------
Bruce Plecan wrote:
> 
> ----- Original Message -----
> From: William T Wilson <fluffy at snurgle.org>
> To: <diy_efi at efi332.eng.ohio-state.edu>
> Sent: Tuesday, May 04, 1999 4:38 AM
> Subject: Re: OT max economy, engine stress
> 
> "Lugging" an engine till it shutters, ain't good.  The shutter is usually do
> to the tune-up being off.  Many tuners don't allow for vey high load/low
> rpm, goes back to carb days.  As a test of a calibration I sonsider it right
> if at 1,200 rpm or less I can hammer it and it pulls cleanly.  The above is
> for a streetable engine, meaning say less than .5" 300d 0 lash.  Some big
> cams, in heavy cars can't be grief.
>     The "bad" thing about shutttering is the engine stops, and then resumes
> for a moment with no oil presssure.
> Bruce
> 
> > > My question for y'all is whether I ought to be concerned with
> > > what I have always been told is very hard on an engine - asking it to
> > > do a lot of work at very low RPM.  My car doesn't really "like" to be
> > > lugged below about 2000 RPM, depending on load.  It shakes and
> > > shudders if I load it down to heavily, although it does continue to
> > > pull.
> >
> > If your engine is shuddering, you should downshift.
> >
> > Some engines (most diesels, GM Lx1 series V8) will pull like mad more or
> > less from idle.  It really takes an effort to lug these engines.
> > Fortunately, the Trans Am and, I think, Camaro of recent years have an
> > "engine lugging solenoid" which forces you to shift into fourth gear at
> > about 20-25 mph. :}
> >
> > The 3-cylinder engine in my Geo Metro has the world's strangest torque
> > curve, and doesn't mind being lugged at all.  For a small engine, this is
> > highly unusual, IMO.  Nevertheless, it's ready to go at 1500 RPM.  This
> > is, I'm sure, part of why it gets 45-50 MPG.  :}
> >
> > > Am I beating the bottom end out of the engine?
> >
> > Well, you aren't doing it any good.  Just don't lug the engine.  It serves
> > no purpose and, although most modern engines will put up with it (and a
> > variety of other abuses) without too much complaint, you accomplish
> > nothing by doing it, so don't.
> >
> > > Also curious about heating the fuel to improve economy.  Worth
> > > half a damn?  Any words of encouragement or caution?
> >
> > Useless on fuel injected engine, IMO.  May obtain some benefit on setup
> > where fuel is vaporized.  Fuel injection system atomizes fuel and hot fuel
> > will do nothing except (marginally) increase risk of detonation.
> >