Re: Loading up?? (was S6 vs 850)

["Arun Rao" <rao@quattro>]

On Aug 29,  9:32am, Edward T Spire wrote:
> Subject: Re: Loading up?? (was S6 vs 850)
> >From: "Arun Rao" <rao@quattro>
[....]
> >	Actually, if you try the test in *third* gear, it's even more
> >	interesting. If you stay on the gas for several agonizing seconds
> >	[...] it *will*
> >	eventually make its peak torque rating at the specified rpm ....

> Can anybody explain what's going on here for me?  What exactly is
> happening in the engine to cause this "loading up" you describe?


	Just an extreme case of good old turbo lag, as I understand it.
	Takes a while for the turbine to accelerate, especially at low engine
 	speeds, when exhaust gas flow rate is low. Provided that the
	turbine rotor has a sufficiently moment of inertia (small turbo),
	this will  be a positive feedback process, and the torque developed
	by the engine will increase.

	I feel confident that I'll be corrected by the Wise Ones Of Coimbra
	if I have erred in my explanation :-)

	-Arun

--
Arun Rao
Pixar Animation Studios
Pt. Richmond, CA 94804
(510) 215-3526