DIY_EFI Digest V5 #840

[Bruce]

Yes, I'll gualify my statement to the stage of depending on dyno, and the
tuner present you can get close.  But, you still can't duplicate air flow
under hood like the real world generates without almost having a wind tunnel
involved.

In doing on the road highway timing trim numbers, it takes at least 10 mins
for the MAT temp to change and restabilize, on my car.
Bruce

From: "Clare Snyder" <claresnyder at home.com>
Subject: Re: DIY_EFI Digest V5 #840
> > Date: Mon, 25 Oct 1999 13:52:53 -0400
> > From: "Bruce" <nacelp at bright.net>
> > Subject: Re: eectuner
> > Is he totally relying on chassis dyno for the perfect tune?.
> > It almost sounds that way.
> > Sure hope he's got money.
> > Dynos generally make a run alot faster, or under simulated loads, and
can be
> > off by quite a margin.  Hope he does some in car tuning before calling
it
> > done.
> > Bruce
> Depends a whole lot on the Dyno. An inertia dyno will be an uphill battle,
but a
> good eddy current or Hydrodynamic "rolling road" dyno can get you REAL
close,
> with a lot less fuss than running on the road or the track. If you can
program
> in the wind resistance and weight figures for the vehicle, you can
simulate the
> increase in drag with speed, going up hills, acceleration from a dead
stop, and
> endless other scenarios.


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