[Diy_efi] Intake manifold flow testing

[Dave Dahlgren]

I would never use it for any kind of absolute numbers as it is as much timing
related as anything else. With that said you are only looking for a
differential.. If the timing is the same in all cylinders and the fuel is the
same then the egt ought to be as well if you allow a little 'windage' for
cooling system issues. If they are different then I would bet the only thing
that is different is the airflow.. It might be worth a little fuel tweaking to
even them up if they are a lot different.. Over 100 deg F would be my threshold
to play a little.
Dave 
"Geddes, Brian J" wrote:
> 
> Is there a close enough correlation between EGT and A/F to use EGT to estimate the relative airflow differences?  I thought that the EGT-A/F connection wasn't very exact...but I'm certainly no expert.
> 
> - Brian
> 
> > -----Original Message-----
> > From: Dave Dahlgren [mailto:ddahlgren at snet.net]
> > Sent: Tuesday, February 11, 2003 12:15 PM
> > To: List for general do-it-yourself EFI talk
> > Subject: Re: [Diy_efi] Intake manifold flow testing
> >
> >
> > The sad part about this problem is that it most likely
> > changes with rpm as well
> > that is to say they can move around. a rich one at 4500 might
> > be a lean one at
> > 6000.  You could probably verify they stay the same by using
> > some egt probes and
> > data logging them along with rpm map and tps..Above all i
> > think i would only
> > want to add fuel.. Best idea is get a better intake manifold.
> > Dave
> 
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