Old Fashioned Tuning - Re: [Gmecm] EGT tuning (was BIG CAM TUNING)

[DV Fagan]

Why not go to a drag strip, put a time only slip on it
and make repeated runs advancing the distributor 2
degrees per run until the et's fail to decrease.  Then
at least  you will know what max ignition advance
should be. It will be a fun evening and it shouldn't
cost a lot.  On another evening you could increase
fuel pressure with a  dozen quarters placed in the
regulator one at a time in a like manner.  No
programming and little cost (a gasket set for $6).  Or
you  could reprogram the ecm 90+ times as some on this
list claim they have done and spend years and
kilobucks on chip programmers, erasers, ALDL
interfaces, software, a laptop and PROM emulators. 
It's your choice.
Dennis 

--- Jay Vessels <jay at vessels-clan.com> wrote:

> Hi there!
> 
> A gas analyzer would be the best bet but it's not as
> fast as a WB so 
> you're probably going to only use it for a dyno with
> a brake.  EGT is 
> okay but you can't tell whether you're way rich or
> way lean since EGT 
> can rise on either side of good.  Considering EGT
> thermocouples are 
> cheaper than WB sensors, I'd guess that if they were
> really accurate the 
> OEMs would have jumped on them by now.
> 
> Just saw in a recent issue of Hot Rod magazine about
> a company selling a 
> 1 WB-per-cylinder kit in a resonable (for WB)
> pricing schedule.  Still 
> pricey for the homebrew but if you have a dyno in
> your shop it's 
> probably justifiable and within reach.
> 
> Jay Vessels
> 1982 Chevrolet S-10 Sport, 2.8V6 TBI
> 1984 Chevrolet S-10 Blazer Sport, 2.8V6 carb. (for
> now)
> 
> Robert Fleming wrote:
> > Have you done much dyno tuning with an EGT? 
> Sounds
> > like a good idea but I've talked to a few people
> who
> > dyno tune all the time and say its sort of
> worthless
> > unless you run an EGT at each exhaust port.
> > 
> > Robert
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> 


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