[Gmecm] EGT tuning (was BIG CAM TUNING)

[Programmer]

This is just my opinion...CO % is still my preferred tuning method. You can
have wide band numbers that are right off the map at idle, and correct at
WOT...reason being that the actual 'indicator of combustion' is how tuning
should really be done.

On wilder camshafts, the two numbers (CO and O2) will often differ...and
knowing what CO can show you, can improve your tuning skills.

EGT's are somewhat misleading...retarded timing can yield much higher
EGT's--so in the end, torque at the wheels on the dyno is a better
indicator--use the EGT's as a comparison at the track for the fine tuning,
once dialed in on the dyno.

Lyndon.

----- Original Message ----- 
From: "Jay Vessels" <jay at vessels-clan.com>
To: <gmecm at diy-efi.org>
Sent: Saturday, June 18, 2005 8:56 PM
Subject: Re: [Gmecm] EGT tuning (was BIG CAM TUNING)


> 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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