[s-cars] EM type, chip upgrades EGTs

[Trevor Frank]

Hmm, I was told 1k deg C before the turbo max, and somewhere under 800
deg C after.  I have both a WB o2 and an egt after the hot side, soon to
have one after each cylinder.  I know data points for WB and EGT's off
of the dyno.  But honestly I think that cylinder pressure vs. crank
angle and WB data would be most useful, especially 4 gas data as well.
I would really like to find someone locally that has one, cylinder
pressure gauge, my local dyno shop doesn't think there is much to gain,
they are getting down in price and can be place under the spark plug or
even in it.  Ultimately I would suspect that Exhaust temps are more
about motor endurance.  But  generically the higher the better from a
performance stand point, right.  I suspect that egt's require that you
have some practical experience with the specific motor and cams used.
Otherwise with overlap you could have number that I would suspect may
cause some to retard the timing too much. But hey I could be wrong.

-----Original Message-----
From: Mihnea Cotet [mailto:mik at info.fundp.ac.be]
Sent: Monday, July 14, 2003 9:17 AM
To: mlped at qwest.net
Cc: s-cars
Subject: RE: [s-cars] EM type, chip upgrades EGTs


Mike, see the answers inserted,


At 19:56 13/07/2003 -0600, mlp qwest wrote:
>It might be a nice data point to have Mihnea, but from what I've seen
>on the list, as you suggest, precious few, if any here can give you an
>EGT figure for what their cars are running.  And for the few that
>could, I bet I don't know what the measurement would tell you unless
>you had some idea where the probe was located.

Of course I'd have to know where the thermocouple was located during
measurements, otherwise it makes no point in measuring EGTs :-)


>When I have seen an occasional thermocouple, its usually been installed

>after the turbo, in the downpipe.

Yup, that's the easiest way to install it, given the fact that there's a
CO test tube that can be removed and a fitting to be placed in order to
install the thermocouple.


>Are you in fact able to collect EGT temperatures for the cars you are
>writing software for?

Yes sir, actually my tuning is more based on the EGTs than on a WB
sensor output, simply because it's not always practical to install a WB
O2 sensor.

>If so, how close a control do you have over the
>location of the probe taking the temperature(s)?

Well, I have universal adapters for my thermocouple that I use after the
turbine, in place of the original CO test tube (or the screw that's
there from the factory on some ABY S2s and on all RS2s). This way, I
know what temps to expect and what to do in order to correct them.


>I'm still trying to get a better handle on what the air flow
>differences are between the K26 compressor wheels and the various
>Garrett parts.  You don't know of any better compressor maps for the
>wheels other than those available off SJM's site for the KKK parts, and

>the "rough" guestimates provided by Turbonetics for their Garret wheels

>do you?

Nope, very unfortunately I don't....

Cheers,


Mihnea



>~-----Original Message-----
>~From: Mihnea Cotet
>
>...
>~
>~
>~What happened to Hap can be interpreted quite easily but first a few
>~preliminary questions:
>
>~-What EGTs was he running with his T3/T4??? (that isn't an RS2
>equivalent ~IMHO just because it doesn't flow the same air at the same
>PR points in the
>~map) and I bet $2000 that almost no one here on the list knows what
EGTs
>~he's running at WOT.
>
>
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