Tuning with EGT

Flanagan, Steve Steve.Flanagan at VerizonWireless.com
Tue Mar 13 22:56:50 GMT 2001


about 4 in from the header bracket (exhaust port).  I think, but 
in this range, I have not looked at car since last Oct.  At my
brothers (he owns it).

Just for group share: our tuner put it on the dyno last year and
leaned it out chasing a inconsistent sputter, we saw over 1900
and within 6-10 passes it went to pieces.  

We ran several seasons around 1800 and never had any structural 
damage when examined during freshen ups.

Be warned, 1900+ is the danger zone, 1800-1900 is playing with fire
also.

Hope this helps,  By the way, the motor is all state of the art,
no OEM.  So don't try this with your leased car!!!!!

Steve

-----Original Message-----
From: Grant Crockett [mailto:idratherbedriving at yahoo.com]
Sent: Wednesday, March 07, 2001 3:51 PM
To: diy_efi at diy-efi.org
Subject: RE: Tuning with EGT


How close is your probe to the exhaust port?

--- Steve.Flanagan at VerizonWireless.com wrote:
> I use 8 EGTs to aid in tuning a 1600 HP Turbo setup.
> We see temps from 1700
> F to
> 1900 F.  Lets say we do not like to see anything
> over 1900 but we have seen
> it.
> 
> Typical range I would say for blown applications is
> 1600 - 1800 F.
> 
> As far as tuning, its aids in individual cylinder
> tuning, but there is no
> absolute
> value that you can tune for.  Its more or less used
> as a reference from the
> last 
> pass.  Its also great to see if you have a problem
> with any one cylinder.
> We use
> 116 octane.  Combined with wide band 02 provides a
> great basis to tune from.
> 
> steve
> 
> -----Original Message-----
> From: Larry Heath [mailto:lgheath at earthlink.net]
> Sent: Monday, March 05, 2001 3:24 PM
> To: diy_efi at diy-efi.org
> Subject: Re: Tuning with EGT
> 
> 
> Most guys that drag race use EGT to tune. Most of us
> look for a max of about
> 1200 to 1250 degrees F as the car crosses the finish
> line, i.e. max load max
> rpm. This is of course using fuels with very high
> octane ratings, generally
> no less than 105 octane and as much as 118, that are
> generally not prone to
> detonation even under extreme conditions. I lot of
> guys use the EGT's in
> tuning alcohol fueled engines, as the typical signs
> use to tune gas fired
> engines are generally not present, the alcohol fuel
> being very clean burning
> and has such a wide range of flammability. Most guys
> seem to use the same
> basic temp range as a max, although I have seen
> references to EGT's much
> lower than the 1200 to 1250 range as being ideal for
> max power.
> 
> Thermocouples (K type) are generally fairly slow as
> far as response time
> goes, at least for the typical thermocouples used in
> this application. The
> faster the response rate of the couple the shorter
> the average life of the
> unit is.  I have seen bare wire thermocouples with
> standard response times
> of as little as .004 sec, but these would not last
> any significant amount of
> time, in an exhaust gas environment. About the
> minimum wire size that would
> be usable as a EGT is .015" and this has about a .8
> sec response time going
> from 100 to 800 degrees in 60 ft/sec gas.
> 
> Along these same lines I have a question; does any
> have any info about
> tuning alcohol fueled engines using an O2 sensor or
> other similar sensor to
> allow A/F ratios to be determined on a much faster
> basis than the typical
> EGT thermocouple sensors.
> 
> Later Larry
> 
> ----- Original Message -----
> From: "Grant Crockett" <idratherbedriving at yahoo.com>
> To: <diy_efi at diy-efi.org>
> Sent: Monday, March 05, 2001 11:41 AM
> Subject: Tuning with EGT
> 
> 
> > Has anybody done air-fuel mixture tuning with
> exhaust
> > gas temp rather than O2 sensor?  I have read that
> the
> > thermocouple has a much quicker reaction time to
> high
> > heat/lean fuel conditions than an O2 sensor.
> >
> > If so, what are you getting for temperature
> readings?
> > I am wondering what temps (deg F) would equate to
> > optimum performance, without detonation.
> >
> > end
> >
>
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