Drilling a hole for EGT.
- Thread starter artorush
- Start date
artorush;1301123 said:
I would never drill into the turbo. keep in mind the turbo is watercooled so you could hit a water channel, oil channel or just fuck up the turbo. To get the most accurate reading you would prolly want to be in front of the turbo, but drilling in cast iron doesnt sound fun, especially considering it could cause cracks in the manifold. I would put it on the elbow after the turbo near the 02 sensor, in fact many aftermarket turbo elbows come with an extra bung already installed.
Good luck!
Also remember,
one EGT sensor is the average of all 6 cylinders. And by the time the EGT sensor shows something is wrong temprature wise, the event already took place and probably more than once at high HP/RPM.
So use it as a tool but not as a "Oh shit, something is wrong" meter as by the time the word "Oh shit" comes out of your mouth, you will be lucky to have a working engine much less a hole-less piston.
one EGT sensor is the average of all 6 cylinders. And by the time the EGT sensor shows something is wrong temprature wise, the event already took place and probably more than once at high HP/RPM.
So use it as a tool but not as a "Oh shit, something is wrong" meter as by the time the word "Oh shit" comes out of your mouth, you will be lucky to have a working engine much less a hole-less piston.
6th runner. It is extremely easy to drill in to and tap. I'd avoid drilling in to the turbo at all costs.
I would not drill into he turbo. Like Fig newton said, the only way for the gauge to be looked at it a average. If your temp spikes, which I have seen this happen; you have toasted something already.
I have drilled into the downpipe before, and some companies offer a downpipe with more than one bung.
I have drilled into the downpipe before, and some companies offer a downpipe with more than one bung.
adampecush;1301152 said:
I would avoid drilling the turbo where he indicated
Placing the EGT probe just aft of the manifold/turbo flange pre-turbine is fine. It will give you an accurate average of all 6 cylinder EGT. If you drill the #6 runner, you get one cylinder. If you place it after the turbine (turbo elbo, DP, etc) you will get a lower EGR vs pre-turbine.
artorush;1301201 said:
hmm
let me copy what I posted in another thread....
myself said:
Guess where your statement falls into
What happens with the "I heard", " so and so" etc is that it is usually never ever true.
So what you heard, is not true.Or asked another way. What makes cylinder #6 hotter than the rest? You are already creating about 800f worth combustion temps on all 6 cylinders.
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I have an EGT laying around that I first decided not to use, however, my newest turbo already has a place for an EGT probe drilled on the side of where the hotside mounts to the manifold.
Seeing how the hole is already drilled and tapped; is there any downside with installing the probe there?
Seeing how the hole is already drilled and tapped; is there any downside with installing the probe there?
figgie;1301202 said:hmm
let me copy what I posted in another thread....
Guess where your statement falls into
What happens with the "I heard", " so and so" etc is that it is usually never ever true.
Or asked another way. What makes cylinder #6 hotter than the rest? You are already creating about 800f worth combustion temps on all 6 cylinders.
Hehe. well said.
For those that have an EGT meter in-car: Does it react fast enough to measure WOT pulls? Do you just use it to see the temp at cruising? Is there even really much of a need to have one?
mirage83;1301149 said:
Is that for a WB by any chance?
I would personally drill right before the turbo, on the manifold.
Did you say removing the turbo is not a option? Well than don't drill squat until it is.
I use mine for evaluation.
With my SAFR installed I noticed EGT rise, in higher rpm, to ~1550°-1600°F.
When I removed the SAFR and installed the Rebic LC, controls injector duration, EGT remained ~1450°-1475°F in higher rpm.
My probe is pre-turbo in the collector.
edit: both piggyback configurations were tuned to maintain ~11-12 A/F in wot.
photo by jimi87-t
http://www.supramania.com/forums/showthread.php?p=125175#post125175
[thumb]http://i19.photobucket.com/albums/b189/jimichonga/DSCN0900.jpg[/thumb]
[thumb]http://i19.photobucket.com/albums/b189/jimichonga/DSCN0904.jpg[/thumb]
With my SAFR installed I noticed EGT rise, in higher rpm, to ~1550°-1600°F.
When I removed the SAFR and installed the Rebic LC, controls injector duration, EGT remained ~1450°-1475°F in higher rpm.
My probe is pre-turbo in the collector.
edit: both piggyback configurations were tuned to maintain ~11-12 A/F in wot.
photo by jimi87-t
http://www.supramania.com/forums/showthread.php?p=125175#post125175
[thumb]http://i19.photobucket.com/albums/b189/jimichonga/DSCN0900.jpg[/thumb]
[thumb]http://i19.photobucket.com/albums/b189/jimichonga/DSCN0904.jpg[/thumb]
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isnms;1301313 said:
how much fuel were you pulling w/ the safr? typically after a point your timing will be higher than wanted and cause higher egts due to airflow scaling.
i use the wb for a/f and egt for timing. i know, here come the pilots... lol
iirc the most I ever pulled was 15% to try for mid 12 afr. I have found some info where I mostly pulled 9% when tuning for a low 11 afr.
I too was able to find a timing problem, miss adjusted CPS, with high egt's.
I too was able to find a timing problem, miss adjusted CPS, with high egt's.