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Old 01-21-2004, 09:37 PM   #1
lawn boy
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Default up pipe EGT gauge tapping

how much more innacurate would my greddy EGT gauge be if i were to tap it into the EGT probe bung in my pde up pipe? I am not running heavy mods, so this gauge is not as important to me as it is for some.
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Old 01-21-2004, 09:50 PM   #2
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It would definately read a good bit lower. Why don't you just put it on the driver side manifold? It took me about 45 minutes to remove the manifold, drill and tap it. I am in no way shape or form a master mechanic. If you are doing an uppipe install the manifold has to come off anyway so you might as well do the job right so that you can get the most accurate reading.
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Old 01-21-2004, 10:17 PM   #3
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Here's another thought. I have heard of some peoples egt probes going bad and the probe will break up and go into the turbo . I don't know how often it happens but, if the egt is not super important in your app. i think you should put the probe in your DP. I kknow that the reading won't be as accurate but it will be a lot safer.
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Old 01-21-2004, 10:21 PM   #4
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Quote:
Originally posted by abqkid
Here's another thought. I have heard of some peoples egt probes going bad and the probe will break up and go into the turbo . I don't know how often it happens but, if the egt is not super important in your app. i think you should put the probe in your DP. I kknow that the reading won't be as accurate but it will be a lot safer.
Buy a better probe next time?
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Old 01-21-2004, 10:23 PM   #5
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I have seen about 50-100*F difference between what others are seeing in the manifold and what I have seen in my uppipe (EGT in stock location, stock EGT removed on aftermarket uppipe). If you drill and tap a 12x1.25mm bolt, with the right threads (depends on your EGT) you can put it in there in a totally reversible manner.

At high flow rates, the exhaust moves very quickly. IMHO, you don't have to worry too much about the small loss in temp. At idle and low throttle, there might be a more noticable difference, but at high throttle flow, the readings should almost be the same. Tune with it in mind and you should be fine...

A reading of EGT in the downpipe is totally useless as there is a temperature drop across the turbo (see: thermodynamcs) that changes a lot w/ load.

-Charlie
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Old 01-22-2004, 12:53 AM   #6
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If you are going to be shopping for a new turbo soon then I would stick it in the up pipe.
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Old 01-22-2004, 02:11 PM   #7
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Quote:
Originally posted by mixup52
If you are going to be shopping for a new turbo soon then I would stick it in the up pipe.
Explain.
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Old 01-22-2004, 03:17 PM   #8
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Quote:
Originally posted by mixup52
If you are going to be shopping for a new turbo soon then I would stick it in the up pipe.
Not true! Got any proof...

I have had an Omori EGT probe in the drivers side mani. for 15k, no issues at all.

The tips just dosent 'break off' sometime it can melt, but its not going anywhere. Maybe with a cheap ass Autometer probe, but not a quality one.

Hopefully Clark will read this and comment, hes had on for ALOT longer than I, and runs waaay more boost.

-Dave

EDIT: And putting it in the DP is near useless. Its SO slow to respond you cant tune with it. I know, because I had it there first
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Old 01-22-2004, 04:05 PM   #9
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Just what exactly is "drilled the manifold and tapped it for an EGT probe." Can any muffler shop do this? Will they know what I'm talking about when I say drill n tap? How is the EGT Probe be installed?

Okay, this is the third topic, and hopefully this time I'll get a response other than "oh yeah, thats what I did to."

Rickyh, drill and tap. just what exactly is tap? tap to the thread, how is the probe going to be held in place? What drill did you use?

Can any one please point me to a DIY instructions, I might as well do it myself. It seems easy according to Rickyh.
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Old 01-22-2004, 04:23 PM   #10
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Quote:
Originally posted by WR xplosive
Just what exactly is "drilled the manifold and tapped it for an EGT probe." Can any muffler shop do this? Will they know what I'm talking about when I say drill n tap? How is the EGT Probe be installed?

Okay, this is the third topic, and hopefully this time I'll get a response other than "oh yeah, thats what I did to."

Rickyh, drill and tap. just what exactly is tap? tap to the thread, how is the probe going to be held in place? What drill did you use?

Can any one please point me to a DIY instructions, I might as well do it myself. It seems easy according to Rickyh.
A Tap and Die set makes holes threaded (the tap part), and the die is used to repair threads in bolts.

After you put a bolt in the Upipe EGT hole, you then need to drill a hole through that bolt, and tap threads into it for the new EGT probe to thread into.

But did you read above, you reads wont be as good, and its easier to drill/tap the manifold..
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Old 01-22-2004, 04:41 PM   #11
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EGT probe anywhere but the manifold is useless. If its not 100% accurate, you cant trust it, and you should not bother looking at it as it is irrelevnt. EGT probes int eh downpipe are particularly useless as its far enough back that small(50 degree) quick temp changes will not even be picked up by the gauge, as the change will have been evened out by then.
OK so it will be just lower. Then tell me EXACLY how much heat loss you are having from the block to the probe. You cant, there is no way to know exactly how much, so you could say "ok its 800 normally in the DP on my car" How do you know that's not dangerously highin the cyl? You have no way of knowing, because you dont know the temp drop fromt eh head to the probe. It goes in the manifold for a reason, to monitor the ACTUALL temps of the exh gas.

EGT probes do NOT break off and go into the turbo, when they fail, they simply stop working or VERLY slowly melt off and disintegrate, there is no danger in putting it pre turbo.

Removing the drivers side manifold is a 15 min job, drilling/tapping another 10-15, and re-installing the manifold is another 15 min or so. its VERY easy, there is even a little flat boss just for drilling and tapping.
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Old 01-22-2004, 04:51 PM   #12
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ohhh ic. I dont wanna use the U/P bung for the EGT probe so...

drilling = of course, drill hole into the manifold.
tapping = making thread into the drilled hole in the manifold.

does the size of tapping differ from each probe from each manufacturer? Or are they universal in size?

Thanks 03WRXMA

a little flat boss just for drilling and tapping.
Okay, I am really mechanically declined, I need the brand name so I can buy one myself.

Thank you.
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Old 01-22-2004, 05:02 PM   #13
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Quote:
Originally posted by WR xplosive
ohhh ic. I dont wanna use the U/P bung for the EGT probe so...

drilling = of course, drill hole into the manifold.
tapping = making thread into the drilled hole in the manifold.

does the size of tapping differ from each probe from each manufacturer? Or are they universal in size?

Thanks 03WRXMA

a little flat boss just for drilling and tapping.
Okay, I am really mechanically declined, I need the brand name so I can buy one myself.

Thank you.
Thanks for the backup Dave

As for the pitch/size of the thread for the EGT bung, it varies by make.

Sears sells and excellent tap and die set, or a cheap one can be had from Harbor Freight.

YMMV.
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Old 01-22-2004, 05:08 PM   #14
WR xplosive
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Okay, thanks a bunch to you all.

I will make note to get me a tap and die set from Sears.

I just need to decide which brand of EGT gauge should I get.

Thank you all. Thank you!
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Old 01-22-2004, 05:28 PM   #15
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The harbor frieght tap and die set is crap. I had one and it sucked. you don't have to buy a complete set. Whatever gauge you get will tell you which thread type you will need. I forgot which type a greddy gauge needs, buy when I recieved my gauge I went to home depot and bought the single tap that I needed. Hell, it even came with the proper size drill bit. They sell a few sizes like this. Saved me a few bux over buying a whole set. The drivers side manifold has a little "button" on it. It is a little raised circle about 1/4 an inch or so around. When you pull the manifold off you will see what I am talking about. That is where i put my sensor. It really is not a difficult job. Just make sure you have a little lube when you tap the hole for the threads.
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