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Discussion Starter #1
can someone get a pic and circle me where i should put the probe? please!! pretty please?? i'll make some good exhaust sound clips :)
thanks in advance!

and also as suggested i plan on getting drill bits leading up to the right size, starting the engine and doing that way as someone suggested since the pressure will push out the metal as i drill it. if someone has any suggestions please post them!!! i thank you in advance!!!

of course i will post pics and so on and so forth.

:)
 

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No pics, but I have question for you.
If some one tells you tap it on the exhaust manifold and before the turbo then I'm telling you it would be mistake to drill it withe car on. risking shavings going thru the turbo is just that, a risk and pretty big one at that.

Hector did it just after the turbo, not a true engine exhaust temp, but good enough to tell you if temps are getting out of hand. He would be your man for this area, seeing as he owns an exhaust company.

-James
 

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Discussion Starter #3
it was under the direction of someone else to do the engine running thing, sounded pretty logical. i'm waiting for some more backup on this before i do anything. the plan is for sometime tomorrow evening to do it.

i hope someone replies by then :\
 

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I haven't done this personally but I have seen it done. DSM guys have been doing this forever & I've never heard of a turbo failure as a result of drilling the EGT hole before the turbo?

Here's a few pointers. Grease the drill bit (metal grindings stick to it). Drill while the motor is IDLING (turbo spins slower allowing any particles to blow through) take your time & go slow. When the drill bit is about to break through you'll notice that the shaving blow out instead of getting sucked in.

FYI- you want to get the turbo in the exhaust runner most likely to run the leanest (worst case senerio of reading hottest cylender). Placing the EGT after the turbo can alter the temps by like 300 +- degrees.

The only problem I can see is getting to the exhaust mani seeing as how it's crammed up against the back firewall? Good luck 7 let us know how it goes?
 

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Mr Ryno is correct. The best place to install the probe would be in the actual manifold runner where the exhaust comes out the head.
But as Ryno said, youwill get shavings inside the manifold and it will damage your turbine.




If you look below, you can see the tube portion that comes down. THis is where I installed mine at. Now this is right after the turbo. This reading is alot more reliable than most other manifolds that are not tapped in the runner. Reason being that the manifold is all part of one cast. WHere I tapped my probe is part of the actual cast and its not like I tapped at the downpipe portion which is alot cooler than the cast iron.

I have my probe as a reference. I take a max reading at WOT. ANd then when i start doing mods later, i know if it affects my A/f by looking at my egt. If the EGT goes alot higher up, i know im running leaner. The best unit is a wide band A/F ratio unit which im working on getting. But they are about $600(well worth it) so the EGT is the second best unit to get.


 

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V8killer,

I was going to attempt to drill as you described, the the place has limited spacing which would cause the manifold to get to hot to quick. I used a step drill and a 1/8NPT tap for my setup.

If any of you guys manage to tap into the runners, tap it on the #4 cyl which is the one on the passanger side(i think thats #4?). Its the leanest running cyl being that the intake manifold section there has the least amount of area.
 

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Just a thought, but i could be wrong, couldn't you just take the manifold off, and take the turbo off the manifold, or is it impossible, i really havent checked this out.

Another thing is, from my experience, I've seen that an EGT gauge is more of a reliable source of how your engine is being run than an A/F T due to the heat your able to read through the EGT. Im sure you would be able to prevent from killing your motor, but with an A/F gauge (wideband included) you would be just in the ballpark before you knew something is happening.
 

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ravencit said:
Just a thought, but i could be wrong, couldn't you just take the manifold off, and take the turbo off the manifold, or is it impossible, i really havent checked this out.

Another thing is, from my experience, I've seen that an EGT gauge is more of a reliable source of how your engine is being run than an A/F T due to the heat your able to read through the EGT. Im sure you would be able to prevent from killing your motor, but with an A/F gauge (wideband included) you would be just in the ballpark before you knew something is happening.
A wideband A/F sensor is extremely acurate. To tune correctly you use both together to dial in the correct fuel pulsewidth/timing advance.
 

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Discussion Starter #9
well, maybe i'll install it just after the turbo, i dont really wanna screw it up i just hope the readings will be as good
 

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ravencit said:
Just a thought, but i could be wrong, couldn't you just take the manifold off, and take the turbo off the manifold, or is it impossible, i really havent checked this out.

Another thing is, from my experience, I've seen that an EGT gauge is more of a reliable source of how your engine is being run than an A/F T due to the heat your able to read through the EGT. Im sure you would be able to prevent from killing your motor, but with an A/F gauge (wideband included) you would be just in the ballpark before you knew something is happening.
You are 100% correct. The EGT does not respond as quick as an A/F. Im working on getting my hand on a unit that reads 20 times per second. The EGT gauge has to climb to get to its reading, the A/F displays it pretty quick being that its usually a digital display.

Im yet to see an EGT on a car that responds anywhere close to what is on an aircraft. We use digital EGT gauges on those (turbines engines).
 

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Discussion Starter #11
after the nascar race im going to a friend's to put it in. i will be putting it in after the turbo. i plan on running the car at idle while i do it to ensure that any metal goes out the pipe. i will also grease the bit as suggested. i anyone has any oter suggestions (thanks to those that did!!) say it now.

i'll have pics etc etc etc sometime
 

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Discussion Starter #12
hoping to get this answered: the wire from the probe isnt the longest. is it ok to extend it? should it be soldered on? what gauge wire?

thanks!
 

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Exhaust Depot said:
ravencit said:
Just a thought, but i could be wrong, couldn't you just take the manifold off, and take the turbo off the manifold, or is it impossible, i really havent checked this out.

Another thing is, from my experience, I've seen that an EGT gauge is more of a reliable source of how your engine is being run than an A/F T due to the heat your able to read through the EGT. Im sure you would be able to prevent from killing your motor, but with an A/F gauge (wideband included) you would be just in the ballpark before you knew something is happening.
You are 100% correct. The EGT does not respond as quick as an A/F. Im working on getting my hand on a unit that reads 20 times per second. The EGT gauge has to climb to get to its reading, the A/F displays it pretty quick being that its usually a digital display.

Im yet to see an EGT on a car that responds anywhere close to what is on an aircraft. We use digital EGT gauges on those (turbines engines).
Does anyone make Digital EGT's, I really like that idea better than A/F. It just seems to me that A/F readings are off the O2, which are not the most accurate readings, even if the o2 is a wideband sensor.
 
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