Where on DP to tap EGT

[hottboost]

Im going to tap my EGT in the Down pipe. How far down should I go for acc. reading?

 

[JDNSBR]

For curiosity's sake. Why do you want it in the DP? The most accurate and common place for it is in the first runner on the manifold. There is quite some debate about this that has been going on for years and you might hear some different answers. Others prefer the middle of the manifold ect. However the closer you have the probe to the head the more accurate your EGT readings will be. The further the probe is away the more time the exhaust gases have time to cool down.

 

[blcknspo0ln]

I totally agree with you John. Here's some food for thought. I don't remember which member on tuners said it, but it makes a lot of sense.

Whether or not your EGT is in runner 1 (where I have it, btw) or before your flex section in your downpipe, the temperature at which you run at during WOT conditions when you are PROPERLY tuned at is what you are concerned with. I.e., If you are running a 11:1 AFR @ WOT (just to be safe, I suppose) and your EGT's are 1500*F, then that is the temperature at which you are concerned for. Anything over 1500*F is where you will start being concerned with running lean. Adversely, with a completely different car mounted in runner 1, running 11:1 AFR @ WOT that car will have 1600*F as it's normal WOT temperature. Same thing with mounting it in the downpipe. EGT's can read 800*F but if it's tuned correctly it's fine and that is the EGT temp you should be concerned with.

 

[hottboost]

Thanks guys, reason for doing it in dp is I dont want to pull the mani off to drill and tap, and Ive never tried to do it with the vehichle running and dont want to take a chance on a shaving destroying my turbo. Plus I have a datalogger for tuning also. How safe is it to drill and tap with the car at idle??

 

[JDNSBR]

You don't want to drill and tap with it on the car at all. The piece you are drilling and tapping I highly suggest taking off and doing this off of the car. This would then eliminate all worries of putting shavings through your system.

 

[DSMcrazy3]

Definitely do not drill and tap anything before the turbo with the manifold on the car. It's really not that hard to take the manifold and turbo off, and it will be a good learning experience for you; hands on, at that.

Why in the world would you want to do this with the vehicle running? Those exhaust temperatures are extremely hot. If it is running, once get a hole drilled the air shooting out will be too hot for you to put your hand anywhere near. Not to mention the steel pipe will be too hot to touch.


Be sure the car is off and cool.

 

[kmoore]

Now i just started a thread a while back, about drilling or not drilling into the manifold while on the car and about 90% of the people that posted said that it was absolutely fine to drill a hole in you manifold while on your car. As long as you go from the smallest drill bit to the correct size drill bit (size of probe). Now i was going to drill the hole while on the car but now you guys got me concerned

 

[andymoraitis]

I strongly recommend removing the manifold for drilling purposes. While you may not have a problem using stepped drill bit sizes to slowly increase the hole diameter, do you really want to take a chance that a random shaving will be eaten by the turbine?

Better safe than sorry.

Andy

 

[DSMcrazy3]

now you guys got me concerned

Good, the should be a followed by a thank you

Better safe than sorry.

Right on.

 

[boostedinaz]

Doing it on the car is not as bad as some will have you believe.

I did mine on the car and it took a few minutes with no problem at all. Nothing will fall in the manifold if you do it right and take your time. In the end it is up to you but you won't get burnt and it will take only a few minutes with it on if you go that route.

Here is a thread for referance.

http://www.dsmtuner.com/forums/showthread.php?t=230323

 

[kmoore]

Yeah, that's my thread above. Listen to the Wiseman!

 

[DSMcrazy3]

Listen to the Wiseman!

I agree..Andy

 

[boostedinaz]

Listen to the Wiseman!

What wiseman? Two of us answered and both have a different opinion.

 

[rjennings]

If you tap the hole for the EGT probe in the Exhaust Manifold while it is on the car just have the car running, so that if any shavings try to fall down the exhaust gases will blow them back up. Take your time while tapping with the Manifold still installed.

The best place for an EGT probe is on runner #1 (just like everyone stated), but if you are very concerned and must do it after the turbo, why not the O2 Housing instead of the Downpipe?

Randy

 

[hottboost]

Thats where I am going to tap it is in the O2 Housing. Thanks for the replies

 

[Shane2GSX]

I have the Autometer EGT and Megan Racing 3" DP and I tapped mine into the DP right before it starts to turn for the back, on the right side. It's a good spot and doesn't get in the way of anything. My temps go up to about 1300F at full throttle, so running out of room on the Autometer 1600F capacity gauge shouldn't ever be a problem. If you were to mount it on the manifold, you could see temps higher than 1600F, so you'd have to buy a guage that reads past that. As blcknspo0ln stated, what your looking for is that increase in temperature. Whether the increase is 1600 to 1700 or 1300 to 1400 does not matter. I think the DP is the best place. My .02.

 

[kmoore]

What wiseman? Two of us answered and both have a different opinion.

I was just making a joke. I saw the DSM WISEMAN below so i figured the wiseman knows what he is talking about. Good luck with the egt gauge. I just bought boost, egt, and oil psi gauges today.

 

[hottboost]

Also what size bit and tap should the autometer probe be???

 

[blcknspo0ln]

It should be included with the EGT. The TRE probe uses a 1/8 NPT.

 

[kmoore]

It should be included with the EGT. The TRE probe uses a 1/8 NPT.

Do you mean both the drill bit AND Tap or just the drill bit? If it comes with both that would be awesome!!

 

[flacopower]

Whether or not your EGT is in runner 1 (where I have it, btw) or before your flex section in your downpipe, the temperature at which you run at during WOT conditions when you are PROPERLY tuned at is what you are concerned with. I.e., If you are running a 11:1 AFR @ WOT (just to be safe, I suppose) and your EGT's are 1500*F, then that is the temperature at which you are concerned for. Anything over 1500*F is where you will start being concerned with running lean. Adversely, with a completely different car mounted in runner 1, running 11:1 AFR @ WOT that car will have 1600*F as it's normal WOT temperature. Same thing with mounting it in the downpipe. EGT's can read 800*F but if it's tuned correctly it's fine and that is the EGT temp you should be concerned with.

most logical response i have heard to the 'where to mount my egt probe' question..

 

[blcknspo0ln]

Do you mean both the drill bit AND Tap or just the drill bit? If it comes with both that would be awesome!!

You have to drill the hole first and then tap it. I.e., drill with a 5/32", then 11/32", then use the 1/8-27-NPT tap.

most logical response i have heard to the 'where to mount my egt probe' question..

No credit to me. I just ellaborated on what DSMJim posted a while back.

 

[hottboost]

Thanks thats what I was looking for. Sometimes I post questions with bad grammer but I knew I had to drill first and then tap. TKS. !!

 

[blcknspo0ln]

Glad to help I also edited my reply above to make it a little more accurate for ya.

 

[kmoore]

I just received my autometer egt gauge and it did NOT come with a bit. But in the instructions it says... reading... 5/16" letter R<-(whate ever that means) .339 drill bit and follow through with a 1/8" NPT pipe tap. I'm going to drill and tap mine in a couple of days so i will let you know how it goes.