Dropped the car off this morning to have a couple EGT bungs welded in . The shop calls to say there is no way to get a welder tip up in there to weld them on one of the header tubes . Will the EGT probe be no help for tuning if put near the collector ?

 

I have mine on the merge pipe of the the two headers...its not that its no help...its just that theoritically one bank could been running richer or leaner then the other so its not as accurate...but its still useful....

 

Well after talking to the shop . They said if you dont get them with in a 3 or 4 inches from the exhaust port , they will not be very accurate on whats going on in the combustion chamber . Any one else have opinion on it ?

 

Well the thing is even if you get it within 3" of the exhaust port its only going to read the EGTs off of that one cylinder. Its still not going to tell you what the entire motor is doing...The only way to really know would be to run one probe at each cylinder...At the merge works just fine. Thats where the wideband was placed during tuning on my car...

 

Mine is installed just behind the Header/Cat flange and it seems to be working fine. I cannot image that the exhaust temp falls that much in a few inches.

 

First thing they asked me when I said I wanted to put them in was . Did I know which Cyl. ran the hottest on each side . That make sense . When They pulled my motor the drivers side rear cyl. was the lightest in color , so you would think that it was the hottest running . If you keep tabs on the hottest and keep it from getting to hot [ detonation ] then the rest should be good to go

 

Yes if you have that info then it certainly does help. But not having opened up my motor theres no way for me to know. Therefore taking a merged reading of the flow off of one bank should be sufficient...

 

From all my previous experience/reading with turbo cars they are correct.

You're supposed to put an EGT probe within a few inches of the chamber on the hottest cylinder (#5 or #6 on our cars) if you want good accuracy/speed/safety. With the probe further down the line temps may change and it will not be as dramatic, you might not know you're in trouble until it's too late.

These are the first turbo cars I've been involved with where people are not putting the EGT probe close to the chamber on the hot cylinder. I have seen some people on other cars running dual EGT's with one probe on the hot cylinder and one at a collection point just for reference. I am thinking about getting a dual gauge myself.

 

It is a very big difference. On DSM's it was ~250 degrees I believe.

Like I said both will work, but up close to the combustion chamber you get a much bigger range in temps so you can see what's going on better.

 

I have a question for you guys. Im running mine on the cat right up top near the header. The thing is how do you know what a safe temp is? What range?

 

I'd like to add to this. I will be installing a APS TT soon, and have a thermocouple in one of the merge pipes already. I'd like to tap it into the new manifold, but I hear horror stories of the thermocouple breaking and getting into the turbo. Is this something I should be worried about? Has anyone installed a thermocouple on a turbo manifold pre-turbo? Thanks

 

It's supposed to be pre-turbo. Of course it's better to buy probes that are not known to disintegrate, but I have seen people with turbo cars lose the some or all of their thermocouple with no damage to the turbo.

 

SO it looks like I'll be dropping the driver side header to put it in . Thanks for the reply's guys.....Bill

 

Mine is installed on the merge pipe for the Turbonetics kit before the turbo. Before the turbo is the only way to read true data...