Where is the best place to put it?

 

Are you just trying to monitor your exhaust temps. I dont really see the need for one unless you have a turbo or something.

 

3" from header flange.

 

Doesn't matter as long as they are all equidistant from the flange. EGT's are simply a tuning reference that shows cylinder to cylinder air/fuel distribution. I'd never try to compare one engine to another due to the variables involved... least of which have anything to do with the EGT locations.

I don't have headers fitted with EGT bungs for my street cars. Instead, I use an EGT plate that fits between the head & header for dyno tuning. Probably places the EGT probe ~3/8" away from the port.

-Mindgame

 

I believe Autometer says 1-3 inches from the head. I mounted mine in the AIR tube on the driver side header. Just had to cut it down a bit so the probe was in the exhaust path.

 

Guess I misunderstood the initial question about an EGT probe (not plural). I fail to see where a single EGT probe would help much when tuning an 8 cylinder engine. Those of you using one... how are you acting on the data?

-Mindgame

 

I used my for generalized tuning since the stock PCM isn't really that great at tuning for individual cylinders. If #1 is ok, the rest should be close enough. Not the best way, but it works.

 

I have a single EGT, mounted in the #7 primary, about 1" from the flange. Seems to me that #7 generally runs a bit hotter, and will show up problems quicker than the cylinders closer to the front of the engine and the water pump.

Once you get it tuned, you look at the EGT profile. That represents the correct tune. Compare that profile to the results for each run, and when can start to see changes, you know you need to look closer for the cause of the problem. Without a wide-band, an elevating EGT temp can be a rough indicator that you may be running lean.

 

Thanks for all of your help
I think i'm going the way of Injuneer

 

Thanks Fred,

I like the idea of using the single EGT probe like you mentioned... as a tuning reference. Makes perfectly good sense to me.

-Mindgame

 

Not a good picture, but you can see the probe on #7....