I finally finished installing all of my new gauges and one of them is an Autometer Ultra Lite full sweep electric EGT. I have the probe tapped into the rear manifold at an angle so the tip sits right in front of the #3 exhaust port. It is located about 2 to 3 inches from the cylinder head as suggested in the instructions. The issue is that it appears that my EGT is really high. The car sits idle and goes to 800º. WIth a normal 75 mph cruise it can maintain 1000º and hard accelleration it goes to 1200º . I tried a 20 to 135 mph run last night to see how high it would go and it went all the way to 1450º F. Is this normal for NA or is it high? I wonder if my gauge is reading higher than it should. The exhaust mods on the car include hollow pre cats, a hollow OEM cat, a Y pipe but everything else is stock (B pipe and rear section). The fuel mixture really isn't in question here either because I have the SAFC-II set to 0 change across the board and the A/F tells me the mixture is correct as well.

 

This doesn't seem out of the ordinary. 1000F at 75 is actually a little lower than what I see, and my EGT probe situated in the y-pipe just below the header. I have done unboosted, sustained runs at 120 mph and was getting 1500F. Kind of scary to see the EGT that high since we try to tune boosted operation to achieve EGTs less than that, but the engine seemed very happy at that temperature.

 

I agree...sounds right in line with my readings before and after the SC and ZEX.

 

Thanks guys.. thats what I needed to know.

 

I have mine tapped in the front manifold. At idle, I am seeing 800 degrees. At WOT, I see somewhere between 1400-1450 as well. Your numbers are fine.

 

That's what I got when NA as well.

 

in a boosted situation, you want to keep it under 1500deg, or is there a better rule?

 

The conventional wisdom seems to be you want to be under 1475F at WOT in 3rd gear at the end of a 1/4 mile run. But I don't know if that is based on empirical data (temperatures seen during dyno runs where the afr is being optimized, for instance) or if it is just what so-and-so did and everybody else should, too. Certainly it is a safe margin, which is good, but I have read in an Eclipse forum where people are using 1600F as an upper limit which makes me think 1475 may be over-conservative.

Maybe some of the people who have blown VQs by turning up the boost too much could tell us what EGTs they were running.

 

Correction, if I drive the car at all it's at 1000º F but at 75mph it's more like 1150º F.

 

That's just about exactly what I get.

 

What a lot of people fail to realize is that it definetely makes a difference where you put the probe. So saying "keeping it under 1400F is recommended" aint the same across the board. If you install it somewhere on the Ypipe 1ft away from the cynlinders, you will get significantly lower EGT readings.

Best way to do it in my opinion is install it whereever you want, Ypipe, Turbo down pipe, manifold, i dont care. All you do is when you get the car dyno tuned and got it at the best a/f ratio, on the dyno see where the EGT peaks out at. Remember that number, that is your number you want to be at all times whenever you make changes then. It will ensure you are fairly close to a good a/f ratio when you go back to retune.

Dixit

 

I tapped the probe directly into the exhaust manifold within 2 inches of the exhaust port which is what the destructions called for.

 

This is good advice.

 

fairly close yes, but keep in mind egt readings on a dyno are different, usually off by ~50deg. usually wont matter, but if you are right on the edge, watch it.

 

This is true, but to solve that issue, once you have the car tuned, make a few runs and see where the EGT peaks at, BAM! thats your reading for the perfect a/f you just came out the dyno with.

Dixit

 

Did you guys do install the probe yourself (can this be even easily done?) or did you guys take it to a shop to install it?