was looking at the following downpipe

Tanabe - $279 @ MVP

-70MM SS
-Has welded EGT probe (w/ cap)

i thought you would install the EGT probe at the exhaust manifold and the o2 sensor on the downpipe? thanks for looking

 

You thought correct. EGT in manifold. O2 in DP. With EGT, the distance from the cylinders matters! For example, if you place your EGT after the turbo you could find the readings off (low) by over 150 degrees or even more depending...

 

do you think the EGT sensor is safe before the turbo?

I mean after the intense heating and cooling of the sensor I think it would get brittle and fly into your turbo. If you put it after the turbo it would probably shoot out the exhaust.

 

yes

 

NICE!

Now for individual AFR

 

Now that's overkill!

I agree with the probe being okay. They are pretty sturdy and are not likely to grenade themselves into the turbo.

Now I just have to work up the nerve to drill and tap my manifold so I can install mine. <gulp>

AC

 

good lord, I dont think I have ever seen anything like that before...

 

very nice

 

Very nice example...done well with the sensors are very close to the cylinders. Of course individual cylinder temps are desirable as some burn leaner/hotter than the others :>

 

I went with the Tanabe and love it. I thought long and hard over the individuals and decided to go single in the dp. I started out with it stock to determine EGT before mods, so I would have an idea of what it should be. There is some leveling going after the turbo that you will never see but, since I don't beat the hell out of it, it should be ok. By-the-way, if your probe does come apart downstream, it won't grenade your turbo.

 

4EGTs, I've thought of doing that too.

It is a good idea, but the problem is those sensors have to be at the same distance and the same angle in realtion to the manifoldas the others, otherwise they aren't comparable. How much of a difference, well I really don't know. I think put one for cylinder #4(the leanest) and keep it at that for safety. Correct me if I'm wrong but that's my logic. I'd be interested in seeing how the readings varied between the cylinders on the setup pictured.

I didn't know the tanabe downpipe came with the bung welded in the downpipe, I may have to pick one of those up.

 

Just tap your leanest runner

 

That is what we used to do on NA V8 engines. I have heard experienced 4G63 tuners mention that they have seen cylinders burn/blow on each of the four...no one seems to be 100% sure which is really the leanest on average...

I saw number 4 suggested here. My logic suggests it will be the cylinder that naturally gets the most air...so is it really number 4?

 

IDK, I think it would be the runner furthest from the Throttle body? IDK>

 

Usually #4 (Cylinder furthest from the throttlebody) simply because its the furthest injector on the rail so fuel pressure is lowest at that point potentially resulting in a lean condition.