[jzepeda]

What location would you guys recommend to weld in the EGT bung(s) as well a O2 bung(s) on a set of AR Catless DP. should I weld them on both pipes?

Thanks,
Jorge

[C4sF80M3]

Technically you should weld them to exhaust manifolds to get a more accurate reading. But if you have to weld them to the DP's, the closer to the turbine the better. EGT's drop quick after they leave the head.

Originally Posted by jzepeda

What location would you guys recommend to weld in the EGT bung(s) as well a O2 bung(s) on a set of AR Catless DP. should I weld them on both pipes?

Thanks,
Jorge

[O-cha]

Originally Posted by c4s335i

Technically you should weld them to exhaust manifolds to get a more accurate reading. But if you have to weld them to the DP's, the closer to the turbine the better. EGT's drop quick after they leave the head.

Lol, yea put an o2 sensor pre turbo and see how long that lasts

As for the EGT, a single egt, especially in the DP is pretty useless, you need 1 per cylinder right at the exhaust ports to get any real data.

[jzepeda]

So your saying it's worthless to get readings of EGT's from the DP's? how would I tap into the exhaust manifold? isn't it cast?

[Tee212]

Readings would be off about 50 degrees from dp vs exh mani. Yes ppl tap the EGT probe into the cast mani all the time (me included).

[jzepeda]

Originally Posted by Tee212

Readings would be off about 50 degrees from dp vs exh mani. Yes ppl tap the EGT probe into the cast mani all the time (me included).

anyone have a pic? your pretty local where did you get it done at? and how much was it?

[Tee212]

Sorry I didnt mean on my 335. I use to build engines (honda/toyota) and tapping the known hottest port runner on the exh manifold would be the common practice for most accurate EGT readings. Any reason you need EGT gauge?

[jzepeda]

I just want to log EGT's when I track the car. Also hoping to tune the car with Cobb ATR when it comes out. I also just wanted to get them welded in before I install them so I don't have to pull them down again. Where is the most common place to add an EGT bung on the DP for a 335i? and for tuning would it help to have an extra set of O2 bungs? or am I just wasting my time?

[Tee212]

You can tap a hole near or at the collector on the exh mani. Common place for the WBo2 bung would be 6 inches off the dp.

[jzepeda]

I really want to avoid taking off the turbos. How far off will the temps be if I tap the DP near the v band?