ThaoDao

I have an ETS downpipe, but when I ordered it I forgot to add the wideband bung on. Now I have to remove the downpipe from my car and get the bung weld on, but that's a lot of works. I'm thinking welding o2 bung on my test pipe instead, but a friend of my told me that it reads less accurate on the test pipe. Is that true? Can I just drill a hole on my downpipe without removing it?

Kartyman550

iTrader: (1)

Ah, I wouldn't worry about it. I mean the best reading is on your down pipe on a 15 degree angle as close to your turbo as safe so... If you have a safe tune you;ll be alright

the 10th 1dr

Down pipe afrs are more accurate than test pipe afr readings. By how much, i am not sure.

sgtr275

iTrader: (6)

I would be curious to know where you got that information from.

But to answer ThaoDao, it shouldn't make any difference.

errdisab1e

iTrader: (2)

I'm not sure but another variable could also be the wideband sensor + afr gauge brand. I have the Prosport Halo AFR that came with a Bosch 4.9 o2 sensor. It reads -1 lower than what my tuner was reading. (Ex: on 3rd gear WOT, gauge shows 11.xx and tuner's screen was 12.xx)

Tuner had his sensor on the left exhaust pipe. My wideband is on my DP. I have a MXP short DP

If your concern is geared towards monitoring vs tuning off of your gauge, I would note what your AFR readings are and monitor for changes

ravenjam

I welded a second bung into my test pipe for my wide band. I compared my readings to that of my tuner's reading from the tail pipe, the readings were a spot on.

bluescoobywagon

Provided there are no leaks before the test pipe, the readings will be accurate, but they may be slightly delayed. On a map with fairly consistent fueling, it wouldn't have much effect.

ikt

iTrader: (18)

AEM makes a kit where you can just tap in and use a band.