E-Bodies.org Cuda Challenger Forum

Technical Shop => Exhaust => Topic started by: 70pumpkin on July 28, 2019, 09:38:23 AM

Title: Torn on where to install O2 bung for Holley efi
Post by: 70pumpkin on July 28, 2019, 09:38:23 AM
TTI can install the O2 bung at the collector or the reducer adapter (about 6 inches downstream of the collector).  If TTI does the bung, it doesn't void their warranty and the entire header gets coated at the same time.

Here's where I'm torn: Wait time for the collector bung is 4-6 weeks while the reducer adapter is just 1 week.  However, I'm installing the Holley Sniper efi and the best location is at the collector - the reducer adapter is okay but if there's a leak at the flange, it will confuse the efi.

Do I just wait or compromise with the reducer adapter?
Title: Re: Torn on where to install O2 bung for Holley efi
Post by: RUNCHARGER on July 28, 2019, 10:57:31 AM
Tough call. It really is better in the header collector. Good gaskets will help though and you can turn them to get the leads facing exactly where you want while making sure the sensor is pointing slightly down.
Title: Re: Torn on where to install O2 bung for Holley efi
Post by: 303 Mopar on July 28, 2019, 07:55:09 PM
Patience.....do it once and do it right
Title: Re: Torn on where to install O2 bung for Holley efi
Post by: 70 Challenger Lover on July 28, 2019, 08:05:23 PM
I agree. Wait. The fact that they coat it is a bonus. Should look nice and clean.
Title: Re: Torn on where to install O2 bung for Holley efi
Post by: 70pumpkin on July 29, 2019, 08:07:49 AM
Thanks for the opinions.  I'm going to put the bung in the collector, but summer is almost over!
Title: Re: Torn on where to install O2 bung for Holley efi
Post by: 70 Challenger Lover on July 29, 2019, 08:38:44 AM
Sounds like a great off season project to me!
Title: Re: Torn on where to install O2 bung for Holley efi
Post by: 70pumpkin on July 29, 2019, 11:34:08 AM
Holley suggests installing the buns at 2 and 10 o'clock so the sensors point slightly downward.  Would this slight angle interfere with anything?  Otherwise, 3 and 9 o'clock is the safe bet.
Title: Re: Torn on where to install O2 bung for Holley efi
Post by: Brads70 on July 29, 2019, 02:40:24 PM
Quote from: 70pumpkin on July 29, 2019, 11:34:08 AM
Holley suggests installing the buns at 2 and 10 o'clock so the sensors point slightly downward.  Would this slight angle interfere with anything?  Otherwise, 3 and 9 o'clock is the safe bet.
They suggest that because moisture build up on them shortening the lifespan. Mounting them on an angle downwards  uses gravity to let it run off. Also helps with ground clearance. 
Title: Re: Torn on where to install O2 bung for Holley efi
Post by: GoodysGotaCuda on July 29, 2019, 04:03:05 PM
In the header is best to minimize the number of potential leak points upstream of the oxygen sensor. That's where my Hemi sensor is.