Downpipe question
 

Hi,

i have an easy question. I recently bought a hks downpipe for stock twins, got it sand blasted and now want to get it ceramic coated. before i do this i want to add a weld-in bung for a wide band 02 sensor. I know that the bung has to be either 3 o clock (-10°) or 9 o clock (+10°) position. My problem is we have winter time here an i cannot check how exactly the downpipe is mounted to find the correct position for the bung. For that i'd like to ask you. I made the following picture:

http://i62.tinypic.com/nmbuoo.jpg

Is the connecting flange to the cat in 100% horizontal position (180°)? Or is the bracket in vertical position (0°)? that would mean the flange holes are not exactly 180° ... another option is that the flange to the turbos is in 0° position. What is it? Some of these must be in a tilted position, but i don't know which one(s) ...

Thanks for your help.

it pretty much goes in the car just how it is in that picture.. it doesn't have to be perfectly 10 degrees, but roughly around to prevent premature failure of the 02 sensor

well, 10° is very small, the bracket has about 20° tilt ... i'd like to do it accuratly.

I have an HKS downpipe and recently had to redo my bung. I wasn't satisfied with what the shop did as it was sitting too low to the ground for my liking.

Attached is a pic of the new bung location. (Old one has a plug in it now.) Hope this helps!

Attachment 633833

thanks for the pic. what angle is your new bung when the downpipe is installed? is it the same position like the flange hole on the right site?

It is at a 90 degree angle. I should also note that I needed to have it sit flat in order to use the Innovate wideband 02 sensor heat sink properly. The way I had it before....it would have scraped the ground.

I had the Dp on the car and marked where I wanted the o2 bung (with the heatsink and o2 sensor screwed in). I got the wiring routed under the passenger footwell area. Had to drill a hole into the floor, but it is sealed with a rubber grommet. Some people route it through the shifter, but I didn't like the idea of having my wiring routed that way. Up to you.

Best of luck!

just to be sure that i understood you: concerning your picture your new bung hole lines up with the flange holes. If thats correct and your bung is 90°, than the flange is in 180° horizontal positions while the bracket is tilted. can you confirm this? Do you have a left hand drive car? I ask because it would not make much sense to do the bung on the right site on a right hand drive car when you wan to route the cables through the passenger footwell area. Is there anything else influencing 3 or 9 o clock position or is there enough space in both directions?

I wouldn't say it is perfectly lined up with the flange holes, but it is really close. As long as you are close, you shouldn't have a problem with it working as I left some wiggle room for movement. Correct, I drive a lhd fd.

assuming the flange holes are in horizontal position then your bung is a bit more to the top (-10°) right? a picture from below of a stock car would solve this issue, but google has no :S.

I unfortunately do not have a good picture of the downpipe on the car. I'll be out of town for a few days, but I can get you a picture when I get back.

that would be great! thank you and merry christmas!