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puddy's Avatar
 
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O2 sensor bung placement after turbo

I noticed that my Innovate Motorsports AFR gauge instruction said to install the O2 sensor 24" down from the turbo. My rarelyL8 hooligan has a bung right after the turbo, about 2" away. Will this affect the operation of the AFR gauge? I assume the bung where Brian placed it must be OK and typical or else he wouldn't have put it there. Should I get a new bung welded in further down the muffler tube or just leave as is?

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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 04-23-2018, 04:59 AM
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That's where I've got mine mounted and everything here I've ever read has confirmed such - I'd not move it.

Long as you're not mounted at the low point (moisture pool) you're good.
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Paul... CT | '87 930 | '08 M3 6gang vert |
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| '07 S6 | '98 M3 vert | '01 M5 | '96 993 C2 cab | '05 S600 Sport - biturbo V12@Just Not Right 495rwhp / 612rwtq |
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Old 04-23-2018, 06:23 AM
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Thanks for confirming! I'll leave as is.
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 04-23-2018, 06:55 AM
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You can get a 1" deep mounting bung that will keep the tip of the sensor out of the direct exhaust flow. However i've never used them.
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 04-23-2018, 08:57 AM
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PullinMyPuddy, for what it's worth, the model of sensor that Innovate AFR meters use did not last long for me in that location (burned up and started throwing error codes within a few months of use), so I used their bung extension, that you mention above, and also made my own heat diffuser out of perforated steel that wraps around the sensor. Can't say for certain those would have been the cure, as I gave up on Innovate after repeated problems with my LM2 and have been using a PLX meter (different model of sensor with those, too) for several years without issue (with the Innovate bung extension/heat sink and my homemade diffuser).

Last edited by Rawknees'Turbo; 04-23-2018 at 09:26 AM..
Old 04-23-2018, 09:23 AM
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Yeah, you never want your bung hole too deep
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 04-23-2018, 09:30 AM
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Quote:
Originally Posted by Tippy View Post
Yeah, you never want your bung hole too deep
Especially when it comes () to JustTheTIPpy !!!
Old 04-23-2018, 09:31 AM
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Chain fence eating turbo
 
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Quote:
Originally Posted by Rawknees'Turbo View Post
Especially when it comes () to JustTheTIPpy !!!
People are wondering why I am laughing in the office...
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 04-23-2018, 09:34 AM
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Quote:
Originally Posted by Tippy View Post
People are wondering why I am laughing in the office...
Nice - off task computer usage!
Old 04-23-2018, 09:35 AM
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Chain fence eating turbo
 
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Quote:
Originally Posted by Rawknees'Turbo View Post
Nice - off task computer usage!
Working lunch break..........kinda.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR P & C's, soon to be 993SS cams and GSXR 750 ITB's fed by 964 intake, Borg-Warner S366 turbo @ 1.4 bar, Treadstone full bay IC, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MegaSquirt 2 (v3.57 board) w/EDIS, Tramont wheels (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
Old 04-23-2018, 09:42 AM
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There's Rawknees, he's back!

Alright, i'll use what i've got and see what happens. I'll look for a deeper bung hole if needed. Butt of course!
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 04-23-2018, 09:46 AM
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And consequently I also have had innovate in that spot and haven’t had much trouble with it there. My plx has taken its place in that spot and I’ve moved the innovate after the muffler only because it made more sense with wire length and such after going efi.
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Old 04-23-2018, 10:24 AM
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I was freaked out with the possibility of cooking the sensor that close to the turbo. Yeah, Innovate offers a heat sink, which probably addresses the issue. For me, I installed a "bung hole" at the exit of the muffler, upstream from the tail pipe as far as I could get it. The only downside is that at idle one might possibly see a leaner mixture than actual due to low volume of exhaust gasses and possible mixing with atmospheric air. But who cares at idle; it's all about accurate readings with your foot to the floor.
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Old 04-23-2018, 06:24 PM
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Mine is in a similar position in the RarelyL8 zork - about 2" behind turbo exit. The Bosch sensor has lasted several years of extreme abuse so far.
Alan

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Old 04-23-2018, 07:52 PM
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