o2 sensor on Hooker
Safety Car
Joined: Mar 2007
Posts: 3,652
Likes: 49
From: Bridgewater nj
On a fuel injected 40 ******* and a sportster I did with a slightly baffled exhaust, I had problems with the 02 sensor getting a good reading. Open exhaust like side pipes pull in clean air at idle. I had to locate the sensor right off the head and that means it was monitoring only that cylinder or with a baffled exhaust you can weld the bung at the collector.
Racer
Joined: Nov 2001
Posts: 355
Likes: 1
From: Pennsville NJ
I installed one on each side, in the collector, and as close to the frame as I could. Sorry I don't have any pics. I started off running the Holley Commander 950 EFI kit in 2005, switched to the Holley HP EFI this past summer. Sensor seems to read fine in the installed location. Don't have any problems with it tuning my car. The other side I have another wideband connected to an AutoMeter wideband gauge. I've been using it for years, since the Commander kit had only come with a narrow band O2.
Thread Starter
Drifting
Joined: Mar 2011
Posts: 1,347
Likes: 121
From: Kernersville NC
I installed one on each side, in the collector, and as close to the frame as I could. Sorry I don't have any pics. I started off running the Holley Commander 950 EFI kit in 2005, switched to the Holley HP EFI this past summer. Sensor seems to read fine in the installed location. Don't have any problems with it tuning my car. The other side I have another wideband connected to an AutoMeter wideband gauge. I've been using it for years, since the Commander kit had only come with a narrow band O2.
Melting Slicks
Joined: Dec 2009
Posts: 3,224
Likes: 652
From: Thunder Bay
I have one in my '79 with Hooker Super Comp headers. Its in the left collector and I did it when the header was out of the car. Not a big deal. Drill a hole. Weld in the bung. Position the sensor at about 2:00 so the end of the sensor points slightly down to prevent moisture from accumulating in the end.
Racer
Joined: Jan 2005
Posts: 370
Likes: 77
From: Perth Western Australia
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Racer
Joined: Nov 2001
Posts: 355
Likes: 1
From: Pennsville NJ
I left mine in place when I did the installation. I wanted to make sure placement was going to be ok and not have any surprises.
Thread Starter
Drifting
Joined: Mar 2011
Posts: 1,347
Likes: 121
From: Kernersville NC
Thanks so much for the pic and info wabco and VTHokei. Exactly what I needed. Do you think you get good solid readings in that location? I'm running homemade glass packs inside so I do have some backpressure. What do you have?
Racer
Joined: Jan 2005
Posts: 370
Likes: 77
From: Perth Western Australia
I was using STS baffles but now have classic chambered exhaust inserts. The AF readings look consistent with both.
Race Director
Joined: Jun 2000
Posts: 10,039
Likes: 668
From: FL
Mine are slightly back from that, actually in the first part of the sidepipe right where it necks down. Mechanic did it there due to FAST's recommendation. I have STS baffles and it fluctates a bit at idle but clears up by 1500 rpm. I want to go with EFI this winter so will probably have two more bungs installed further forward (right where you have them).
Racer
Joined: Jan 2005
Posts: 370
Likes: 77
From: Perth Western Australia
Mine are slightly back from that, actually in the first part of the sidepipe right where it necks down. Mechanic did it there due to FAST's recommendation. I have STS baffles and it fluctates a bit at idle but clears up by 1500 rpm. I want to go with EFI this winter so will probably have two more bungs installed further forward (right where you have them).
With the new bung welded in the sensor will be directly behind its current position but up higher so that it sits parallel with the frame and have about 1/4" clearance.
Racer
Joined: Sep 2008
Posts: 454
Likes: 7
From: SB County CA
Wabco,
Just a question/thought...are you sure 1/4" clearance will be enough considering engine movement? I ask because I did something similar using an SRIII frame, but because my frame uses two longitudinal bars it takes up more vertical distance. The bars have about 1 1/2" space between the upper/lower so I have the sensor straight into the collector (horizontal and parallel to the ground) with about 3/8" clearance above/below. I was concerned about it hitting the frames rails under engine torque so I built an engine stabilizer bar. Wish I had pics, but I'm away from home for a while.
I was wondering if I could bend the O2 sensor about 90 degrees without damaging it...so that it would enter the collector parallel to the ground and totally clear the frame if engine movement exceeded the clearance...?
ps, I'm not running yet cuz I'm stuck in painting process purgatory...
Beautiful car, by the way...one of my favorites!
v/r,
Rob
Just a question/thought...are you sure 1/4" clearance will be enough considering engine movement? I ask because I did something similar using an SRIII frame, but because my frame uses two longitudinal bars it takes up more vertical distance. The bars have about 1 1/2" space between the upper/lower so I have the sensor straight into the collector (horizontal and parallel to the ground) with about 3/8" clearance above/below. I was concerned about it hitting the frames rails under engine torque so I built an engine stabilizer bar. Wish I had pics, but I'm away from home for a while.
I was wondering if I could bend the O2 sensor about 90 degrees without damaging it...so that it would enter the collector parallel to the ground and totally clear the frame if engine movement exceeded the clearance...?
ps, I'm not running yet cuz I'm stuck in painting process purgatory...
Beautiful car, by the way...one of my favorites!
v/r,
Rob
Last edited by Postal123; Oct 4, 2013 at 11:39 PM.
Racer
Joined: Jan 2005
Posts: 370
Likes: 77
From: Perth Western Australia
Wabco,
Just a question/thought...are you sure 1/4" clearance will be enough considering engine movement? I ask because I did something similar using an SRIII frame, but because my frame uses two longitudinal bars it takes up more vertical distance. The bars have about 1 1/2" space between the upper/lower so I have the sensor straight into the collector (horizontal and parallel to the ground) with about 3/8" clearance above/below. I was concerned about it hitting the frames rails under engine torque so I built an engine stabilizer bar. Wish I had pics, but I'm away from home for a while.
I was wondering if I could bend the O2 sensor about 90 degrees without damaging it...so that it would enter the collector parallel to the ground and totally clear the frame if engine movement exceeded the clearance...?
ps, I'm not running yet cuz I'm stuck in painting process purgatory...
Beautiful car, by the way...one of my favorites!
v/r,
Rob
Just a question/thought...are you sure 1/4" clearance will be enough considering engine movement? I ask because I did something similar using an SRIII frame, but because my frame uses two longitudinal bars it takes up more vertical distance. The bars have about 1 1/2" space between the upper/lower so I have the sensor straight into the collector (horizontal and parallel to the ground) with about 3/8" clearance above/below. I was concerned about it hitting the frames rails under engine torque so I built an engine stabilizer bar. Wish I had pics, but I'm away from home for a while.
I was wondering if I could bend the O2 sensor about 90 degrees without damaging it...so that it would enter the collector parallel to the ground and totally clear the frame if engine movement exceeded the clearance...?
ps, I'm not running yet cuz I'm stuck in painting process purgatory...
Beautiful car, by the way...one of my favorites!
v/r,
Rob
At first I was thinking the same thing however there is very little movement at the collector. Even though the side pipes are rubber mounted they still hold everything tight.
I trimmed my rocker mouldings with about 1/8" clearance from the primary tubes and have not had any issues with hitting (then again I drive pretty conservatively).
I've also got the sensor mounted in the right collector and as the engine torques it should pull away from the frame, not that it helps you having it mounted between the bars of a SRIII frame.
I think with 3/8" clearance above/below the sensor and your using a stabilizer bar you shouldn't have any problems.
Brad
Last edited by wabco40; Oct 5, 2013 at 03:28 AM.
Racer
Joined: Sep 2008
Posts: 454
Likes: 7
From: SB County CA
Thanks! That's nice to know. Was thinking about what a mess it would be if occasional interference caused a hairline crack at the weld that could draw in air. The domino effects that a mod brings along never ceases to amaze me. It does keep things interesting though.