Hi all

I got a smoking deal on eBay on a brand new Tsukigi Racing full stainless steel system. It arrived a couple of days ago, I have mocked it up on my ZX 14 to ensure fitment, and am about to install an 02 bung in it somewhere.

The system is beautifully made, but.....

The two header pipes from cylinders one and two meet into a two pipe collector, which then necks down to a single outlet.

The two header pipes from cylinders three and four meet into a two pipe collector, which then necks down to a single outlet.

then the two single outlets from the pair of two pipe collectors meet a further two inlet collector, which then outputs into the single pipe out to the silencer.

I am trying to figure out where to install the bung for the wideband O2 sensor I will be using. The obvious problem is that the most convenient location physically to install the bung is in the two pipe collector into which the header pipes from cylinders three and four meet, meaning that any sensor readings would only be taken from cylinders three and four.....

there may also be enough clearance to mount the O2 bung into the pipe leading up to the silencer, which would then take readings originating from all four cylinders combined, but would be close to the silencer and possible entry of fresh air from the muffler outlet.

has anyone installed an O2 bung in a Tsukigi Racing full system or similar, and if so, where did you put the bung?

Paul

wat did ya pay?? Gonna be hard not riding her after you get that puppy installed!!! Damned snow storm!!! Damn city with no snow removal!!

$480.00 U.S. brand new in the box, plus $45 U.S. in shipping from southern California. Full stainless sytem, with stainless oval canister. I was happy with my titanium coated stock headers (cat removed) and Yosh titanium/carbon slips ons, but at that price for the Tsukigi Racing full system won by my EZBid sniper on eBay in the final seconds, I am a very happy camper with the Tsukigi ppurchase.

it is about -20 Celsius or so here right now, roughly -30 C with the wind chill, and unusually heavy snow. The ZX 14 is up on my HandyLift in my heated garage. I am preparing it to try and break 200 mph on the salt at Bonneville end of August, 2010, and I figured the full Tsukigi system might aid in the top end quest, after a full mapping to dial it and all the other changes in on an eddy current dyno booked for mid January 2010.

But, the question remains - where do I put the O2 bung....????

Paul

Horizontal Placement ~ Where the 2 pipes "COLLECT" into that housing, closest at the head. This way, it pokes the 02 snout at each exhaust pipe pulse. Thus, the most ideal location.

* Last updated by: Hub on 12/8/2009 @ 12:51 PM *

I will take a photo of mine for you. I had mine welded by the supplier i bought it from and it was placed in a way that seems to strongly favor two headers and perhaps not read the other two as much. The solution would be to have the sensor sticking out on top of the collector but I doubt there would be enough room for that. If you weld the bung down farther on the pipe, it will be located where the midpipe fits inside of (joins up to)the collector. You would have to cut a hole in the midpipe that matches up with the hole for the o2 bung.

Horizontal Placement ~ Where the 2 pipes "COLLECT" into that housing, closest at the head. This way, it pokes the 02 snout at each exhaust pipe pulse. Thus, the most ideal location.

I believe Hub is recommending the segment of pipe that is to the right (just downstream) of where my bung was located. The only problem is that the O2 sensor that sticks out of the pipe is about 2 1/2" inches long and then there is the wire that sticks out a little more. I don't know if there would be room between the pipe and the rocker arm. The other problem is that the segment of pipe where the 2 become 1 is a double layer of pipe -- a sleeve where the two pipes connect. You would have to make a hole through both pipes to admit the sensor. It would be possible to weld the bung so it is facing the other side of the bike but then it would be clearly visible and that would look crappy.

* Last updated by: Rook on 12/8/2009 @ 11:14 PM *

Thanks very much, Rook

That is one of the three locations I was considering for the O2 bung.

Clearly the bung in that location is prettty much limited to taking its readings from cylinders one and two. I wonder if that really makes much of a difference, short of installing 4 bungs and four wideband sensors and reading each cylinder individually......

the only location I can see that would result in the wide band sensor reading from all four cylinders is a little further up the connecting pipe between the collectors and the silencer, with the bung and sensor pointing into the rear shock linkage, if there is enough clearance after I lower the bike rear and front. I have just ordered the rear adjustable lowering links from Brock's (on sale) with the pin adjusters for three positions heights, don't yet know if putting the bung in the midpipe will allow the sensor to clear after the adjustable lowering links arrive and are installed.

so, I guess Rook's bung install is likely the best install location choice as long as it doesn't matter that the wide band sensor will then mainly be reading only two cylinders. The sensors are delayed and not precisely accurate anyway, but I wonder if being in the exhaust stream of all four cylinders is critical, or not...????

Paul

answered my own question by phoning Power Commander tech support.

they tell me that taking the O2 sensor readings from two of the four cylinders should be "close enough".

so, hopefully the other two cylinders will be similar to the two the readings will be taken from.....

Paul

The AT200 installation instructions recommend positioning the sensor in a place where "multiple cylinders collect." I have a Tsukigi system for my busa and it is not installed on the bike yet. I was able to look at the busa collector pipe where the 2 inlets come in and actually, exhaust from all cylinders could comingle there. It looks like the pipes are separated when viewed from the outside but the inner walls of the 2 pipes are cut away to make one chamber. I would still feel better having the sensor located centrally in this chamber or downstream a bit but I am not going to worry about that for now. Dattalogging for sepparate cylinders might give some indication as to whether the reading is biased to one bank or the other. Perhaps i will relocate the bung some time down the road.

I think we are in the clear, lav. You might want to check this thread out. Reading all cylinders won't tell you which one is leaner or fatter but if you're into it that much, you could hook up an EGT.

http://www.zx14.net/publicforum/index.php?topic=8817.msg76324#msg76324