Wanted to borrow: Wideband

[teknoboi]

Hey guys, I've been slowly turning up my boost at the moment on the MR2, from 0.7bar to 1.0bar in the last couple of months of 0.5 bar increments every month or so. Running extremely rich on coming on boost. Would like to borrow a wideband and log the AFR's with RPM to see if its worthy of an SAFC. Its got a highflow ct20b with steel wheel. Considering the stock ct20b ceramic was rated at ~300rwhp, i was wondering what this highflow could do. It has a FZX garage ecu for a tuned car, but it seems to be running sweet with no problems at all! its very responsive and the higher the boost, the more top end it has. I've speculated that with the current richness, i could get a fair bit more power and the same or lower boost.



don't mind paying a rent fee or something like some alcohol or what not?

Have an integrated bung in the dump of my car, so it should just slot right in!
specifically for a wideband
Cheers =]

[Lump]

wideband shouldnt be placed in the dump, it needs to be a foot or 2 away from the turbine.
best way is just to set the boost you want & run it up on a dyno with a knock box & check afr's & tweak boost that way.
its only going to cost a measly couple of hundred

[teknoboi]

i just wanted to check what AFR's first. If they're up around 10, then its definitely worth doing, but if they're just running rich on boost and then tappering off under 12, then i wont bother? It could also be its running rich on idle etc?

bung is at the bottom of the dump:
http://img193.imageshack.us/img193/5331/p9300412.jpg

http://img706.imageshack.us/img706/6736/p5070495.jpg

[Lump]

according to my aem manual thats too close - especially since you want to borrow someones imo

[teknoboi]

i've seen a few aristo single conversions with the wideband bung next to the stock oxy sensor about 20cm from the exhaust housing. My bung is probably 40-50cm away from the exhaust housing?

Do you reckon it will damage it? Cause this is a Berk Technology dump which was well developed? Probably one of the Best dumps for the ct20b

[Lump]

only repeating what the aem manual says.
set it up on a dyno imo

[teknoboi]

I've just did a little reading on the placement on wideband's, specifically the LM-2. It states the closer to the rear housing the better. For more accurate readings. This is because some of the uncombusted fuel combusts later down the dump which givers a "leaner value"?

Maybe its all dependent on the the type of Wideband it is.

PS, the stock narrowband 02 sensor sits quite close to exhaust housing?

[Lump]

they normally all use a bosch 5 wire sensor which shouldnt get too hot.
my sensor read exactly the same afr as the dyno sensor (up the exhaust pipe) so that sounds sus to me.

stock narrowband sensor & 5 wire are not the same - the stock one is fine up close.

bear in mind the aem manual gives advice on how to prolong the life of the sensor & get the most out of it.

[teknoboi]

icic, but with a rich mixture, the temps shouldnt be that high, or else it would be popping like a bitch!

I think i may have access to an LM-2. ill have a read what that manual says!

PS, do you run a cat?

[teknoboi]

On NON-CATALYTIC converter vehicles:
Exhaust Clamp: With non-cat cars, you can simply take the reading from the car’s tail
pipe; however, you MUST use the optional Exhaust Clamp to do so. Do
NOT simply insert the O2 sensor into the tail pipe. Doing so may
damage the sensor and it will certainly not yield accurate
measurements. (The oxygen sensor needs to have its cable exposed
to outside air to yield the most accurate results.)
……or………
Bung: You have the option with non-catalytic cars to also use a Bung as
described above. Use of a bung is the preferred method for mounting
the 02 sensor for both catalytic and non-catalytic cars.
On TURBO CHARGED vehicles:
Bung: Install the bung downstream from the turbo before the catalytic
converter. The high exhaust pressure before the turbo interferes with
the lambda measurement and the high exhaust temperatures
encountered there can damage the sensor.
Do NOT install the Bung below the 3 o'clock or 9 o'clock position.
Condensation can form in the exhaust pipe and permanently damage the sensor.
6 o’clock is the absolute worst position to mount the sensor.

[Lump]

yes i ran a cat.

[teknoboi]

3. Installation
3.1. Mounting the sensor using a Bung or Exhaust Clamp.
Using a bung is the preferred method for mounting the O2 sensor for both catalytic and
non-catalytic cars.
On CATALYTIC CONVERTER equipped vehicles:
Bung: Install the oxygen sensor’s bung upstream from the catalytic converter
(a bung and plug is included in the LM-1 kit). Any decent muffler or
exhaust shop can do this for you. The wide-band oxygen sensor is then
installed into the bung to take a reading. (Insert the plug into the bung
when not in use). The bung must be installed in the exhaust pipe at
the side or on top, NOT on the bottom of the exhaust pipe. Best
position is between 10:00 and 2:00 position.
……or………
Exhaust Clamp: You may use the optional Exhaust Clamp to mount the O2 sensor to the
car’s tail pipe when taking readings from cars with catalytic converters
(see below). However, it is recommended instead to use the bung (as
described above) to give you the most accurate reading. Measuring
after the cat will result in leaner-than-reality readings, depending on the
- 5 -
efficiency of the cat. Some operators of chassis dynos use this method
and roughly “correct” the reading.