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Help with building your Speeduino, installing it, getting it to run etc.
By toddTR6
#46063
I've been trying to decide where to put the O2 sensor (Bosch Lsu 4.9) A search of the interwebs is telling me either 2", 20", 24" or 40" from the exaust port. :roll: Seems that the interwebs can't agree with itself :roll: I looked for Bosch data sheet for it, but they are not specific, only that the temp should be in a specific range.

Can any one tell me what a suitable distance is for the sensor to have a decent length of life and still be accurate? Does it make much difference?
By LAV1000
#46072
Sensor has its own heater.
2" seems to me to close but 20" and above should be fine.
The further away the more delay in the signal.
But there is a setting in Tuner Studio where you can put in your delay.
User avatar
By PSIG
#46092
toddTR6 wrote:
Mon Oct 26, 2020 9:28 pm
I've been trying to decide where to put the O2 sensor (Bosch Lsu 4.9) … Can any one tell me what a suitable distance is for the sensor to have a decent length of life and still be accurate? Does it make much difference?
I've posted the installation spec's below. In a general sense, closer is better, but not so close it overheats (>600°C wrench hex temperature continuous is the critical spec). As-mentioned, it also has a heater allowing you to place it further down the exhaust if you prefer for any reason, such as reading two engine banks for average Lambda/AFR or temporary placement at the tailpipe for dyno use, etc.
Bosch wrote:4.3.1 Design measures:
- Locate sensor as close to the engine as possible, respecting max. allowed temperature range
- The exhaust pipe in front of the sensor must not contain any pockets,
projections, protrusions, edges flex-tubes etc. to avoid accumulation of
condensation water. A downwards slope of the pipe is recommended.
- Make sure, that the front hole of the double protection tube does not
point against exhaust gas stream.
- Attempt to achieve rapid heating-up of the exhaust pipes in the area in
front of the sensor and also of the complete sensor thread boss area, to
avoid developing of condensation water
- The sensor thread boss must be designed as shown in 4.9 to reach a rapid
heat up of the sensor protection tube area. Make sure, that the protection tube is fully reaching into the exhaust gas stream.
Bosch_LSU4.9_boss_specs.jpg
Bosch_LSU4.9_boss_specs.jpg (52.86 KiB) Viewed 128 times
By tylerwerrin
#46611
Glad to see you are still working on the TR6 conversion! I too have been going very slowly, as I have been away from my car for the past couple months and finally have a couple weeks to work on it again. I have been trying to gather up all the parts, as well as familiarize myself with the Speeduino & tuning program.

Per your suggestion, I picked up a silverado harness as well as the accompanying coil packs. I'm still waiting on the manifold & plenum to be fabricated, as it is a custom job by a fine gent I met on the Triumph Experience forum. I can give you his information if you are interested - it looks like a very fine polished piece.

Good luck moving forward - will be following your posts eagerly. If I get ahead of you (which i doubt I will), I'll post some pictures.

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