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Microtech Closed loop

Old 07-10-03, 01:29 PM
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Closed loop

Does the Microtech operate in closed loop?

Thank you,
Craig K
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Old 07-10-03, 02:06 PM
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Nope. There's been some discussion about that topic before - a quick search should reveal it.

Brandon
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Old 07-14-03, 12:43 PM
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Brandon,

I was looking for an answer to this question myself. I used the search but did not really get a complete answer.

Can I tune my ltx 8 with a wideband ?

What will the narrow band do for me?
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Old 07-14-03, 08:45 PM
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I don't understand the question of can you tune your MT with a wideband? How else were you planning on doing it?

The WB will not directly interface with the LTX8. The narrowband is as always pretty much useless. I got dang good gas milage to and from the BBQ in central FL with no closed loop, even with some jaunts to 130ish MPH, some tuning ect racing some FD's.

Daniel
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Old 07-14-03, 09:59 PM
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Originally posted by BlackFC
I don't understand the question of can you tune your MT with a wideband? How else were you planning on doing it?

The WB will not directly interface with the LTX8. The narrowband is as always pretty much useless. I got dang good gas milage to and from the BBQ in central FL with no closed loop, even with some jaunts to 130ish MPH, some tuning ect racing some FD's.

Daniel
I am not too well versed in this, so forgive me if my question sounds stupid. I guess I do not understand how the wideband works.

Here is my question. I have a downpipe, nothing has been tapped into it. I was going to weld in a bung, so that I could use a wideband to tune, can I do this? is this correct to do this?

If the microtech does not run in closed loop I do not need a o2 sensor, tapped into the downpipe for operation right?

However, I should put one in for the wideband correct?
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Old 07-14-03, 11:07 PM
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You've got it. You'll use the WB O2 like an oil temp gauge, for example - it won't effect the ECU's operation, but it's still useful for tuning.

Brandon
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Old 07-15-03, 08:53 PM
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Make sure you get the bung tapped in as far away from the turbo as you can. If you are going to put it on the downpipe, make it as low as possible.

The heat from the exhaust effects the sensor if it is too hot, and it is too hot after the turbo.
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Old 07-16-03, 02:59 AM
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Piranha, if its too far away from the exhaust port it will NOT give correct readings, which could be bad news.

Dan
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Old 07-16-03, 06:29 PM
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Not necessarily. The Bosch LSM11 shouldn't see temps over 600degC (1112degF) sustained, with 800degC being a maximum permissible for short bursts (rated 200h). The lower limit is 150degC (302degF). The sensor controller can compensate for EGT when calculating the mass ratios (unlike some ECUs which just give a mV reading).

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Old 07-16-03, 11:25 PM
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Originally posted by Piranha
Make sure you get the bung tapped in as far away from the turbo as you can. If you are going to put it on the downpipe, make it as low as possible.

The heat from the exhaust effects the sensor if it is too hot, and it is too hot after the turbo.
I was told, to put it as close to the turbine as I could get it, for accurate reading.

AND I HATE THE ******* POST OFFICE!!!! the envelope that the bung was in showed up today....big hole in the side. No bung to be found anywhere.
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Old 07-19-03, 07:02 PM
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The Ideal location for an additional bung is 18 " from the turbine. Yes it works. Yes it is far more accurate than directly behind the turbine. And yes, it allows more precise tuning.

Your opinion is wrong ;P
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Old 07-23-03, 12:15 PM
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You know, any hardware (nut, bolt, fastener) can locally supply you with a bolt to fit the O2 sensor. This is what I did on my downpipe. I believe it cost $1 per bolt. The size is 18mm x 1.50.
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Old 07-24-03, 09:23 AM
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Originally posted by Jesuscookies
I was told, to put it as close to the turbine as I could get it, for accurate reading.

AND I HATE THE ******* POST OFFICE!!!! the envelope that the bung was in showed up today....big hole in the side. No bung to be found anywhere.
For a wideband, specifically the L1H1 sensor?

Well, no. If you go on to techedge's site they explain why you *shouldn't* do that. The sensor is supposed to always be at a certain temp, and that is why it has a heater. If it gets too hot, gasses are moving too fast. It reads through partial pressure of gasses, since it can't really compare to open air.

If that was also the case, they wouldn't put widebands in the tailpipe.
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