NTK L2H2 New Linearisation

Pin outs, sensor calibrations etc
TimH
JT Innovations
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Re: NTK L2H2 New Linearisation

Post by TimH »

I've only ever had reports of 0.01 lambda errors from the NTK around the lambda=1.0 region (which is .15 AFR). Something doesn't sound right if you're seeing .5 AFR (.03 lambda).

Which linearisation are you using?
CT9A
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Re: NTK L2H2 New Linearisation

Post by CT9A »

I am using the LZA09 linearisation from the sensor database, the other options are NTK Lambda L2H2, LR NTK Lambda and LR NTK Lambda(L1H1).
TimH
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Re: NTK L2H2 New Linearisation

Post by TimH »

Might be worth trying the "L2H2" linearisation. I know at one point Syvecs used a pattern part with a different linearisation and I wonder if the files have been muddled up?

For example. 2.502 volts give 0.999 lambda for the "LZA09" linearisation but 1.057 lambda on the "L2H2". The "L2H2" is, in theory, the same sensor as the LZA09, so not sure what's going on there.

Would really welcome some input from the mappers who use them all the time! Or Pat :)
stevieturbo
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Re: NTK L2H2 New Linearisation

Post by stevieturbo »

Ive an LZ on mine.

Being an S6, I only have the ecu monitor 1 bank of my V8.

On the other I have a 15 year old FJO Wideband that uses an L1H1, the original wideband ! Most of the time both banks read the same...under some loads they varied.

This caused me concern, so I bought a PLX Wideband that uses the LSU4.9 and installed this in same pipe as the FJO. To my surprise they both read pretty much bang on the same.

At a later date I changed my inlet manifold, and this actually brought AFR's on both banks closer more often. So I've no reason to think the LZA does read any differently than the others.

I do keep meaning to put the PLX wideband into the other pipe along with the Syvecs/LZA sensor....just havent bothered doing it yet as never had any issue or anything that caused me concern that either may not read as they should.

Using Tim's reference value of 2.502v, my scaling is 14.69AFR ( Lambda sucks ;) ) which is same as Tims LZA09 scaling.

Used same on other cars with no concerns either although havent ever connected another wideband to verify readings. My would be closest to doing that as above.
RICE RACING
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Re: NTK L2H2 New Linearisation

Post by RICE RACING »

CT9A wrote:Dyno uses a NTK wideband sensor, I think it is the same as a AFR500, it was measured at the back, I know not the best place to get accurate readings, especially at low airflow.

I welded another bung next to the LZA09 and mounted a older LSU4.2 sensor, I calibrated the wideband in the syvecs to read almost the same. It was off by 0.5 AFR. Still think there must be a better way to calibrate the LZA09. I will try again soon with a friends Autronic model B wideband. That one has a lab grade NTK sensor.
I highly recommend you do this.

Have had my own Autronic Model B with the lab grade NTK sensor since 2005 and I always use this to calibrate sensor curves on other devices (or check the claims of the latest 'wonder meter'), I trust it 100%.

Used most of the others mentioned here (some shockingly bad, others just not accurate despite being costly) and personally recommend you check and validate your own curve for any sensor you fit up that is run by the ECU. You just need a meter you can trust, easier said than done.

p.s. with the Autronic Model B if you want to check out base settings, feel free to pm me, they can be set up for rich span correction which most techs do even for the lab grade sensor. I can take a look at your friends settings if you like. FYI the Autronic supplied NTK lab grade sensor is $980Au v's around $250Au for the ones used here.
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RICE RACING
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Re: NTK L2H2 New Linearisation

Post by RICE RACING »

Cheap NTK's are just that and need to be checked against a proper LAB Grade NTK sensor and equipment to drive it.
Autronic Modle B with brand new sensor V's the one discussed here and sensor Data Base default file.

Its pretty rough and totally useless for lean measurements as you can see!

RIG
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Sensor set up
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Out of box default
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Proper curve!
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Difference to fist lot of sample points, each one done twice
2nd test with proper curve, works in 'rich' and 'lean' a reading you can trust :)
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I can calibrate people sensors if they wish, just PM me, for a nominal fee of course! :mrgreen:

Image
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RICE RACING
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Re: NTK L2H2 New Linearisation

Post by RICE RACING »

Obviously above is just shown as the first 'rough' curve, It ends up taking about 4 iterations then final hand trimming of the curve point by point to make it track +-0.001 Lambda across the zones (total probably 4 hours work doing it right). Just complete one of these for a customer and its accurate and precise once calibrated correctly.

Image

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CT9A
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Re: NTK L2H2 New Linearisation

Post by CT9A »

Thanks for posting this info, I bought the Autronic model B with a good low used NTK sensor. I will buy a new sensor anyway, then we can calibrate the cheaper NTK for Syvecs use.
stevieturbo
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Re: NTK L2H2 New Linearisation

Post by stevieturbo »

CT9A wrote:Thanks for posting this info, I bought the Autronic model B with a good low used NTK sensor. I will buy a new sensor anyway, then we can calibrate the cheaper NTK for Syvecs use.
But all this makes the assumption your Autronic is correct....

I've 3 widebands on my car ( albeit one in a different pipe )

3 different controllers, and 3 different sensors ( original L1H1, LSU4.9 and Syvecs NTK LZA ). All 3 read very very close to each other. That would imply to me they read good, as it would be bloody impressive to get 3 totally different controllers/sensors to all read the same amount of wrong ! lol
RICE RACING
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Re: NTK L2H2 New Linearisation

Post by RICE RACING »

CT9A wrote:Thanks for posting this info, I bought the Autronic model B with a good low used NTK sensor. I will buy a new sensor anyway, then we can calibrate the cheaper NTK for Syvecs use.
If you need a hand just send me a PM ;) oh and congratulations :mrgreen: .
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