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New Plx O2 Gauge With Bosch Lsu4.9 Sensor

cobrAA

By cobrAA,
in Engines & Forced Induction

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cobrAA Mentor

cobrAA

Posted
Posted

PLX came out with a new wideband gauge.. the biggest factor is the new bosch LSU4.9 sensor

http://www.plxdevices.com/product_info.php?id=WDBDSMAFR_DM6G4

The idea is cool.. but how useful it is if, for exemple, most, if not all, aftermarket ECU read through the the old LSu4.2 sensor.

It would be cool if the ECU could take this improved signal to offer a better tune. What's your take on this ? over-rated or should it actually provide a better tune ?

As for now, I prefer to have a gauge that tell me what the ECU read also ( instead of having a gauge more accurate than the ECU's signal)

Ben C34 Grand Master

Ben C34

Posted
Posted (edited)

What do you mean?

The stock ecu only uses a narrow band so you can't really have a gauge for that.

Aftermarket management can use a wideband 0 to 5V input which wouldn't matter if It's the old or new sensor being used. I imagine the benefit of the new sensor is it is faster.and I've never heard anyone complain that their wideband is too slow (assuming the sensor is in good condition) . You don't t need the negatives quick response the new sensor gives you.

Edited by Ben C34
cobrAA Mentor

cobrAA

Posted
  • Author
Posted

Sorry I wasn't clear lol ! :( I meant, for Aftermarket ECU, like a haltech, motec or any other ecu actually that use a wideband not the stock narrowband.

I was interesting in upgrading to this new sensor to have a better tune but it appears the lsu4.9 is not compatible with the lsu4.2 so i cant swap this new sensor with my actual wideband on my haltech unit.

Correct me if I'm wrong, but I don't see the use of using this new gauge/sensor since my ECU will read the 4.2 sensor. I rather see what my ECU see rather than my ECU read something and I see something ''more accurate'' with the new PLX.

Does that make anymore sens ? lol

GTSBoy Grand Master

GTSBoy

Posted
Posted

Does that make anymore sens ? lol

Not really. You can't really run closed loop off a wideband under load anyway. The O2 sensor is just not fast enough to work properly. Ergo, all you end up doing is running a closed loop target for cruise loads that is something other than 14.7:1, and I'm sure that a slight extra improvment in "accuracy" from one sensor to another is hardly worth getting in a froth over.

Now, I know that most wideband units can output a synthetic narrowband signal.....so if perhaps (and I haven't looked) your proposed new thingo can output a synthetic 0-5v wideband that you could pipe to your ECU, you could both have your cake and eat it too. New sensor and controller, equivalent of old sensor piped to ECU.

Sarumatix Veteran

Sarumatix

Posted
Posted (edited)

So you want to know if a Haltech ECU (such as ps2000) can run a Bosch LSU4.9 such as this: http://www.ebay.com.au/itm/Genuine-Bosch-wide-band-lambda-oxygen-sensor-0-258-017-025-LSU-4-9-WIDEBAND-/140893587376?pt=AU_Car_Parts_Accessories&hash=item20cde987b0&_uhb=1 ?

Good question :). I have sent it directly to Haltech to find out.

Edited by Sarumatix
Sarumatix Veteran

Sarumatix

Posted
Posted (edited)

LSU4.9 has been around for awhile and used to cost a lot more. It seems that they are actually cheaper now on ebay than 4.2s and that bosch wants to push customers to 4.9s, just about all modern vehicles are using 4.9s in OEM configuration. 4.9s are basically more durable, faster responding, and more accurate.

Edited by Sarumatix
Sarumatix Veteran

Sarumatix

Posted
Posted

Got a response from haltech.

The Haltech wideband controller uses the LSU4.2 sensor. You could use a different brand controller which uses a later LSU4.9 sensor, then feed the 0-5v signal from the controller into a spare Haltech AVI channel.

So... no :). I have also read further information that it suggests a 4.9 is totally amazeballs better and in some applications might be worse. *shrug*.

  • 6 months later...
scotty nm35 Grand Master

scotty nm35

Posted
Posted

I doubt it, unless you run a finned o2 sensor spacer.

I think the 4.9 may be less susceptible to carbon buildup in rich running petrol applications, but with e85 either is fine. Make sure any moisture can drain out of the little hole at the tip of the sensor or it will fail quickly, and mount it a few feet from the turbo with a new bung. (Usually near the gearbox crossmember)

32GTR use smaller O2 sensor threads anyway don't they?

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