Does any one know the best place to get a Bosch LSU 4.2 wideband sensor and a Heat-Sink Bung Extender?

 

I've found some on Ebay. But the sensor is in the States and the Heat-sink bung extender is in Greece.

 

GGR do the Innovate stuff, so no doubt could supply.

best to mount the sensor a bit behind the turbo so EGT's are cool enough for it without the adaptor.

 

Chip has a spare one in the door pocket of his Audi - Hope that helps!

 

It's funny how all the manufacturers who use LSU4 sensors don't need heatsink bungs?

 

My wideband is in the turbo elbow and 4" away from the turbo, is a heat sink not needed then?

I'll have to 'borrow' it next time i'm in his car.

 

Mine is further down the exhaust. I read that 18" from the turbo is the best place, so thats what I did!

It's not like EGT where it needs to be as close as possible.

 

Well spotted!



GGR gets my vote, spot on service.

 

Even 18" away they can easily see too much heat still on some applications.

The official rating on the sensor is only to about 500 degrees C or something like that IIRC!

 

If you're running ALS, then for sure, but Innovate suggest 18". In my opinion, it can be further down the exhaust with no real ill-effect. That is until you get close to the end of the exhaust where you might take air in which could affect the readings. Of course the further down the exhaust it is, the more joins and potential leakage points you have, so if you have to make sure those are good.

 

Isn't there lag the further down the exhaust you go?

Mine is where it is becuase I'm lazy. Its in the standard narrow band location emulating a narrow band to the ECU for close loop opperation.

 

Yes there is lag if its further back, but on full throttle its tiny as you are shifting such massive volumes of air.

I often use a tailpipe probe, and even then the lag is very minimal, but on idle you can get lean readings due to the wind blowing up the exhaust! (not an issue when flat out)
Plus leaks in the exhaust can draw in air and lean the reading too.

At least the errors result in your thinking its leaner than it is not vice versa though, so not the end of the world!

 

Mine is approx 18" too, just at the start of the first bend in the exhaust:



The narrow band one though Ive got just a few inches from the turbo to increase the heat as they work better that way.

 

I thought it was about 7-750 degC ?

 

Just noticed what you were replying to there Stevie, yes its 800C I meant to put not 500C, sorry about that!