Lambda

[tuscan_al]

Do we have an alt part for this? Need a replacement.

[Basil Brush]

They are modified Landrover items so are Speed 6 specific.

The standard LR ones a) don't give the correct readings apparently, and b) can't take the heat and fail very quickly, ie a couple of months. I found this out the hard way earlier this year when a local dealer fitted the wrong ones.

[quesnon]

Fitted two to my cerbera about 3 months ago .They were non tvr parts and car has never run as well ,it just passed the MOT with readings as good as any modern normal car. If mixture levels are correct exhaust temp should be similar to any other petrol engine.I think they were about £40 each and i will dig out the part numbers tomorrow.

[tuscan_al]

Thanks, I have been on ngk website. Got code for the ones for V8 and read thier guide on how they work. I don't think the lambda is going to be special in anyway, only the mounting thread maybe. They all work on a 1v scale and depending on temp the metal changes the voltage according to oxygen in it.

Thanks for advise and I will let u know how I get on with
the landrovef one from eBay I got for £7.50

[Basil Brush]

They are definitely modified. The body is dismantled and the sealant inside replaced with a hard rubber bung where the cables exit. I'm not sure what the readings issue is - it was just what the guys at Track v Road told me.

It's not just the internal exhaust temps, but the fact the engine bay gets so hot, the same reason the chassis coating and the bodywork can get melted. I've got two 3 month old knackered LR units in my boot as evidence...

[tuscan_al]

So how are the std Landrover ones able to last on the V8's? Also mine is the early 3 wire one, the later cars have 4 wires and a different plug, are these modified too, seems like a lot of trouble to go to over a fiddly compenent to start with? Shame as they are so much cheaper if we can find the right model.

[Basil Brush]

tuscan_al said:

So how are the std Landrover ones able to last on the V8's? Also mine is the early 3 wire one, the later cars have 4 wires and a different plug, are these modified too, seems like a lot of trouble to go to over a fiddly compenent to start with? Shame as they are so much cheaper if we can find the right model.

I'm guessing it's because they are not stuck in a very confined engine bay right next to a 350 bhp motor with no cool air flow over them. Mine are the early 3 wire (ie expensive) ones as well. No idea about the later 4 wire ones but given they are a fair bit cheaper, maybe not.

[dvs_dave]

Could you not just put some sort of heat protective thermal sleeve around a standard sensor to protect it?

[blitzracing]

The NTK Rover / Nissan probes have a reverse voltage to mixture response, i.e. the voltage goes up when the mixture is rich, and the voltage range is slightly wider (0- 1.2 volts) than the generic Lambda probes (0-.8 volts). Im suprised the Speed Six ECU (whatever type this is) whould need this type, unless there are some modifications to the output signal, but Ive not seen your set up, so just a warning shot.

[tuscan_al]

blitzracing said:

The NTK Rover / Nissan probes have a reverse voltage to mixture response, i.e. the voltage goes up when the mixture is rich, and the voltage range is slightly wider (0- 1.2 volts) than the generic Lambda probes (0-.8 volts). Im suprised the Speed Six ECU (whatever type this is) whould need this type, unless there are some modifications to the output signal, but Ive not seen your set up, so just a warning shot.

Hi,

Sound slike you know a little about this. The SP6 ECU is an MBE unit. Does this help? I'm going to pull out the old one tomorrow and go from there.

Alex

[blitzracing]

Difficult to find out what type unless you can measure the output voltages and then either make the engine over fuel or introduce an air leak to make it run lean and see which way the voltage goes. Its easy enough on the RV8 setup as you have a common plenum to you can take a bolt out to let in more air, but not so easy on throttle bodies. I guess a sharp blip of the throttle should be enough to richen for a moment.

[tuscan_al]

well today I removed the old one. It was a Sagem 73365B, using the NTK crossref page on the PDF from the web. This is an equivalent for the Std Rover V8 one and the ones I got off ebay. So I have put it in, going to reset the adaptives and and that in the morning, and see how they run. But I cannot see why it would have been a 'special' one for the early tuscans, esp as the ecu is the same as the Cerb's MBE.

Will let you know how I get on and then stick up the alt parts on mytuscan.

[Basil Brush]

Did the one you removed have the rivets that hold the outer casing ground off?

[tuscan_al]

Basil Brush said:

Did the one you removed have the rivets that hold the outer casing ground off?

hmm I didn't see any rivets, but the one removed does have a tack weld on the outer sleeve? Would this be something, damm I hope not, as it will mean going back in.