Technical Odd lambda location

[fingers99]

I'm cleaning up the accident damaged Supersprint manifold I got of RichCinq and noticed (it's a 4 into 2 into 1) that the Lambda is on the 2 section between 1 and 4, so it only picks up emissions for those 2 cylinders.

Now, I can see why they did it that way, but any ideas as to the likely consequences?

It'll be an interesting repair, involving cutting out some sections in order to get something inside to knock out the dents, and then welding up in the right order so that I can get the TIG to it. It's going on Blue 2 (1242) so will need extending and tweaking a touch (hopefully I can do this at the 2 into 1 connector) and I'll stick another lambda boss on for mapping.

Anyone any ideas about the material they used? There's a fair bit of surface rust on this one, which leads me to think it's a relatively low grade stainless (below 304, I'd have thought) -- certainly you couldn't get away with it for motorcycles.

 

[allanhelen]

I thought the same about the Lambda boss too at least it picks up one cylinder from each coil pack so should be ok for the fueling plus that is about as far as the std lambda cable will reach too.

saying that though I have a second boss fitted to mine as i thought it wasn't the best.

Strange you have rust, mine it is still pristine apart from the blueing of course

 

[randomizered]

I'm having a boss put in my decat section, near the steering column.

If you use EGO control on your ECU, it will still work fine, but you do see odd results.

As one cylinder exhaust, it has burnt fuel in it, but due to the firing order you will get normal air pushed through on another stoke.

Looking at the Lambda output, this makes it not so smooth, as the values fluctuate a bit.

I'd imagine moving it to where all 4 meet would make the reading more stable, as there would always be a level of burnt fuel in the readout.

That's what I'm gonna find out anyway, but I've been quoted £20 to have a bung fitted, so am looking around for cheaper.

Kristian

 

[fingers99]

£20 for a bung or a boss? For a boss 20 is OK. for a bung (basically it's just a bolt!) way too much. Remember that most/many aftermarket ECUs only use the second lambda for mapping, otherwise it's blocked off. Somewhere like Tweeks or one of the exhaust manufacturers should have them off the shelf.

 

[randomizered]

£20 to take in my decat section, have them drill a hole and weld on the bung i already own.

I can't see that being more than a few mins of work, and they are not providing parts, so seemed a bit pricey to me.

Kristian

 

[fordcosworth]

i also found it strange that the manifold hs the lambda on one side
so the ECU is a bit cluless as to whats hapeneing with the 2 cylinders not being watched by the lambda! i wasnt very impressed with that,also esp design's where i bought it from told me the manifold wasnt stainless,he told me it was simply plated, im not sure if that is true.

 

[Brooky]

So with all the above posts, When i come to installing me LC-1, i should put the probe after all the pipes have met?

 

[fordcosworth]

So with all the above posts, When i come to installing me LC-1, i should put the probe after all the pipes have met?

deffinatly it best that way

 

[randomizered]

So with all the above posts, When i come to installing me LC-1, i should put the probe after all the pipes have met?

You don't have to. I have been fine tuning and running where it is, technically its a bit better though, so is on my todo list. Not a pre-requesit though

 

[fingers99]

£20 to take in my decat section, have them drill a hole and weld on the bung i already own.

I can't see that being more than a few mins of work, and they are not providing parts, so seemed a bit pricey to me.

Kristian

I'd say it's about right. Cheap if it's TIGed, expensive if it's MIGed. Most welding shops will quote by the half hour for small jobs, so although yours will take between 5 and 20 minutes, you get done for 30.