28 replies to this topic

[nicklouse]

Where would you put it in the Y piece or in the center branch pipe?

[MatthewsDad]

Maniflow put theirs in the Y piece. mine has been retrospectively installed just forward of the cat without any noticeable effect on readings.

[KTS]

I read somewhere that lambda sensor should be 18 inches or so from the exhaust port - I'll link the source if I can find it..

Edit - install details for one of the pro sport far kits

http://prosportgauge...JDMWIDEBAND.pdf

Edited by KTS, 07 April 2020 - 09:31 PM.

[cal844]

I'd put it in the Y piece so both branches are measured

[skoughi]

Put mine on the middle pipe just behind where the Y branch joins into it. Felt that was the only place that had enough from to get in pointing slightly downward and got a proper reading for all cylinders.

[Quinlan minor]

I read somewhere that lambda sensor should be 18 inches or so from the exhaust port - I'll link the source if I can find it..

Edit - install details for one of the pro sport far kits

http://prosportgauge...JDMWIDEBAND.pdf

Rover can’t have read that, since they fitted it in the cast manifold.

[sonscar]

Right can of worms.When I seeked advice on my MGB similarly siamese port I was advised you needed 2 or 3 to see the individual cylinders.I went for one in the centre cylinder of the cast manifold.Steve..

[KTS]

 

I read somewhere that lambda sensor should be 18 inches or so from the exhaust port - I'll link the source if I can find it..

Edit - install details for one of the pro sport far kits

http://prosportgauge...JDMWIDEBAND.pdf

Rover can’t have read that, since they fitted it in the cast manifold.

 

 

that was nearly 20 years ago

 

i assumed, rightly or wrongly, that if he's looking to add a lambda sensor to the car he might be considering something a little more modern.

 

there appear to be a number of different types of lambda sensor that could be used (narrow band,wide band, heated/non-heated) and each may have it's own set of requirements, so perhaps the starting point is to identify which type is going to be used before deciding where it should be installed 

[Ethel]

Mine's under the floor, the supplier (14point7) recommend about a metre from the valves.

 

I suppose you'd have to make an educated guess on whether innies or outies (cylinders) are more critical.

 

Outers are likely to have lower pressure because of the siamese ports. Inertia is also likely to throw them more liquid fuel from a single carb or injector. 

[Icey]

I would want it before the y-piece as they are such a pain to seal that I doubt you'd get an accurate reading. For tuning you could add two bungs (one in an outter, one in a inner runner) and then for day-to-day running just use the one that gives the best indication of overall running conditions.

[nicklouse]

So 18 inches. So innies or outies? The Y piece does not start till about 26/7 inches.

[Ethel]

That is a good point.

 

Though I'd opt for the leanest reading pair because  too rich won't melt your pistons so much. I reckon that'd be the inner two.

 

 

Years ago a more observant spanner monkey than me pointed out to me that A's have a habit of coming to a stop at the start of No2's power stroke. 

[KTS]

i thought the outers typically run leaner ?

 

below is a forced induction setup, but certainly shows a marked difference

 

http://www.theminifo...50#entry3605833

[unburntfuelinthemorning]

Mines just after the Y piece to get an average reading of all cylinders.  Only really needs to be closer for closed loop control to keep lambda at 1.0 as much as possible for maximum convertor efficiency. 

 

 

[nicklouse]

Unfortunately mine can’t  go there as there is a gear change housing in the way.

Edited by nicklouse, 09 April 2020 - 06:01 PM.