DIY Si
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 posted on 10/12/08 at 05:33 PM |
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Lambda sensor for a V6
Evening all, just having a sit and a think about my next project. I'm planning on using a Go-Tech ecu to run the 24V 2.5 V6 from a alfa 156.
Now, for the lambda senors, the 156 has one in each manifold collector. Would this be needed to run the engine with the after market ECU, or could one
heated sensor be used further down the exhuast where the two banks will (probably) come together?
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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mr henderson
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| posted on 10/12/08 at 06:37 PM |
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I'll be interested in the answer to this one as well
It would seem that one signal would be enough, as long as there wasn't any significant variation between each bank, but maybe that isn't
the case?
John
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clairetoo
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| posted on 10/12/08 at 07:28 PM |
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I'm running a single sensor on one side as my exhausts are completely separate - I just keep an eye on balance between the two banks of throttle
bodies , and I'm having no problems 
Its cuz I is blond , innit
Claire xx
Will weld for food......
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DIY Si
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| posted on 10/12/08 at 07:31 PM |
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Claire, if you had the choice though, which option would you go for? One for each bank seems as if it should be better, but is it worth the extra cost
and wiring?
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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piddy
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| posted on 10/12/08 at 07:46 PM |
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The sensor should be mounted as close to the head as possible, but reading all cyclinders. You would therefore be better to mount one sensor where the
three pipes join and check balance as clairetoo has done. Or fit two sensors if your ECU allows.
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britishtrident
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| posted on 10/12/08 at 07:51 PM |
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A primary Lambda sensor needs to be as close as possible to the exhaust valves.
Running one Lambda sensor on one bank a vee engine is better than putting it in a cooler part of the exhaust futher away from the cylinders.
As already mentioned just watch the throttle balance and other factors that could cause each bank of the Vee to experience different operating
conditions.
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clairetoo
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| posted on 10/12/08 at 07:53 PM |
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quote:
Originally posted by DIY Si
Claire, if you had the choice though, which option would you go for? One for each bank seems as if it should be better, but is it worth the extra cost
and wiring?
Two sensors would be the best way to go - but horribly expensive . It allso leaves you with a small problem - how to adjust the fueling on each side ,
independently ? My megasquirt wont do it......
Theres allso the question of `information overload` - you could easily end up with `data` that you cant do anything with 
Its cuz I is blond , innit
Claire xx
Will weld for food......
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Chippy
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| posted on 10/12/08 at 11:01 PM |
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I run my V6 Cossie with just one Lambda, on a twin pipe system, as the engine is batch fire the fueling "should" be the same on both
banks. The easiest way to check that this is the case is to get your local "friendly" MOT man to check both pipes for emissions. When I
first set mine up I did this and found one bank was running lean, (18.6 instead of 14.6), this was "eventualy" traced to a dry joint on
the adaptor board, now every thing is fine with 14.6 on both banks. HTH Ray
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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