Wideband Lambda
Discussion
I am steering towards fuelling as my problem on the 400SX. Probably something to do with the pump or filters etc.
To help with diagnosis, and subsequent tuning up, I'm thinking it's time to get a wideband lambda sensor with a display. The one I am eyeing on the flea is £150 and comes with data logging to a PC. So I can see the instantaneous plus log stuff as I drive.
Any experiences with these? Recommendations?
The spartan one is very cheap but has no data logging capability (which I would prefer).
I do have a US branch office I can ship stuff through if necessary.
However the tech-edge one is £134 ex vat and the equivalent 14.7 one is £115 at US prices, so not that much difference.
I do have a US branch office I can ship stuff through if necessary.
However the tech-edge one is £134 ex vat and the equivalent 14.7 one is £115 at US prices, so not that much difference.
Edited by adam quantrill on Thursday 3rd April 19:58
The AEM has a bit of data logging but I would have to log my TPS and AFM separately though some A-D convertors. But it comes with a display (anyone got pictures of the display running?)
The tech-edge has two pulse and two analogue extra inputs so hopefully I can log rpm too against AFR and the inputs. But no display. And slightly cheaper (which pays for me to make a display).
The tech-edge has two pulse and two analogue extra inputs so hopefully I can log rpm too against AFR and the inputs. But no display. And slightly cheaper (which pays for me to make a display).
Even the wideband ones are only £30. THe rest of the cost is in the electronics and even though I suppose I could make my own, it's a matter of all the calibration etc that's gone into it.
In the long run I expect I will replace the innards of the 4CU with something, and that of course will have wireless so I can see the log on my 'phone, which has oodles of memory anyway.
In the long run I expect I will replace the innards of the 4CU with something, and that of course will have wireless so I can see the log on my 'phone, which has oodles of memory anyway.
OK on triggerwheels:
2J2 with no sensor
(- inc VAT £30.00,
ex VAT £25.00)
So not on its own but the difference with or without.
The whole field seems to be beset with ripoffs - just been looking for M18x1.5 thread stuff (to install an extra bung and port) and you can pay up to a tenner for a bung! Seems the cheapest M18x1.5 bosses are actually 1" long tubes for use with rose joints - cut one in half to make 2 ;^)
2J2 with no sensor
(- inc VAT £30.00,
ex VAT £25.00)
So not on its own but the difference with or without.
The whole field seems to be beset with ripoffs - just been looking for M18x1.5 thread stuff (to install an extra bung and port) and you can pay up to a tenner for a bung! Seems the cheapest M18x1.5 bosses are actually 1" long tubes for use with rose joints - cut one in half to make 2 ;^)
Edited by adam quantrill on Friday 4th April 19:52
Yeah I was just reading the manual...
"7.3 Measuring at the tail-pipe
On non-catalytic converter equipped vehicles it is possible to measure the air-fuel-ratio at the tailpipe.
It is highly recommended to use the optional LM-1 Exhaust Clamp. Without it too much
outside air may enter the exhaust, especially at idle, to prevent correct measurements and
leading to a lean measurement. Sticking the sensor itself into the exhaust pipe can yield
inconsistent results because the sensor will not have outside air available as a reference gas."
So... if I can mount it in the tailpipe... it looks like I can mount it anywhere I like in the exhaust system. If I mount it at the front of the centre box after the Y join then I'll get both banks averaged.
As the bungs are only £2.50 I can afford to put a few in at different positions.
I just spotted this: "Move your sensor bung as far
downstream as possible. Right before the cat, or 2-3 feet from
the end of the tailpipe are good locations."
So - I could put it after the main box if I liked...
"7.3 Measuring at the tail-pipe
On non-catalytic converter equipped vehicles it is possible to measure the air-fuel-ratio at the tailpipe.
It is highly recommended to use the optional LM-1 Exhaust Clamp. Without it too much
outside air may enter the exhaust, especially at idle, to prevent correct measurements and
leading to a lean measurement. Sticking the sensor itself into the exhaust pipe can yield
inconsistent results because the sensor will not have outside air available as a reference gas."
So... if I can mount it in the tailpipe... it looks like I can mount it anywhere I like in the exhaust system. If I mount it at the front of the centre box after the Y join then I'll get both banks averaged.
As the bungs are only £2.50 I can afford to put a few in at different positions.
I just spotted this: "Move your sensor bung as far
downstream as possible. Right before the cat, or 2-3 feet from
the end of the tailpipe are good locations."
So - I could put it after the main box if I liked...
Edited by adam quantrill on Wednesday 30th July 21:40
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