Is O2 sensor needed with Alpha N

it's not really a dark art. You just need to know how an engine works. It's not just playing a little bit with the software and setting AFR's to a desired value.
You NEED some knowledge how an engine behaves and most certanly you need to understand what happens when you change "this and that".
If you have never fiddled around with a carb and spark plug colours, I would recommend to get it done from a professional. You can easily blow you engine in one afternoon if you ignore the "messages" from you engine, wbo2 kit.
There is a lot of reading on S14.net if you search for Alpha-N or MAXX.

I am willing to show how mine is set up if we can agree on a location and date.

The lambda control works in some sort of "window" cycling up and down. So even if your value on the map isn't spot on, the Lambda is able to pull it to AFR14.7 as long the map value is in this window. As soon you hit the pedal to the metal, the Lambda control is OFF.
There is a switch point in your throttle switch. If you connect a multimeter to the Throttle switch you can measure it (approx 80% throttle). Only the idle contact makes a "click".
The narrowband sensor is actually NOT able to precisely measure 14.7 AFR. The ECU does richen up till the sensor reads out of the Lambda 1, than immediately leans out till the sensor reads out of Lambda 1.
This cyling up and down is than somewhere around Lambda 1 (very simple explained, hope it makes sense).
In fact your car will run a little leaner on part throttle (depending on how it's mapped), than with Lambda control in place.

What are you trying to achive Roops? I have a narrowband gauge fitted (very cheap kit, about a tenner) which is good enough to give you an idea what is happening if your map is out on part throttle.
At least it shows you that your "trouble" area is lean or rich.

It Sounds like this is what you need:

Innovate Motorsports XD-1 WideBand Lambda  Gauge Kit is probably the best  on the market at the moment
Here is more info on this product:
http://www.tuneyourengine.com

This kit enables precise measurement of exhaust air/fuel ratio (AFR). The meter’s digital signal processing technology provides data on exactly how rich or lean an engine is running at any load. You can display output on the gauge and also feed third-party Engine Management system or Laptop etc.

Let me know if you are interested as I can get a significant discount on this product.
Hope this helps!
Vano

UweM3 wrote: The lambda control works in some sort of "window" cycling up and down. So even if your value on the map isn't spot on, the Lambda is able to pull it to AFR14.7 as long the map value is in this window. As soon you hit the pedal to the metal, the Lambda control is OFF. There is a switch point in your throttle switch. If you connect a multimeter to the Throttle switch you can measure it (approx 80% throttle). Only the idle contact makes a "click". The narrowband sensor is actually NOT able to precisely measure 14.7 AFR. The ECU does richen up till the sensor reads out of the Lambda 1, than immediately leans out till the sensor reads out of Lambda 1. This cyling up and down is than somewhere around Lambda 1 (very simple explained, hope it makes sense). In fact your car will run a little leaner on part throttle (depending on how it's mapped), than with Lambda control in place. What are you trying to achive Roops? I have a narrowband gauge fitted (very cheap kit, about a tenner) which is good enough to give you an idea what is happening if your map is out on part throttle. At least it shows you that your "trouble" area is lean or rich.

Perfect Uwe. I am sure my car is running rich pretty much through the rev range. It's got that kind of fluffly throttle response from idle when it stutters and then goes, whereas if you bring the throttle in smoothly it's fine. I am just trying to figure where to start looking, I haven't even pulled the plugs yet, which I should do and I am suspecting that the temp sensor may be worth changing. I just want to understand what controls the mixture thereby trying to make sensible decisions on the best course of action. I could just give it to somebody, but I wan't to have a fiddle myself.

Roops

Discounted price for XD-1 Kit is £259.00 Including VAT. Next Day UK Delivery is £9.00.
As a comparison Graham Goode Racing sell these for £312.55 + Delivery ( http://www.grahamgoode.com/general/products.php?partno=INN37 66).
Let me know which color combination you prefer:

Feel free contact me if you have any questions.
Thanks,
Vano
Tel: 07970015736

Yes, This is what's in the box:

• LC-1 Wideband Controller
• XD-1 Programmabe Digital Gauge
• Bosch LSU 4.2 Wideband 02 Sensor 5-wire
• Bung/Plug Kit
• LogWorks Software CD
• Owners Manual

Thanks!

Hi there Vano, mine is up and running, though I had
a little trouble in syncing it with the Motec due to a
ground difference, I will have a comparison check
soon to double check I'm seeing a true value. I think
it is slightly biased. i.e it is showing a Lambda
leaner than the engine is actually running, not y
much though.

Uwe, I believe the STD Lambda sensor (afm fitted
etc) also cuts outs out above 4000 rpm as well as
above 80% throttle.

Dave

Hi Dave,
Nice to hear from you again! :-)
Did you do "Free Air" calibration of the sensor? This should make it spot on.
Cheers,
Vano

Sooty edges are caused by crusing along. Not enough heat
0.98 - 1.00 is still "rich" (sort off). You need to run 15 and slightly above to "clean" your exhaust.
Or put your foot down. This will clean your plugs. For sure

Hi Chacha i will be needing one of these soon, will this offer still be around?

Thanks

Andrew