Is O2 sensor needed with Alpha N

Its very cheap to have one fitted, i would post this question on S14.net

I am sure you need one!

But thats a cool mod your doing there! I hope to be doing the same shortly.

Andrew

very nice mod, i'm gathering information to do the same.

Where have you purchased you C/F Airbox and Alpha N from?

I too have taken the cats from my car, so i'm very interested in what info you find.

Bought it from

www.e30shop.de

Excellent service and very quick delivery, would recommend them any day.

I am in the process of asking this on s14.net so we shall see!

According the manual you can do it but everyone i speak to say they use the 02 to tune it, getting confused!!!!

First you need to be aware of the difference between NARROW band Lambda probe (fitted from factory to run your cat's) and WIDE band Lambda probe (needed to tune you Alpha-N properly).

The narrow band probe is only able to measure around Lambda 1 (AFR 14.7:1) which is fine to keep your mixture correct for the cats.

To tune ANY engine management properly you need to have a WIDE band Lambda unit whic is able to measure from very rich to very lean.

As 215DMX has already said, it's up to you if you go somewhere and get it tuned in OR if you want to keep an eye on how things are and do some tuning/adjusting yourself.

If you ask me I would strongly recommend to get your own Wideband Lambda system regardless if you or someone else is tuning it.

Alpha-N doesn't know when your engine start's wearing and will alway use the values given in the tables.
If the condition of your engine changes you will need to adjust accordingly. Without WBO2 it's a shot in the dark.

Adrian M3 90 wrote: Which size trumpets did you go for 15 or 17? Do S14.de supply the O2 sensor? I would have thought the sensor would come with the kit? How much was the kit after the currency change?

Why should the sensor come with the kit??? It's either supplied with the car (narrowband) or standalone (wideband).

So, if i brought a kit say from S14, like there optoin 1 or 2 kit what else do i need for my 1990 M3 to get it running and rolling road tuned?

Uwe, i used to live 20 mins away from you and would have asked you for help but i'm living up North now.

After reading some info and reading what was on the forum, i was getting worried that i needed more than the option 1  or 2 kit from s14 etc.

So i am right then in thinking all i needed was the Alphan -N - Kit and the C/F Airbox and when fitted off to get it tuned on a rolling road.

When iv'e fitted it will it ok to be running it with it's base program? Infact does it come with a base program?

Uwe is there some good info to read up on before doing this mod. I have
no experiance in tuning of motors, but I am very technically minded and
will be getting myself the wideband lambda and a laptop to use, aswell as
the Alpha-n.

One thing that pops into my mind at the moment is, I have read about
people that have worried about fuel pressure saying that their injectors
are running at 90-100% while at full rpm's and have gone with a higher
pressure fuel pump, as the 320is only has the intank fuel pump what
options would their be to these problems?

Any links would be helpful.

Luke

Italian M3 wrote: Uwe is there some good info to read up on before doing this mod. I have no experiance in tuning of motors, but I am very technically minded and will be getting myself the wideband lambda and a laptop to use, aswell as the Alpha-n. One thing that pops into my mind at the moment is, I have read about people that have worried about fuel pressure saying that their injectors are running at 90-100% while at full rpm's and have gone with a higher pressure fuel pump, as the 320is only has the intank fuel pump what options would their be to these problems? Any links would be helpful. Luke

you won't need a different fuel pump. You need an different FPR = fuel pressure regulator. Little round thing which is located at the end of your fuel rail (actually at the front of the engine :-)
215DMX has a comprehensive list of different FPR's from BOSCH

Uwe, all i have fitted is the stock item, i have a 1990 M3 but i have removed the cats but left the stock Lambda fitted near the down pipe.

I don't really know that much about AFR's and mixture set up , thats why i was going to get it on rolling road. But i do come from an electrical enginneering back ground so used to programing etc.

Is there any info on setting it up or do people keep so its a dark art?