Barometric sensor

Post Thu Jan 19, 2006 5:47 pm

Does my m40b18 (or any other e30 for that matter) have one?

I don't think it does but, I need a definitive answer if pos.

Some guys in an efi list are saying the the setup uses air volume, air temp AND barometric pressure.. But surely it's just the first two?

Damned americans!

Post Thu Jan 19, 2006 5:53 pm

No baro mate

they are talking shite

Post Thu Jan 19, 2006 5:55 pm

had that feeling cheers.

Post Thu Jan 19, 2006 7:07 pm

Got one on mine so cant be all bullshit!!

Post Thu Jan 19, 2006 7:08 pm

your car was marketed for italy and portugal; countries with very warm weather so probably would have them?

just a thought

Post Thu Jan 19, 2006 7:10 pm

Your car has an S14 fitted, that's why it has one.

Post Thu Jan 19, 2006 7:13 pm

Well he asked if any other E30's had one!!

Simon, have you replaced yours, phoned up BMW as I am driving to the Alps and wanted a new one just in case and they had never heard of it!! C3 also!!

So dont any other E30's have one except for the S14 engined ones?

Post Thu Jan 19, 2006 7:21 pm

Only the S14 engined cars I know of, not sure if other E30's for US market for example had them fitted.

I'm not suprised at the dealer not knowing nothing about them, but quite suprised C3 haven't.

Post Thu Jan 19, 2006 7:23 pm

318-is wrote:your car was marketed for italy and portugal; countries with very warm weather so probably would have them?

just a thought

It's a sensor for different altitudes, and air pressure, and adjusts the fuelling.

Post Thu Jan 19, 2006 7:23 pm

So what setup does the s14 use for air metering?

Post Thu Jan 19, 2006 7:24 pm

Simon wrote:Only the S14 engined cars I know of, not sure if other E30's for US market for example had them fitted.

I'm not suprised at the dealer not knowing nothing about them, but quite suprised C3 haven't.

All cars have them.

The older M10/M30 engines have them too.

Modern cars (M40) have the sensor built into the ECU.

They retard/advance the timing depending on the height above sea level.

Andrew

Post Thu Jan 19, 2006 7:28 pm

No lookup tables for Baro correction on the maps though dude, perhaps its a hardware dongle and directly alters PWM or some jazz

I stand corrected if this is the case, in fact, I'm gonna rip an ECU down and find the fekker

Post Thu Jan 19, 2006 8:14 pm

interessssssssting!

Let me know the results! If I had my spare ECU to hand I'd pop off the cover to look myself!

Could be an important issue in the MAF project.

would it have the sensor encased in the ECU itself? It sounds unlikely??

Post Thu Jan 19, 2006 11:26 pm

Certainly need them on South African models:
Cape Town = sea level = 100% Oxygen
Johannesburg = 3500ft above sea level = 70% oxygen in the air
In fact the differences are greater than the meter can cope with and need to be maually retuned as well.
Portsmouth = sea level = 100% oxygen!!!

Post Thu Jan 19, 2006 11:39 pm

MONSPORT42 wrote:Certainly need them on South African models:
Cape Town = sea level = 100% Oxygen
Portsmouth = sea level = 100% oxygen!!!

Air is 78% Nitrogen, 21% Oxygen, 1% mixed of CO2, Argon, Farts, Ozone....loads of others..... !!!

Post Thu Jan 19, 2006 11:53 pm

Well spotted Kam. Not being a scientist myself but experienced driving in all these places I guess I was describing air density of all air components. Even the farts are thinner (I'm told)!

Post Fri Jan 20, 2006 8:40 pm

Demlotcrew wrote:
They retard/advance the timing depending on the height above sea level.

Andrew

I'd have thought it would be mainly the fueling thats changed due to the differant levels of O2 in the air so it would affect the AFR's ?

Post Sun Jan 22, 2006 11:33 am

so did we get an answer ?