S14 or S50?

S14 or S50?

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Discussion

stevesingo

4,848 posts

221 months

Tuesday 24th November 2015
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Why do you have a non-stock pressure regulator, were you running out of injector capacity? Most aftermarket FPRs are hopeless, so unless you need an adjustable regulator to give more injector head room, then replace with stock. If you do need an adjustable FPR, BMW Motorsport used a Bosch adjustable regulator. I have one with 1000miles use I can let you have for much less than you would pay BMW MS for one.

Check the vacuum line from the Idle valve to the FPR. If this is split you will have rich running at part throttle.

The inlet air sensor (IAT) could cause some richness, but only in extremis. I’m not sure what the ECU fail safe is for a faulty sensor, most default to 20degC if the sensor is faulty/not connected, if it is 20 degC then in the weather we have been having lately, you would be lean rather than rich.

There is a Baro sensor on the old air filter bracket on the LH inner wing. This corrects for altitude. You can try disconnecting this, but again this should not cause rich running as the ECU defaults to sea level when the sensor is not connected. Assuming you are not living on Ben Nevis of course.

What AFRs are you seeing and under what conditions?

e21Mark

Original Poster:

16,205 posts

172 months

Tuesday 24th November 2015
quotequote all
I'll try and find a printout and scan it later today but peak power was only 181.6 HP and was running a rich from around 5000 to 7000 with an AFR of around 10, rising to around 11 - 11.2 everywhere else. It was previously making 215 - 220 bhp.

Also, do you know how the Tech Edge LA1 AFR display are connected?

I'll take the FPR please. (Just fire across your details - thank you!) I didn't fit the adjustable one, it was on the car already.

stevesingo

4,848 posts

221 months

Tuesday 24th November 2015
quotequote all
I’m away from home at the moment, back on Thursday. Email you a picture.

Are you running the latest version of MAXX A/N controller? The latest version has self-mapping I believe.

I’m sorry, I know nothing of the Tech Edge WB02 units. Their website is hopeless. Which WB02 cotroller are you using?

e21Mark

Original Poster:

16,205 posts

172 months

Wednesday 25th November 2015
quotequote all
It's a Tech-Edge LA1 and it was working when I got my car but I had some old wiring removed, whilst the dash was out and being flocked, and it wasn't re connected. I'm struggling to find out if it has a control box or simply connects to a lambda?


stevesingo

4,848 posts

221 months

Thursday 26th November 2015
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The Tech Edge controller is a separated box, likely to be next to the A/N controller which is likely to be next to the ECU behind the upper glove box cover.

From what I can understand from the Tech Edge web site, the LC1 connects to the controller with a RJ45 Ethernet cable.

This is an example of one of Tech Edges controllers with a schematic of connectivity.

http://wbo2.com/2c0/2c0.htm

e21Mark

Original Poster:

16,205 posts

172 months

Saturday 28th November 2015
quotequote all
Well my s14 runs the usual carbon air box, Maxx Alpha N set up and although it appears to run OK and rev cleanly, it is just not making the power it did and is running far too rich. I have replaced the lambda, the coolant temp' sensor, barometric sensor & the air temp' sensor etc but on the dyno peak power was only 181.6 HP (flywheel) and it was running rich from around 5k revs to 7k revs, with an AFR of around 10, rising to 11 - 11.2 everywhere else. It had previously made 210 - 215HP. The chip and Alpha N map were both supplied by John on s14.power so am sure the problem lies elsewhere. I'm just struggling to find it.

A compression test showed 200 190 190 200 and the tappets were all at 1.4

Any suggestions guys?

After spending a few hours reading old threads, I am thinking there is most likely a fault in the sensor wiring?

If the engine is at idle and you unplug the air intake temp' sensor should it effect the running? There is a small change (hardly noticeable unless deliberately looking for it) but nothing more.

Are the connectors for the coolant temp' sensor likely to fail and give a false reading, that might cause over fuelling?

Would running a regular lambda, as opposed to the wide band version, cause any issues?