s50 conversion probs

[yetti24]

i have put this in my conversion thread , but thought i would start another post to see if anyone can help ,

can runs and drives nicely it is an e30 m3 with s50 b30 engine and evo 6 speed box ( which is on its last legs ) anyway when driving the car (only under acceleration , even the smallest bit) one of the ecus clicks ( like an indicator when a buls is out ) not sure if its vanos or the other ,
also my rev counter bounces back to 0 rpm and all over the place when the revs get in the high range (not all the time tends to be when accelerating full throttle into the high rev range )
anyone come accross either of these problems ? any help is very welcome

[jmc330i]

also my rev counter bounces back to 0 rpm and all over the place when the revs get in the high range (not all the time tends to be when accelerating full throttle into the high rev range )

Might be a stupid question, but did you change the coding plug for a 6 cylinder plug?

[UweM3]

I thought that the 325i coding plug doesn't work with the S50? I am awaiting a small module to solder in the M3's rev counter which will convert the signal to the right spec. 50 euros that was.

[jaistanley]

I'm pretty sure the standard E30 clocks work perfectly well with the S50 ECU's when they have a 6 pot coding plug. The M3 clocks you have will also move by the same amount, but as they have a different scale (8k rpm vs 7k rpm) require a signal re-sampler to read correctly.

My clocks still have the 4 pot coding plug and do the same thing as yetti describes. A 6 pot coding plug will fix the jumping around.

I'm looking for a set of M3 red needles and an 8K tacho fascia to fit to my own car. I dont want to get M3 clocks as I want to keep the fuel economy swingometer and get a re-sampler for the ECU injector pulse signal so my clocks and OBC see the same signal they expect from a set of 325i injectors (I will also need to get a re-sampler for the rpms in that case). This way my swingometer and computer will give the correct fuel economy readings and my VDO guages will look after the oil temperature, pressure and voltage.

HTH

I have no idea what the ecu relay clicking problem is.

Jai

[yetti24]

hi this sounds stupid i did change the white coding plug for a 325i one , but then changed it back again because the rev counter would go past 8000 rpm , i will change it again , ( i can handle it going past 8k but the not the bouncing around ) i will the post the out come , thanks neil

[jmc330i]

The S50 does work fine with the standard E30 clocks and 6 cyl coding plug, but to get the M3 clocks reading right (upto 8K) the signal needs altering. I think this is whats needed - www.dakotadigital.com

[yetti24]

hi thanks for the link i will have a look

[Theo]

To get the 0-8k M3 tacho working spot on with the 6cyl engine you can fit a coding chip from an E28 M5. The actualy plastic plug part doesn't fit, but open this up and you can fit the component into your cluster in place of the original E30 coding plug.

[glenn]

To get the 0-8k M3 tacho working spot on with the 6cyl engine you can fit a coding chip from an E28 M5. The actualy plastic plug part doesn't fit, but open this up and you can fit the component into your cluster in place of the original E30 coding plug.

thats intresting theo, you learn something new everyday

[yetti24]

thats a very interesting useful bit of information theo , dont suppose you know the part number for the e28 m5 code plug do you ?
just to update , i put the 6 cylinder code plug back in , in place of the 4 cylinder m3 plug , its actually worse in my opinion with the 325i 6 cylinder plug , the rev counter goes further past 8000 rpm and it still bounces back all over the place , whether its an issue with my cluster or not , anyone else had thgis problem ?

[ian332isport]

When I did my conversion, I also fitted an E30 M3 tacho (for the 8K rev range). I ran with the 6 cylinder coding plug, and all worked fine. It did however read approx 12% higher than it should.

I fitted the calibration module from Dakota Digital and dialed it in without any problems. Been fine for years.

Ian.

[Theo]

thats a very interesting useful bit of information theo , dont suppose you know the part number for the e28 m5 code plug do you ?
just to update , i put the 6 cylinder code plug back in , in place of the 4 cylinder m3 plug , its actually worse in my opinion with the 325i 6 cylinder plug , the rev counter goes further past 8000 rpm and it still bounces back all over the place , whether its an issue with my cluster or not , anyone else had thgis problem ?

The part number is 1377657 - I think the part was £20-£25.

[yetti24]

excellent i will give that a try thanks

[UweM3]

Theo, thanks a lot for sharing. Shame I have already paid 50euro for a conversion modul

[yetti24]

just to update on this the e28 m5 coding plug works fine and the rev counter seems to give the correct reading