vanos on E30 swap

[bmw13fr]

hello,

i have heard that the vanos doesn't work well on a E30
because the speed info isn't compatible with the S50B30 ECU
so we must make a speed info signal converter.

someone knows, how to make this converter ?

thank you

[jmc330i]

Ive heard no problems with the Vanos working in S50 conversions etc.

The only thing I know of that you need a converter for, is the signal for the rev counter.

[bmw13fr]

ok,
here that I found on a website (http://www.kempower.be)

The speed signal input of the original BMW E36 M3 and E34 M5 ECU comes from the original DASH unit, that has converted the speed signal coming from the rear axle sensor.

If we left the original DASH unit out, the ECU misses the speed signal and goes in SECURITY

APPLICATIONS

For racing we prefer another DASH unit

When we have transplanted a E36 M3 3.0 / 3.2 or E34 M5 3.6 / 3.8 engine in another BMW body

We have the solutions :

SPEED SIGNAL ADAPTOR WITH ORIGINAL REAR AXLE SENSOR

order # E0142-BM-09014101 price 150,00 € ex VAT

to be used on the E30 models using E30 speed sensor of rear axle with M3 E36 and M5 E34 engine without the need to use E36 or E34 speedometer, keeping E30 speedometer in function .

also can be used on all E36 models without the use of original Tacho instrument cluster (for example race application)

for all S50B30 - S52B32 - S38B36 - S38B38 engines/ECU's

also other engine transplants in E30 (see list below)

possibility to use this unit without original speedometer, but with rear axle sensor. THIS HAS TO BE SPECIFIED WHEN ORDERED

[jmc330i]

Will have to wait for Ian332isport to see this - he knows about the S50 things.

AFAIK, no one on here with M50/M52 or S50 conversions has anything like that.

[Gunni]

there is infact a speed output on the e30 dashboard, I used that one time ,
when it wasnԚ´t connected sometimes it would stop at 7k instead of 7200rpm,

[ian332isport]

As Gunni said above, just use the speed signal from the E30 instrument cluster and it will work fine. This signal is already running through the C101 connector on facelift cars.

You must have the speed signal connected, or the ECU will introduce a secondary rev limiter at 7K RPM which effectively limits the speed. It has nothing to do with the Vanos though.

Ian.

[bmw13fr]

some people said that the speed signal which comes from E30 rear diff isn't compatible with the S50B30 ECU.

so in France, some guys run with an E36 dashboard (or with Kempower unit) in their car

[ian332isport]

some people said that the speed signal which comes from E30 rear diff isn't compatible with the S50B30 ECU.

so in France, some guys run with an E36 dashboard (or with Kempower unit) in their car

The raw speed signal from the diff is not the correct signal. This signal is fed into the instrument cluster electronics and processed into a signal that is compatible with the S50 ECU.

I'm running the standard E30 dashboard and have the speeds signal connected to the S50B32 ECU and it works fine. It even speed limits at around 155 mph, so the signal is similar to the one coming from the E36 instruments.

If you have a race car that is not running the E30 or E36 dashboard, you would need the Kempower unit, but not if you keep the original dash.

Ian.

[Turbo-Brown]

It even speed limits at around 155 mph

[ian332isport]

It even speed limits at around 155 mph

At Bruntingthorpe

[Turbo-Brown]

[jmc330i]

Cheers for that Ian and Gunni

So its nothing I need worry about on mine then? Ive got it all wired up as per your wiring chart Ian.

It even speed limits at around 155 mph

[bmw13fr]

the C101 connectors is present on all E30 ?
or only on last E30 ('91) ?

ian => which years is your E30 ?

[Brianmoooore]

C101 connector is the big round plug and socket on the engine bulkhead just inboard of the fusebox, and is on all facelift E30s. Speed signal is on pin 14 (black/white wire) .

[ian332isport]

C101 connector is the big round plug and socket on the engine bulkhead just inboard of the fusebox, and is on all facelift E30s. Speed signal is on pin 14 (black/white wire) .

I thought early cars also had a C101 connector, but it has less running through it (road speed being one that's not present).

ian => which years is your E30 ?

Mine is a 91

For the record, facelift cars are 88 onwards. 87 cars are pre facelift.

Ian.

[Brianmoooore]

I thought early cars also had a C101 connector, but it has less running through it (road speed being one that's not present).
Ian.

Yes, that didn't come out quite as I meant it. I mean with all the signals present to interface directly with the S50/M50 engine looms.

[bmw13fr]

sorry, i wanted to speak about speed signal connector instead of C101 connector !
on some cars, it isn't present.

but on '91 E30, it is present !

so i think, if this connector (speed signal) isn't present you must buy an unit (as kempower sell)
if not the engine will run in default mode (240hp instead of 286hp)

somebody has already swap on an old E30 ?

thxxx ;)

[ian332isport]

sorry, i wanted to speak about speed signal connector instead of C101 connector !
on some cars, it isn't present.

but on '91 E30, it is present !

so i think, if this connector (speed signal) isn't present you must buy an unit (as kempower sell)
if not the engine will run in default mode (240hp instead of 286hp)

somebody has already swap on an old E30 ?

thxxx ;)

On early cars, it's present on the back of the instruments, but not at the C101. On later cars it's present on the back of the instruments and the C101.

As far as I'm aware, it should be available (somewhere) on all E30's, so the Kempower unit is not required.

Cheers,

Ian.

[bmw13fr]

thank you very much !!!!

[SAE30]

As Gunni said above, just use the speed signal from the E30 instrument cluster and it will work fine. This signal is already running through the C101 connector on facelift cars.

You must have the speed signal connected, or the ECU will introduce a secondary rev limiter at 7K RPM which effectively limits the speed. It has nothing to do with the Vanos though.

Ian.

i have taken the speed signal from the cluster to the obc....br/rd wire, will it be fine if i just connect it directly to the dme pin 42?
i've got the the s50b30 wiring and bosch dme