Early Model swap VSS Signal

[pandaboo911]

OBD1 swapped s52 in an '84 318i. Need to provide 413 DME with VSS signal.

Have a few questions:

Is the VSS signal that goes to the ECU a direct signal from the diff sensor?

I am not running a stock e30 speedo, so I can only use the raw output from diff speed sensor.

My speedo is going haywire when I rev the engine.Is this interference? My speedo is hooked up to the stock sensor signal and ground wires, are these shielded?

Thx

[DesertBMW]

it must be processed speed signal from the e30 instrument panel. Won't work directly.

[pandaboo911]

Can anyone confirm this? I've heard from another source that obd1 uses an unmodified signal from the speed sensor

[DTFE30]

I got mine form the OBC harness. S50 would cut out at 6200 rpm until I provided vehicle speed to DME.

[jeejee]

Hello,

If you are unable to get the needed signal to the engine DME,

i might have the solution, I ran into simular problems when installing an e34 m5 engine in a non bmw body, the engine missed 40 wheel horsepower due to a missing speed signal , I have done a lot a research and had a couple speed signal duplicators made.
My latest m70 conversion didnt work properly without the signal either...
if you are interested send me an email (oldtimerfan at hot mail) and I can send you some pictures and info..
I'm not a company or trying to make money, just trying to get some money back for having several made and in the process helping some enthusiasts :-)

Jeejee

[pandaboo911]

Thx for the reply JeeJee, I sent you an email.