Does anyone know which wire of the MAP sensor gives the actual signal to the ECU on a Cosworth 4x4? I'm thinking it will probably be the brown/green wire on pin 11 of the ECU, but I'm not sure.

And can someone also tell me which wire carries the tacho signal at the ECU? The car has the MSD wasted spark conversion installed.

 

dont know if this will help

 

Thanks! That would mean that it's pin 15 on the ECU, with the black/red wire. Can anyone confirm this is the right wire?

 

Yes definatley Pin 15:

Rich

 

Can someone also tell me what the calibration is of the 3 bar MAP sensor? Is it -1 bar = 0 Volt, 2 bar = 5 Volt and linear in between?

 

For the 3 bar sensor, the minimum output of 0.25V is produced at 17KPA, max output of 4.75V is produced at 308KPA, so the LINEAR rate is 15.46V/KPA.
Hope this helps.
tabetha

 

Thanks!

But if the range is from 17 to 308 kPa and 0.25V to 4.75V, the linear range would be (308-17)/(4.75-4.25) = 64.67 kPa/V

I don't know where you got your linear value from?

Edited: Ah, I see. Your linear rate should be 0.01546 V/kPa.

 

Sorry was tired, I left out the "m" before the V.
tabetha

 

Hi,
This can help you.
Claude.

 

Thanks, I already found that spec sheet earlier today.