Can anyone educate me on the correlation between ACC PUMP LO and ACC PUMP HI and what changes when the values are changed?

Thanks,
Dave B
EM-2 E/MSD w/3 bar MAP

....Also, can someone tell me the factory settings?

Both adds fuel to your base value @ the specific rpm,
The low / high settings switched over at 1875 rpm!

On systems with 3 bar map factory settings are:

ACC PUMP LO: 20
ACC Pump High: 10
Sence: 5

I use 40 (low) 20 (high) and Sence 4 on my 1,8T Volkswagen engine!

PS Download the actual manual here, a lot off tec. Infos inside!

EM4: http://www.sdsefi.com/em4main14.pdf
EM2: http://www.sdsefi.com/em2def.htm

Ralf
www.mft-berlin.de

The ACC pump is to tune your throttle response. When the throttle is intitially pressed, It takes time for the MAP to change and the computer to change the injector pulse. So by sensing throttle position, the computer adds fuel to your RPM map when it sees the throttle position go up.

Thanks for the responses. They help a lot.
Dave