Hi,

Here's what I've done to my car and it may answer some of your questions:

7.5mm pump elements, sourced from Germany, custom made by a member here "Tomnik".

I installed the elements myself and calibrated the pump using a machine I designed and built. It runs pretty well with everything else stock right now but I'm making improvements to the calibration machine to prefect the adjustments and get it running even smoother.

The plan is to go for 400HP and install a different exhaust and induction system. In my opinion, a "tune" is not necessary if you have larger pump elements. You need to modify the rack feedback circuit to fool the ECU into pushing more fuel.

This car has a semi-mechanical pump. The front side is virtually identical to the full mechanical unit but it has a wire coil controlled by PCM from the ECU to drive fuel output. My car runs clean (a little smoke at full throttle, idle is clean as stock) and throws no codes.

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250