Kevo1288
Full Access Member
Hmm that really sucks. As I just went through installing one. Maybe I'll just leave the truck at intake and exhaust for now.
I’ve seen it done on the old American Bosch pumps, but with the db2s I will usually stretch the spring a half inch to an inch over its original length for a modest increase in rpms, or put in the 6.2 spring in for 4500 rpm defuel.Related question:
Anyone know much about shimming the governor spring? I've heard that it's a viable option for higher RPM defuel vs using a 6.2/6.5 spring. What I need to know is what's the ID, OD and thickness of the shim supposed to be. I'll see if I can just make one at work and try it out.
I did most of these steps and I can say I am very pleased. So far in the tuning, I have punched out the pressure relieve valve, backed out the torque screw all the way, and bottomed out the "minimax" and boy did it wake the motor up! I do have Stage 1 injectors so my throttle response is much better/more sensitive. And my stage 1 drop in turbo spools sooner/quicker. I think my rpms are higher now as I can get a little more mph out of each gear on my zf5 but my rpm gauge is not accurate, prolly just need a new tach sensor. However, I have noticed timing is a little louder/chattier on the bottom half of the rpm curve while cruising, so I may have to back off the timing or adjust the cam plate. Also wanted to follow up on the electric fuel pump, I just have a facet 40222 with no regulator, seems to be doing just fine and no filter light yet, so no pressure vacuum pre IP.
The only thing I did not touch is the fuel screw and I know I have 2-3 flats left from max because I backed it off last time I adjusted it. I know the fuel screw greatly effects top end fueling and egt's. Right now I have my wastegate shut and hovers around 15-16psi and 800 egts going up hills so I got plently of egts to spare. I do not have headstuds, so I am comfortable staying at 15psi. I haven't decided if I will experiment the maxed out fuel screw and take it out for a test drive or wait until I get my ford 6.0 intercooler installed and hooked up, see what the pressure drop is and adjust/tune accordingly.
Thanks again for sharing the guide!
Related question:
Anyone know much about shimming the governor spring? I've heard that it's a viable option for higher RPM defuel vs using a 6.2/6.5 spring. What I need to know is what's the ID, OD and thickness of the shim supposed to be. I'll see if I can just make one at work and try it out.
I spoke with @snicklas about getting some of my manuals scanned in and uploaded, unfortunately it’s still a copyright issue. He said uploading a picture here and there to answer someone’s question is fine, but uploading full manuals would attract too much attentionSo I have and old international book with a whole chapter on pump tunning and calibration. Would anyone be interested in me posting them up? I don't know if we have a copy right issue here but...