View attachment MW FUEL PUMP ADJUSTMENT.pdfI installed my pyrometer and boost gauges, but I've only had time to make the rack adjustment shown on Low buck diesel power website... the actual fuel adjustment is proving to be a real pain; the screws have proved very difficult to get out on the back of the pump that hold on the tin cover.
As it was explained to me; making the adjustment shown on Low Buck, you essentially are making the rack go to full throttle when you stomp the pedal instead of getting there in a regulated manner, so you'll only have that extra fuel for power under that condition (stomping on the pedal from 0-100% very quickly). I made this adjustment and it works as described; It's kind of a half-ass way of doing it IMO, but it does work, it's just a little odd.
Remember that hill I was talking about in my previous post... Cleared the top at 52mph, so it definitely made a difference.
I now have a good idea of the full potential.
She certainly Rolls some Coal when you stomp on it, but the "no air" adjustment screw should help with that.
Stock Max Boost: 23.4 psi / Max Boost achievable with Low Buck Adjustment: 32 psi
Stock Max EGT Post Turbo: 800F / Max post turbo EGT achievable with Low Buck Adjustment: 1,000F
My local Cummins shop said Max sustained EGT post turbo should be 1,000F Max assuming a 200-300F drop from pre turbo temp; I'm sticking with the lower temp of 900F Max sustained for now. They also said max boost for that engine stock should be about 24psi, and advised not to go over 30psi continuous.
I'm far from an expert on diesel engines, so feel free to correct/add to the information I'm posting on this; I'm only going off of what I've been told by people that work on these engine & pumps and that I assume are knowledgeable; Even the "experts" have differing opinions...
BTW: No offence intended to Low Buck's method or info whatsoever, I'm just sharing my experience with that particular adjustment shown assuming I understood it correctly.
I've added the instructions I made up from talking with the pump people, let me know if this looks accurate.