brettj3876

You have a lot of knowledge I bet that S480 spools instantly with that 1.18 A/R. Timing set in the high 20s running those high rpms? I know a lot of pulling 12V are set in the mid 30s We just converted vmac1 to fully mechanical. The guy that built it builds hot rod 12v cummins for sled pulling. I don't exactly what he did to the pump i do know he put a quick rate cam in it and different p/b still 12mm. We're getting it dialed in now. We need to adjust the fuel plate it's only getting 35psi now and 40 with old pump before. Anxious to how it pulls. Timing set at 18 but egt came up quick so it needs a few more deg 20-21 will do. S475 1.32, stg2 injectors from rochester diesel

That seems about right with the blixxton. 33 is what we were pushing with one

Imo going full mechanical is the way to go. Everyone that has driven a full mech says they pull circles around the vmac 1-2. Your already setup for the manual throttle anyways. It's gonna be a royal pain to change everything over to fly by wire

Get rid of the econovance and mount a mechanical p7100 up to it and you'll have a nice mechanical E-7. Gonna need new fuel lines too since moving the pump location. We just did this to our 93. Set the timing around 17-18 deg to start but you'll probably like it right there The pic is upside down Lol but in my avatar that's the mechanical pump we had built. Working on getting the throttle and shut off cable working now. Probably be on the road again by next week You'll also need a diff style coupler on the end of the pump. I don't know the # off the top of my head but I'll get it. Bout 600$ from mack

They're happy in the 1300-1700 range

Not much you can do like you stated already have the blixxton. The throttle response is like that because of the EPA not wanting it to smoke too much down low. The blixxton I feel helps a lot imo. You should think about stg2 injectors and a diff turbo. That's what we did with the 93. We also bought the new blixxton for our 99 460 E-tech and that really woke it up. Still can't out pull the 93 tho. But with injectors and a turbo I bet it'll give it a run for its money then

15-40 Rotella. Change every 15k. Both trucks never use more than half a gallon between changes. Works good for us

The s475 turbo i suggested is 600-700 brand new from Borg Warner. But you do need bigger injectors to run it. Stage 2 or 3 from rochester would work good with that setup. Or call k&s and ask what injectors they would use for the setup On a 93 with stage 2 injectors i see 42psi with that turbo from 1400-1750ish before it starts to drop off

Instead of OEM injectors look up KS fuel or rochester diesel. Ks is cheaper than rochester. That's the way I'd go if wanting more horse. Leave maxi file in it. It produces a more usable power band than say a straight 460 file. If upgrading the turbo look at the yt467 or s475 BW Personally i like the big S475 1.32A/R. It's a tad laggy off the line (not too much) it pulls good down to 1300 and up top 1500-1750 rpm is where you see the advantages over the smaller turbo

Your temps are fine. We run a little bit bigger turbo (s475 1.32ar) and have the same temps as you. As long as we keep it above 1400 the pyro stays below 1000. 1650-1700 on a hard pull she's right around 900-950 and on flat ground around 700

I didn't realize e6 pump would mount up? When were swapping out the vmac1 for the mech pump were getting rid of the econovance all together. Takes some hp to turn that. Mount the pump and get new lines is all. As for the timing I'd stay around 17°. The guy that built our pump is very knowledgeable and he said right around there. Too far advance and you'll lose all the low rpm grunt. Better to be a tad retarded than too advanced. You can fool the computer on the vmac and mess with the timing. The TEM (timing event marker) drill that out and in large the 2 slots so you can have a tiny bit of play up and down. Forget which way is advance and retard. You can also take the tone wheel off and then rotate it just a cunt hair. To fool it that way it's the opposite of what you'd think.

Went from full mechanical injection with the Bosch P pump (p7100) to the semi electronic Vmac 1&2 with the electronic gov housing. Fly by wire. Timing controlled with econovance. Ran off of oil psi with a gear on a swedge basically to advance/retard timing as needed, to satisfy the EPA. Then came fully electronic Etech with unit pumps ran off the cam. Really it's apples to oranges comparison the old E-7 to the E-tech. The best engine mack ever made was the mechanical E-7 and vmac 1&2. The E tech doesn't even sound like a mack except a tiny bit at idle.

Fumble with the 1939 J our 93 was doing the exact same thing. Would randomly shut down but flip the key and it would start right back up

Throw a s475 on and hang the F on. You got enough fuel to spool it

Post turbo probe? I would keep try to keep it under 1050. Our says 1025 max and 99 says 1100 max. 1200 won't hurt it for short bursts but deff don't pull a couple mile grade like that