MFDES

Powerstroke1098 · Apr 21, 2015

What should Mass fuel at idle be? My truck idles very rough and I'm trying to narrow it down, my MF is .17-.21gr at idle.

mandkole · Apr 21, 2015

Check with your tuner..

Powerstroke1098 · Apr 21, 2015

They wont answer!

lariat 7.3 · Apr 21, 2015

seems as if i hear a lot of people complaining about gearheads CS these days... they've been great for me but i havent contacted them lately

Powerstroke1098 · Apr 21, 2015

Im not bashing, i've had nothing but good luck with their tuning and customer support!

The Brad · Apr 22, 2015

Mine idles at 9.5-10.1mg it goes up to 12.0 if I cancel a cylinder.

Powerstroke1098 · Apr 22, 2015

So if I convert mine it's between 11.01-13.60mg.

Powerstroke1098 · Apr 22, 2015

The Brad said:
Mine idles at 9.5-10.1mg it goes up to 12.0 if I cancel a cylinder.

What's your ICP and IPR %?

The Brad · Apr 22, 2015

490 +/- 5psi @ 9.7-10.1 according to AE. Torque shows 148mg/stroke but I think there's something wrong with the math there.

Dieselboy. · Apr 22, 2015

Did it just develop a rough idle ? Or it came that way.

Could also be too much ICP/pw.

I usually set up a 200% nozzle file with 450-470 ICP and 1.6-1.8 ms of pw. Bump idle to 700rpm and it's smooth as glass

Powerstroke1098 · Apr 22, 2015

Its been rough since I installed everything,

At an EOT of 80 degrees (cold)
870-900psi ICP
19.14-19.53% IPR DC
1.25-1.28ms PW
21-.22gr MFDES

At an EOT of 158 degrees (hot)
660-750psi ICP
15.40-17.18% IPR DC
1.22-1.34ms PW
.17-.22 MFDES

It seems like the biggest difference between hot and cold is that ICP and the IPR DC is higher and everything is much more stable and doesn't vary as much when cold. It jumps between 19.14-19.53% IPR DC when cold, it doesn't vary in between like every other parameter listed. RPM vary's between 608-699.

golfer · Apr 22, 2015

Powerstroke1098 said:
Its been rough since I installed everything,

At an EOT of 80 degrees (cold)
870-900psi ICP
19.14-19.53% IPR DC
1.25-1.28ms PW
21-.22gr MFDES

At an EOT of 158 degrees (hot)
660-750psi ICP
15.40-17.18% IPR DC
1.22-1.34ms PW
.17-.22 MFDES

It seems like the biggest difference between hot and cold is that ICP and the IPR DC is higher and everything is much more stable and doesn't vary as much when cold. It jumps between 19.14-19.53% IPR DC when cold, it doesn't vary in between like every other parameter listed. RPM vary's between 608-699.

you have a HydraChip?

Powerstroke1098 · Apr 22, 2015

No just a TS, I should really just buy one at this point.

Powerstroke1098 · Apr 22, 2015

Do you think I will be able to get it dialed in without a hydra? Or will I be sending it back and forth too much?

lariat 7.3 · Apr 22, 2015

Hydra they can email tunes

mandkole · Apr 22, 2015

Yeah, he was likely offering just to shoot you a file or two. Im getting real close to a hydra myself just to try ideas.

TyCorr · Apr 22, 2015

Holy ***k, you're alive! I was asking what happened to you the other day. Hope all is well!

Directed at dieseloy^

Gearhead · Apr 23, 2015

It sounds like MFD is high.. i like 6-12 at idle warm if i remember my notes... If you call in and get the machine that means that one of the two full time guys must be on a bathroom break or something. At times we have 4 people in the office, but it isn't all the time. If you leave a message you will get a call back.

On a manual truck with a 200% nozzle, getting the idle perfect has its challenges because there is hardly any load on the engine in neutral or with the clutch in.

Dieselboy. · Apr 23, 2015

TyCorr said:
Holy ***k, you're alive! I was asking what happened to you the other day. Hope all is well!

Directed at dieseloy^

All is really good. Been busy. Haven't had time for the forums, as lots of locals got word I'm doing tuning.

But my trucks going full built. Got a set of hypermax rods ready to go in and been picking jelichs brain on tips for four digits.

Fingers crossed.

Matt. I usually don't play with the mfd table a ton. But wouldn't pulling a bit of pw and ICP settle the idle down. I've found dripping ICP to just above where it wants to start rolling at idle gives the smoothest results. One side affect is a little haze here and there.

Seems a trade off with larger nozzles. Either a bit if chop and clean. It smooth with a haze on my experience with 200%.

400s are a whole new ball game lol