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Old 02-05-2013, 10:16 PM
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ISX ISX is offline
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Default Dodge Cummins 12 Valve P7100 Timing Table

I threw this together just now. Anyone care to critique!? I'm serious, tear it apart haha. I'd like to make an official (legit looking) version if we can get to a common agreement on some numbers.

Bottom is RPM, left side is load % and middle is timing numbers.

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1997-12V-NV4500-Dana 80/3.54/2wd-350k---21-27mpg
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Old 02-06-2013, 06:23 AM
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Just wondering..... How did you come up with the numbers? I was under the impression that the timing didn't change over the RPM range.
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Old 02-06-2013, 09:35 AM
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Yes you are correct. I just wanted to make a chart showing the optimal timings of each scenario so people can get a sense of where they should be. As in, if you are a hotshotter and you always tow at 2000RPM, you can guesstimate how much pedal you are using and if it's 40% then you should be at 17* ish. Load would have a direct correlation with axle ratio since 4.10's would always have less load % for the same trailer, with the compromise of higher RPM. So if that scenario was 3.55 then a 4.10 might be at 30% load at 2500RPM which is then 19*. Tire size would have an effect, transmission would have an effect because of varying OD ratios.

To me all of these timing questions relate directly to the options of your truck. 16* timing is not optimum for everyone and if they could see what is optimum then they could figure out where they needed to be. Thing is, I also need a separate spreadsheet or just a little line graph showing the results of timing on cold starting so they can factor that in as well. Texas guys could care less whereas ND guys might need to be 5* lower just so the thing will start at -40F.
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1997-12V-NV4500-Dana 80/3.54/2wd-350k---21-27mpg
Removed AFC--No Plate--13.5* timing--BHAF--5" Exhaust--Valair Clutch
1994-Jeep Cherokee-5spd-3.07-4wd-202k---16-19mpg
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Old 02-06-2013, 11:47 AM
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Interesting...
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2002 Dodge Ram 2500, 5.9L Cummins Turbo Diesel, 5 Speed NV4500 transmission, 4x4, 3.55 Gears, AirDog 150 fuel pump with 1/2" Big Line Kit, Stock Bosch VP44 Injection Pump, Bosch RV275 Injectors +40HP, Edge Comp Performance Box, BHAF (Big Honkin' Air Filter), Stock Holset HX35W Turbo, Straight 3" Pipe Exhaust, Crankcase Vent Mod, High Idle Mod, MPG / IAT fooler Mod, ScanGauge II, 25% Tinted Windows, DiPricol Gauges (Fuel pressure, Boost, Pyrometer), 235/85 R16 tires mounted on 16x7 Aluminum mags (weighing 62#), Custom Fog Lights, Custom Backup lights, Silverstar Headlights, 23-24 MPG

1996 Dodge Ram 1500, 5.9L Magnum V8 Gasoline Engine, 46RE Automatic Transmission, 4WD with CAD axle with 3.55 Gears, Mopar Performance PCM, Gutted Kitty, ScanGauge II, 35% Tinted Windows, 16-17 MPG

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