Lightweight Pulleys - Page 10 - Dodge Cummins Diesel Forum
3rd Gen. Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #109 of 121 (permalink) Old 11-27-2019, 02:56 PM
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You have to start out with it filled to a certain spot in the filler neck , than fill to the same spot every time to get repeated results , as you already found out how much it can vary from different fill rates .
Ha, that was my attempt at humor...I did fill it up to the inside of the neck, it's longer than I thought, so it was safe to do. But, I need to try it again on flat ground, when the wind isn't gusting to 100 mph.


03 QCLB- 19 to 25 mpg with electric parts, and engine mods....
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post #110 of 121 (permalink) Old 11-27-2019, 08:06 PM Thread Starter
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That filler neck method is bad, I got 13 mpg today100 mile trip running in some hills and VERY windy conditions. I will try the filler neck method again on a flat road where I got 33.
Its the only way to do it without having a 5 gallon container (or some known quantity) and running it dry.

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post #111 of 121 (permalink) Old 11-28-2019, 09:41 AM
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True, that's the way I will do it next time I do a strictly mpg run.

03 QCLB- 19 to 25 mpg with electric parts, and engine mods....
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post #112 of 121 (permalink) Old 11-28-2019, 10:13 AM Thread Starter
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True, that's the way I will do it next time I do a strictly mpg run.
i have a vent kit on my tank so every fillup is up to the neck. after the first auto shutoff, i hit the pump again until the next one then done. i always can see the fuel in the neck...

200 mile run this morning on that same route that gave the 25, ambient temps are 28-35* should be interesting. i would expect low 20's pre-pulley & EWP...

will fill up afterwards, noonish...

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post #113 of 121 (permalink) Old 11-28-2019, 10:23 AM
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Ya, I can do that, I have a 50 gal tank in the bed with a vent and roll over valve on a riser so it's always above fuel level, and the neck is 3-4 inches above level also. So as long as I get fuel into the neck it would be really accurate.

Good luck on your run today.

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post #114 of 121 (permalink) Old 11-30-2019, 02:07 PM Thread Starter
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Ya, I can do that, I have a 50 gal tank in the bed with a vent and roll over valve on a riser so it's always above fuel level, and the neck is 3-4 inches above level also. So as long as I get fuel into the neck it would be really accurate.

Good luck on your run today.
what did your do over mpg run give?

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post #115 of 121 (permalink) Old 12-02-2019, 10:58 PM
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what did your do over mpg run give?
Didn't do it yet.

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post #116 of 121 (permalink) Old 01-08-2020, 03:38 PM
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Update on pulley selection, first off, the truck has not moved since last post, so no new mpg #'s. Since I'm only running a 6 rib belt I decided to do some more experimenting and found a smaller 5 1/4" in overdrive pulley VS. 6 1/4" dia 6 rib pulley, and it only weighs 8 oz, Ssshhhzzzaaaaaam! Also, there is no worry at all about slipping since the HellCat uses a 6 rib I don't think spending most of the time below 2000 rpms with no fan clutch, or water pump is going to tax the belt and cause it to slip.
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03 QCLB- 19 to 25 mpg with electric parts, and engine mods....

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post #117 of 121 (permalink) Old 01-15-2020, 02:55 PM
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Update, the new lightweight pulley champ is...OEM pulley 1lb 13oz new composite overdrive pulley 8.4oz.
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03 QCLB- 19 to 25 mpg with electric parts, and engine mods....

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post #118 of 121 (permalink) Old 01-15-2020, 03:48 PM Thread Starter
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Update, the new lightweight pulley champ is...OEM pulley 1lb 13oz new composite overdrive pulley 8.4oz.
Wow thats getting light... but thats a 6 groove pulley right?

AFE PG7 drop in filter, AFE Torque Tube, HTT 2.5 turbo, AFE e-mani, ATS Arc Flo, 50HP DDP , 428k, HPTuners, G56, 25.065 mpg, mpg threads ->https://www.cumminsforum.com/forum/3...l#post23312562
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post #119 of 121 (permalink) Old 01-15-2020, 04:45 PM
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If the 6.25 pulley was spinning 2000rpm, the 5.25 is going 2381. I would wager the weight loss will go unnoticed from the extra work being done. But if you need the speed it's a win win.
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post #120 of 121 (permalink) Old 01-16-2020, 06:34 PM
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Wow thats getting light... but thats a 6 groove pulley right?
Yes, 6 rib. So far I haven't found an 8 rib 5in pulley.

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