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Old 04-03-2015, 07:01 PM   #141
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Nat is absolutely right --- Unless you plan on building a dragster or a sled pulling rig, keep your rpm's as close to the engines peak torque rating as possible for longevity and mpg's. Playing with the governor will get you more rpm's...but at a very high price. Mind boggling power & torque can be wrung out of these engines when tweaked but the legendary reliability & mileage of diesels goes away rapidly when they are pushed beyond their design limits. Especially when it comes to rpm's.
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Old 04-03-2015, 07:07 PM   #142
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Oh for sure guys! I'm not planning in building a spaceship LOL. But the bus is topping at 55mpg screaming.....don't recall the rpms....lowering that (rpms) would also lower noise levels at cruise speed, don't you think?
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Old 04-03-2015, 07:12 PM   #143
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Yes it would.

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Old 04-04-2015, 12:51 AM   #144
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You really do need to know what rpm's you are pulling. Without that information, everything else has little meaning or value as far as gearing. A couple of hundred rpm can make a very big difference in mpg and overall reliability.
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Old 04-04-2015, 02:37 AM   #145
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Quote:
Originally Posted by Tango View Post
Hey n00b --- actually there are several ways to pick up more top end speed. More often than not, a combination gets the best results. Below are the three most common variables you have to play with.

Rear end (Ring & Pinion Ratio) - Taller gears will make you go faster at any given engine RPM...but only if the engine has enough torque to pull those gears. Typically a small change in axle ratio will yield a small improvement that most engines can handle.

Transmission Final Gear Ratio - This can be modified by going with a different tranny that has higher gearing, finding one with one or more levels of Overdrive, or by adding an auxiliary trans that multiplies what you already have (sometimes called a Brownie Box). As far as I know Brownies only work with standard trans.

Tire Diameter - Often overlooked and actually one of the cheapest fixes there is. Increasing the diameter can have a significant effect.
Example: RPM and Gearing being the same (2240 RPM x 1:1 ratio)...going two inches larger on the tires will take a vehicle from 65mph to about 69 mph.

But...before you get too deeply committed to any solution...play with the numbers on a good calculator. Lots of "what ifs" can be tested out before you spend a dime. I have used the link below with good results, especially the "Manual Entry" calc at the bottom of the page.

Engine RPM Calculator

Good luck with it pardner and let us know what you decide.
This is such useful info. Thank you!
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Old 04-19-2015, 12:57 AM   #146
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Picture time!
All lights are removed
uploadfromtaptalk1429419397592.jpg
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Old 04-19-2015, 01:00 AM   #147
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uploadfromtaptalk1429419478468.jpg
I can reuse most of them, and swap all reds in back, and amber in front, but I think I'll get new ones (or decent used) for some of them....too rusty
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Old 04-19-2015, 01:01 AM   #148
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Disclaimer: If you guys see pics twice, sorry....tapatalk it's being wonky
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Old 04-19-2015, 01:02 AM   #149
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Started (finally!!!!) prepping the outside: the nose is as smooth as a baby's butt!uploadfromtaptalk1429419751657.jpg
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Old 04-19-2015, 01:04 AM   #150
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I also moved the bus today so the tires could move 1/4 turn to avoid getting them square lol
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