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  ^ Top   #31  
Old 08.10.2008
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Quote:
Originally Posted by Markvfl View Post
I'm looking real close at buying an 05 W900 with 475/10OD/3:36's, the ECM says 6.1 overall MPG for 386,000 miles, not great but not terrible and I can live with it. I doubt it would get much better with a 13 or 18 in it. BUT - doing the mods to the Kitty Cat that 550 described - extrude honing the injectors, muffler swap out and wires for a total investment of maybe 2K to get another 4 or 5 tenths and a buncha power are really exciting!

One thing to remember, while looking at lifetime economy.
Fuel has been going up for several years, but most drivers did not start to really cut back to save fuel till recently.
Find out what RPM the sweetspot is on that engine and gearing, and go that speed. Many times you will find that the last driver (prior to fuel going nuts) was probibly driving that truck too fast for optimal economy. You may have a 7 mpg truck sitting there. Also, make sure that the engine idling was taken out. May be even higher.
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  ^ Top   #32  
Old 08.10.2008
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I would say mpg's would be alot higher with a 13 or 18 spd. With 336's you would need to be doing 75 mph to use 10th and I'm not sure what rpm you would be at in 9th but it could be matched alot better with 13 or 18spds. You should be able to get a good deal on the truck though because not many people looking for a truck like that want a 10 spd
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  ^ Top   #33  
Old 08.10.2008
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Originally Posted by 24valve puller View Post
I would say mpg's would be alot higher with a 13 or 18 spd. With 336's you would need to be doing 75 mph to use 10th and I'm not sure what rpm you would be at in 9th but it could be matched alot better with 13 or 18spds. You should be able to get a good deal on the truck though because not many people looking for a truck like that want a 10 spd
assuming 24.5 lp's he would be around 71, 72 to put him in the 1400rpm range. Dropping back to 9th would mean he would have to do 52mph to keep it at the same 1400rpm. I'd say theres alot of milage lost between rears and gears on that truck. Unless your up around Brickman running the flatland at 75 mph all the time. A 3.58 gear would do that truck some justice or a 13/18 spd. From my studies you want your truck to be no lower than 1200 rpm at 55mph in top gear and around 1400 rpm seems to be real close on the sweet spot for most engines as far as milage is concerned. I'd love to hear back from drivers as to what RPM#MPH=MPG's for them.
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  ^ Top   #34  
Old 08.10.2008
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Quote:
Originally Posted by 5mouths2feed View Post
From my studies you want your truck to be no lower than 1200 rpm at 55mph in top gear and around 1400 rpm seems to be real close on the sweet spot for most engines as far as milage is concerned. I'd love to hear back from drivers as to what RPM#MPH=MPG's for them.




1200 to 1400 is going to be the sweet spot for MPGs. When it comes to a CAT any way. I haven't had any experience with the ACERTs. 3406E and C-15s is where my experience is.
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  ^ Top   #35  
Old 08.10.2008
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Originally Posted by Brickman View Post
1200 to 1400 is going to be the sweet spot for MPGs. When it comes to a CAT any way. I haven't had any experience with the ACERTs. 3406E and C-15s is where my experience is.
If we split the difference and say 1300rpm would be prime sweet spot on a CAT he would be in good shape with those gears. 67mph would net him 1315RPM with either 24lp's or 22 talls.
But at 55 he would be luggin her bad at 1079rpm. Dropping to 9th would put you at 1478rpm this is were that 13 or 18 would be nice to have. Dropping to 12/17 would put her at 1271rpm 55mph. This supports my opinion of a 13/18 being able to get better milage than a 10spd.





5mouths slips away to pat himself on the back heeheeheeheeheehee!
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Ignorance scares me, Even in myself.
The only dumb queston is the one you failed to ask.
Just becasue its "legal" doesn't mean it's safe! I know when I need to sleep and when I am safe to drive. Fight the HOS. Write your Congressman.

There is no such thing as a "BACK-HAUL" everything has a start and stop point, If it needs to be moved then it is a load, period. Insurance, tires, fuel,etc... aren't any cheaper heading towards your home than they are going away. BACKHAUL is BS.
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  ^ Top   #36  
Old 08.10.2008
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A 13 or 18 is better because with the smaller RPM jumps you can keep it in the sweet spot for MPGs and power.


I've heard folks claim a 9 or 10 will do better than a 13/18 because you aren't letting off to shift as often.
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  ^ Top   #37  
Old 08.10.2008
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Quote:
Originally Posted by Brickman View Post
A 13 or 18 is better because with the smaller RPM jumps you can keep it in the sweet spot for MPGs and power.


I've heard folks claim a 9 or 10 will do better than a 13/18 because you aren't letting off to shift as often.

I tend to be a PITA and want you to "SHOW" me. Opinions vary but numbers never lie. Unfortuantely short of putting 2 trucks on a dyno with computerized perfect shifts to compare the theory of "letting off to shift more causes worse milage" I am going to stick to my numbers. With a 13 or better yet an 18 I can keep my rpms at a specified rpm giving maximum efficiency far better than a 10spd whether its a manual or an automatic. Even the automatic cannot make up for lack of gear ratios in between the top 5 of a 10spd.
__________________
Ignorance scares me, Even in myself.
The only dumb queston is the one you failed to ask.
Just becasue its "legal" doesn't mean it's safe! I know when I need to sleep and when I am safe to drive. Fight the HOS. Write your Congressman.

There is no such thing as a "BACK-HAUL" everything has a start and stop point, If it needs to be moved then it is a load, period. Insurance, tires, fuel,etc... aren't any cheaper heading towards your home than they are going away. BACKHAUL is BS.
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  ^ Top   #38  
Old 08.10.2008
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The only benefit to the 18 over the 13 is that you can split your low range shifts.

Far as I know high range is going to be the same.
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  ^ Top   #39  
Old 08.10.2008
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Quote:
Originally Posted by Brickman View Post
The only benefit to the 18 over the 13 is that you can split your low range shifts.

Far as I know high range is going to be the same.
They are very close to each other on the low side first 5. I was considering the lower gear splits for mountanous regions really. Otherwise there would be no difference between the 13/18 (5H and up) for milage gearing.
__________________
Ignorance scares me, Even in myself.
The only dumb queston is the one you failed to ask.
Just becasue its "legal" doesn't mean it's safe! I know when I need to sleep and when I am safe to drive. Fight the HOS. Write your Congressman.

There is no such thing as a "BACK-HAUL" everything has a start and stop point, If it needs to be moved then it is a load, period. Insurance, tires, fuel,etc... aren't any cheaper heading towards your home than they are going away. BACKHAUL is BS.
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  ^ Top   #40  
Old 08.11.2008
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Quote:
Originally Posted by 5mouths2feed View Post
They are very close to each other on the low side first 5. I was considering the lower gear splits for mountanous regions really. Otherwise there would be no difference between the 13/18 (5H and up) for milage gearing.
really for road work the lower splits are a waste you will hardly ever use them unless you are way heavy or really do low speed work
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