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Old 03-18-2013, 04:38 PM   #15
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Quote:
Originally Posted by DaveTN View Post
This is what I was rolling around in my head, just that huge difference between my expedition rolling at 80mph @ only 2700 RPMs, then I get in the Jayco (ford 450) and I assume with the heavy weight I seem to always be at 3-4,000 RPM's even at 55 and it is hard to get used to and made me worry a bit. So I assumed the weight (expedition vs Jayco being 5,800 versus 15,000) was responsible for the difference.
The weight is indirectly responsible, because it presumably caused the vehicle designers to spec a different rear end ratio which which is in turn directly responsible for the difference.
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Old 03-18-2013, 06:42 PM   #16
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Quote:
Originally Posted by DaveTN View Post

This is what I was rolling around in my head, just that huge difference between my expedition rolling at 80mph @ only 2700 RPMs, then I get in the Jayco (ford 450) and I assume with the heavy weight I seem to always be at 3-4,000 RPM's even at 55 and it is hard to get used to and made me worry a bit. So I assumed the weight (expedition vs Jayco being 5,800 versus 15,000) was responsible for the difference.
It does take a while to get use to the high RPM's especially when they jump to 4,000 and stay there. My F250 with the same motor only does that when I stomp on it to pass someone. Never goes over 3,500 when fully loaded towing or driving.

Check out the 5-Star computer upgrade. Made a huge difference in my unit. I seldom have RPM's over 3,500 now, even towing my Wrangler. My gas mileage also improved.... All be it 1 mpg...

Good luck and safe travels.
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Old 03-18-2013, 07:02 PM   #17
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Sparky you are correct, however that was not what was asked.

"Would the 26 have lower RPM's when traveling at the same speed" Is the question asked.

Please note nothing was said about going up and down hills, starting and stopping.

Now if the poster did not mean what he asked, that is one thing. One thing I have learned is to be precise. When I ask How do I get to Rome. I will say How do I get to Rome Georgia. Kinda like when I was a FAC pilot. I was careful where I marked my targets. Someone's life depended on it.

Love ya brother
Just like a member of the brass.... Take part of what is asked and stated and formulate an answer that does not answer the problem.

Re-read his original post completely and then review my reply. You are correct if you simply answer THE question you pull from his post. You are incorrect when addressing his concern and issue.

The vehicles MAY travel at the same speed while at the same RPM's. That is if on level ground and once the larger unit gets up to speed. The last paragraph of his post clarified his concerns and question. I answered his concerns and question based on his entire post not the simple question you pulled.

Sorry Captain but your answers miss lead and don't accurately reflect what actually is going on with the motor home when being driven.
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Old 03-18-2013, 08:07 PM   #18
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I hate to be a pain in the brass here, but........

The OP asked if his larger C would run at the same RPM's as a smaller 26' C would.

If the smaller C was on the same, presumably E450 chassis, as his larger one then yes, it would.



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Old 03-18-2013, 08:40 PM   #19
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Quote:
Originally Posted by DaveTN View Post

This is what I was rolling around in my head, just that huge difference between my expedition rolling at 80mph @ only 2700 RPMs, then I get in the Jayco (ford 450) and I assume with the heavy weight I seem to always be at 3-4,000 RPM's even at 55 and it is hard to get used to and made me worry a bit. So I assumed the weight (expedition vs Jayco being 5,800 versus 15,000) was responsible for the difference.
The original posters reply might help ya Captain. Now I see the problem.... I would never argue with a Marine officer.... There is no point.... They have never been wrong in their history.... I am sorry for my error.
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Old 03-19-2013, 12:59 AM   #20
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Folks - this spec sheet may help.


https://www.fleet.ford.com/showroom/...hure_LoRes.pdf

http://media.ford.com/images/10031/2011_SD_Specs.pdf

You will see that the rear axle ratios are indeed typically different in most cases between the two, contributing to different RPMs at cruising speeds.
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Old 03-19-2013, 04:22 AM   #21
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Smile

Sparky,

What is the 5 Star tune? I am not familiar with that.

Thanks

Dave
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Old 03-19-2013, 08:44 AM   #22
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Sparky,

What is the 5 Star tune? I am not familiar with that.

Thanks

Dave
Captain Dave,

www,5startuning.com

It is a system to change programming of computer to adjust timing, control torque converter, shift pressure and schedules, and fuel delivery control.

It really made a difference in my 2008 Winnie.
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Old 03-19-2013, 03:32 PM   #23
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Captain Dave,

www,5startuning.com

It is a system to change programming of computer to adjust timing, control torque converter, shift pressure and schedules, and fuel delivery control.

It really made a difference in my 2008 Winnie.
Sparky,

Maybe you cannot answer this question, but I am seriously considering this 5 star tuning, have not called Mike or whatever his name is there. How desparately should I get this, is it going to make the motor last longer? We have a couple of trips planned for this summer that are about 16 hours of driving one way to get there through some different terrrain which we plan on meandring through. How hard is the RPM spike is on the motor, tranny and so forth? Talking to my local mechanic he is pretty skeptical of any tuning's for a gas motor and does not think they pay back in gas mileage at all. That mechanic is also a auto not an rv mechanic. thanks
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Old 03-20-2013, 02:17 AM   #24
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Sparky,

Maybe you cannot answer this question, but I am seriously considering this 5 star tuning, have not called Mike or whatever his name is there. How desparately should I get this, is it going to make the motor last longer? We have a couple of trips planned for this summer that are about 16 hours of driving one way to get there through some different terrrain which we plan on meandring through. How hard is the RPM spike is on the motor, tranny and so forth? Talking to my local mechanic he is pretty skeptical of any tuning's for a gas motor and does not think they pay back in gas mileage at all. That mechanic is also a auto not an rv mechanic. thanks
Beeker6...

I would not say it is "desparately" needed... My experience with the 5-Star is all I have to go on... I normally got 6-7 mpg when NOT towing my jeep wrangler. When towing the jeep I would get 6 mpg at the very best. My RPM's would spike at 4,000 trying to maintain 63 mph on a 4-5% grade.

I changed my air filter to a K & N and added the 5-Star. On my first trip with these two changes resulted in a different experience. My mpg hovered between 7 and 8 mpg. The tranny did not downshift as often and seldom hit the 4,000 RPM range. The shift profile changed to where I now use all five gears instead of four. This has resulted in the engine not working as hard and working smarter. Most of my travels are in California, Arizona, Utah, Wyoming, Colorado.... all hill country and altitudes of 4-11,000 feet. Prior to the 5-Star I struggled to maintain 63 mph (my normal driving speed) especially when you threw in a hill of any kind, without having the RPM's hitting 4,000+. Add the wrangler and it got worse.

The ford V-10 was designed to run at the high RPM's in the E-450 motor home chassis. So it is not doing any damage if the oil and transmission fluid is changed on a regular schedule. I usually changed my oil and filter every 5,000 miles and switched to a synthetic. I change the transmission fluid and filter every 12-15,000 depending on how often I am at altitude. I have a family member who is a ford mechanic (34 years and still wrenching) and he is the one who told me about the 5-Star. He installed it in his motor home. I have talked to others who have installed it and without exception every one of them noticed improved power and lower RPM's. Most said they got a small increase in gas mileage. Those that did not said they often traveled along at 65-70 mph towing their toad.

I would purchase it again. The savings on gas will not justify the purchase. I got it to eliminate the high RPM's and correct the idiodic shifting of the transmission that ford programed into the E-450 motor home chassis.

Hope this helps. Be safe and have a great trip.
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