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Old 03-24-2016, 02:47 PM   #15
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Seriously speaking. If someone wants to exceed manufacturer's limits, it always breaks down into two major camps..."no problem" and "problem".

I'm not trying to say anything bad about the OP but when someone says they know the limits set by the manufacturer and think about ignoring them, what else is there to say but...good luck. After all, the world won't stop turning whether something breaks or not.

While I agree there is probably some fudge factor in Honda's limits, I make every attempt to stay within them. YMMV.
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Old 03-26-2016, 12:47 PM   #16
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Your peak torque for that engine is 1400 rpms, however if your MH is like mine it will not shift into 6th gear until 57 mphs. I try to get my speed b/t 60-62 mph for the best fuel economy and torque.
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Old 03-26-2016, 12:57 PM   #17
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Quote:
Originally Posted by Boyle908 View Post
Hello again,
Tiffin Phaeton 2016, Cummins 380hp, Allison 3000

I am all set up for towing my 2014 Honda CR-V four down. I drove about 70 miles last week making all kinds of turns, braking etc. All worked well!

My question is towing speed. The book says not to exceed 65mph. I normally run approx. 65-67 deppending on trucks etc. which can vary from 64 to 68 depending on incline/rolling hills, also what about long hill descents which sometime can run up to and over 70

I don't see it as an issue but would value your opinion?

Michael
Na, no problem. Why would Honda make such a ridiculous statement? Furthermore, you own it.
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Old 03-26-2016, 01:05 PM   #18
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It's highly unlikely if you go 1-2 mph over its going to fail. I would bet money that 65 mph on a RV's speeds is different vs 65 MPH on a gps

If it states 65 max, I wouldn't do 70+ however a few mph above is probably pretty close to a gps 65
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Old 03-26-2016, 01:19 PM   #19
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Ok, I can go 90 MPH for 30 minutes and 30 MPH for 30 minutes. That's still about 60 MPH right ? But not with a GPS ?
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Old 03-26-2016, 11:17 PM   #20
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Ok, I can go 90 MPH for 30 minutes and 30 MPH for 30 minutes. That's still about 60 MPH right ? But not with a GPS ?
My point is typically vehicle speedometers are not 100% accurate, the faster we go the more they are off actual speed. Newer vehicles are much closer to actual speed vs even 10 years ago.

The most accurate way to know speed is with a gps. Tire pressure, size of tire and even the weight if the vehicle can alter what the speedo shows. Thus 90 mph for 30 minutes plus 30 mph for 30 minutes might not equal 60 mph average for a hours.
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Old 03-26-2016, 11:23 PM   #21
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Thank you for the response and information. I just emailed Cummins re Torque, efficiency range etc. With my previous ISB 340hp they gave me the optimal revs for economy. torque etc and they were right on, I could not better it despite lots of attempts

Now a ISL 380hp, funny thing there is no real information in the manuals I received etc.

Thanks again,
Mike
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Old 03-27-2016, 09:50 AM   #22
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Na, no problem. Why would Honda make such a ridiculous statement? Furthermore, you own it.
No problem - only cost me $4,000 to get a new transmission in my Honda Fit

Get a jeep if you want no speed restrictions
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Old 03-27-2016, 10:57 AM   #23
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Originally Posted by NC25T View Post
My point is typically vehicle speedometers are not 100% accurate, the faster we go the more they are off actual speed. Newer vehicles are much closer to actual speed vs even 10 years ago.

The most accurate way to know speed is with a gps. Tire pressure, size of tire and even the weight if the vehicle can alter what the speedo shows. Thus 90 mph for 30 minutes plus 30 mph for 30 minutes might not equal 60 mph average for a hours.
So far our coach speedometer is within one MPH of our two GPS readings.
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Old 03-27-2016, 11:12 AM   #24
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With my experience I've come to the following conclusions for my Cummins 450 at 44K combined weight:
- Good fuel economy is achieved at 6th gear / 63 mph / 1650 RPM (overall MPG = 8.0)
- Best fuel economy is at 6th gear / 55 - 57 mph / ~ 1550 RPM (overall MPG = 8.8)
- A travel day of 5 - 6 hours at 65 - 67 mph achieves the following:
-- MPG is ~ 7.4
-- Arrive at destination ~ 10 minutes earlier than 63 mph
- At speeds less than 65 mph I have the best balance of safety, economy, systems life cycle and timeliness ...
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Old 03-27-2016, 11:23 AM   #25
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Quote:
Originally Posted by NC25T View Post
It's highly unlikely if you go 1-2 mph over its going to fail. I would bet money that 65 mph on a RV's speeds is different vs 65 MPH on a gps

If it states 65 max, I wouldn't do 70+ however a few mph above is probably pretty close to a gps 65
I thought I was the best at getting into the weeds. LOL

Seriously, we could endlessly debate GPS vs Speedometer differences and through into it tire rotation, drive shaft revs and every other mechanical affect. Then there is even comparing relative MPH from coach to toad.

Even as anal retentive as I am, I don't think a difference in either direction of GPS vs speedo readings has any serious bearing on this issue. In other words, if you are doing 65 in the coach and the GPS says 66, enjoy the drive.

BTW...just to show how anal retentive I am, I know my car's speedo shows 64 when I and doing 65 on the GPS...in THEORY that means I could tow at 66 MPH as shown my my coach's GPS when towing? It could drive someone crazy!

BTW...I no longer use my car or coach's speedo anymore. I use the GPS speed read out which matches my dash cam speed read out.
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Old 03-27-2016, 11:43 AM   #26
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We tow a CRV. The book says Do not tow over 65mph for a sustained time.
We asked Honda and were told that Honda has been checking any
transmission problems under warranty to see if vehicle is being towed.

We like to set the cruise on the MH at 60 and enjoy the country.
We are retired, in no rush, and try to limit our travel to a max. of
250 miles per day.
We have been to the east coast and back three times in the last three
years, put 37K on the MH towing our CRV.
Both units get full service each year.

Not interested in paying for unneccessary repairs.
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Old 03-28-2016, 10:45 AM   #27
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Quote:
Originally Posted by Lv2Roam2 View Post
With my experience I've come to the following conclusions for my Cummins 450 at 44K combined weight:
- Good fuel economy is achieved at 6th gear / 63 mph / 1650 RPM (overall MPG = 8.0)
- Best fuel economy is at 6th gear / 55 - 57 mph / ~ 1550 RPM (overall MPG = 8.8)
- A travel day of 5 - 6 hours at 65 - 67 mph achieves the following:
-- MPG is ~ 7.4
-- Arrive at destination ~ 10 minutes earlier than 63 mph
- At speeds less than 65 mph I have the best balance of safety, economy, systems life cycle and timeliness ...
Very similar results with our 15 Tour. We are slightly heavier at 53,000+. Had an issue and took the coach to Freightliner. While there they re-flashed the ECM. Mileage improved. Mechanic said the ECM should be re-flashed every couple years.
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Old 03-28-2016, 12:00 PM   #28
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.... Mechanic said the ECM should be re-flashed every couple years.
What ?!? That's a good one

Why? did he say just because the flash can degrade ?!?

Your flash is a computer program,
it doesn't need reloading unless the computer or the program changes

and typically once defined, it probably won't change


and re speed ? our rv tires are rated at 75 mph and the toads at 100 or so - so the towed can pass us safely
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