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12-10-2017, 06:45 PM
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#1
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Junior Member
Join Date: Mar 2017
Location: west chester
Posts: 1
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down shifting
I'm hoping someone can answer this:
When driving our Jayco Precept 31UL and cresting a hill the unit downshifts a couple of gears and the RPM jumps up to 4-5 thousand RPMS. Is this normal - no one seems to have an answer - I talked to Ford and they couldn't answer it either. They told me to bring it in and they would drive it - and if it happened they could address it. It doesn't happen all the time, but would love to get this fixed, if it is not normal.
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12-10-2017, 07:22 PM
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#2
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Senior Member
Join Date: Nov 2017
Location: anytown
Posts: 1,751
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Sounds like it has some sort of engine tune or feature which allows the gas engine to behave more like a diesel with an exhaust brake.
One rule of thumb when driving is whichever gear is used to get up the hill should be the same gear used to get down.
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12-10-2017, 09:15 PM
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#3
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Member
Join Date: Dec 2016
Location: Calgary
Posts: 65
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Check your Ford manual page 34 (on my manual) its called: Forced Downshifts.
If you drive with the cruise control on it will downshift to very high rpm's if you go downhill. Keep in mind that it is doing this to keep the speed programmed. Forced Downshifts is on also if the tow/haul feature on or off. It is a feature of the transmission. There are many posts in the internet about that. google: ford Forced Downshifts motorhome
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12-10-2017, 09:39 PM
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#4
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Member
Join Date: Dec 2016
Location: Las Vegas
Posts: 61
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Mine does this also, i’m sure they all do. Drives me crazy seeing the RPM’s over 4k screamimg like that.
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12-10-2017, 11:56 PM
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#5
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Senior Member
Join Date: Mar 2015
Location: Prescott Valley
Posts: 179
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Area you using the Tow/haul mode when going thru hills?
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12-11-2017, 07:13 AM
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#6
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Senior Member
Join Date: May 2014
Location: North Western West Virginia
Posts: 671
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Tow haul doesn't effect the forced downshift. It's to save the brakes on long steep downgrades... the V10 was designed for high RPM's, don't worry about it.
We used tow haul on the 5 speed tranny in the old motorhome, but we've never had to use it with the new motorhome, as it has a 6 speed tranny.
__________________
The Logan's
2018 Jayco Alante 31v
Me, Dear Wife,
2 Bluetick Hounds
1 Newfoundland
1 Newfoundland / Black Lab Mix
1 Cairn Terrier
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12-11-2017, 12:03 PM
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#7
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Junior Member
Join Date: Sep 2017
Location: Highland
Posts: 23
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I looked at some other forums on RV towing especially gas vs diesel posts. It seams the Ford V10 is made to run comfortably above 4000 rpm and can run at 5000 rpm when climbing with a load. You might check out those resources. I found them helpful.
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12-11-2017, 02:22 PM
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#8
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Senior Member
Join Date: Apr 2016
Location: Fortuna Foothills
Posts: 1,862
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We drive mountain passes quite frequently and there is a workaround for this. I keep my 35S in tow haul mode while ascending the grade. As we descend and the transmission drop gears I just take it out of tow haul mode and it will upshift right away.
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12-11-2017, 04:09 PM
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#9
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Senior Member
Join Date: Sep 2013
Location: Wentzville
Posts: 272
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Quote:
Originally Posted by Vicr
We drive mountain passes quite frequently and there is a workaround for this. I keep my 35S in tow haul mode while ascending the grade. As we descend and the transmission drop gears I just take it out of tow haul mode and it will upshift right away.
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I had posted on this subject a while back. 4000 rpm is unnerving, is good to hear that it is ok. This tow haul workaround is something I’ll definitely be experimenting with the next time I’m in the mountains. I gather the V10 has electronic rev limiting. Is the limit 4000 rpm? I can’t recall whether or not i’ve seen anything higher than that. Would explain why the tach shows no red line, I suppose.
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12-11-2017, 04:49 PM
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#10
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Senior Member
Join Date: Mar 2015
Location: Odessa
Posts: 409
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5 star tuning
Many people are unhappy with the V 10 engine and transmission combination - I hear that 5 Star Tuning can make it much better ( no personal experience )
__________________
Les & Sandy
2016 Seneca HJ - Scangauge D - Truma Comfort
560 watts solar - Blue Sky 3024iL -IPN ProRemote - Trojan T-105RE
Good Sam Life Member - FMCA Member - Passport America
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12-11-2017, 09:53 PM
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#11
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Senior Member
Join Date: Sep 2013
Location: Wentzville
Posts: 272
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Quote:
Originally Posted by Les7h
Many people are unhappy with the V 10 engine and transmission combination - I hear that 5 Star Tuning can make it much better ( no personal experience )
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There seems to be a question about whether the 5 Star Tuning makes sense with the newer 6 speed transmission.
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12-11-2017, 10:19 PM
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#12
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Senior Member
Join Date: Apr 2016
Location: Fortuna Foothills
Posts: 1,862
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Quote:
Originally Posted by Les7h
Many people are unhappy with the V 10 engine and transmission combination - I hear that 5 Star Tuning can make it much better ( no personal experience )
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The five star tune is for 2015’s and earlier with the 5 speed transmission. The 2016 and newer with the 6 speed works very well. I live in the west where we have real mountains and the engine/trans combo is a pleasure to drive.
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12-12-2017, 11:42 AM
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#13
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Senior Member
Join Date: Sep 2015
Location: frankfort
Posts: 392
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Recently we took our 2016 31ul with 6 speed over one 11k foot pass and two over 8k foot passes. The six speed shifts down readily with a touch of the brake. I had no problems going down Monarch Pass in Colorado using very little brake and letting the tranny do it's thing. The v10 sings a little at higher rpm but that's the nature of the beast.
__________________
2016 Jayco Precept 31 ul
2016 Jeep Grand Cherokee toad
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12-12-2017, 11:56 AM
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#14
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Senior Member
Join Date: Jun 2015
Location: --
Posts: 2,392
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5 star does improve the V10 in most ways, particularly the ones w/ the 5spd.
__________________
2023 Ford F-150 XLT SCREW 3.5EB (Max Tow Pkg., Black Appearance Pkg., Bed Utility Pkg.)
1727 Payload / 4150 RAWR
On the sidelines taking it all in.
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12-12-2017, 02:05 PM
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#15
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Senior Member
Join Date: May 2014
Location: North Western West Virginia
Posts: 671
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When we looked into 5 Star, I checked with Ford before we bought... The dealership checked with the warranty center in Michigan, and were told that if any power-train component fails with 5 Star (or any other similar device) installed, the warranty would not be honored.
The service manager told me that the recording component of the engine control computer would show if any unapproved device had changed the factory shift points.
So, we didn't buy it.
__________________
The Logan's
2018 Jayco Alante 31v
Me, Dear Wife,
2 Bluetick Hounds
1 Newfoundland
1 Newfoundland / Black Lab Mix
1 Cairn Terrier
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12-12-2017, 02:08 PM
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#16
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Senior Member
Join Date: Apr 2016
Location: Fortuna Foothills
Posts: 1,862
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Quote:
Originally Posted by Les7h
Many people are unhappy with the V 10 engine and transmission combination - I hear that 5 Star Tuning can make it much better ( no personal experience )
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Your 2016 should have the 6 speed. The 5 Star Tune does very little for the 6 speed.
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12-12-2017, 08:04 PM
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#17
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Senior Member
Join Date: Sep 2017
Location: midwest
Posts: 1,211
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Most vehicle have had the redline removed from the tach.. maybe the stick shifted sports cars still have them? The computers now are so advanced with timing, fuel, air, exhaust and rev limits that they will shut off fuel if you force the RPMs high in a manual gear situation...
So put it in 1st and give it gas when it hits rev limiter it will stop delivering fuel to the engine... same with going down hill, if you try and downshift to a gear lower than the available RPM's it won't allow you to do it.. you have to brake to get the speed down and then it will downshift... at least that is how it works on mine.... and I bet fords as well..
When you change the shift points with an aftermarket product you could change the rev limiters out of OEM specifications causing engine damage, that is why ford/gm and others won't honor the warranty... This really started back in the mid 2000 with diesels.. people chipped them and took the motors out of OEM spec...
which is why many of these products are warranty breakers...
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12-13-2017, 07:24 AM
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#18
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Senior Member
Join Date: Sep 2015
Location: frankfort
Posts: 392
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I can understand the mfg. When I worked for a printer company, some people complained about printer function or print quality. Upon my visit, many times I could see they refilled their toner cartridge with cheap toner causing the problem. Our company made it's own toner, tested in all temp and humidity and even at altitude and extreme storage conditions. Guess what, we don't test someone's cheap toner or guarantee it.
__________________
2016 Jayco Precept 31 ul
2016 Jeep Grand Cherokee toad
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12-13-2017, 07:03 PM
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#19
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Member
Join Date: Jun 2016
Location: The Villages
Posts: 67
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Quote:
Originally Posted by hawkster
Recently we took our 2016 31ul with 6 speed over one 11k foot pass and two over 8k foot passes. The six speed shifts down readily with a touch of the brake. I had no problems going down Monarch Pass in Colorado using very little brake and letting the tranny do it's thing. The v10 sings a little at higher rpm but that's the nature of the beast.
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As someone who has not yet tackled peaks of that height, your post is encouraging. Where you towing your jeep at the time?
__________________
2017 Precept 31UL
Chevy Equinox
SMI Stay and Play Braking system
Roadmaster Falcon Tow bar
Henderson rear trac bar
Safe-T Plus
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12-13-2017, 07:41 PM
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#20
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Senior Member
Join Date: Sep 2015
Location: frankfort
Posts: 392
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On the 11k pass I disconnected Jeep before going over. Glad I did. On 8k peaks did pull Jeep. It was ok but a lot of revs.
__________________
2016 Jayco Precept 31 ul
2016 Jeep Grand Cherokee toad
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