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Old 11-30-2021, 12:04 AM   #15
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48.5k going down the road. 38.5 coach and 10k toad. Only has 380hp/1250tq with a 6 speed and has no issues on hills other than falling to lower gears on steep grades. I haven't tried any steep grades with the toad, but without the toad I sustained 38mph through most of the 7% I-8 grade and fell down another gear to around 30mph on the 7.5% section. It's no rocket, but it is never scary on hills either.


The Cummins/Allison programming will try to hold the engine around governed RPM (1800) where possible to maintain power band peak. I wouldn't recommend stuffing the gas pedal or manually downshifting unless you are in a sub-optimal gear (not enough RPM) and want to be ahead of the curve when the load picks up. The worst thing that could happen is you are too fast for the hill and find a slower car in the way. Almost 100% guarantee the loss of speed will downshift you into a very slow gear for the hill and you'll never get it back.



And putting your foot on the floor when it is in a low gear pretty much only guarantees it holds that gear all the way up the hill. Unlike any normal car or truck, the gas pedal is only used to indicate power demand, not how fast you want to go.So if your foot is on the floor (calling for maximum power) the powertrain controller will look at your current load, percentage of maximum power being produced and expected RPM (power point) if it upshifts. It will decide that it will make [i[less[/i] power if it were to go faster and upshift, therefore it will not go any faster. This is why you may (or may not with rear engines) notice the radiator fan cut out when you put your foot on the floor. The engine will sacrifice cooling performance and allow an over-power condition (you'll see the temp gauge climb like a rocket) until it thermally limits on the power boost. The radiator fan(s) are worth about 70-100hp at full engagement.
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Old 11-30-2021, 04:56 AM   #16
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And your curb wt toad is heavier than mine. I'm not expecting a rocket ship but mine is disappointing.


I have ran them all. we had a 2008 Essex and a king aire, I even brought a Ventana back this week and towed my truck I was a little nervous on that one but it did just fine. I normally drive with the cruise as you get 100% of engine performance itís no corvette but gets the job done.
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Old 11-30-2021, 05:20 AM   #17
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We have a LA with the 15L Cummins, if I get below the torque curve, due to being stuck behind a slow truck, I release throttle and manually downshift when I can pass. Other wise it will lug the engine and feel like I am pulling a weighted sled!
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Old 11-30-2021, 06:13 AM   #18
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It would be worth a call to Cummins Care to discuss your specific situation.
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Old 11-30-2021, 06:50 AM   #19
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I have a 2019 London Aire with the 605 hp pulling a RAM 1500 Out west here if I get stuck behind a slower vehicle on some of these steeper grades it is almost impossible to get back up to speed. It's when you get behind the power curve you have the problem. As long as I stay rolling I have no problems with slowing down.
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Old 11-30-2021, 07:15 AM   #20
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60k going down the road Attachment 350132
I agree with other comments, that is a beautiful coach. Love the color scheme.
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Old 11-30-2021, 10:06 AM   #21
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Thanks guys. I have an appt. with the Cummins Doc. Unfortunately though, I have to wait till Jan 7th.
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Old 11-30-2021, 10:31 AM   #22
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I have a 2014 MADP with a Cummings 450 Hp in it, pulling a loaded Ram 1500 4X4. The trick is to keep your RPM's up as you approach the grade- I try to hit 2000 RPM at the start of the grade & keep it pedal to the metal all the way up. I generally don't get below 50 MPH unless the grade is >6%. If I have to, I'll manually downshift to keep the RPM's above 1,600. You don't want to drop below that as you'll start lugging the engine as it falls below the power curve.

Happy Trails
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Old 11-30-2021, 11:23 AM   #23
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Have you tried that hill without the toad behind you ?

That will at least give you a baseline of how it does. Then head to Mr. Cummins.
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Old 11-30-2021, 04:22 PM   #24
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Have you tried that hill without the toad behind you ?

That will at least give you a baseline of how it does. Then head to Mr. Cummins.
No sir. Unfortunately I'm 3 hrs away from the mountains.
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Old 12-01-2021, 04:50 PM   #25
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I find that it depends alot on what speed you approach the hill.

Honestly is doesn't sound right but If I hit the hills over 70 I roll right up them with minimal loss

If I hit the hill at 60 speed falls more so.

I use cruise control as much as possible.

I pull a 12,000 trailer behind my Ventana 4369 which has the L9 451 HP 1250 lb ft. engine program.

Or I am pulling my Jeep Gran Cherokee Trail Hawk.

Surprisingly there is not much difference between the 2.

There may be something wrong with your rig.

Ted.
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Old 12-01-2021, 05:00 PM   #26
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I find that it depends alot on what speed you approach the hill.

Honestly is doesn't sound right but If I hit the hills over 70 I roll right up them with minimal loss

If I hit the hill at 60 speed falls more so.

I use cruise control as much as possible.

I pull a 12,000 trailer behind my Ventana 4369 which has the L9 451 HP 1250 lb ft. engine program.

Or I am pulling my Jeep Gran Cherokee Trail Hawk.

Surprisingly there is not much difference between the 2.

There may be something wrong with your rig.

Ted.

Share how you boosted your 400 to 451 ? Was that a Cummins tune?
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Old 12-01-2021, 08:24 PM   #27
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ID:	350317 you should have much more power than that. Have it put on a scanner to see if you have any underlying problems not throwing a code. We are pulling 3 times that weight through the Rocky Mountain region with twice that performance.
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Old 12-02-2021, 06:22 AM   #28
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Share how you boosted your 400 to 451 ? Was that a Cummins tune?
Yes sir as soon as I got home from Florida where I purchased it I contacted my Freightliner dealer for an Uprate.

Cost on a new coach was 13xx.00 and maintains the factory 5 year 100K warranty.

As mileage is gained cost for uprate goes down I have heard of guys getting it for a couple hundred out of warranty.

You can read about it here.

https://www.irv2.com/forums/f123/any...hp-468716.html
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