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Old 03-29-2016, 11:29 AM   #253
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Even the computer on my Ram shifts down to keep the rpms up on acceleration and under load. Between 2500 and 3000 on hard acceleration. It only drops back to 1000 to 1200 under very light load. You can really feel the sweet spot on the cummins. Mine seems to really like 62 mph at around 1900 rpms to cruise flat.
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Old 03-29-2016, 12:20 PM   #254
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1982 31' Airstream 310
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I can definitely feel the sweet spot on the Isuzu but its sooo much higher rpm. 60-61 mph but running at about 2850 or so rpm. Thats WITH the Allison 4sp. But that seems normal compared to others Ive talked with. I would think the Allison would make a bigger difference over the chevy 3sp buy apparently not. Thats on flat roads. Oh well, it is what it is.....I doubt Ill ever go the Gearvendor route but who knows once we are able to travel more. I just make sure Im cruising under 3000rpm. It seems and sounds happy at 2850 to 2900.
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Old 03-29-2016, 05:30 PM   #255
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Sounds a bit high. I've had a few gotta be there trips on the interstate where we've run 75-80. About 2200 rpms. Mileage drops off a little but it seems happy.
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Old 03-30-2016, 03:10 PM   #256
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1984 31' Airstream310
Sullivan , Wisconsin
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Rpm @ 70mph

I finally got my tach working, my axle situation totally ironed out, and got the 310 on the highway this morning before work. I have a 5.9 Cummins, Allison AT545 and a Gear Vendors, not sure on the Diff Gears. At 70MPH i am running exactly 2000RPM.

The previous owner installed a Gas Tach in the 310 so I chased the 3/4-16 threads in the top of the Allison and used the Dakota Digital DSL-2 Flywheel Tach Interface, it takes a few minutes to program, but it seems stable so far.

On the Road again
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Old 03-30-2016, 06:58 PM   #257
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1982 28' Airstream 280
Port Angeles , Washington
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I finally got my tach working, my axle situation totally ironed out, and got the 310 on the highway this morning before work. I have a 5.9 Cummins, Allison AT545 and a Gear Vendors, not sure on the Diff Gears. At 70MPH i am running exactly 2000RPM.

The previous owner installed a Gas Tach in the 310 so I chased the 3/4-16 threads in the top of the Allison and used the Dakota Digital DSL-2 Flywheel Tach Interface, it takes a few minutes to program, but it seems stable so far.

On the Road again
You might want to recheck those numbers. With the factory 4:56 gears and a non overdrive trans with a Gearvendors 70 mph will be closer to 2800-2900 rpm depending on torque converter slip. The differential gears may have been changed and it would be interesting to know to what ratio.

My 280 with a Gearvendors and 4:56 gears is closer to 60 mph at 2000 rpm.
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Old 03-31-2016, 02:48 PM   #258
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The gears in my differential are 3:52
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Old 03-31-2016, 05:07 PM   #259
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The gears in my differential are 3:52
That is indeed a big jump from stock and makes a big difference. How does it feel power wise in overdrive?
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Old 03-31-2016, 10:12 PM   #260
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2000rpm @ 70 mph

I suspect the gears may actually be 3.54 since that is the tallest gears I can find for the Dana 70 HD. The Summit Racing Gear ratio calculator comes up with just under 2500 RPM without overdrive which seems about right since I have overdrive. The previous owner said the gears were 3.52? I will get a hand tach and double check the RPM's at the crank and make sure it all checks out.
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Old 03-31-2016, 10:46 PM   #261
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I would say I am very impressed with the power all the way through the range, it is no race car off the line, but compared to my 21' class c with a 351, it feels like a rocket. When the turbo spools up in second gear and beyond, it feels pretty neat. I am planning a trip to Alaska next summer, maybe we can set up a test drive for you in route.
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Old 04-01-2016, 03:06 AM   #262
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I would say I am very impressed with the power all the way through the range, it is no race car off the line, but compared to my 21' class c with a 351, it feels like a rocket. When the turbo spools up in second gear and beyond, it feels pretty neat. I am planning a trip to Alaska next summer, maybe we can set up a test drive for you in route.
I would love to check out your coach. We did 3 months in Alaska the summer before last and had a ball. Maybe we could even set up a west coast moho get together.
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Old 04-02-2016, 07:28 AM   #263
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Maybe we could even set up a west coast moho get together.
It may take me a while to get there, but count me in.

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Old 04-03-2016, 07:15 AM   #264
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It may take me a while to get there, but count me in.

Cheers
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As my plans firm up, I will keep you informed, as for now, I am meeting a good friend in Jud North Dakota June 15, we will slowly make our way to Prince Rupert to hitch a ride on the water taxi.
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Old 04-06-2016, 06:45 PM   #265
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mayco, I don't know it you're on the right track, but I'm sure going to find out. I'm think with the cummins 15-2500 rpm is a safe operating rpm. Mine starts de-fueling above 2500 rpm. But then I'm still working on it.
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Old 04-12-2016, 05:46 PM   #266
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Once again I came home long enough to play with the 'Silver Bullet'.

Reprogrammed the TCU to shift at 2550 RPM. Rewired the TPS and it's reading to the TCU. Got the new gauges all hooking back up and fired her up.
1-The hardware store ferrules don't work on the 1/8" gauge tube.... They leak.
2- the left pump pressure goes to 'zero' on full throttle which take the high end out of the acceleration.

Guess I'll go to O'Relley's and get the right ferrules and a new lift pump tomorrow.
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