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Old 06-08-2010, 01:54 PM   #1
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How much giddy-up should the coach have?

We are still working on our 1998 38 ft SE, took it out on a test run over the weekend and although the ride was very good for our bad roads it seemed to be a little slow.

It would cruise up to 65 MPH glide along, but it sems to be a little slow getting there on the flat.

It is the Gillig chassis with the 300 HP Cat, I do not expect to leave rubber on the road, but am wondering about reasonable 0-60 expectations so I can determine if we are normal or in need of some work.

We are third owner, second owner never drove it so we are at a loss.

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Old 06-08-2010, 02:45 PM   #2
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My first coach was a 32 ft and had a 6.5 V8 GM Diesel it was rated at 195 HP and 285 Torque. It was slow getting to cruising speed and going up hills, but we liked the coach and got used to the way it ran. For our next coach we wanted slides because we use the coach often and decided on a 34 ft Diesel Pusher that had 330 HP 865 Lbs of torque. It goes great. It has the same engine that the use in 40 ft Motorhomes so I'm sure it doen't perform nearly as well as my smaller, lighter coach. It is all about power to weight ratio.

NOTE; I am not responsible for typos, poor grammer or misspelled word !
04 Itasca, Meridian 34H, 330 Cat/2003 CR V Toad
1933 Ford 3 Window,as seen in Bye Bye Birdie
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Old 06-23-2010, 10:04 PM   #3
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The fastest acceleration from a motor home I ever have had was my old GMC. Drove like a very big van. Our country coach has more than enough power with 505 hp and 40,000 (approx) lbs. But then lots of people write in that have 300-350hp and that seems to be good enough for them. There is always the option of some upgrades from banks.
Bob & Barbara
2002 Country Coach Affinity
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Old 06-23-2010, 10:48 PM   #4
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Most MH's hit 60 in about 22 or more seconds. Thats how fast the old air cooled VW's were.
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Old 06-24-2010, 12:16 PM   #5
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300 HP should have enough get up and go.. But there is one thing I do not know well

I know when I got my motor home (a Damon Intruder 377W the 315 HP Vortec V8 (Gas engine) not only had plenty of pep... but actually impressed me on occasion.

What I do know is this.. The 315 HP Vortec and the slightly more powerful Ford V-10 both produce the same peak torque, and that's what makes you go faster, not HP but Torque. The Chevy V8 peaks (on both Torque and HP curves) way faster than the Ford.. And that.. IS where you really need it.. At low speed (in order to get to fast speed)

What I don't know is the torque curve for a diesel engine.. And your gear box.
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Old 06-25-2010, 04:57 PM   #6
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I run the 8.3L Cummins 300 hp in a rig that weighs 31,000 lbs.

1st gear is not much better than a slow trot by a elderly pedestrian. Once spooled up to second gear things get better. We can cruise at 75mph on the flatlands.

Uphill on 6% grades we max at 35 mph.

Check for exhaust manifold leaks and CAC leaks to see if your system is losing power there. Otherwise, our rig has not failed to allow us to reach our destination on time due to speed issues.
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
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Old 06-26-2010, 12:39 AM   #7
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About the same range

Thanks Dean.

Your 95 is likely built on a Gillig Chassis that is very close to ours except for the tranny and engine mounts to support the diferent engine.

The weights are also very close, we have been going a little nuts because it is the great unknown when you have no reference.

Ours will cuise up at 70 MPH just fine with no roughness at all in the engine.

It had some difficulty climbing up a steep hill nearby from a slow speed, so it may be normal or it could need a little adjustment in the fuel system.

The plan is to pull the bed and check all of the hoses in the after-cooler and turbo, maybe add a leaf blower to the air intake to presurize the system and check for leaks.

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