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Old 12-15-2008, 12:06 AM   #1
chuckyboy
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Default SUPERNOVA RIDE !!!

my supernova,6400, has 8000 miles on odometer. had rear shocks installed ,ride still sucks. oscillates bad on bridges, CAN SOMEONE HELP ME? .WILL A STIFFER SPRING HELP ME , OR HURT ? THANKS
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Old 12-15-2008, 04:58 PM   #2
Texas TC
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I would think the springs should not be changed. I have not driven a 6400 but have had some concerns about them since they were introduced. I have one of the first 6331 models made in early 2007 and I really think the setup is best for the short frame coaches. First of all, the wheelbase to length ratio on the 34' is .65 which is the best ratio I have seen in the industry. The 6400 ratio is .58 even with the longer wheelbase which gives more rear hang over to cause the coach to handle worse in certain situations. Second, my coach fully loaded with driver, passenger, gear, fuel, and water weighs 21,600# on a certified truck scale which leaves a lot of extra CCC before hitting the GVWR of 25,999# listed in the coach as gross acceptable weight. I have not seen what a 6400 weighs in the same configuration. Third, the balance on the 6331 is 42.5% on the front axle and 57.5% on the rear (again loaded as described above).

I may be totally off base here because I have not seen the statistics I have listed for mine on the 6400. It just seems to me that the extra overhang and weight in the rear of those models. not to mention the extra capacity for water, must take away from the balance attained with the 6331.

Mine is not perfect my wife reminds me. It is perfect from the drivers seat but is a bit bumpy in the rear of the coach. Unlike some who have posted here that they have actually broke mirrors and wood. All I have ever done is bounced some clothes off the hangers in the wardrobe closet. Other than that, all is great with our coach and we have over 24000 miles to date on it.

I hope you find some resolution to your problem. I just don't think springs are the answer. I am affraid that it is in the balance of that size coach. JMHO.



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Old 12-15-2008, 09:57 PM   #3
pchicky
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What year model is your 6400? I have an '09 model and have not had any of the bounce problems that you have mentioned. I wonder if they have done something different on the suspension for the '09 models.

I have traveled with the tanks about 2/3 full (which means more weight on the back, and still no bouncing issues.

As T.C. mentions, the ride in the coach is a little bumpier than up front, but it's 100% better than the Kodiak chassis I had before.
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Old 12-15-2008, 10:16 PM   #4
JimBob
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TC has the 34, I've got a 37, and Paul has the 6400 like you have, we're sort of the 3 Musketeers of Super Nova on the forum.

Like my compadres, we are aware of a real bumpy ride in the back if you are lying on the bed, but like TC, have never broken anything in the wardrobes in the back.

There is a forum contributor Jeff, I belive, who has talked about adding a 10-12 thousand dollar air ride suspension in the past, and speaks highly of the addition, not sure if he has the same symptoms or which model he has.

I'm liking TC's synopsis of the situation, while I'm not an engineer, it probably has more to do with the long overhangs and weight distribution more than anything else. I believe each of us had Senecas or similar models before we owned Super Novas, and all of us agree that the Nova's ride is markedly better. I do know that Senecas were voluntarily upgrading the rear springs on their 36 models due to a somewhat spongy ride in the 08 models, anyway.

Keep us posted on your situation, please.

Travel safely, happy holidays

Jim Bob
08Super Nova
Greenwood, SC
http://jimbobmissbetteandbuster.blogspot.com
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Old 12-16-2008, 02:19 AM   #5
chuckyboy
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HEY THREE MUSKETEERS, MY SUPERNOVA IS 2008,SUSPENSION IS IDENTICAL 2009-2008. HAD MY COACH SCALED THIS WEEKEND,FULLY LOADED WITH NO PASSENGERS,(WATER, PROPANE FULL,140 GALLLONS OF FUEL,) WAS 18700 REAR ,7000 FRT. 25700 TOTAL . PUT WIFE ,KIDS CLOTHES ,ETC,FOOD ETC, AND IWOULD HAVE TO BE OUT OF MY MIND TO PULL INTO SCALES !!. AS FAR AS AIR SUSPENSION ,THEY SHOULD OF PUT IT ON AT FACTORY! . SPOKE TO ENGINEER AT INTERNATIONAL, THEY HAD NO IDEA THAT GULFSTREAM EXTENDED FRAME RAILS 8 TO 10 FT. WHEN I TOLD HIM THE LAYOUT OF COACH ,AND EVERYTHING BEHIND REAR AXLE, HE WAS SCRATCHING HIS HEAD ! I TRULY BELEIVE THE ENGINEERS AT GULSTREAM HAD THEIR HEADS UP THEIR ASS WHEN THEY DESIGNED 6400!!!!
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Old 12-16-2008, 11:07 AM   #6
Georunner
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I don't want to question your scales, but your weights are so much different than mine, that if they are correct, I would agree something in the engineering is amiss. I have the 6331 and my weights are #9,500 on the front axle, and #12,000 on the rear, fully loaded with fuel, water, holding tanks, wife, dogs etc. I would wonder where over #4,000 came from. Extending the frame and making the additions to the 40 ft model don't seem to add up to 2 tons. If they do, I can see why your rig would bounce in the rear. Don't have a solution, just observing and commenting.
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Old 12-16-2008, 11:37 AM   #7
Texas TC
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Geo, your weights are almost identical to mine. Should be, same size coach.

Chucky, your weights confirm my concerns about the 6400. It is almost at maximum weight for the chassis. The loaded weight is at the rear of the coach which unloads the weight on the front axle and skews the balance.
Maybe you do need to change the rear springs. Your weight on the rear axle exceeds 17,500# that is listed as the capacity of the springs on my coach. If yours is the same, you are not getting any spring action at all and they are probably completely compressed. IMHO.



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Old 12-16-2008, 07:53 PM   #8
pchicky
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Wow....this is starting to get interesting.....I had mine weighed, albeit with only the diesel tanks and propane full and nothing in the water or grey/black tanks....it came in at 22,863, which 2837 less than your 6400....even if I filled my tanks full (150 gal fresh and 104 gal grey and black @ 8.34 pounds per gallon, or 2118 lbs), I'd still be 719 lbs lighter. You didn't mention if your grey or black water was filled when you did your weight measurements....I'm assuming you did, or our difference would be much higher.

With the fresh water tank being 150 gal. capacity and being located behind the rear wheels, I can understand the additional weight providing more momentum in a "bouncy" road situation.

Do you pull any kind of trailer that puts tongue weight on the hitch? That would definitely amplify the problem given the distance from the rear wheel to the hitch point on the 6400.

I had my water tank filled 3/4 of the way full on a 600 mile trip and didn't get any bounce, so I'm still puzzled why yours did, unless the additional weight of grey and black water tanks causes it or a trailer does.

Hmmmm, the mysteries of the universe.

I'll say this though....the Kodiak I had was a 33 footer and that dang thing was flat out unstable (I'm talking real white knuckle driving) until I put a Roadmaster sway control kit in the rear and upfront. I don't have that problem at all with my 6400.....
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Old 12-16-2008, 08:32 PM   #9
PieEye
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I've only driven mine about 500 miles so far and it was completly empty except for the fuel tanks. I haven't experienced any bounce to speak of and in general I'm very happy with the way it rides. Granted, its not the same ride as a class a on full air ride, but then again, its a truck.....and thats one of the many things I like about it. I'm running down to Florida this weekend for a few days and plan of doing it loaded to the gills including the full fresh water tanks to see how it rides.
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Old 12-16-2008, 08:34 PM   #10
Texas TC
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On the 6331, I always run the fresh water tank full. Since this model has a very short overhang, it tends to add weight to the rear of the coach and improves the ride. Since this model has so much excess CCC, I keep the basements loaded and water tank loaded to try to compress the springs just as much as I can. Even loaded, I have over 4000# of CCC left. The extra CCC allows me to tow my Jeep Wrangler and not be even at the GVWR and no where close to the GCWR as advertised for the chassis.

It is very interesting that two 6400 coaches are so inconsistent in overall weight when my coach and other 6331's are almost identical on the scale.

Paul, do you have the breakdown for the front and rear axle weights on your 6400?



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