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Old 08-06-2015, 01:18 PM   #21
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Originally Posted by Famousinternetjesus View Post
I appreciate your concern for safety etc, however, I have no reason to believe that with proper gearing I couldnt cruise at 80. I've got six new tires, The engine runs like a top and my alignment/steering are impeccable. If I could drop my rpms by 500 or so maybe a little more I could hit 75-80. I looking f
Even new truck tires, unless you shuck out BIG $$$$, are not intended to drive over rough roads at 80 mph. High quality semi tires (like Michelin, Goodyear, et. al.) are intended for Interstate Highways for high speeds. Even then those roads are not always in the best of condition. Some states and local municipalities have the big $$$ to keep up their roads. However, those places are few and far between in this economy. I'm concerned driving over 75 with my pick-up truck. We've recently had to rent a car for almost two weeks and I'm TERRIFIED with that P.O.S. doing 70.

As I said earlier, drive for your brakes, your engine, and now include driving for the road and its condition. I'd think loooooong and hard before trying to do 80 in a converted school bus. Better to get there alive than not at all.

Just my opinion.

M1031
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Old 08-06-2015, 03:14 PM   #22
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One more item to check/verify regarding tires...

The "V Rating"

(V = Velocity...Speed) The last character in the tires ID sequence.

All tires have a V rating which should never be exceeded. It can vary from tractor tires to formula racing tires (I used to race formula motorcycles and after some mods had to upgrade my tires to today's equivalent of a Z rating).

Many school bus tires are only rated to 62 or 68 mph. That is precisely the reason most techs will not re-program Allison 5 speeds to pick up 6th gear on a Skoolie. The vehicle would then exceed the factory tire rating.

See the current ratings here...

Tire Speed Ratings | Tire Speed Rating Chart | Discount Tire
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Old 08-06-2015, 03:15 PM   #23
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I understand all that and what you're saying is legitimate. I knew I was gonna catch a lot of negative responses with this because it's kid of crazy. Once I get videos up showing how pristine this bus is, zero rust, and mechanically perfect. I used to hit 75 in it with the old G159 tires on it but i think my new tires are a hair smaller making it hard to get up there. The bus is smooth and vibration free, purring at 65. I know lots of guys are thinking I'm an idiot. But just imagine being able to pop you at545 into "overdrive mode" and cruise at 75 at 2700-2800 rpm. Anyone that's driven cross country in three days like I have repeatedly knows this sound like heaven. I guess I'm just looking for that next gear haha
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Old 08-06-2015, 03:18 PM   #24
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Oh yeah and my tires are RV tires designed for high speed use ad they are brand new, they cost exactly one arm and one and a half legs
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Old 08-06-2015, 03:20 PM   #25
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Not me. I'm just always surprised at how few people are even aware their tires HAVE a speed rating.
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Old 08-06-2015, 03:27 PM   #26
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Yeah the wrong tire is veeeeery dangerous. That's why I bit the bullet and replaced mine, the G159 was only rated to 65 and was known to have a history of critical tread separations/failure yikes!! Not something I wanna deal with in a 13000 pound vehicle hence the pursed to tires rated to 85
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Old 08-06-2015, 03:28 PM   #27
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*upgrade not pursed haha damn auto correct
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Old 08-06-2015, 04:41 PM   #28
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So does anyone in fact manufacture an overdrive unit for the Allison at545?
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Old 08-06-2015, 05:06 PM   #29
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No, none that I'm aware of. The problem with going faster in any HD vehicle is the aeration of the gear oil and subsequently burning them up. They weren't designed to go that fast. Another thing you have to look at is the critical speed of the driveshaft, and make sure you don't exceed that. OD is essentially made to shift into at highway speed and just cruise at, not as an alternative to make the bus go faster. Change your rear gear if you want a higher top speed.
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Old 08-06-2015, 07:20 PM   #30
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Quote:
Originally Posted by Famousinternetjesus View Post
Will the MD3060 mate up with the 6.9
Quote:
Originally Posted by Famousinternetjesus View Post
So does anyone in fact manufacture an overdrive unit for the Allison at545?
IMO

Famousinternetjesus
Don't take this the wrong way, but read and under stand the next few sentences.

You need to lean how to press the "search" button, and press the "post" button less.

Search MDT trucks of the same year range as your bus.

Most of the searching you you need to do now, should have been done before you bought a bus.

That 6.9 is one of the worst engines you could have picked.

Nat
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