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Old 04-27-2017, 10:42 PM   #1
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8.2 Detroit Speed Limiter

I've been reading up on the 8.2 and the governor and fuel system. I'm not having much luck though. My bus will not go over 55 mph. I believe that it could, but something is stopping it. Anyone messed with this or be able to point me in the right direction?
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Old 04-30-2017, 07:51 AM   #2
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Old 04-30-2017, 08:01 AM   #3
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Quote:
Originally Posted by tlbeck1985 View Post
I've been reading up on the 8.2 and the governor and fuel system. I'm not having much luck though. My bus will not go over 55 mph. I believe that it could, but something is stopping it. Anyone messed with this or be able to point me in the right direction?
whats your rear axle ratio?
what rpm are you at when going max speed?
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Old 04-30-2017, 02:12 PM   #4
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I have the 8.2 mechanical and I have researched trying to adjust the governor many times and always run into the ones that say it can't be adjusted.
For longevity of my 175 hp 8.2 I have accepted the fact.
So my solutions to get my bus from its 49mph to at least 55mph are to
Change from 20" tires to 22.5" tires
And change the rear gears from 6.50 to????
Right now I can pull a trailer a car or a tree stump just not faster than 49.
If I change gears then I gain highway speed but lose towing capacity.
But I also have to take into account the capacity of my AT545 tranny and its happy RPM range before I can choose the proper rear gear for me.
Good luck
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Old 04-30-2017, 03:18 PM   #5
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Your 6.50 rear is the reason why you can't go faster, your engine has a 2700 rpm recline (approximately) so you need like a 4.44 rear if you want to go 65 mph
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Old 04-30-2017, 04:33 PM   #6
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Quote:
Originally Posted by EastCoastCB View Post
whats your rear axle ratio?
what rpm are you at when going max speed?
I'll have to check on the axle ratio. I don't have a tach, but it's pretty low rpm.
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Old 04-30-2017, 04:34 PM   #7
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Quote:
Originally Posted by Jolly Roger View Post
I have the 8.2 mechanical and I have researched trying to adjust the governor many times and always run into the ones that say it can't be adjusted.
For longevity of my 175 hp 8.2 I have accepted the fact.
So my solutions to get my bus from its 49mph to at least 55mph are to
Change from 20" tires to 22.5" tires
And change the rear gears from 6.50 to????
Right now I can pull a trailer a car or a tree stump just not faster than 49.
If I change gears then I gain highway speed but lose towing capacity.
But I also have to take into account the capacity of my AT545 tranny and its happy RPM range before I can choose the proper rear gear for me.
Good luck
I figured it out from that old school video. It comes with shims in it from the factory. You can remove the shims in the governor to increase top speed. I'm going to do it, I'll make a video when I do.
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Old 05-01-2017, 09:08 AM   #8
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Get a tach. And figure out what rpm you're at. Then do the calculations and go from there. Make sure you have a 6.50 rear gear. Things can be changed from when it left the factory so don't assume.

My thoughts are that if you have to ask what to do inside the governor housing to get it to rev higher, that you're not familiar enough with it to be messing with it.
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Old 05-01-2017, 05:10 PM   #9
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Haha, that isn't gonna stop me.
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Old 05-02-2017, 05:23 AM   #10
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Plus, I don't want it to rev higher...
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