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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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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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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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Old 05-02-2017, 08:51 AM   #11
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Plus, I don't want it to rev higher...
What do you think you're going to change inside the governor housing then?
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Old 05-02-2017, 09:37 AM   #12
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it sounds to me like with 6.50 gears this bus is limited by RPM's not necessarily turning up the power, its not computerized so there isnt an easy computer program to remove.

by turning up the RPMs on an engine that has lived its whole long life at a certain RPM you run the risk of breaking it. rotasting components stretch as they spin... higher RPM could cause the rings to ride into the cylinder ridge, bearings have more pressure than previous, are your valve springs up to the task of higher RPMs?

im all about methodically modding the heck out of drivetrains but study up first and learn what you are doing before you just turn the screws..
-Christopher
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Old 05-02-2017, 09:57 AM   #13
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As obsolete as those engines are becoming, I'd try to keep it running as long as possible.
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Old 05-02-2017, 10:12 AM   #14
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ultimately its going to come down to rear gears or transmission to make that bus go faster reliably..

6.50s are pretty short. that thing probably gets up to top speed right quick though!
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Old 05-02-2017, 10:16 AM   #15
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I'd think a set of 4.44's would be a nice upgrade. Possibly some taller rear tires, if possible.
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Old 05-02-2017, 12:20 PM   #16
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Hi all, I will jump on here to give what I have.

I have an 86 BB flat nose, 16 window I think. It is the longest bus they made that year. I can hit a top speed of 64mph. I have the 8.2 DD also with an automatic. I do not know the gear ratio as I have not had a need to go much faster.

I do run 22.5 tires and the 64 is flat out and the motor is loud. The motor is stock. The only changes that are done to it is I run a straight 4" pipe no muffler and because I have an oil distribution company I run the oil I distribute. Now the straight pipe probably didn't do much as I ran that for 2 years before I got into the oil. I was 62mph and 8.2 on average for fuel. With oil I am now able to go 64mph, my last trip was just under 11mpg and that was going through the mountains of VA and WV and all the hills in NC and lower Ohio. The oil consumption is about half what it was before too.

I am not here to sell the oil, I will but not making a pitch. Just letting you know what I have for comparison.

If you are interested in the oil PM me and I will make a post on it.
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Old 05-02-2017, 12:41 PM   #17
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How can a brand of oil give a vehicle more speed?
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Old 05-02-2017, 12:48 PM   #18
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Quote:
Originally Posted by EastCoastCB View Post
How can a brand of oil give a vehicle more speed?
Maybe it induces less drag on the rotating assembly and let's the engine spin up an extra 100 rpm?

One of the key selling points of snake oil.
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Old 05-02-2017, 12:52 PM   #19
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How can a brand of oil give a vehicle more speed?
The easiest way to explain it the engine doesn't work as hard to turn itself over. it also keeps the turbo cooler.

Thus the engine is more efficient, the better gas mileage and the MPH pick up is there.
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Old 05-02-2017, 12:54 PM   #20
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Maybe it induces less drag on the rotating assembly and let's the engine spin up an extra 100 rpm?

One of the key selling points of snake oil.

Call it what you want we have the data to back it.

I am also not here to debate the merits of this the oil. we can do that on a different thread but you can not out run technology.
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