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Old 01-02-2013, 11:00 PM   #1
Mini-Skoolie
 
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Cat 3126 governor

Does anybody know how to get rid of the governor on a Cat 3126 engine. The bus seems to not have enough power, and it tops out at 55-60 mph. I talked to a bus driver, and he said that they have governors on them.
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Old 01-03-2013, 11:41 AM   #2
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Re: Cat 3126 governor

You should be looking more at your rpm's and rear gear ratio. Where are the rpm's when it tops out?
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Old 01-11-2013, 09:40 PM   #3
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Re: Cat 3126 governor

I have no idea what the RPMs are, my dad drove it home cause he has a CDL A. He said he had it to the floor, and it topped out at like 55 mph. Is there anyway to make it go any faster. I would like to go at least 65, to go the speed limit on the interstate. I thought about changing the rear gear ratio, but thats expensive and time consuming.
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Old 01-11-2013, 09:52 PM   #4
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Re: Cat 3126 governor

A wild guess, the answer is no. Its more than likely governing out at its specified rpm, which is what you want. I cant suggest anything until you find out what rpm its turning at top speed...sorry.
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Old 01-11-2013, 11:26 PM   #5
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Re: Cat 3126

The Cat 3126 engine is not a very powerful engine and does not make high horsepower. The govenor is to control engine operating conditions to about 2250 RPM. The top speed is determined by the rear axle gears. The higher the ratio, the lower the top speed. To determine the rear axle ratio, raise one side of the bus so the wheel may be turned. The park brake needs to be released so the wheel can be turned. With a chalk or marker, place a mark on the raised wheel pointing at the earth under wheel. Make another mark on the driveline about 6 inches long near the rear ujoint, horizonal. Turn the raised wheel slowly while watching the driveline mark. When the wheel makes a single revolution, the driveline turns should be remembered.
Many buses and trucks have a 5:1 gear ratio. A good ratio for hiways is 3:73 down to 4:10. Most rear gears can be changed to satisfy any application.... Frank
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Old 01-11-2013, 11:51 PM   #6
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Re: Cat 3126 governor

How much would it cost to change the rear end ratio. I know that it wont be cheep. Also would it be possible to do it on my own, or should i take it somewhere to have it done. Would a programer such as this one from TS performance be a good upgrade? http://www.tsperformance.com/MPHD_tuck.html
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Old 01-12-2013, 09:53 AM   #7
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Re: Cat 3126 governor

The 3126 is an electronically controlled engine. It can have a vehicle speed governor programmed into it. The only way to know for sure is to take it to a Cat service center and have them hook it to a computer and look.
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Old 01-13-2013, 07:53 PM   #8
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Re: Cat 3126

Quote:
Originally Posted by frank-id
The Cat 3126 engine is not a very powerful engine and does not make high horsepower. The govenor is to control engine operating conditions to about 2250 RPM. The top speed is determined by the rear axle gears. The higher the ratio, the lower the top speed. To determine the rear axle ratio, raise one side of the bus so the wheel may be turned. The park brake needs to be released so the wheel can be turned. With a chalk or marker, place a mark on the raised wheel pointing at the earth under wheel. Make another mark on the driveline about 6 inches long near the rear ujoint, horizonal. Turn the raised wheel slowly while watching the driveline mark. When the wheel makes a single revolution, the driveline turns should be remembered.
Many buses and trucks have a 5:1 gear ratio. A good ratio for hiways is 3:73 down to 4:10. Most rear gears can be changed to satisfy any application.... Frank
I have seen 7.2 Cats running 330HP in RV's and 275 in trucks. The one I drive every day is 250HP, power peak is 2200, governor is 2600. A 7.2 Cat with no OD trans and fullsized 22.5" truck tires wants a 4.11 axle gear...maybe 4.30's if it's really low-power.
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Old 01-15-2013, 05:41 AM   #9
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Re: Cat 3126 governor

agree with last post.
axle or pot should be changed out is my guess as many of the newer ones are geared to go no more than 60 mph. If bus is a pusher, conventional axle can be installed if flipped and plug holes changed...
My 3208 Cat is underpowered in the rocky mountains, esp when full of car parts and towing box trailer with same...
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Old 02-20-2013, 09:10 PM   #10
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Re: Cat 3126 governor

Quote:
Originally Posted by superdad
The 3126 is an electronically controlled engine. It can have a vehicle speed governor programmed into it. The only way to know for sure is to take it to a Cat service center and have them hook it to a computer and look.
I spoke to the head maintenance guy at the nc school bus supply today, and state law in nc is that all school buses be governed at 45mph. He said to bypass this take it to CAT to be reprogrammed as stated above. I'd lose my mind going 45 everywhere lol
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