automatic D150 Governor swap
#2998728
12/26/21 10:44 PM
12/26/21 10:44 PM
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Joined: Nov 2018
Posts: 22 NC
psg
OP
member
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OP
member
Joined: Nov 2018
Posts: 22
NC
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Has any changed (elevated) the shift points by changing the governor? I don't understand the rpm listings on the available governors and what it means for my stock transmission tied to a new and very improved 360cid. I understand it can be accomplished with the trans in the car. tnx. psg
Faith in every footstep, faith in every mile
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Re: automatic D150 Governor swap
[Re: psg]
#3003579
01/09/22 08:21 PM
01/09/22 08:21 PM
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Joined: Jan 2003
Posts: 11,894 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 11,894
Benton, IL.
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What do you not understand about the RPM targets of the governors? There are 7 different ones that go from 5,000 to 6,000+ RPM. The biggest issue with changing governors is that a shift split will usually come along, too. In other words, the 1-2 will happen at a slightly different RPM than the 2-3. The spread will be greater with increased line pressure and also increases with each higher shifting governor. This can be somewhat corrected with A&A's spring kit. BUT! They are not exact and require the valve body to be removed and disassembled to install them. It can take several tries to get as close as possible, but often will never be exact and can even change with fluid temp.
What RPM are you going for?
Master, again and still
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Re: automatic D150 Governor swap
[Re: psg]
#3003855
01/10/22 03:59 PM
01/10/22 03:59 PM
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Joined: Mar 2011
Posts: 3,056 Michigan
A727Tflite
master
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master
Joined: Mar 2011
Posts: 3,056
Michigan
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Has any changed (elevated) the shift points by changing the governor? I don't understand the rpm listings on the available governors and what it means for my stock transmission tied to a new and very improved 360cid. I understand it can be accomplished with the trans in the car. tnx. psg The listed shift points are only the ones that have been “worked” out using a combination of inner and outer weights, gov. springs, etc. There are infinite shifts points based on several factors if you want to experiment on your own.
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Re: automatic D150 Governor swap
[Re: TJP]
#3004374
01/11/22 10:54 PM
01/11/22 10:54 PM
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Joined: Jan 2003
Posts: 11,894 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 11,894
Benton, IL.
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Going that route changes the line pressure and will change the part throttle shift point, too. So, when you get the WOT shift where you want it, then you are stuck with whatever part throttle shifts that it ends up with. And they are usually uncomfortably high (and hard) on a street car.
The only way to raise the WOT shift points AND maintain some control over the part throttle shifts is with governor kits. Of course, as mentioned, there is always the manual valve body. That is what I run today in my street Hemi car due to it's 6,800 shift point.
I will throw this in: When I raced KOS with the wedge, it wanted shifted at just over 6,000. I fought the split shifts for a long time, never getting them consistent no matter what I tried. I could get one or the other where it needed to be (most of the time) but not both. The best compromise I could come up with was to get the 1-2 shift where I wanted with the governor and to make the 2-3 shift earlier with the springs. That way I would launch with the selector in 2nd. It launched in low, went to second on time and hold there until I selected third. That way I could concentrate on the launch and the launch only, then have time to deal with manually shifting into high.
With low gears when running the 1/8, lots of things happen really, really fast in that first couple of seconds. Being able to depend on that first shift to automatically happen was a real advantage. At least to this guy.
Master, again and still
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Re: automatic D150 Governor swap
[Re: volaredon]
#3004733
01/12/22 09:04 PM
01/12/22 09:04 PM
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Joined: Mar 2011
Posts: 3,056 Michigan
A727Tflite
master
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master
Joined: Mar 2011
Posts: 3,056
Michigan
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So the governor within a given trans, wouldn't be the same as any other of the same model trans? I mean a governor from any 904 be the same as any other 904 at least for a few years? The governor is usually matched to the engine and vehicle combination. A full size van with a 318 would likely get a trans with a different governor than a 400. Not only does the governor allow automatic shifts tailored to the torque curve of the engine it also protects the engine at WOT in Drive.
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