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Old 05-15-2013, 02:56 PM   #81
havok6927
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Originally Posted by asting View Post
That... is not how that works. RPM's should be unchanged, as that is determined by your gearing (and what gear you are in), not how tightly bolted down your engine is.
Actually with a weak motor mount and with a lot of up hill highways in the Northwest GA area it will help the motor not have to work as hard.
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Old 05-15-2013, 02:57 PM   #82
asting
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Actually with a weak motor mount and with a lot of up hill highways in the Northwest GA area it will help the motor not have to work as hard.
You're missing the point. Speed is what determines your RPM. Speed and gearing. Power determines whether it is feasible, it doesn't modify it.
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Old 05-15-2013, 03:04 PM   #83
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You're missing the point. Speed is what determines your RPM. Speed and gearing. Power determines whether it is feasible, it doesn't modify it.
That is where I have to correct you.... any car on a hill will be at higher rpm at the same speed as a flat road. A stronger RMM will help the motor not work as hard if the original RMM allows for a lot of flex. Suspension 101 buddy.
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Old 05-15-2013, 03:10 PM   #84
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Not to mention physics.
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Old 05-15-2013, 03:11 PM   #85
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That is where I have to correct you.... any car on a hill will be at higher rpm at the same speed as a flat road. A stronger RMM will help the motor not work as hard if the original RMM allows for a lot of flex. Suspension 101 buddy.
What?!
When not shifting and at a constant speed gearing is fixed! Meaning you didn't magically change your 5th gear ratio unless you swapped out your transmission or rear end. Might it require slightly less throttle? Perhaps, but a Rear motor mount will not affect drivetrain ratios.

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Not to mention physics.
I'd love to see your credentials on the matter, this is about as basic as it gets.

EDIT: Unless you mean you are leaving it in 5th gear, where as before 4th is needed, but that doesn't really coincide with your story either.
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Old 05-15-2013, 03:21 PM   #86
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That is where I have to correct you.... any car on a hill will be at higher rpm at the same speed as a flat road. A stronger RMM will help the motor not work as hard if the original RMM allows for a lot of flex. Suspension 101 buddy.
Wowzers..... That's not how this works at all. The term "RPM" is a measurement of revolutions around a fixed axis. If your drivetrain is remaining in a fixed condition (gear), your RPMs will not change based on engine load caused by outside factors.

All that a RMM would do for you in these circumstances is reduce lost energy due to excessive motion.

This also has nothing to do with the suspension of the vehicle.
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Old 05-15-2013, 03:28 PM   #87
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Wowzers..... That's not how this works at all. The term "RPM" is a measurement of revolutions around a fixed axis. If your drivetrain is remaining in a fixed condition (gear), your RPMs will not change based on engine load caused by outside factors.

All that a RMM would do for you in these circumstances is reduce drivetrain loss due to excessive motion.
Really?? Go take your car on a flat road in whatever gear you like, then the it on a hill in the same gear at the same speed and tell me your RPM's aren't higher...
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Old 05-15-2013, 03:29 PM   #88
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Really?? Go take your car on a flat road in whatever gear you like, then the it on a hill in the same gear at the same speed and tell me your RPM's aren't higher...
They aren't higher...
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Old 05-15-2013, 03:31 PM   #89
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I know gearing ratios are fixed but there are other factors that will affect how high your RPM's are in certain conditions.
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Old 05-15-2013, 03:32 PM   #90
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I know gearing ratios are fixed but there are other factors that will affect how high your RPM's are in certain conditions.
No, there are other factors which will determine engine load... but RPMS remain constant.
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