Additional weight and re gear

[Choobys]

I’m seeing charts on tire size and gears. But what about re gearing due to just additional weight. Is there a chart out there?

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[AnnDee4444]

I'll take a shot at this. The chart below shows the maximum axle torque/pound of vehicle weight. This does not take into account tire diameter/weight or drivetrain losses.

I've based this off of a 2.0 auto. Other engine & transmission combination sill have different numbers, but somewhat similar results.

So to make sense of this, a stock 4500 pound Rubicon has 1.27 lb.ft. of torque / pound of vehicle. Increase the weight to 5000 pounds, and 4.56 gears would give about the same axle torque/weight.

 

[Choobys]

I'll take a shot at this. The chart below shows the maximum axle torque/pound of vehicle weight. This does not take into account tire diameter/weight or drivetrain losses.

I've based this off of a 2.0 auto. Other engine & transmission combination sill have different numbers, but somewhat similar results.

So to make sense of this, a stock 4500 pound Rubicon has 1.27 lb.ft. of torque / pound of vehicle. Increase the weight to 5000 pounds, and 4.56 gears would give about the same axle torque/weight.

This is a great lead! where did you get the chart?

 

[AnnDee4444]

This is a great lead! where did you get the chart?

I made it in Google Sheets.

 

[Choobys]

I made it in Google Sheets.

What is the equation? I’d like to do it for my 3.6

 

[AnnDee4444]

What is the equation? I’d like to do it for my 3.6

axle ratio x first gear ratio x engine torque / vehicle weight

Here's what it looks like for a 3.6 automatic:

 

[AnnDee4444]

Keep in mind that these are only maximum torque values, and shouldn't be used to compare engines.

 

[AnnDee4444]

Here's a 3.6 manual. I wouldn't use this to compare transmissions either, as the torque converter was not figured into the equation.

 

[Choobys]

Keep in mind that these are only maximum torque values, and shouldn't be used to compare engines.

Thank you for all your help!

 

[intentsrig]

Cool!

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