How to calculate and define a proper differential ratio

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Lioner110
Posts: 19
Joined: 05 Aug 2023 13:23

Re: How to calculate and define a proper differential ratio

#11 Post by Lioner110 » 06 Mar 2025 18:23

I'm sorry, maybe I didn't understand it somehow.
But is it possible to calculate the limits of the NM peak zone and maximum speed based on the known engine speeds in the game and the transmission?
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PikPikker
Posts: 777
Joined: 16 Jun 2015 07:32
Location: Driver's Seat

Re: How to calculate and define a proper differential ratio

#12 Post by PikPikker » 07 Mar 2025 02:44

One simple lifehack I got with RPM.

If you use 315/70 tires, 6.5 differential ratio and direct (1.0) gear, you will be running 1000 RPM at 30 kmh. Very approximate but might be useful.

Next calculations may be done with multiplications: 3.25 diff 1.0 gear = 1000 RPM at 60 kmh, and 2000 RPM at 120 kmh.

Just keep in mind it's all linear. You can also calculate such for each gear, diff_ratio*gear_ratio=reduction. It's all the same reduction where I said 6.5 reduction = 30 kmh at 1000 RPM.
Lioner110
Posts: 19
Joined: 05 Aug 2023 13:23

Re: How to calculate and define a proper differential ratio

#13 Post by Lioner110 » 07 Mar 2025 06:07

Got it, thanks.
There are still no better practical tests.
It's just that electric trucks will be introduced here sometime.
And you can't read the instrument readings there.
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PikPikker
Posts: 777
Joined: 16 Jun 2015 07:32
Location: Driver's Seat

Re: How to calculate and define a proper differential ratio

#14 Post by PikPikker » 07 Mar 2025 06:48

Why not? They have all the same RPMs and reductions too - calculate them exactly the same way.
Lioner110
Posts: 19
Joined: 05 Aug 2023 13:23

Re: How to calculate and define a proper differential ratio

#15 Post by Lioner110 » 07 Mar 2025 08:24

Thank you for your reply.

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