# Fz vertical forces

**URL:** <https://forums.ipg-automotive.com/t/fz-vertical-forces/214>\
**Category:** Vehicle Modelling\
**Created:** [29 March 2022 16:14 UTC](https://forums.ipg-automotive.com/t/fz-vertical-forces/214 "2022-03-29T16:14:00Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![FCS](https://forums.ipg-automotive.com/letter_avatar_proxy/v4/letter/f/4bbf92/32.png) [@FCS](https://forums.ipg-automotive.com/u/FCS)\
**Post date:** [18 November 2022 00:30 UTC](https://forums.ipg-automotive.com/t/fz-vertical-forces/214/2 "2022-11-18T00:30:34Z")

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Hi Peter, there is a quite good explanation from Mariano in this post that might help you

> [@How does Carmaker estimates longitudinal load transfer in each tire?](https://forums.ipg-automotive.com/t/how-does-carmaker-estimates-longitudinal-load-transfer-in-each-tire/343):
>
> Hi. I was trying to model longitudinal load transfers through mechanical equations and compare it with the values measured by Carmaker. My goal is to determine the total load of each rear tire, specially during straight acceleration runs, but preferably in any condition. Comparing my results (exporting it from simulink to IPGControl) with Car.FzRL and Car.FzRR I noticed they are a little different, that’s why I’d like to know how does CM estimate it. It can be seem in the following figure:

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