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Changes to LMP2 in January 14 Build

All P2 drivers: there are significant changes coming to the Dallara P217 in the January 14 build. Please review these notes from Christian Challiner of iRacing:


In the 14/01/2021 patch the LMP2 will receive a few changes, we understand that these are quite close to the Daytona 24h and that a lot of you have already been working on setups. Because of this, we'd like to give you a heads up on what these changes are, what they mean and what you will need to do to 'fix' your existing setups as well as take advantage of the changes we have made.

So what are the changes?

- Power has been reduced by 40 hp (-6.66% reduction relative to 2020 specification). This is to match the car to the 2021 regulation change for LMP2's globally.

- Tyre warmer temperatures have been increased. This change reduces the time taken to bring the tyres up to operating temperature. You will find that out laps are now significantly less frightening.

- Camber limits have been revised to better match real world limits. Front and rear camber limits are now -2.9 (front) and -1.9 (rear). This will be the change that has the most impact upon your setups if you are running higher cambers.If you're only skim reading this post and want to know how to account for this, see the last few paragraphs.

- Two new adjustments have been added to the garage screen, 'Pushrod Length' and 'Third Pin Length'. These require more detailed explanation so I will talk about them individually, though functionally they are similar.

Pushrod Length

This adjustment will allow you to change the ride height of the car independently of the spring perch options at either end of the car. However, when adjusted in conjunction with the spring perch offset this also shifts your ratio of bump/rebound damper travel. What this means is that you now have greater control over when you will either top out the shock (this should ALWAYS be avoided) or when you contact the bump stop that is at the end of each corner dampers travel.

Ok so how do I use this to my advantage? Why would we want this?

Allowing users to alter the bump stop engagement means that you can 'time' when you land on the bump stop and means that you can use the bump stop to achieve greater ride height control.

In practice, this will allow for the use of softer third spring rates without track contact which results in greater straightaway speeds at tracks such as Daytona while improving corner exit traction through the use of softer spring rates. I have adjusted the iRacing Daytona baseline setup to give you an idea of how this can be utilised.

This setup now runs softer front and rear third springs (which is good for the low speed infield) without excessively scraping the racetrack on the banked sections since the right side bump stops are engaged and holding the car off the track surface.