SF17-T Guidelines

1 Tyres

1.1 Pressures – When the tyres are up to working temperatures they should be about 25psi for optimum footprint and hence grip.

1.2 Temperatures – The tyres work perfectly within +/- 10 degrees of the optimum values which are:-

US – 100 degs, SS – 105 degs, S – 110 degs, M – 115 degs, H – 120 degs

1.3 Graining/blistering – The tyres are a cross between 2016 and 2017. Soft tyres will tend to blister more especially on long fast corners and abrasive tracks like Silverstone and Catalunya. The harder tyres will grain more, especially on Mickey Mouse tracks like Abu Dhabi.

1.4 Wear – The tyres start to go off more quickly (a “slippery slope” rather than a “cliff”) at 94%. All the compounds have this characteristic and the gaps between compounds in both performance and wear rates are evenly spread.

2 Fuel

The high revvers will need full fuel most races. Changing gear by the end of the “red” rev range, coast-braking, high engine-braking levels and even short-changing are ways of saving fuel.

3 Ride Height

The SF17-T is not particularly aero-sensitive, so lowering ride height only gives you a marginal increase in downforce. Also, if the front is set below 50mm the car starts to get very bumpy which has an adverse effect on both downforce & grip.

4 DRS

Will be allowed, but we will use the ACRL app in-race to catch anyone who uses it when over a second behind the guy in front. The best way to use this app in race is simply to always wait for the BEEP.

5 ERS Guide

5.1 MGU-K Deployment Modes

  • Charging – Only used to save charge before a qualifying hotlap
  • Bal Low – Low charge usage, best for tracks with short straights/lots of corners
  • Bal Hi – As Bal Low but uses more charge, like Bal Low more effective at lower speeds
  • Top Speed – Low charge usage, high speed tracks
  • Overtake – High charge usage, high speed tracks – it’s Top Speed on steroids
  • Hotlap – Balanced but high energy usage throughout rev/speed range

Qualifying – Use hotlap on most tracks, but Spa will run out of allowed charge by Stavelot using Hotlap or Overtake modes.

Race – if in doubt, use Top Speed throughout the race and a dab of the KERS button when necessary. For those who want to manage charge and get the most out of it:-

  • Hi speed tracks – Switch between Overtake and Top Speed (use Bal Hi/Low if Top Speed won’t recharge)
  • Medium speed tracks – Bal Hi, Overtake and Top Speed are probably the best (use Top Speed to recharge or Bal Low if that fails).
  • Low speed tracks – Manage between Bal Low and Bal Hi and even Hotlap (use Top Speed if Bal Low won’t recharge)

5.2 MGU-K Recovery (Levels 0 – 10) Low levels give more stability under braking, but most people can cope in the SF17-T with the higher levels 7-10. Hence, the recharging rate has been reduced from the original SF15T levels by around 20%. Level 10 is tricky in slow hairpins in particular, the car can easily get a bit “stuck”.

5.3 Engine Braking (Levels 0 – 13) This is a matter of preference. 13 gives you slightly better fuel consumption, but also makes the rear less stable when braking. However, it’s not that bad, so I think most will run with 10 – 13.

5.4 MGU-H Battery/Motor Mode Set this to “Motor” – end of, you should never need to use battery – one thing less to think about!