Time trial is usually a very good mode to gain consistency. It forces you to be smooth and clean with the car without risking in every corner. Ttrating has no real meaning for me but sometimes I asked how this work. Many people asked same as well. Here is the current Sporting Code explanation and an old iRacing staff notes by Shannon Whitmore.
A Time Trial is a competition between you and the clock (and everyone else and the clock!) You are on track alone and must try to record the fastest sequence of laps without spinning, going off the track, or having contact with a barrier. Any such incident will invalidate your current lap sequence, and you will need to complete another full sequence in order to better your time. The Time Trial time is your average lap time for your best sequence of laps in the session. The number of laps in a full sequence varies from track to track, or from configuration to configuration.
What is an official time trial? Official means you completed the required number of consecutive incident free laps during a time trial session. For example, Mazda Raceway at Laguna Seca requires four consecutive incident free laps.
Essentially, you get a session rating at a track each time you complete a time trial. This session rating depends on your time trial time compared to the time trial record for that car at that track.
Your last four time trial session ratings at a given track regardless of car are averaged to get your rating for that track. For each car you time trial at a track, you’re given a normalized number, and that number is reflected by a rating, for example 1600. Why doesn’t it matter which car? Because within the formula, being x.xxx off the record in a Rookie Solstice can be equated to being x.xxx off the FSB2000 record.
Your track rating from your 8 most recently visited tracks are averaged to give your overall time trial rating.
What if you haven’t time trialed at 8 tracks? What happens here, is that you’re given the service wide average rating for the remaining tracks. So the table shows Driver A having time trialed at 4 tracks, leaving him 4 tracks at which he is getting the service average rating, for example, let’s say the avg is 1600 for all other tracks.
Once you have time trialed at 8 tracks, your overall rating is more correct, because now you have 8 real ratings for 8 tracks, no service average ratings are included. Once you complete a time trial on a 9th track, only the 8 most recent are used, so in this case your first track would be dropped from the average.
Having the best time trial or being at the top percentile of the standings for a given week or track doesn’t necessarily equate to a positive gain in ttRating points.
See you on the track!
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I don't understand how the TT average is counted. I am new to the sim and am trying to understand. I just completed a TT at Richmond in a modified SK. I am working on consistency and trying to increase SR for license promotion. I ran 49 laps with a best lap of 23.584 and an average of 24.127. What I don't get is all 10 of my purple laps were under 24.000. How can that be? I thought it was to be the average of the counted laps, but it is not. Most of my later laps were in the low 24s and high 23s. So, how is the average calculated. It got best lap correct, but no idea where the average comes from. Does average count for anything?
My advice is just race and don't worry about TT too much. It is almost marginal to the global experience and hard to understand. Number of laps to be counted shows in F1 blackbox and take your best average of the whole counted laps.