Please is it me or can anyone else feel the difference between freeplay and rivals and multiplayer. I tune a car, tweak it until really happy with it then save and share the tune. I then take the car to Rivals, same track and the car is different. The car I just tuned was on rails and getting quick times in freeplay and on rivals it was 1/2 sec slower. The back end kept on letting go. Why is it so different? Any ideas. Would be nice if someone from Turn 10 would respond. Its not just this car, it happens so often.
It appends to me today but I was faster in rival make a 1% time and then with the same car and tune and track I was slower in freeplay. I think we are humains not machines.
I’m guessing the answer is yes, but are you sure it was your tune running? In many Rivals you can’t use tunes at all. Maybe it’s just me being ham fisted and clueless, but when I can run my tunes in Rivals, they seem to work as they do in Free Play or Career.
I find when you load into tracks that has different time of day. The cars will handle differently.
Time of day can have an effect on the handling, however what I find as the biggest contributing factor is pressure! In Freeplay there is no pressure turn by turn, only the clock/timer. When you jump into Rivals and you are chasing someone who is faster, you add in the pressure to catch them. You start pushing your vehicle harder with late braking corner entries and trying to get back in the throttle to soon or too much on corner exit. Tires are overheating but you continue to push and catch them…
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yep, cars do handle different, in different modes.
lots of people will say differently,
but people who spend a lot of time tuning, will know of this annoying feature.
they have also changed grip values, with the last few updates, by very small amounts.
95% of people wont notice, but you can notice the change if you drive in X class most of the time.
ive got tunes that were once good, then got 2 seconds slower a lap, and are now good again, with the updates…
i love forza
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It is frustrating, spend quite along time tweaking the tune for private leagues and then the car handles different. Sometimes to the point of why bother…
100% agree. I notice this in P class also. Grip levels also seem to randomly change on different laps and I do not mean due to tyre temps.
Often my fastest times whether testing in free play or in rivals will be lap 8, 12, 20. Sometimes this changes but there is a noticeable increase in grip on some laps. Also feedback through the controller seams to change day to day. This happens online and offline so not a connection thing.
I no longer assesss tunes against previous days tunes / times. . I rerun a basetime lap in that session and then assess new tune tweaks against that. This also removes human issues such as tiredness, time of day, alcohol consumption etc. Which is a big factor in my lap times. 
I noticed this quite early on. My fastest laps tend to be lap 8 (or multiple of 8) or end in an 8, so in a 30 lap race it would probably be 28.
LOL … its been this way since the first forza … there are many factors for this … one is Turn 10 constantly makes very small physics tweeks to the game … they only generally announce the largest ones (like that of weighting)… server response time back to your machine is another of the largest factors. Generally, I soft tune off line and then finish the tune on line for final adjustments.