I began simracing with aliens in GPL so the first thing I learned was how to be a good backmarker and then racecraft. If a driver finds him or herself 1.5s off the pace in fast open-wheelers, or 2s or more in GTs or slower open-wheelers, then that person should know to regularly be checking their mirrors.

If they're in the middle of a pack where they know they "don't belong," they first of all shouldn't overdo their driving. Once they find themselves further into the race or have had a skirmish with the grass or walls and lost a lot of time early on, they should keep an eye out on the little timing screen that shows leader lap or gap, and check mirrors every single straight, and double check before getting close to their braking points. Once a car is visible they should work out how quickly that car has appeared because all it takes sometimes is one chicane for that car to be all over their rears, or about to pass.

When that is the case and the gap is maybe of 1s or just a bit more, the best is to coast off the throttle and stick to your line. Never ever brake. The lapping car will be far enough away to notice the rate of approximation and just easily move over and pass, without being on the dirty line for braking or having to fight for a corner that is rightfully his. If you have keys mapped, it's the perfect time to say "Pass right" or use your microphone.

The more challenging a car is to handle, the worse it will be when it comes to corners or twisty sections. Very often the backmarker can lose control and have a twitch. Often times the cornering speed difference and lines are so great, the lapping car can find itself in trouble from simply getting too close but instead of being able to drive, being forced to be in a position of react first, drive second. And that leads to problems too. As careful as a lapping driver may be, the situation may still arise that the drivers will have issues due to sheer speed differences - and they can be massive on corners.

A last bit of a note and tip I've always tried giving is, don't go off the track. You can lose control and you lose even more speed, and following cars may come close to you much sooner than expected. Being on the outside of a corner, you can go very wide and tip-toe back to the line or finish the corner once the cars are through.

Nice post
Got this one sussed managed to get in way of Julian allot when i first started in BES series.
classic one i was trying to setup my pit stop and did not see him till to late nearly ruined his and my race.
I felt really bad about it. So bit more nervous than others lol
my dash flashes blue and crew chief is there to keep an eye out for me now
Generally pull over so they can pass. will do the pull to left so they take inside line up to corner now
 But hopefully i wont be lapped now