Dude, FAST ain't got nothing to with racing!
The main thing is that you be clean and respectful. Being fast comes with lots and lots and lots of laps in many many many different types of cars.
I ain't the fastest guy, but I try to avoid trouble and it usually works out pretty good in the end.
Being fast is for your ego only...

If you don't mind finishing at the end of the pack and can be clean while doing it, then I say, stick with it buddy.👍
Ok let me rephrase that:
1) Run
fast smart and clean with moderately fast GT1 cars.
2) Run
fast smart and clean with moderately fast GT2 cars.
3) Be able to drive in a mix of the two.
I have no problem racing with folks who are still learning OLR, just as long as they aren't constantly lawnmowing, bulldozing, wall-painting, and blindly re-entering the track after beachcombing. (<-
Banzai Driving?)
If you can't do a solid 5 laps (I always make sure I can do at least 10-15 with varying degrees of pace) without spinning or totally wiping out in practice, let someone from the reserve list take your place. Doesn't matter if you're 5-10 seconds off the pace, heck I enjoy passing slow cars

, just drive
smart, and
prepare your race. I learned more about OLR participating in my first 2 GTP series races than I could ever learn just regular Public Room racing.
I must admit, on some tracks I myself am still slow or beachcomb a few times (my RL achille's heal), but I wait for cars to pass before re-entering the track. I would expect everyone knows how to do that.
From the posted best-lap times, everyone is well within 5 seconds, and Ruta well that's not so bad, just make sure you prepare your race or let a reserve driver race for your team.
Passing
It has been stated that GT2 cars are to hold their line, but I would expect that in the straight, the GT2 car could make enough room for a GT1 car to draft pass them.
As for corner passing, and this goes for
any class combination:
online racing rules apply! Make sure you have fully read and understood these rules!
Re: Section 08A
08: Corner Rights:A:
When approaching the turn/apex of turn, the car which "holds" the inner side of turn has entrance-advantage and other driver(s) must refrain from endangering him by his actions.
This means, if you are passed before a corner/turn, be prepared to break early. If you are the lead car, you should still try to make sure you have enough room to setup your turn even if the passed car doesn't yield.
This will be one of the most strictly enforced rules. If you cause a driver to go off-track or lose position on you when you loose right-of-way, you
MUST slow down and let them pass within
1 lap or a penalty will apply. If the victim simply is inconvenienced and keeps driving, the offender will be issued a warning.
On a lighter note: I'm really starting to prefer the Zed LM. It better fits my driving style (she's easier to manhandle), but I never tried her out until last week. Took almost 3 seconds of my best GTR LM time on Nurb/F in less than 10 laps (duh, coming from a NismoZ fan, I should have figured this out long ago...)