here's a few Indoor karting tips I've figured out:

Take it easy the first time out. Most people are surprised with just how slippery the track is. Some tracks may have more grip then others, but in general, if you start taking it easy and build up speed slowly lap by lap, you will learn faster then driving like a maniac every second.

The first thing to work on is finding the line, don't worry about really pushing the cornering speed or braking. Watch the line the fast guys take. If someone passes you, try to pickup from their line. This is the first step towards being fast and you will pick up a big chunk of time being on the right line vs off. This is compounded on a lot of tracks that have significantly more grip on line. Many indoor tracks have a polished surface that is more worn in on the line.

After you feel comfortable with the line, work on cornering speed. A lot of times when cornering, you want to be in a slight slide but not too much - a lot of times the slip angle is very slight so it's barely noticeable. The exact amount varies and how to describe the feel is difficult; but if you slide too much, you will loose momentum, don't slide at all and you might not be pushing hard enough. Watch the fast guys hands and see what steering inputs they are using. There is a saying somewhere along the lines of - the less steering you do the faster you go.

Keeping up momentum is a big key. Keep in mind the karts don't accelerate very fast. The small four stroke engines used in most indoor karts don't rev up as fast as a comparable 2 stroke engine, and the karts beefed up for rental use and significantly heavier then a pure racing kart.

Emphasize exit speed over entry speed, particularly on corners leading onto long straights. A better exit will mean you'll be faster down the straight. It will also make passing easier. Don't be sliding significantly on corner exit!

Don't worry too much about braking when you're still focusing on finding the line and cornering. Since indoor tracks are short and tight and the karts aren't too fast, braking is not that important in indoor karting. Many corners can be taken flat or breathing the throttle if taken correctly. That's not to say braking doesn't matter at all. Mastering braking could be what it takes to get you the final few tenths and will help your ability to pass other karts. To start, where you need to brake, just straight line brake first. Braking entering a corner induces significant oversteer and things happen very quickly in karts. When you start getting a feel for it, you might want to trail the brakes a bit to help the kart rotate on entry. Also keep in mind the karts only have rear brakes. Never get on the brakes mid corner or after, that will be an insta-spin!

Look ahead! Although you aren't going that fast, the tracks are so small and tight that things happen pretty quickly! Look ahead for where you want to apex as soon as you can. You might be able to get away with only looking a few feet ahead, but I've found looking far ahead is a key to consistency.

Once you get good, adapting to different karts becomes crucial to being consistently fast, particularly if you are running in a series. Don't be fixed on a particular braking point or turn in point. Karts can vary in power and handling. If you have a kart down on power you may be able to brake later and turn in later. If the kart is not handling to your liking try something different with steering or braking.

Finally here are a few advanced theories that may or may not work for you. I don't really know if all of these are significantly effective. Try at your own discretion:

  • moving the seat forward should create more understeer, backward should create more oversteer.

  • Similarly you can try shifting your body weight within the kart while driving. You can try pushing back under braking since the kart only has a rear brake, shifting forward in corners where you what to help the kart rotate and backward when you want rear grip.

  • shift your weight to the outside on the turn when cornering. The theory is since the kart does not have a differential, the rear wheels will always spin at the same speed, but when cornering, the outside wheel is covering more distance. Ideally, you actually want to try to lift the inside. That's not really possible (that I know of) on a slick indoor track) but leaning to the outside will help the outside rear "bite" and taking weight off the inside rear will help it spin.

  • to the extreme, you can try bracing yourself on the wheel and pushing back with your outside arm/shoulder. not only would this help for the reason above, it also supposedly stiffens the kart.

  • when the kart is accelerating, you can try bouncing up up and down with your body, no joke. Don't quite know the theory behind this, but I've seen it before.

  • I'll add more tips as I think of them.