Index Racing (Engine Build and Tips/Tricks)

For index racing your car is going to need to be able to run the index in the worst air condition of the year. So I'd shoot for at least 2-3 tenths quicker in good air for 1/4 mile, maybe 1-2 tenths if 1/8 mile racing. Than you need some time of "system" to slow the car down consistently to run as close to the index as you can. Either via adding weight, an adjustable throttle pedal stop, restrictor plate system, etc. My wife and I run the 7.10 index at our track. My car goes 6.70s, her goes 6.80s. In good air I can run 7.10s by unhooking the secondary, but in crappy air I can't. I now have a ez plate system on my car that works great. Her car doesn't have enough room for the ez plate system so I have an adjustable throttle cable on her car and add weight to make it run the index.