Purchasing V300SD Racepacks, need some help.

The Math Channels are an advanced function that allows the user to build formulas to compute out answers from recorded data. I use them but a lot of racers don't and my guess is you will not be using them. You can still run a flow meter without a Math Channel. The Ignition Timing feature allows you to record the actual ignition timing the motor is seeing from a pickup on the crankshaft. You can still do that on a standard unit. One thing I would recommend is buying a second SD card. The reason being is if you take the card out to replay the data you have the possibility of forgetting to put it back in and making a run without it. I use two cards and swap them out so there is never a chance of not having one in the unit. If you are using the MSD Grid then you can get a VNET adapter to allow the recording of the Grid data on the Racepak including the programmed ignition timing.