Looking at the Racepak price list
The Racepak V300SD is $2,231
Thermocouple module with probe $189
Intercooler inlet temperature $169
Air/fuel ratio $359
Pressure/vacuum manifold $249
You get the idea. You have to pick price first then see what fits your budget. Spending multiple thousands of dollars is easy.
Those are list prices. Check Ebay and racingjunk.com. Look for used systems.
Having said that, you can't have too much information.
Well, maybe. You also have to look at your overall program. Having information an doing something with that information is another topic. If you don't have a big dyno budget you have to take a good look at what the information will gain you.
Rpm. Seeing where you you are shifting and how long you spend in any one gear is informative. Wheel slip will show.
Speed you can get from a logging GPS if you already have one. Or add a wheel sensor.
AFR, EGT, and oxygen sensors will help with the tuning.
Oil pressure, fuel pressure, nitrous pressure, boost pressure, manifold pressure/vacuum, pan vacuum . . .
accelerometer or G-meter. Lets you know how hard you are pulling through the gears and where the soft spots are.
Cylinder head temperature, coolant temperature, manifold inlet temperature, oil temperature . . .
Most ECU's can data log. Just be careful that the sampling rates are equal to what a true data logger will do. Missing critical information ain't fun.
