My sons have just bought a GTech Pro performance meter. It's this one in Demon Tweek's products list and was bought on an SXOC members' special buy from another firm for just

Do you have to set it up for vehicle weight etc. Denis?

That Impreza sounds damn quick! :eek: and I didn't think a 328 would do quite so well, either (ah, but modded, you say )

I think that they use on-silicon accelerometers, so are pretty accurate as long as they're on the level (they might only have sensors in one plane).

Edit: that is to say that they will only *under*-read, because if they're not level then you'll lose the non-horizontal component of the acceleration. So that Imprezza's quite quick

Weight is needed for HP calculations only. Both my sons have taken their cars to a local public weighbridge today. I will do so when I next fill up the 4X4 and then borrow the meter.

Denis, may I refer you to this thread?