Re: G-Tech Meters
They can be accurate, but mine is "consistantly" inaccurate, which isn't bad either.
I have an older style g-tech pro (small radar detector style). There is a new model available.
It consistantly showed my 1/4 mile times about 0.3-0.4 seconds more than actual. I took it to the strip a few weeks back on six runs. It showed my MPH trap speeds about 2mph higher than actual. They claim to be good within 0.1 sec????
Yep: note the fuel level in your tank and go to a weigh bridge (your local tip), with you in the car. Transfer the kilo's into pounds and enter into the g-tech for RWHP readings. They're not too bad.
So, they're not always totally exact, but consistant, which allows you to use them for testing and tuning and note any improvements.
Don't spend $300+ on them either. You can get them for $50-100 on ebay.
393 Tremec TKO 9"