Join Date: Dec 2003
Location: Sydney, NSW, Australia
Re: What is the best way to judge how fast a car will go?
rwkW calculators are the most poorly thought out, inefficient calculators possible. Go to google and search for Virtual Engine Calculator. It's a program I use for calculating cubic inches from bore x stroke numbers, and calculating your ET from power. Enter your crankshaft power, in Horsepower, so if you own a stock 260kW BA XR8, you input 348 for 348hp... and your weight in pounds, so for the stock XR8, 3949lbs (1795kg). It gives you your ET @ mph for 1/4 and 1/8 mile.
Keep in mind, this does not take gear ratios, weather conditions, traction etc into account, but I have found it pretty accurate. For a stock XR8 is says 13.76 @ 97.9mph. Lots of people in stock BA XR8's on this forum have run 13.8s @ 100mph.
ANY calculator based on power output in the wheels should be thrown away and poked fun at. It is by far the MOST inefficient and stupid way to calculate one's ET. Every 2 minutes your rwkW is different. Dyno the exact same car, on the exact same dyno, say 10 minutes apart, and you will get a different reading each time. Chassis dynos can never be accurate, ever, unless the power went direct to the wheels, no tranny and s*** in the way to sap any of it.