Posts

Showing posts from February 19, 2006

Tyres Size on your SUBARU WRX STI CAR?

What do you mean when you say 185-65HR13? 185 65 H R 13 This is the width in mm of the tyre from sidewall to sidewall when it's unstressed and you're looking at it head on (or top-down). This is known as the section width . This is the ratio of the height of the tyre sidewall, ( section height ), expressed as a percentage of the width. It is known as the aspect ratio. In this case, 65% of 185mm is 120.25mm - the section height. This is the speed rating of the tyre. This tells you that the tyre is a radial construction. Check out tyre construction if you want to know what that means. This is the diameter in inches of the rim of the wheel that the tyre has been designed to fit on. Don't ask me why tyre sizes mix imperial and metric measurements. They just do. Okay?

Decoding the information on the sidewalll of your tyres

Image
Ever wonder what does the coding on the sidewall of the tyres on your car means. Below is some information may be helpful. Key Description A Manufacturers or brand name, and commercial name or identity. B and J Tyre size, construction and speed rating designations. Tubeless designates a tyre which requires no inner tube. See tyre sizes and speed ratings below. C Denotes type of tyre construction. D M&S denotes a tyre designed for mud and snow. Reinforced marking only where applicable. E Load and pressure marking requirement (not applicable in the UK ). These go from a load index of 50 (190kg) up to an index of 169 (5800kg). F ECE (not EEC) type approval mark and number. G North American Dept of Transport compliance symbols and identification numbers. H Country of manuf...

Prodrive P2 technology demonstrator

Image
P2 is a concept car developed by David Richard's racing and engineering firm Prodrive . Styled by Peter Steven, the car had design details similar to his MG SV. Mechanically, the car was based on Subaru Impreza's WRX STI engine and drivetrain , but the 2.0 turbocharged boxer engine is boosted to 345 horsepower, while the 4WD system added Prodrive's Active Torque Dynamics system (with active center and rear differentials like the rally Impreza). Besides, an "anti-lag system" is added to the turbocharger, which, like the afterburner of aircraft jet engines, burns the unburnt fuel in the exhaust manifolds to increase gas pressure to the exhaust turbine. The 1100 kg car claims 174 mph top speed and 0-60 mph in 3.8 seconds . Surprisingly, Prodrive said the chassis was derived from the Japanese Subaru R1 Kei-car, hard to believe. Despite of its exciting spec, Prodrive cannot put it into production by its own. However, the Active Torque Dynamics system and Anti-Lag ...