Originally Posted By: Olas
You want a Hatchback from Volkswagen, as a GTI?
You have two options,
The Polo GTI or the Golf GTI - Americans usually like larger cars so I'll assume you'd prefer the Golf..
Well screwed together, fast, fun, comfortable, easy to work on, sure all cars can have things go wrong with them from time to time but VW no more than any other manufacturer (less often than many)
The only things I'd advise/urge/reccomend/beg you to do are;
Vent the PCV to atmosphere - direct injection just LOVES to carbon the inlet valves (VTA solves the problem)
If you don't already have one, buy a cheap OBD scanner of the E Bay
Remember that the knock sensor and boost actuators are very sensitive to octane - use the best fuel you can get.
In the UK fuel comes at 95, 97 or 99 octane, I think you guys get 87&91?
No Polo on this side of the pond; you guys get all the cool stuff.
As for octane, we use different standards. If Wikipedia is to be believed, your low end gas is 95 RON while ours is 87 AKI. AKI is 4 to 5 points below RON, so our 93 octane is about 97ish. So we have lower octane gas, but it's not quite as drastic as first glance indicates.
http://en.wikipedia.org/wiki/Octane_rating
Originally Posted By: wikipedia
Research Octane Number (RON)
The most common type of octane rating worldwide is the Research Octane Number (RON). RON is determined by running the fuel in a test engine with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of iso-octane and n-heptane.
Motor Octane Number (MON)
There is another type of octane rating, called Motor Octane Number (MON), which is a better measure of how the fuel behaves when under load, as it is determined at 900 rpm engine speed, instead of the 600 rpm for RON.[1] MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, higher engine speed, and variable ignition timing to further stress the fuel's knock resistance. Depending on the composition of the fuel, the MON of a modern gasoline will be about 8 to 10 points lower than the RON, however there is no direct link between RON and MON. Normally, fuel specifications require both a minimum RON and a minimum MON.[citation needed]
Anti-Knock Index (AKI)
In most countries, including Australia, New Zealand and all of those in Europe,[citation needed] the "headline" octane rating shown on the pump is the RON, but in Canada, the United States, Brazil, and some other countries, the headline number is the average of the RON and the MON, called the Anti-Knock Index (AKI, and often written on pumps as (R+M)/2). It may also sometimes be called the Pump Octane Number (PON).
Difference between RON and AKI
Because of the 8 to 10 point difference noted above, the octane rating shown in Canada and the United States is 4 to 5 points lower than the rating shown elsewhere in the world for the same fuel. This difference is known as the fuel's sensitivity,[4] and is not typically published for those countries that use the Anti-Knock Index labelling system.