S3 and GTi intercooler comparative evaluation

FAW-Volkswagen produced by the domestic version of the Golf GTi, will become hot after the launch vehicles converted community. After 20 to 10 000, but can be easily upgraded to 250 or even close to 400 of strength, with the GTi turbo system really attractive. Golf GTi owners many times during the conversion of the power section, will choose to replace a larger intercooler, to improve air cooling effect. The lower the temperature of the air entering the cylinder in theory, the higher the density of oxygen molecules, and lower the temperature of the compressed gas, more conducive to the issuance of horsepower. So turbocharged vehicles in the cold will be to reduce the air temperature. Helpless GTi intercooler sandwiched between the radiator and the air conditioning tanks, more than discounted the cooling effect due to size limitations, a choice not many. The most common home and abroad, or even formulaic conversion, that is, change into the same platform with the Group's high-performance cars Audi S3 intercooler. So what S3 cooler, cooler than the original, well how much, or that there is no replacement value? For a lot of problems I GTi owners are concerned, do a simple comparison, we want to give to the owner a reference. crankshafts

Data comparison
Because the Audi A3 and golf on the same platform, the same 2.0T engine, S3 and GTi intercooler external dimensions substantially the same shape, and fixed pin is completely the same, it can be directly interchangeable. S3 intercooler is made of aluminum alloy, while the GTi-cooled heat sink portion is in aluminum production, on both sides with plastic. Intercooler cooling effectiveness level, depending on the air through the intercooler in the process, the heat transfer efficiency out. Which in the cold wind area, thickness, number of rows of air passages, cooling fins density, etc., play a decisive role. In this part of the cold frontal area, S3 and GTi little gap, but in the cold frontal area more limited in front of the grille size. The thickness of the link, we compare the thickness of the two intercoolers central portion, GTi original intercooler data is 34.6mm, S3 intercooler there 41.5mm. Air channel line in several areas, GTi 27 rows cold, S3 is 31 lines; the same time, one-way channel of height, GTi is about 7.5mm, and S3 is 6.9mm. These two sets of data show that although the number of lines S3 intercooler GTi more than 4, but in actual ventilated area, GTi and S3 far off, almost prove their ventilation. And in the same ventilation, heat exchange is complete, we should see fin density. Our five fold as a unit to measure, to the greatest extent eliminate manufacturing errors, GTi span is about 15.5mm, and S3 is 12.4mm. With another expression, in the same span, the number of fins fold S3 is 25% more than the GTi. For example, GTi can accommodate 100 wrinkles space, S3 intercooler that number is 125.

As can be seen from the above data and calculations, billet steel crankshaft excluding materials, production processes, etc., only from the perspective of data measurements can also see S3 intercooler cooling efficiency in determining the indicators are the original GTi victory parts, indeed the Audi high-performance models of accessories. If, after further calculations, the amount of air inside can hold (in the cold in the cold thickness x width x height x number of rows a single line, the thickness of the cooler material is taken into account), S3 GTi more than about 25% -30 % (a rough calculation, for reference). This shows that by replacing the cooler, there are more than enhance the cooling effect, also will not be a substantial increase in the volume of the cold and bring significant turbo lag. In the original premise of the turbine without replacement, S3 in the cold it is a fairly both provide better cooling effect, taking into account the speed of response options. It also verified the same plant parts flow with high-performance models, it is indeed a high cost of conversion method.