Well, I'll start the answering, and the others can contribute if I'm wrong or have missed out something. My answers in bold. 1] Plug wires? On a stock car, useless. 2] Iridium Spark Plugs, 4 electrode plugs? Same as above. 3] Air filter/CAI? colder denser air gives more power, how dense it can be ?? Useful, but CAI could get wet and damage engine in the rain. How dense air can get depends on location, altitude, season etc. 4] Lightened flywheel? Practically useless, since you will die in traffic. 5] electric supercharger? supercharger is to make air dense, good for hilly region operation. airplane piston engines have supercharger for this reason Hahahahaha...this is the most useless. 6] synthetic oil? good lubricated engine with good cooling property can help in better life of engine than powerTrue, useful. But also expensive to an extreme for some brands. Whether it justifies the expense is debatable 7] 97 octane fuel with octane boosters? beter octane rating better power.Useless on a stock car. A lot of Indian cars perform better on regular unleaded. 8] TB spacers? not for mpfi i suppose... for the carb muscle cars. Useless. 9] Strut braces? handling Useful. But then you have to push the car or drive that fast to know the difference. 10] ECU reflash or remapping? this should definitely exploit the full potential of engine, but loss of fuel economy. Depends on what you remap for. And I don't think you can get it done anywhere in India. 11] Low profile tyres? great handling improvement at educed ride quality and more surface drag beyond a particular size? Also heavier, since the rim will be larger. 12] free flow exhausts? this does help but cost a sound No it doesn't. An exhaust system is like a chain. Only as strong as its weakest link. The most restrictive part is normally the cat-con or the mid-muffler. You need a complete free-flow system with a well-designed set of headers to extract some power. 13] high lift cams? giving more feed to engine, hope it can eat it all without vomiting. Costs a load. You will need to fiddle with idle settings for days to get it right. Bye-bye, fuel efficiency. Low-end response will also die, if you get a wild cam. 14)porting polishing? whats this. Enlarging and smoothing the ports on the intake and exhaust of the head, to ensure better flow-rates. Helps. 15) reduce weight? this will definitely increase power due increased power to weight ratio. And your car will bounce about because there is less weight to root it to the ground. 16) do not ice performance cars.you put in lot of weight with those sub and its box, amps. dampimg And again, your car will bounce about. 17)spoilers? we do not have spoilers which provide any performance increase since all are bad design and fully cosmetic in nature. a inverted aerofoil structure should face the wind for providing aerodynamics many look funny but they work, it starts above 150kmph speed. Useless, unless you live on the autobahn. 18)corner slammers and dtm slammers? lighter cars tend to keep lifting of ground, these give downward force to help keep front wheel on ground. Never seen a car lift its front off the ground. 19)see a formula car for design improvements, why it sticks to tarmac? its the design Also it only seats one, gets wet easily, is too low, has no GC, etc. Life is all about choices... |