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Modification of the NA engine
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<blockquote data-quote="rollakid" data-source="post: 1029477" data-attributes="member: 6588"><p>best way to start playing with turbo engine, since its made to be turbocharged from the start thus you save yourself potential headaches.</p><p></p><p>If you are after big horsepower, turbo is the only 'value for money' way to do it, and more drivable on the road. Why i say so? okay, lets look at 220hp 1.6liter engine, a turbocharged one that pumps 220hp is very normal and easy to drive on the road, while an NA version with 220hp will give you a hell lot of problem like stall engine during traffic jam, engine can't idle properly and not having any power at all at low rev, and to the extreme changing gear sometime might not be as smooth since with super light weight flywheel you'll not only be facing prob of stalling but also rev drop too fast if you shift too slow.</p><p></p><p>those who play with NA would know the pain of spending a few thousand for a couple of hoursepower and no matter how much you spend it is unlikely to double your car's horsepower while turbocharged engine owner would be able to get few times the power from teh stock just by giving it more boost.</p><p></p><p>oh ya, one thing before i forgot, the "g-force" you feel when acceleration depends more on the torque than the horsepower. you can mod and mod and mod an NA engine and see the horsepower rating goes up but in reality the mods just increase the torque by a little bit and shift the powerband upward the rev range and as a result give higher HP. HP is useful to run fast in a track but not really the whole case if you are talking about the street. 4age for example, stock one comes with about 15kg-m of torque, and the highest torque i've seen from a 4ag is about 19.6kg-m, thats about 30+% increase from the stock, and it won't make power under 6000rpm. According to some other forum i've participate in, they haven't seen a single NA engine in the world</p><p>make more than 89lb-ft of torque per litter</p><p></p><p>on the other hand turbocharged give alot more power with alot less money...</p></blockquote><p></p>
[QUOTE="rollakid, post: 1029477, member: 6588"] best way to start playing with turbo engine, since its made to be turbocharged from the start thus you save yourself potential headaches. If you are after big horsepower, turbo is the only 'value for money' way to do it, and more drivable on the road. Why i say so? okay, lets look at 220hp 1.6liter engine, a turbocharged one that pumps 220hp is very normal and easy to drive on the road, while an NA version with 220hp will give you a hell lot of problem like stall engine during traffic jam, engine can't idle properly and not having any power at all at low rev, and to the extreme changing gear sometime might not be as smooth since with super light weight flywheel you'll not only be facing prob of stalling but also rev drop too fast if you shift too slow. those who play with NA would know the pain of spending a few thousand for a couple of hoursepower and no matter how much you spend it is unlikely to double your car's horsepower while turbocharged engine owner would be able to get few times the power from teh stock just by giving it more boost. oh ya, one thing before i forgot, the "g-force" you feel when acceleration depends more on the torque than the horsepower. you can mod and mod and mod an NA engine and see the horsepower rating goes up but in reality the mods just increase the torque by a little bit and shift the powerband upward the rev range and as a result give higher HP. HP is useful to run fast in a track but not really the whole case if you are talking about the street. 4age for example, stock one comes with about 15kg-m of torque, and the highest torque i've seen from a 4ag is about 19.6kg-m, thats about 30+% increase from the stock, and it won't make power under 6000rpm. According to some other forum i've participate in, they haven't seen a single NA engine in the world make more than 89lb-ft of torque per litter on the other hand turbocharged give alot more power with alot less money... [/QUOTE]
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