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Why do you want to increase the power in an Elantra? From the road test on this car that I've read, the suspension isn't really worth the price and effort to bump up power. They're coming out with a GT version (four door hatch) and later a coupe version with the same engine but with an alledgedly improved suspension. It would be sweet if they could take the Sonata base engine or a detuned Sonata turbo engine and drop either in the Elantra GT or coupe.
The vehicle manufacturers design their cars for ALL driving conditions and test them in ALL driving conditions.
Like lower and higher altitude where the amounts of oxygen in the air differs. Or very cold / very hot weather. Humid / dry air. Driving uphill for very long stretches in very hot weather. Etc.
So the car you get from the factory will operate in all those different conditions.
Do these "chip" sellers do the same amount of testing? Will the vehicle still operate as it should in extreme driving conditions?
I think I would rather trust the rooms full of engineers who design and test these vehicles at the factory.
Same goes for installing non-factory specification parts like spark plugs, spark plug wires, air cleaners, etc. These things may "look" impressive, but I see a LOT of people switch out these parts, then have all sorts of engine and other troubles.
Unfortunately, he doesn't design them for foreign cars, but one of my engineers designs (and sells) a processor reprogramming kit, that includes an application that runs on a PC, and an interface cable. You can reprogram almost all aspects of the car that are processor-controlled (it saves the factory settings, so you can always go back). Things like shift points, advance curves, etc. A whole pile of parameters, but you need to know what you are doing. He sold a huge pile of them to race car enthusiasts. It works really well. I would imagine it voids the warranty, thus you need to put back the original settings if you toast the engine.
The brother of another one of my engineers does the same thing for diesel truck engines (such as the Cummins), like those in the bigger pickups. The problem there is if you aren't careful, you can generate so much torque that the transmission gets destroyed.
But I digress, as usual.
Bottom line is the drop-in chips don't really work.
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