until a tune.
thank you for clarifying this, very good to know. I think I and a bunch of people are probably just unsure of how exactly a MAP system works since we've probably all had mostly MAF cars in the past*sigh* the car will NOT run rich due to intake changes. You could run a car with a filter built from a wool blanket next to a car without a filter at all... the cars will adjust their fuel trims accordingly and run just fine based on the air available.
The ECU constantly monitors the air/fuel mix in the exhaust, via the upstream O2 sensor, and constantly adjusts the injector pulse width to compensate.
The entire "open intake makes your car rich" theory is funny... think about it: 'rich' means more fuel than required, which means less air... how is a less restrictive intake supposed to lower the air coming in? If anything... logic would say that you'd run lean. But thankfully fuel injection and O2 sensors (and the last 30 years of auto engineering...) have completely negated the problem and the car will compensate for nearly anything you can throw at it.
to get the potential from youre purchase like a cai it will run rich until you get the tune.kiatech wrote:
*sigh* the car will NOT run rich due to intake changes. You could run a car with a filter built from a wool blanket next to a car without a filter at all... the cars will adjust their fuel trims accordingly and run just fine based on the air available.
The ECU constantly monitors the air/fuel mix in the exhaust, via the upstream O2 sensor, and constantly adjusts the injector pulse width to compensate.
The entire "open intake makes your car rich" theory is funny... think about it: 'rich' means more fuel than required, which means less air... how is a less restrictive intake supposed to lower the air coming in? If anything... logic would say that you'd run lean. But thankfully fuel injection and O2 sensors (and the last 30 years of auto engineering...) have completely negated the problem and the car will compensate for nearly anything you can throw at it.
Gasoline has a BTU rating of around 115,000 or so. This stays the same irregardless of the octane rating. The octane rating is a measure of a fuels resistance to auto ignite. So your running a fuel in your engine that's harder to ignite than what it was designed for. You won't get as complete a burn which results in less power and higher emmisions. As KiaTech says the ECU over time will adapt to the higher octane of the fuel and make use of it. However no manufacturer is going to allow it's ECU to come close to pushing the fuel and timing curves to just before detontation especially if the engine doesn't have a knock sensor for the simple reason of warranty issues. If your able to flash the ECU to take full advantage of the 91 or high octane then it's probably worth it but for maybe a few horsepower from the stock ECU with the fuel costing 11 cents a litre more doesn't really seem worth it IMO It's strange you don't have 87 octane there. How much does the 89 cost?You'll lose power if you use higher octane fuel?? I can't find a station in my city that carries 87 grade. It is 89 to 93 grades.
You realize of course that the Forte comes from the factory with what is essentially a CAI? And what science or voodoo do you wish to cite to back up your claim? I have provided a very complete argument to support my side of the debate; let's see your's. I am not trying to start a war, but my intentions here are to support the forum with facts and known information. You arguing against me will require that you substantiate your claim.to get the potential from youre purchase like a cai it will run rich until you get the tune.
