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We may also find that during the cranking phase of engine startup, we require even more fuel, over and above what we require once the engine has started. To make up for this, we need to provide additional fuel when the engine is cold. This means that some of the fuel is going to pool and be introduced in liquid form which makes for much more difficult combustion. Conversely, when the engine is cold, a portion of this fuel is going to wet out against the port walls. When the port walls and the back of the intake valve are hot, the fuel will vaporise off them and be drawn into the combustion chamber in vapour form, making for easy combustion. Why Do We Need Additional Fuel When Cold Starting?īefore we get to the how, let’s discuss the why. Having said that, if we can turn up to an event and start the car while it’s still on the trailer in order to back it off, why not award ourselves this luxury? If it’s a drag car then you might not be quite so concerned. If it’s a daily driver then obviously we want great cold start performance.
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While we’re tuning, we need to keep in mind what the car will be used for. In this article: Why Do We Need Additional Fuel When Cold Starting? | Cold Starts: Every engine is different | What Parameters Are Affected By Cold Temperature Operation? | Cold Start Considerations: One, Two, Three | Parameters Available In The Haltech Elite | The Cold Start Tuning Process Simply put, we want a car where, regardless of whether you’re in Outback Australia on a hot summer’s day, or you’re in Queenstown, New Zealand for ski season, you can turn the key with no throttle, have the car idle crisply and smoothly, all while maintaining good control of the air-fuel ratio as it warms up. Our aim when tuning cold start, is to get as close as possible to the sort of performance we get from a factory car. This really comes down to not having a full understanding of the fundamentals behind it and not knowing how to make the necessary adjustments in order to get the cold start working perfectly. Cold start tuning is an area that a lot of tuners and enthusiasts really struggle with.