What is “low end”, “midrange”, and “top end” horsepower? And why is it so important to consider when choosing a performance product such as Intake Spacers, Exhaust, Cold Air Intake, thermal engineering 2 pdf? The terms “low end”, “midrange”, and “top end” are often used when determining the performance of a vehicle.
They do not have anything to do with the speed at which the car is moving. But they have to do with how much horsepower the engine makes at a certain RPM. Every engine has, what’s called, a “powerband”. This is how much power your engine makes at every RPM. To illustrate, lets say you are racing your Nissan at the drag strip and you are ready to launch your car and go wide open throttle.
At the start of the race, your tachometer will read approximately 800rpm at idle. Depending on your launch technique, you will usually start out around 2-3K rpm. That is what is considered the “low end” portion of your powerband. When you launch the car in 1st gear, your tachometer will start at roughly 2K RPM and quickly rise until you have to shift into 2nd gear. But why is it important to carefully consider this when choosing a particular modification for your engine, whether it is an Intake Spacer Kit, Exhaust, or Cold Air Intake? That is because not all performance parts that are out on the market will make your car accelerate faster.
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Some actually can make your car accelerate SLOWER than it did before. 4 mile, or from 0-60mph, you never want to do any modifications that will hurt your midrange or top end power since that is where you spend the majority of your time accelerating. To understand this, think back to our illustration of the drag strip. You have just raced your car all the way through the powerband in 1st gear. Now you must shift into 2nd gear.
Whether you have an automatic or a manual transmission, the results are the same. When you shift into 2nd gear, the tachometer will drop from around 6500 RPM to roughly 4500 RPM depending on your transmission’s gearing. You are now in the “midrange” portion of your powerband in 2nd gear. So you want to pay close attention to your midrange and top end HP and make sure that when you do a modification to your engine, that it does not decrease the power output in these parts of the powerband.
The midrange and topend are VERY CRUCIAL! It is also fine to increase “low end” power to make your car faster, but be sure that it does not hurt the midrange and topend in exchange for increased low end or you could make your car slower! And if you do a modification that hurts low end power in exchange for increased midrange and top end power, you MUST gain enough top end to counteract that low end loss or your car will be slower! Our VIAS Block Plate for the 02-08 Maxima is a good example. This modification will hurt low end HP, but since you gain plenty of midrange and top end in exchange, your car will be faster. We conduct the most accurate and extensive testing out of any other company in the market.
We do this with all our Intake Spacer Kits. D and testing go into each kit we offer backed up by proven dyno gains. And unlike most other shops, we do not simply advertise 2 dyno charts to show the HP increase. Before we conduct our dyno testing, several measures are taken to ensure consistency.