Noise levels vary with speed and different road surfaces. When the engine is idling and the vehicle at a standstill, there’s barely any audible sounds. At speed, however, you’ll hear the wind, the tyres, the transmission and engine droning, and any vehicles on the road. Driving on paved roads and dirt trials also makes a difference. Though most carmakers now take the time to reduce noise and improve cabin comfort and ride quality, older vehicles tend to struggle in this respect. If you’re rebuilding an older car, or have one still in use, there are ways that you can reduce noise to tolerable levels.  

What is Sound Deadening?  

Sound deadening in vehicles means reducing the sound entering the cabin. Car builders and manufacturers use a range of auto noise insulation products that dampen and absorb sounds emanating from different parts of the car. Body panels and chassis components are the main culprits here, since they resonate when vehicles gain speed. And sounds increase with speed. To deaden out uncomfortable levels entering the cabin, the car floor can be insulated with layers of different sound insulating products. The thicker the layers, the less sound and noise there will be.  

Types of Sound Insulating Products 

Older cars relied on layers of bitumen-based mats that were fitted below the carpet and the carpet underlay. Newer products however provide better insulation, and aren’t as thick, meaning several layers can fit in the same space. These are butyl rubber dampening sheets that are fused with an aluminium top layer for additional effectiveness. They are only 2mm thick, yet stick well to all types of sheet metals in the car floor. The combination not only reduces sound, but also heat from the exhaust, transmission and engine. In addition, butyl rubber is impermeable so doesn’t let in water or other liquids, and won’t rot or deteriorate when exposed to higher temperatures over time. This is the first layer of a multi-layer solution to sound insulation. Butyl rubber pieces are cut and shaped to fit the car contours. They are fitted to the floor, roof, firewall, along doors, the boot and inside cavities. You can continue with adding the carpet, or go with other products if there is space available.  

To reduce noise levels even more, a second layer is added. This consists of mass vinyl that covers the entire floor pan from the front to the rear firewall. Mass vinyl comes in at 2mm and is coupled with a 6 to 8mm thick closed-cell foam layer. The combination is easily applied, and acts as a sound barrier to completely block out sound. It too is durable, water and heat resistant, so increases cabin comfort further. It has a non-stick surface, so is easily removed. If you see this as a permanent sound and heat solution, then adhesives can be used on the foam for a secure fit. 

The three-layer auto noise insulation combo is what luxury car makers use in their high-end cars. They deaden noise, and also serve to reduce heat. Sound deadening packs are available for most vehicles. However, they’re best suited for utes, vans and 4WDs that see extensive use in conditions that generate a lot of noise. Vehicle-specific packs are available, so there’s minimal work in applying separate layers and no mismatching parts. If you’re rebuilding old classics, then noise insulation will provide you with less cabin noise and also more bearable temperatures.  

Benefits of Sound Insulation 

Buyers opting for auto noise insulation products are seeking a quieter, comfier ride. Even the butyl rubber layer used on its own lowers decibels significantly. But in combination with the mass vinyl and foam insulation, road, tyre and engine sound are brought to a minimum. All that is left is to add the carpet of your choice on top. A quieter cabin lets drivers and passengers talk without the need to shout, hear every note from the speakers, and reduce stress levels from high-pitched noise. In addition, sound layers reduce heat along the firewalls and car floor, particularly good for long, hot Aussie summers. And they act as barriers from any spills that can make their way into cabling or cause rust.  

Installation and Buying 

If you’re rebuilding an older car, you’ll already have it stripped down. Layers are easily applied and fit to the floor well. You can also choose to have the insulation professionally installed. Retailers that stock automotive sound insulation products also offer installation. Get a quote and look for kits that fit your car.

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Insulation

Car insulation is without a doubt an extremely important factor when it comes to off-road driving comfort. Not only that, but it can also play a key role in other factors as well, such as fuel economy, reliability, and vehicle longevity, which is especially true when it comes to automotive thermal insulation. When you’re driving off-road, chances are you’ll not only feel the bumps, but you’ll also hear them. That can get very grating very quickly, so making sure your vehicle is sound deadened is also recommended. Thermal insulation will not only regulate the temperature in the vehicle which can be a godsend when traversing off-road at night, but also regulates heat accumulation and generation, and allows your vehicle to cool and heat properly, depending on which is needed. Getting both automotive insulation and sound deadening is something you should definitely consider, as you’re bound to see their benefits sooner, rather than later. Automotive insulation and sound deadening often go hand in hand, and there are companies that can install both.

Suspension

This is often the first thing people think about when it comes to off-road. Suspension undeniably plays an enormous role in off-road driving, which is why it’s so crucial when it comes to driving comfort. Without good suspension in any vehicle, you’re not going to feel comfortable, period. Most spring and hardware setups are only tested for street and urban usage, so you’ll rarely find stock suspension that the manufacturer tested for off-road use. Aftermarket upgrades are definitely the way to go, as they’ll not only increase your overall driving comfort when off-road but also improve your vehicle’s off-road capabilities. When you’re getting a new suspension system, one of the first things you should look for is a package that focuses on key reinforcement areas and good-quality peripherals as those are key to making your off-road experience even more refined.

Tyres

It should go without saying that tyres are quite important for off-road driving. They’re not only essential for performance and comfort, but they can also enhance your vehicle’s look. Like with suspension, most manufacturers don’t really focus on off-road tyres in their stock offering, which is why getting new tyres afterwards isn’t uncommon. Off-road tyres will improve your traction on all types of surfaces, which can improve your vehicle’s climbing capability. Almost all off-road tyres have a drastically higher rubber quality, a factor that plays an enormous role in reducing tyre failure rates mid-trip, which in turn means better driving comfort, partially due to ease of mind.

Bull bars

Something that a lot of off-road drivers tend to neglect is getting a bull bar. They’re often regarded as brush bars, meaning they protect the front of your vehicle from things like grass, foliage, brush, and practically anything else that might stand in the way. While not a deal-breaker for most, it’s always smart to have something that doesn’t allow your car to swipe at something in front or underneath. You won’t feel anything as you’re driving, even though you’ll most likely be ploughing through obstacles. On top of that, bull bars protect your car from serious damage as well. Nothing ruins a good off-road trip like seeing a dent in a place where there shouldn’t be one, especially when knowing full well that you could have easily prevented it.

Lighting

Stock lights for cars are often underwhelming, especially when you’re driving off-road. Most people tend to completely forget that you can install custom lighting on your car, and they’re surprised when they see that you can find some great products on offer. During off-road sessions, you most likely want more than the baseline illumination. Without good lights, it can be quite difficult navigating the wilds, because at night you’ll most likely be far away from civilisation and any light pollution. If you can’t see, you just increase your chances of damaging your car, which a good lighting solution will certainly prevent.

Clean the Filters

Air filters have a tendency to clog very easily. Things like dust, pollen, smog, and a plethora of other contaminants can easily clog them, which means your driving cabin will get contaminated as well. It’s easy to understand why this might be such a big deal when off-roading. If you notice odours coming from the vents, strange noise coming from the fan, or if you feel like the airflow is reduced, then the vents might be due to cleaning. Cleaning the filters a few times with a damp cloth before replacing them is smart, but you’ll have to get them replaced at some point.

Lumbar Support

Last but certainly not least, lumbar support is extremely important in any given situation when you’re sitting for extended periods of time. That goes even more so for off-road driving, as you’re never going to sit still during driving. Good lumbar support will prevent any chronic and acute pain from backaches, muscle aches, arthritis, herniated disks, and much more. Lumbar support plays an enormous role in how long you can drive without feeling discomfort, and it should be the very first thing you take care of when getting a new vehicle.

Off-road driving is extremely pleasant. It’s something you can do for the thrill of an adventure, to just let your mind wander while you’re ploughing through the wilds, or even to just escape civilisation for a while. Off-road driving comfort is something you should absolutely look towards when planning your next trip because it might make or break the trip, especially if you’ve been feeling discomfort in the past.

The post How to Improve your Off-Road Driving Comfort appeared first on Sherlocks.com.au Blog.