Underdrive Pulley Set

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Underdrive Pulley Set
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There was a time when people used to be happy with orthodox designs and features on their vehicles - but days have changed!

No one seems to be satisfied unless they browse through popular custom car sites using the Internet and find a stylish accessory which could be used to elevate the image and performance of their machines. Even the owners of brand new luxury automobiles in US are going for customization of their vehicles. Though global economic condition is not that favorable, auto accessories market seems to be on fire - everyone is ready to pay a good part of their incomes to ensure that their vehicle looks better than the neighbor's!

Recently, a custom-made UFC-branded Chevrolet Camaro was auctioned off for a charity at a staggering $350,000 price point. The money raised is being used to benefit the Intrepid Fallen Heroes Fund. The "limited edition supercar" comes with a 650-horsepower ultracharged V8 engine and was bought by Shannon West of Grand Junction, Colorado.

Falling Back In Time

Custom car fad started trickling down to automobile enthusiasts around 1940s in the Los Angeles area. At this time, Harry Westergard started to customize '36 Ford cabriolets and coupes in his home garage at Southern California. It's quite interesting to know that even car racing legend Frank Kurtis did automotive modification work in L.A between his racing activities. Typical car modifications in this era involved trim removal, adding glass-pack mufflers to get the 'heavy sound", and chopping the top.

Present Day Custom Cars

As customization heavily affected the urban population in US, even branded automakers of the world started offering customization services to ensure a better a clientele base. Present day custom works involve addition of selected automotive accessories such as:

* Grille Bars & Bull Bars

* Tonneau Covers

* High-end air intake systems

* Underdrive Pulleys

Muscle cars have regained their lost popularity as Americans have realized that their retro structures offer best customization prospects. People are more interested on checking custom car sites to lay their hands on legendary muscle cars such as Camaro, Challenger, and Mustang!

http://www.carz.com happens to be one of the best custom car sites, and promises to showcase latest customized designs.

Types Of Pulleys To Use On Your Muscle Car

You might have heard of an old trick in the world of automotive performance that uses special pulleys to somehow pick up more horsepower from an otherwise stock motor. This might seem a little too good to be true, but actually it is a proven technique that you could apply to your engine in order to increase performance.

How does it work? Well, keep in mind that your engine is providing power to more than just the wheels of your car. For example, the alternator, the air conditioning compressor, and the power steering pump are all connected to the engine through a belt and pulley system. Each of those accessories has a small pulley that gets rotated by your serpentine belt that big belt located at the front of the engine. These pulleys take a small amount of horsepower from the engine in order to keep turning and working while you are driving. This is known as parasitic drag.

Now, normally this is not an issue. After all, the amount of energy it takes to turn two or three small pulleys is in the 5 to 7 horsepower range. No big deal, right? Well, when you are trying to squeeze every last drop of performance out of your engine, you should grab whatever you can. If this horsepower is there for the taking, why not scoop it up?

The way to eliminate a substantial portion of this parasitic drag is to install special pulleys that take less energy to turn yet are still capable of running your accessories. These are called underdrive pulleys. The most obvious difference between an underdrive pulley and a standard pulley is that it has a smaller diameter. This makes it so that the pulley does not turn as fast as the stock pulley, meaning that less energy is used in the motion. More importantly, these pulleys are also much lighter than a stock pulley, and the reduced mass makes them far easier to rotate. It is this last feature which gives you the biggest performance gains. Usually you can access about 3 to 5 free horsepower with these devices.

I know what you are thinking if the pulleys are not spinning as fast as they used to, doesnt this mean that my accessories are not going to get the power that they need to work properly? Yes and no. It is usually safe to underdrive your accessories by about 20 percent. If you go below this point, you might start to notice issues like an alternator which does not generate enough electricity to keep the engine running, or a power steering pump that you have to fight against in order to turn the wheels. These issues, when they appear, usually occur only at idle. This is why the 20 percent limit is recommended on a street car. If you are running primarily on the track, where you will see wide open throttle most of the time, then you can take the chance of running a more aggressive set of pulleys that will reduce parasitic drag by a greater amount.

About the Author

Justina Mathews writes issues that currently affect the performance car enthusiast. She also writes about issues that affect the street tuner industry, as well as import scene lifestyle. She's a staff writer for cooling systems.

help on procharging my mustang!?

so heres the deal... i have a 2003 gt mustang that has cold air, full exhaust, and tune with 4.10 gears and 2in lowering ki and short shifter. I want to add power like vortech supercharger. i dont have the money to buy a 03 cobra which i wish i did. so right now i have about 300 horse power. questions are with my set up are...

1. how much power you think i can get buy just adding the procharger (including 39lb fuel injectors, the normal kit that it comes with)

2. will i strip my gears from having 4.10s with out having anything rebuilt in the back

3. and what do i need to do to have a 500 horsepower car with this procharger. is it possible? with minmum upgrades (are cams, heads, rods a must?)

4. what pullies/ underdrive pulley.... maybe blow off valve?

5. whats the safe max psi u think i could run it at running stock. 15psi?

basically im wanting to turn my gt to a 500 horsepower car. what do i need to do.

This is all a guess, but your engine should hold 6 or 7 psi with the stock bottom end. That should net you maybe another 100 or so hp. I think 39# injectors will be too much at this stage. To go up from there, you'll need a new forged bottom end along with other upgrades, but 500 out of a two valve cammer isn't hard. Weather the tranny and/or the rear end hold up depends on the tires. If you slap 10.5" slicks on a 500 hp pony and head for the track, you'll probably spread some tranny parts at the starting line.

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