What do they do?

it lessens the amount of effort needed to run your accsesorys.. ie heat,alternator etc

using less of the engines power to run these gives back to the engine so u get back used up HP.

And the underdrive pulley is also lighter than the stock pulley so it is easier to spin as compared to the stock pulley.


current status unknown

http://hometown.aol.com/ohshootuhh/

Perf:
KYB AGX Struts
Neuspeed Sport Springs
5 Strut Bars (2 F/U, F/L, R/U, R/L)
Sprint Front Camber Kit
$15 Rear Camber Kit
Corbin's A/F Gauge
MSD DIS-2 Ignition System
Some Regrind Cams that need High Compression (which I don't have)
Ported Intake Manifold
Ported Throttle Body
Drop in K&N Filter and open airbox
Custom 2 1/2 inch exhaust with Dual DTM Muffler
Empty Catalytic Convertor
Energy Suspension Motor Mount inserts
Hurricane_GS Short Shifter
Symborsky Shift Kit
Clutchmasters Stage 3 Modular
225/50/16inch Wheels and Tires


Audio:
Alpine CD Head Unit
Alpine Flex4 25W X 4 for Fronts and Rears
Alpine V-12 450W X 1 for Subs
Infinity Reference Series 5 1/4 and 1 inch tweeter component systems for fronts and rears
Blaupunkt 3 way 6x9's in the rears
3 MTX 5000 10" 12 ohm subs running 4 ohms mono

it's all physics... the stock pulley is pretty heavy compared to the underdrive pulleys (af/x or unorthodox). These lighter pulleys make it easier for the engine to get them going. It's based on moment of inertia and circular accelleration. But since it has to use less power to get the pulley going, the power is passed along to the wheels which will then make you go faster.

it's like when you twirl an umbrella... the smaller lighter ones are easier to twirl.

Cool, so I want a underdrive pully kit. What is a good one for performance and low on the $$$ = )

AF/F Manufacturing makes a good one, and it is inexpensive comparatively. You can get it from http://www.howellautomotive.com for 160.00 (+ S/H) or if we still get a discount from http://www.ptuning.com then it is around 150.00 (+ S/H).



Eric Madden

Is it ok to use the belt's that come with the AFX pulley, or should I buy some factory one's?

under most circumstances the belts that come with the afx should do just fine.. just make sure they are on nice and tight to avoid any chirping.. some have gone and gotten diff brand belts and if you do a search you should be able to find what the part numbers are.

The stock belts won't fit due to the size difference on the UD pulley. You have to use belts that are the same size as the ones that come with the pulley if you don't use those.



current status unknown

http://hometown.aol.com/ohshootuhh/

Perf:
KYB AGX Struts
Neuspeed Sport Springs
5 Strut Bars (2 F/U, F/L, R/U, R/L)
Sprint Front Camber Kit
$15 Rear Camber Kit
Corbin's A/F Gauge
MSD DIS-2 Ignition System
Some Regrind Cams that need High Compression (which I don't have)
Ported Intake Manifold
Ported Throttle Body
Drop in K&N Filter and open airbox
Custom 2 1/2 inch exhaust with Dual DTM Muffler
Empty Catalytic Convertor
Energy Suspension Motor Mount inserts
Hurricane_GS Short Shifter
Symborsky Shift Kit
Clutchmasters Stage 3 Modular
225/50/16inch Wheels and Tires


Audio:
Alpine CD Head Unit
Alpine Flex4 25W X 4 for Fronts and Rears
Alpine V-12 450W X 1 for Subs
Infinity Reference Series 5 1/4 and 1 inch tweeter component systems for fronts and rears
Blaupunkt 3 way 6x9's in the rears
3 MTX 5000 10" 12 ohm subs running 4 ohms mono