Just was looking to buy aftermarket pullies but just want to make it a bolt-on kinda installation, which kit is like this.

 

theres going to be some arguing here becuase some say its not worth it to use underdrive pulleys becuase theres almost no power gain and it could **** your water pump up. but thats what ive always read about on here...

 

I've never heard of it not being ideal for the water pump... the water pump cavitates whenever you push over 6k rpm anyway, the water pump underdriven would be a good thing.

The s4 alternator however is just 70 amps, which basically makes an underdrive pulley on the alternator wear out your alternator and not supply enough amps considering stereo/ecu/spark/lights/wipers.

 

That's only at idle.

If you are pimping the boulevard and stitting in your car while blaring your sound system and trying to pick up 15 year old chicks...then yes - an underdriven alternator is a bad idea.

If you drive your car and do not subscribe to the 'Pimp my ride' MTV manefesto so many not-so-genetically-gifted people do - you'll be fine. With a properly working charging system, vehicle power/ground connections, and good battery; underdrive pulleys will not hurt a thing.

 

"not-so-genetically-gifted people"

 

I wish someone would make just an underdriven water pump pully,.. i know mazdacomp makes one but its only single sheeve,...

 

water starts to cavitate....

 

Just bump your idle a little with the underdrive pulley. An extra 100-150rpm will do any old tired electrical system good even if you don't underdrive.

 

And how long does a street car spend above 6,000rpm? Not enough to matter! Underdrive pullies are for race cars, not street car. All you're doing is reducing capacity of both the charging and cooling systems.

 

but you get 1.5 horsepower!!! if you want the big gains with an underdriven pulley setup what you need to do is get a big vynal sticker made to go acorss the top of ur windshield that says UNDERDRIVEN

 

Modded NA's spend all their time above 6k during "spirited" street driving.

 

BS.

 

My NA did lol and was some how completely missing the oil seal on one of the rotors when we broke it open lol, Mysterioso!!

 

Why does every pulley turn into a debate?
**** the pros/cons.

Mazdatrix/Racingbeat/MMR/rotorsportsracing/shaneracing/.......have pulleys.
If you only want a water pump pulley, buy the set and just use that one. Too bad UR doesn't have any in stock anymore.

I haven't seen any back to back dyno comparisons for pulley comparisons. But, on an NA, other then header install & cat removal, just about any other mod doesn't give too much power. So, every increment helps.