13b4me

What are the advantages and disadvantages? Any issues with charging or anything to that effect? Discuss.

arghx

iTrader: (3)

underdrive pulleys are a waste. 20 year old FC's already have pathetic charging systems and you are stressing them further. They spin the accessories (like waterpump, which can cavitate) slower when you are turning high rpm on a race track but that's it

NZ_87_TURBO

Do it!!! they sound mean!!

You wont have any dramas man.

13B-RX3

iTrader: (2)

The tweakit gilmer kit is supposed to be the factory drive ratio. If you get tired of the sound just loosen up the belt a bit and it is much quieter.

arghx

iTrader: (3)

my bad

but I stand by my opinions on underdrive pulleys

13b4me

I was hoping they weren't underdrive, but charging isn't too much of a concern either way. I'll be running an FD alternator that's been rewound for more amperage. If their not underdriven that's even better. No no real downsides?

Black91n/a

Downsides are noise, cost, replacement part sourcing.

Upsides are nothing really. Seriously, you don't need it, teh stock V belts work fine.

13b4me

I would imagine the upside being simplicity. I wanna do something different, and you guys aren't helping me talk myself into this.

RussTII

iTrader: (4)

v-belts like to slip and break at high rpms too.

RotaMan99

I do like the design of the Gilmer set but like arghx you will have negitive effects on your charging system during idle and up to around 1500 rpm.

Unless you are at the track every day, underdrive pulleys will not help you out.

If your vbelt is slipping and breaking at high rpms, then you have another problem on your hands other then the type of belts you using.

riverzendz

As stated above, Gilmer gears are not underdrive gears so there will be no negative charging effects. The upside to them is obviously the look, sound, and certainly no worries of slipping. Downside would be the cost and the belt. I'm not sure what other parts you would have to source...the pulleys are going to fly apart so the only sourcing worry is the belt.

RotaMan99

Does it say that anywhere?

13b4me

Tweakit sells the belts by themselves as well.

Jager

iTrader: (10)

I'de buy it anyways. **** what we think!

13b4me

Good call. I'm getting them.

iceblue

jees people need to learn how to read and quit spouting bull **** like under drive crap. Do you even know wtf the point of an under drive system is for? No so shut up.

If you are not ruing AC and PS want to burn a few dollars get an extra belt go for it. Do what makes you feel good.

RotaMan99

Since you say we don't know, why don't you tell us, if we are spreading misinformation.

papiogxl

iTrader: (6)

The main purpose of an underdrive pulley is to avoid cavitation of the water pump at prolonged periods of high RPM driving. Getting a stock ratio main-alt pulley setup is probably the best for at idle alternator output, having a different ratio will most likely have a negative effect on the voltage at idle.

13B-RX3

iTrader: (2)

I love mine. It was funny to watch my tuner try and figure out where that whining noise was coming from HAHAHA.

BTW if you run the belt too loose weird things happen. Watch the dyno vid in my sig and you can really hear what they sounds like.

13b4me

Wow that's pretty badass.

NZConvertible

You're the last person on this forum who should be telling others this...

They're for race cars, simple as that.

13b4me

Good thing the Tweakit kits aren't underdriven. My car isn't going to be seeing any sustained high RPM driving anyways, so the cavitation isn't much of an issue to me. Just the occasional track day and maybe some 1/4 mile runs. Mostly just a fun, unique street car.

Sindregutt

Buy it and tell us your experience with it

13b4me

I'll buy it, but experiences will have to wait a bit. Car goes down stock for an oil leak, and gets put pack together with a plethora of mods. Months later. That's usually how I roll lol.