Really Light Stuff - Alternator Underdrive Pulley

[Thomasio]

TBA: RLS Alternator Underdrive Pulley

- increase the life of your expensive alternator
- decrease the parasitic drag caused by your alternator
- aircraft aluminum
- hard coat anodized for long life and corrosion resistance
- MSRP: $105

Pre-order now.

[More details to follow.]

[Dave]

Being underdrive I assume it's a different diameter too?

[Thomasio]

Originally Posted by Dave

Being underdrive I assume it's a different diameter too?

Exactly... they are larger diameter so that they spin slower. For cars that spend a good amount of time at the track, it's a nice modification.

[Dave]

Belt change? Size?

I'm interested.

[Thomasio]

Originally Posted by Dave

Belt change? Size?

I'm interested.

May require a belt change, it will depend on whether you have a stock sized intercooler pulley or not. Details to follow.

[EricH]

With a/c blower on high, all lights on (including brake pedal depressed) and at stock idle, can you give us idea of charge rate on the battery? Is it in discharge or still charging?

I realize with under drive pulleys sometimes you will be in discharge and that isn't horrible, just want to know the details. For those of us in Texas.. that might get stuck in traffic.

[Thomasio]

Originally Posted by EricH

With a/c blower on high, all lights on (including brake pedal depressed) and at stock idle, can you give us idea of charge rate on the battery? Is it in discharge or still charging?

I realize with under drive pulleys sometimes you will be in discharge and that isn't horrible, just want to know the details. For those of us in Texas.. that might get stuck in traffic.

That's a good question... my guess is that it will not be charging at idle. I'll have an answer for you in a couple of weeks. Testing different sizes.