Underdrive pulley kit

[matt sorrentino]

Hello all, I wanted to know what options are out there for an underdrive pulley kit for my 94 Silverado 350 TBI. Any gains? Any recommendations? Thanks in advance

 

[99'Subourbon]

From what I have read previously, nothing really to be gained by doing so. I think it also causes you other drive accessories not to work as well, or have to work harder?

 

[matt sorrentino]

Well I was reading that what they do is slow down al the accessories to allow the engine to have more power. They swear up and down that it doesn't affect the normal operation of the components. For the kit is about $149 so I might give it a shot. Mostly I'm looking for people that already have installed a kit

 

[someotherguy]

Listen to the sound of $149 wasted: "..."

Richard

 

[Ironhead]

If this kit would produce more power, and/or better fuel mileage, you can bet the factory would have designed the pulley system this way.

The situation where an underdrive could be beneficial, is if you consistently operate your engine at high RPMs, say over 4500 most of the time. Then, it makes sense to slow down the alternator, PS pump, AC compressor, etc.

Otherwise, kiss your money goodbye!

 

[df2x4]

In addition to what the others have said, these kits almost always cause idle charging issues with factory alternators. They work fine when you're driving around, but at idle they won't spin the alternator pulley fast enough to keep up with the drain on the battery. Not an issue for some people's driving habits, but definitely not something I'd ever do to one of my trucks.

 

[someotherguy]

Plenty of people complain about the heavy steering feel at low speed in a pre-1997 GMT400 as well. Imagine that with a power steering pump that is spinning slower than normal.

Richard

 

[matt sorrentino]

Alright guys thanks for the imput I'll save that money to go towards something else