UD Pullies

[FU]

I "think" he makes an aluminum P/S pulley already.

[8upZR1]

I agree, the underdriven pulleys are worth every penny. I fell in love with them during the first test drive. I haven't noticed any of the problems normally associated with slowing things down. Too bad there isn't enough room to hang a large cogged pulley off the snout of the crank.

[1990 quasar blue]

[QUOTE=8upZR1] I fell in love with them during the first test drive.QUOTE]

Can you elaborate?
Thanks

[8upZR1]

Yes, I will elaborate. The HP increase from the pulleys was noticeable enough for me to feel it when I first put them on, which ussually does not happen with a mere pulley swap. I am not saying that I gained 50 HP or anything but the difference was noticeable, particularly when powershifting, as the car had a more violent side to side wiggle. I dunno #'s but it was a pleasant increase especially when considering that there are hardly any bolt ons available for ZR1's, and even fewer are cheap. Also I have not experienced any problems what so ever regarding engine temp or electrical charge. The pulleys I got were also beautifully machined and fit sans hassle. You can not ask for more from a mere peice of aluminum.

[XfireZ51]

I spoke with Marc Haibeck about this last week. He advised against it and didn't think much was gained by it. Has anyone ever quantified the effect?

[Pete]

Dom,just the weight savings on the drive system is worth it.
You can buy the stock size aluminum pullies between the PS,WP & Alternator it's worth 3-4lbs rotating and dead wieght.
If you think 3-4lbs is not that much next time your at the grocery store pick up a 4lb package of sugar.

For the prices parts are going on these cars you couldn't buy stockers for the price of the aluminum pullies.

Pete

[8upZR1]

The GM pieces are retarded expensive, especially if you are replacing all the accessory pulleys. The whole lot, without a crank pulley, will set you back at least a G note.

[1990 quasar blue]

Originally Posted by 8upZR1

Yes, I will elaborate. The HP increase from the pulleys was noticeable enough for me to feel it when I first put them on, which ussually does not happen with a mere pulley swap. I am not saying that I gained 50 HP or anything but the difference was noticeable, particularly when powershifting, as the car had a more violent side to side wiggle. I dunno #'s but it was a pleasant increase especially when considering that there are hardly any bolt ons available for ZR1's, and even fewer are cheap. Also I have not experienced any problems what so ever regarding engine temp or electrical charge. The pulleys I got were also beautifully machined and fit sans hassle. You can not ask for more from a mere peice of aluminum.

Thanks much.