What makes you think that fits a Viper? And do you really want to slow down the water pump?
From what I have read the 5.9l pulley is the same size stock as the viper and a 25% underdrive what be a 25% on a viper. It did not effect cooling. A few guys on the Vca are running them with no problem. Less wear and tear on the p/s and water pump. Only thing I'm going to try to find is a smaller alternator pulley to keep the charge up
When you use a 25% underdrive everything turns 25% slower so that might effect the charging system. But that is also why you pick up a little power and plus less rotating mass as its a smaller pulley on the crank. I have a sub so I don't want to lower the charging system's capabilities any. All in all we are taking maybe 8-10 rwhp at most.but for 50 bucks and less wear on the p/s and water pump it might not be a bad idea
From what I have read the 5.9l pulley is the same size stock as the viper and a 25% underdrive what be a 25% on a viper. It did not effect cooling. A few guys on the Vca are running them with no problem. Less wear and tear on the p/s and water pump. Only thing I'm going to try to find is a smaller alternator pulley to keep the charge up
If the water pump runs at 75% of the normal shaft speed then IT DOES affect cooling. It may not show on the gauge, or it may not show when those pussies never drive the car above 70* ambient, but a normal summer drive for me...
Damn 111 I don't miss that part of Austin!! Good thing it's about 70 degrees here in San Diego 90% of the year but once the car is moving through the rpms I don't know if it will effect as much as if it was at idle. Which I agree would be where the change for heating up would be.
If the water pump runs at 75% of the normal shaft speed then IT DOES affect cooling. It may not show on the gauge, or it may not show when those pussies never drive the car above 70* ambient, but a normal summer drive for me...
Dave just pick up some water wetter from Douglas engineering... You will be fine
When you use a 25% underdrive everything turns 25% slower so that might effect the charging system. But that is also why you pick up a little power and plus less rotating mass as its a smaller pulley on the crank. I have a sub so I don't want to lower the charging system's capabilities any. All in all we are taking maybe 8-10 rwhp at most.but for 50 bucks and less wear on the p/s and water pump it might not be a bad idea
On a totally unrelated separate point....I sent Mike his Weaver 'overdrive' crank pulley back and am reverting to the stock one for my blower. Not only did it spin the crap out of everything (as designed), the increased belt tension/torque pulled so hard on the A/C clutch that it broke the lower A/C mount on the timing cover. Underdrive=OK. Overdrive with the ROE 10 PSI pulley=bad.
I tracked and street my car with a full set of UDP's. Even sitting in city stoplights and city driving in the middle of the hot FL summer did the car ever run hot. I even had a OEM radiator and thermostat! Sure, the cooling fan would kick on often but it was never a issue.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
but once the car is moving through the rpms I don't know if it will effect as much as if it was at idle. Which I agree would be where the change for heating up would be. 
Linear Mode
