25% underdrive pulley
25% underdrive pulley When I did my cam,valve springs and headers I installed a 25% underdrive crank pulley.My car is running about 20° warmer now at highway speed and idle.Are any of you guys seeing the same thing?
Last edited by Pro Street; Jan 20, 2008 at 03:42 PM.
TECH Senior Member
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From: Western Burbs of Detroit
When my asp u/d pully was installed I also had the Meziere EWP installed. I saw nothing but cooler temps. Especially at highway speeds. What T stat you running, and what Temps are your fans programmed to come on at ?? BTW did you see an improvement in gas mileage ?? I know I did. 
TECH Senior Member
iTrader: (3)
Joined: Apr 2006
Posts: 6,524
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From: Western Burbs of Detroit
Cancel the stat question, I should've read your sig. Sorry. Make sure you don't have any obstructions, or damage to your radiator. Is your coolant level at full ??
186°.Coolant is full.I have my tune just about done so it is running great.
Check and make sure you got all the air out of the coolant system. You could have some air in the system causing the car to run hotter than usual. Also maybe you could put in a new t-stat, the new one may not be opening all the way up, hurting flow. How about belt slippage, make sure the belt is on right.
