pulleys?
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Joined: Dec 2007
Posts: 32
From: smithfield,n.c.
pulleys?
ok hear it is want to buy a pulley set for my z i like the BBK-1591(part no.) pully because of its finish(polished)but i heard that if you dont have the crank pulley and the alt. pulley i will have a chargeing problem.should i forget bbk and go with Auto Specialties part no.ASP-847601?its about the same price.also i want to get an ac delet pulley will the belts work with all those pulleys will i need a special one?please help
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Joined: Nov 1998
Posts: 71,094
From: Hell was full so they sent me to NJ
What are the under-drive percentages of the two part #'s you mentioned?
You can start with only an under-drive crank pulley. If you experience charging problems, you can add an over-drive alternator pulley. Or, if you had no indication of charging problems, you can add an under-drive alternator pulley. As noted, the gains are minimal, since the LT1 does not drive the water pump with the serpentine belt.
How bad a problem you have will depend on the tranny (A4 idles slower than M6) and any extra electrical loads that you might have added, like an audio system. The fact you are running an electric water pump will increase demands on the electrical system.
You can start with only an under-drive crank pulley. If you experience charging problems, you can add an over-drive alternator pulley. Or, if you had no indication of charging problems, you can add an under-drive alternator pulley. As noted, the gains are minimal, since the LT1 does not drive the water pump with the serpentine belt.
How bad a problem you have will depend on the tranny (A4 idles slower than M6) and any extra electrical loads that you might have added, like an audio system. The fact you are running an electric water pump will increase demands on the electrical system.
Thread Starter
Registered User
Joined: Dec 2007
Posts: 32
From: smithfield,n.c.
I got no idea on the under drive percentage but if you would like you can check them out at summit.com i changed my mind on ac delete a friend talked me out of it, but still looking for pulleys though
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Joined: Nov 1998
Posts: 71,094
From: Hell was full so they sent me to NJ
I don't see any indication on the Summit listings regarding U/D %. You will probably have to go to the BBK and ASP websites to get the %. I do see they are claiming "bolt on 8-15HP", and you will definitely NOT see that kind of gains.
http://www.ws6.com/mod-2.htm
http://www.ws6.com/mod-2.htm
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Joined: Jun 2006
Posts: 2,092
From: lakeville, pa
Originally Posted by www.ws6.com
:
Again I could not feel a power increase in acceleration, but the engine is much more responsive in neutral and when blipping the throttle for downshifts. I makes the engine respond to throttle much quicker. Also, by turning the accessories slower, I am actually saving wear and tear on the alternator, a/c compressor, air pump and power steering pump. The power steering pump on the fourth generation cars is a reverse flow design that is very expensive and is also succeptable to overheating from sustained high RPM use. See my power steering cooler installation to see how to help remedy the problem.
Again I could not feel a power increase in acceleration, but the engine is much more responsive in neutral and when blipping the throttle for downshifts. I makes the engine respond to throttle much quicker. Also, by turning the accessories slower, I am actually saving wear and tear on the alternator, a/c compressor, air pump and power steering pump. The power steering pump on the fourth generation cars is a reverse flow design that is very expensive and is also succeptable to overheating from sustained high RPM use. See my power steering cooler installation to see how to help remedy the problem.
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