Underdrive Pulley: Which one should I choose? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 07-05-2004, 10:20 PM   #1
Senior Member
True Car Nut
Thread Starter
 
Join Date: Oct 2002
Location: Genoa, Illinois
Posts: 4,013
Thanks: 0
Thanked 0 Times in 0 Posts
Allmachtige is on a distinguished road
Default Underdrive Pulley: Which one should I choose?

Ok I'm going for one of these: http://www.zzperformance.com/zzp/pro...ive_pulley.htm

Either the water pump or alternator 10% underdrive pulley. Why not go for both? Well that would require a larger belt to do both and changing the belts on an L67 does not favor my brain. Besides, I'll be getting rockers in the winter so I'll have all the top end I'll want then.

I'm leaning towards the water pump pulley because it is so ungodly easy to swap out, while the alternator pulley is more of pain to me (even more if it goes bad and I have to install a new one). However which one do you think would I benefit more from?

Also one more slight issue, does the GP have a motor mount bracket in the same location as a Bonnie, because just look at the low clearence in these pictures:


Allmachtige is offline   Reply With Quote
Old 07-06-2004, 12:15 AM   #2
Senior Member
Certified GM nut
 
Join Date: Jul 2003
Location: Chicagoland
Posts: 1,712
Thanks: 0
Thanked 0 Times in 0 Posts
TaylorD is on a distinguished road
Default

Well I don't like the idea of slowing the water pump, maybe it pumps faster than needed but I'd like the most amount of coolant circulating to keep temps down.

And for the Alt. pulley, I've never used one, but you for sure won't see an underdrive Alt pulley on my ride, My electrical load is a just a little bit above stock I need all the Volts I can get.

But for those with stock stereos and not above normal electrical load required, I'd say go for it. Get the 10% underdrive. Does your 98 have Volt gauge? Just curious. IF you do keep an eye on it and compare before and after with it.

I do agree with the fact that they are all lighter pullies, less weight rotating is more power made, Can't arguee that one.

If your going for more pullies why not go for the 8-rib conversion?
http://www.zzperformance.com/zzp/pro...ion_pulley.htm
I thought it was light weight but dosen't say, sure will get no slipage though.
TaylorD is offline   Reply With Quote
Old 07-06-2004, 12:42 AM   #3
Senior Member
Certified Car Nut
 
Join Date: Jun 2003
Posts: 15,928
Thanks: 0
Thanked 0 Times in 0 Posts
BonneMeMN is on a distinguished road
Default

SSEi'* dont' have a Voltmeter, they have a Boost gauge instead in the 92-99 cars Taylor.

Running the alt slower may make it last longer, but you'll loose amps. I dunno if i'd do that in an sse/ssei car, or anything with a Deck or more.

And cooling, i wouldn't sacrafice that either. Especially on a modded engine.

GP'* have the front motor mounts. from the rad top to the engine.
BonneMeMN is offline   Reply With Quote
Old 07-06-2004, 12:46 AM   #4
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

My understanding is that our water pumps cavitate in the OEM configuration. The 10% ZZP pulley is designed to prevent this, and actually improves cooling effieciency as a result. Just something I read, don't remember where.
willwren is offline   Reply With Quote
Old 07-06-2004, 08:23 PM   #5
Senior Member
Certified GM nut
 
Join Date: Jul 2003
Location: Chicagoland
Posts: 1,712
Thanks: 0
Thanked 0 Times in 0 Posts
TaylorD is on a distinguished road
Default

Quote:
Originally Posted by BonneMeMN
SSEi'* dont' have a Voltmeter, they have a Boost gauge instead in the 92-99 cars Taylor.
Didn't know if you did, us +00 do have both

Interesting on the pulleys though, don't really want any of the tradeoffs, want to know more about the WP one though, someboy has to of tested it.

Surprised there'* not a full light weight set available.
TaylorD is offline   Reply With Quote
Old 07-07-2004, 12:09 AM   #6
Senior Member
True Car Nut
Thread Starter
 
Join Date: Oct 2002
Location: Genoa, Illinois
Posts: 4,013
Thanks: 0
Thanked 0 Times in 0 Posts
Allmachtige is on a distinguished road
Default

I'll be testing the WP pulley later this week for ya guys.

I don't think its going to clear our motor mount bracket though...we'll see.
Allmachtige is offline   Reply With Quote
Old 07-07-2004, 12:41 AM   #7
Senior Member
True Car Nut
 
Join Date: Feb 2003
Location: Bloomington-Normal, IL 1997 SE
Posts: 3,734
Thanks: 0
Thanked 0 Times in 0 Posts
macho_mike21 is on a distinguished road
Default

i thought the reason we dont have lightweight pulleys for everything was due to the fact that the motor was internally balanced or somehting like that.
macho_mike21 is offline   Reply With Quote
Old 07-07-2004, 12:48 AM   #8
Senior Member
Certified Car Nut
 
Join Date: Jun 2003
Posts: 15,928
Thanks: 0
Thanked 0 Times in 0 Posts
BonneMeMN is on a distinguished road
Default

I think they meant lightweight aftermarket pulleys. They'll still have less mass to rotate. It all adds up. You'd be surprised at how much the cam/valvetrain sucks from total output, let alone an SC.

If the stock WP cavitates in stock config it'* not flowing all that it could. Running just under cavitating would flow the most.
BonneMeMN is offline   Reply With Quote
Old 07-07-2004, 08:56 PM   #9
Senior Member
Posts like a Turbo
 
Join Date: Aug 2002
Location: Funky Town, Texas
Posts: 333
Thanks: 0
Thanked 0 Times in 0 Posts
Bigfunkytown is on a distinguished road
Default

I have both a GP and a Bonneville. Both powerd by the L36. The info I have is that the waterpump pulleys work on the GP, but don't work on the Bonne due to the very bar you are discussing here. Its a shame to because my GP picked up .127 in the quarter mile trap times with the 10% and the underdrive pulley. I would suggest that you pick up the lightend water pump pulley that ZZP offers. I myself plan on doing this. The whole point is to lighten up the rotating mass thus freeing up HP. Hope this helps.
Bigfunkytown is offline   Reply With Quote
Old 07-07-2004, 11:03 PM   #10
Senior Member
True Car Nut
Thread Starter
 
Join Date: Oct 2002
Location: Genoa, Illinois
Posts: 4,013
Thanks: 0
Thanked 0 Times in 0 Posts
Allmachtige is on a distinguished road
Default

Little late for that, its in my hands.
Allmachtige is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
ZZP underdrive alternator pulley JuniorCar Performance, Brainstorming & Tuning 16 06-07-2010 10:34 AM
water pump underdrive pulley its840 Performance, Brainstorming & Tuning 9 09-06-2006 07:04 PM
Stupid underdrive pulley question Jack Performance, Brainstorming & Tuning 1 10-07-2005 09:50 PM
Will a ZZP water pump underdrive pulley work for series 1??? jgs11 Performance, Brainstorming & Tuning 22 10-04-2004 01:15 PM
Underdrive pulley has proven results Allmachtige Performance, Brainstorming & Tuning 3 09-13-2004 08:57 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 04:45 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.