Underdrive pulley, any gains on stock - CorvetteForum - Chevrolet Corvette Forum Discussion

Register FAQ Search Today's Posts Mark Forums Read Vendor Directory

C5 Z06 Discussion
General Z06 Corvette Discussion, LS6 Corvette Technical Info, Performance Upgrades, Suspension Setup for Street or Track Sponsored by
PFYC

Underdrive pulley, any gains on stock

Reply
 
 
 
Thread Tools Search this Thread
Old 01-12-2014, 06:28 AM   #1
Medic949
Junior Member
Thread Starter
 
Member Since: May 2013
Posts: 14
Thanks: 0
Thanked 0 Times in 0 Posts
Default Underdrive pulley, any gains on stock

I'm looking at optimizing the power of my stock 2002 Z06. I have seen under drive pulley upgrade packages claiming increase in power. Is there any truth to this and is the power increase worth the money?
Medic949 is offline   Reply With Quote
Old 01-12-2014, 01:05 PM   #2
PeteZ06
CF Senior Member
St. Jude Donor '07-'08-'09-'10-'11
 
PeteZ06's Avatar
 
Member Since: Mar 2004
Location: Bartlett IL
Posts: 4,405
Thanked 8 Times in 8 Posts
Default

I think its good for 3-5 rwhp... I remember a few people dynoing their cars before and after installing an ASP underdrive pulley many years ago and that was the average. I ran one on my previous cars... not even sure if they make one for the LS7.. something I should look into myself.
PeteZ06 is offline   Reply With Quote
Old 01-12-2014, 03:10 PM   #3
0H1Z06
CF Senior Member
 
0H1Z06's Avatar
 
Member Since: Mar 2006
Location: Anna "pfho Pfanna" TEXAS
Posts: 9,443
Thanked 105 Times in 92 Posts
Default

I purchased one for my current 414ci.... Powerdyne...

IMO if you are going to change out UD pulley you may as well throw a cam up in there...

Quote:
Originally Posted by PeteZ06 View Post
I think its good for 3-5 rwhp... I remember a few people dynoing their cars before and after installing an ASP underdrive pulley many years ago and that was the average. I ran one on my previous cars... not even sure if they make one for the LS7.. something I should look into myself.
0H1Z06 is offline   Reply With Quote
Old 01-12-2014, 07:08 PM   #4
PeteZ06
CF Senior Member
St. Jude Donor '07-'08-'09-'10-'11
 
PeteZ06's Avatar
 
Member Since: Mar 2004
Location: Bartlett IL
Posts: 4,405
Thanked 8 Times in 8 Posts
Default

Quote:
Originally Posted by 0H1Z06 View Post
I purchased one for my current 414ci.... Powerdyne...

IMO if you are going to change out UD pulley you may as well throw a cam up in there...
You mean a real cam?

My LS7 is heads and cam but just a super small cam, I ran aggressive cams for too long in my previous cars that I really just wanted something tamer this round. Maybe one of these days I'll put in a healthy cam, get a LSX intake and drop my cats and break the 600+rwhp mark
PeteZ06 is offline   Reply With Quote
Old 01-13-2014, 08:59 AM   #5
0H1Z06
CF Senior Member
 
0H1Z06's Avatar
 
Member Since: Mar 2006
Location: Anna "pfho Pfanna" TEXAS
Posts: 9,443
Thanked 105 Times in 92 Posts
Default

you know what I meant PeteZ06....
I am opting for the aggressive cam, ported LSX intake, different fuel system, TEA's, Calloway Honker... etc, blahze,... I am chasing the 600 mark that you speak of.... Sorry to get off topic to the OP....

A "pulley" will be nice.... and inexpensive...



Quote:
Originally Posted by PeteZ06 View Post
You mean a real cam?

My LS7 is heads and cam but just a super small cam, I ran aggressive cams for too long in my previous cars that I really just wanted something tamer this round. Maybe one of these days I'll put in a healthy cam, get a LSX intake and drop my cats and break the 600+rwhp mark
0H1Z06 is offline   Reply With Quote
Old 01-13-2014, 12:53 PM   #6
williamb81
CF Senior Member
 
williamb81's Avatar
 
Member Since: Feb 2013
Posts: 102
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I just installed one on my hot rod. Ill post the hp gains in a week or two.
williamb81 is offline   Reply With Quote
Old 01-14-2014, 10:47 PM   #7
ptindall
CF Senior Member
 
ptindall's Avatar
 
Member Since: Aug 2006
Location: Picking on the weakest kid in the yard.
Posts: 22,055
Thanked 27 Times in 11 Posts
Default

I installed one when my stock one started wobbling and threw the belt. I don't have a before and after dyno but I will say there was no negative side effect.
ptindall is offline   Reply With Quote
Old 01-15-2014, 09:05 AM   #8
Moto One
CF Senior Member
 
Moto One's Avatar
 
Member Since: Sep 2006
Location: Truckee CA
Posts: 861
Thanked 23 Times in 23 Posts
Default

I have always thought that the reason for under drive pulleys was so that you don't damage the alt/ac compressed from extended hi RPM runs. I was also told that if you are using your car for daily driving (commuting ect) you run the risk of not getting enough spin on the alt to properly keep the charging system at need levels.

Mark.
Moto One is offline   Reply With Quote
Old 01-15-2014, 09:50 AM   #9
Scooter70
CF Senior Member
 
Scooter70's Avatar
 
Member Since: Oct 2001
Location: The Motor City
Posts: 4,731
Thanked 30 Times in 20 Posts
Default

Is 3-5hp worth the hours of labor to just install a damper? (You need to move the steering rack out of the way to change the crank pulley. If you haven't done that yet, it's a pain in the a$$.) Like stated above, if you're going in that deep, you might as well spend the extra hour or two and swap the cam (and springs... and pushrods... and injectors.... and put on a FAST 92 and LS2 throttle body... and AFR heads....).

It's a never-ending series of "while I'm at it...".
Scooter70 is offline   Reply With Quote
Old 01-15-2014, 12:38 PM   #10
skyavonee
CF Senior Member
 
skyavonee's Avatar
 
Member Since: Jul 2010
Posts: 2,936
Thanked 13 Times in 9 Posts
Default

Quote:
Originally Posted by Scooter70 View Post
Is 3-5hp worth the hours of labor to just install a damper? (You need to move the steering rack out of the way to change the crank pulley. If you haven't done that yet, it's a pain in the a$$.) Like stated above, if you're going in that deep, you might as well spend the extra hour or two and swap the cam (and springs... and...

It's a never-ending series of "while I'm at it...".
skyavonee is offline   Reply With Quote
Old 01-15-2014, 01:53 PM   #11
ptindall
CF Senior Member
 
ptindall's Avatar
 
Member Since: Aug 2006
Location: Picking on the weakest kid in the yard.
Posts: 22,055
Thanked 27 Times in 11 Posts
Default

Quote:
Originally Posted by Moto One View Post
I was also told that if you are using your car for daily driving (commuting ect) you run the risk of not getting enough spin on the alt to properly keep the charging system at need levels.

Mark.
That and the water pump and power steering pump also turns slower opening the possibility of poorer engine cooling and insufficient pump pressure or volume when turned the wheel quickly. However, having done this mod, I can tell you that none of these occured for me.
ptindall is offline   Reply With Quote
Old 01-15-2014, 07:46 PM   #12
PRE-Z06
Supporting Vendor
 
PRE-Z06's Avatar
 
Member Since: Dec 2006
Location: Fort Worth, Texas
Posts: 6,495
Thanked 14 Times in 11 Posts
Default

Quote:
Originally Posted by Medic949 View Post
I'm looking at optimizing the power of my stock 2002 Z06. I have seen under drive pulley upgrade packages claiming increase in power. Is there any truth to this and is the power increase worth the money?
Depends on how much they are underdriven and how much lighter, but I'd say ~3-8rwhp higher side being 25% reduction compared to 10%.
__________________
http://www.youtube.com/watch?v=wNb3maKeytI
http://www.youtube.com/watch?v=vg1OX90xbWY
~422rwhp+Monster Level 2/4.10=60'-1.49 1320'-10.99/125.5
Best mph-127.1


~520rwhp 6.0+LT1S/3.42=60'-1.56, 660'-105.9mph, 1320'-132.5 with headwind and 0' DA



PRE-Z06 is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • Underdrive pulley, any gains on stock
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    Smaller Pulleys = more power? caryb78 C3 Tech/Performance 12 10-17-2015 08:53 AM
    Crank Pulley gonabite C6 Corvette ZR1 7 03-26-2012 11:57 AM
    Under versus Over drive balancers TKT-MKR C5 Forced Induction/Nitrous 9 05-30-2010 06:29 AM
    Power Steering Pump PULLEY VettesandZs C5 General 11 05-25-2010 09:58 PM
    what's the best underdrive pulley set for c4 corvette and is it worth the money turbotim23 C4 Tech/Performance 13 08-06-2009 02:29 PM


    Thread Tools Search this Thread
    Search this Thread:

    Click for 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

    Forum Jump


    All times are GMT -4. The time now is 09:50 AM.