uderdrive pully question
Thread Starter
Melting Slicks
Joined: Mar 2000
Posts: 2,975
Likes: 1
From: Northwest Iowa
uderdrive pully question
Ok. I don't know a lot about what it does or how it works, but I gather from other comments and posts that it can increase power output. Can someone enlighten me.
How hard of a job is it to change?
I assume a different belt is needed (anything else other than the pulley and belt)?
What can you expect as to increase HP output at the wheels?
Does the car need to be re-tuned for this modification?
Is the car good for daily driving with a different pulley or does it need to be changed back for driving other than at the track?
Thanks very much for the info
How hard of a job is it to change?
I assume a different belt is needed (anything else other than the pulley and belt)?
What can you expect as to increase HP output at the wheels?
Does the car need to be re-tuned for this modification?
Is the car good for daily driving with a different pulley or does it need to be changed back for driving other than at the track?
Thanks very much for the info
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
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From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Originally Posted by HawkIVette
Ok. I don't know a lot about what it does or how it works, but I gather from other comments and posts that it can increase power output. Can someone enlighten me.
How hard of a job is it to change?
How hard of a job is it to change?
Originally Posted by HawkIVette
I assume a different belt is needed (anything else other than the pulley and belt)?
Originally Posted by HawkIVette
What can you expect as to increase HP output at the wheels?
Originally Posted by HawkIVette
Does the car need to be re-tuned for this modification?
Originally Posted by HawkIVette
Is the car good for daily driving with a different pulley or does it need to be changed back for driving other than at the track?
EG
Last edited by EG@EnglandGreen; Dec 18, 2005 at 10:34 PM.
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
Likes: 39
From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Originally Posted by HawkIVette
Man that is a very good reply. Thanks for all the info. 
Team Owner
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I had my my underdrive pully changed when I put the new cam 
in.
I drive my vette daily and no problems.
in. I drive my vette daily and no problems
.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Originally Posted by EnglandGreen
Almost the same as doing a cam - big job. steering rack removed, radiator, et al.
:
:
There is no comparrison of a cam change to the UD pulley. I did all my own work and that included the pulley on its own and changing cams.
For the pulley, you only move the steering rack to the passenger side but not out of the car and the Air cleaner/airbridge so you have access to moving a huge tq wrench/breaker bar. Radiator DOES NOT come out. 3 hours at best
The cam change adds:
fans
radiator
water pump
timing cover
oil pump unless you trust the dots lining up without a good view
coil packs
valve covers
rocker arms
pushrods
something to hold up the lifters or prayer
plugs/wires
TB recommended for access
Valve springs if you have the stock ones still in there
15 hours (add 2 hours for springs)... If that looks like the same size job to you....
Last edited by SpinMonster; Dec 19, 2005 at 02:54 AM.
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
Likes: 39
From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Good luck with a tight pulley bolt with the water pump, cooling fans and radiator in the way. Also, good luck if you have a tight pully that requires better access to extract.
By all means assume it is a simple job, until you run into unforeseen issues. A cam install is not a big deal and the vast majority of time is spent getting stuff out of the way to get at the cam. It's a 7 hour job if you are organised.
By all means assume it is a simple job, until you run into unforeseen issues. A cam install is not a big deal and the vast majority of time is spent getting stuff out of the way to get at the cam. It's a 7 hour job if you are organised.
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