New LS1 Owners - Newbie Tech - Underdrive pulley question LS1
09-27-2009, 09:05 PM
I am going to put an Underdrive pulley on my Wife's 99 T/A. It is my understanging that the crank on a LS-1 is not keyed. How do I line up the new pulley?? Can it just go on anywhere? I am assuming this thing is nuetral balanced. It is a SLP underdrive pulley if it matters.
09-28-2009, 07:22 AM
Goes on anywhere.
Just get the proper puller, use a lil trans oil and make sure it seats fully.
Did you put a cam in it yet?? If not I would consider it now as it is a double job if you do it down the line.
09-28-2009, 06:49 PM
No the crank isn't keyed. The balancer may be marked with timing lines but that would be up to you whether you line those up for future use later. I just stuck mine on and didn't worry about the marks.
09-29-2009, 01:35 AM
Sorry to jack thread but if you replace UD pulley what all else would you need to change as not to change anything else like alternator output and such?
10-21-2009, 08:40 PM
put a smaller pulley on the alt
10-21-2009, 09:29 PM
You need a pulley bolt as factory is TTY and I changed no accesory pulleys but because of my cam I idle a litte higher. I still don't think it necassry though. Also will need a shorter serpentine belt...
10-21-2009, 11:08 PM
If you have an A4 and idle is still stock, you charge may drop a little at idle especially with lights, and AC on but no biggie. I didn't put an OD Alt pulley on when I did mine because I plan on doing a cam and will have it tuned for it at that time.
10-23-2009, 07:20 AM
is the the lower pulley a harmonic balancer also ?
10-23-2009, 05:53 PM
yes and no LS1's are internally balanced
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