SLP Underdrive Pulley
I put one on my 02 SS and it did make a difference but don't know how much. My car dynoed 318rwhp then i did the SLP underdrive pulley & SLP mass air & P&P Throttlebody and then made 333rwhp so i would say atleast 8rwhp.
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From: Massachusetts
As far as I know, the SLP UDP is made by powerbond. Save yourself some cash and buy one of those. Also even if the pulley added no HP, it would still lower the rotational mass. Faster revs = reaching powerband faster. I am NO expert though.
I installed a ASP pulley, didnt really notice a difference except it reved up a little quicker. No gains at the track either, but it wasnt hard to install at all. It gave me a reason to change the antifreeze while I was at it.
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QUOTE=2000WS6ICK;10514164]Is a SLP underdrive pulley worth the $$$$? Who has one and what are the gains of having one?[/QUOTE]
i have an slp underdrive pully installed and i could not believe that other companys were offering ones made out of aluminum thats the last place i would put aluminum .so i put on the slp underdrivepully(Steel) whice now i get decent gas milage around town and i got rid of that rusty old stock pice which in comparison of the new one is almost 3 times the size ! im0 if u have a cam on youre next oil change it just might be a good idea too change the oil and belts anyways thats what i did knock 5 birds out with 1 stone..
i have an slp underdrive pully installed and i could not believe that other companys were offering ones made out of aluminum thats the last place i would put aluminum .so i put on the slp underdrivepully(Steel) whice now i get decent gas milage around town and i got rid of that rusty old stock pice which in comparison of the new one is almost 3 times the size ! im0 if u have a cam on youre next oil change it just might be a good idea too change the oil and belts anyways thats what i did knock 5 birds out with 1 stone..
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Any of the UD pulleys will work. Remember the UD pulley typically has a 25% reduction. All the pulleys work the same in this area. The difference in pulleys is the SFI cert and type of construction.
http://www.slponline.com/view_product.asp?P=100221
NOTE: Requires 2 new belts (Gates #K060763 and #K040378 or equivalent, not included). For LS1 F-Bodies only.
Goodyear Belts 4060760 & 4040372 I believe will work also.
You can't lose with either one. Gates is a well-respected name.
I've got the Goodyear here, & have run them for about 6months with no issues.
One good selling feature about the SLP pulley is the 'high-walls', so it's less likely to throw a belt.
Last edited by PontiacFan; Nov 18, 2010 at 08:51 AM.
We have them on sale here-
http://marylandspeed.com/advanced_se...eywords=100221
I always saw this as a mod you do while doing a cam. On it's own it may not be worth the hassle.
http://marylandspeed.com/advanced_se...eywords=100221
I always saw this as a mod you do while doing a cam. On it's own it may not be worth the hassle.
The only one I found Selling Gates Belts was Jeggs and Amazon...Summit Doesnt sell them...called SLP they didnt recomend the Gatorback...cause it wasnt tested thith the pulley they tested it with Gates.
Last edited by bigboykilroy; Jan 16, 2009 at 08:37 AM.
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From: fenton, MO
underdrive pulley i put the ASP underdrive pulley on mine as well and i cant tell you exactly what gain it makes becuase i put it on with a lot of other mods but as stated above it prolly makes about 8rwhp and it does rev quicker.
Bringing this back from the dead, because it bit me in the butt.
The previously recommended gatorback belt 4040327, at 32.75 inches, is too short for the AC belt.
The last 3 digits correspond to the length of the belt.
The gatorbacks you want to order are:
4060760=76.0 inches, main belt (summit shows same length as x763, but 7 bucks cheaper.)
4040372=37.2 inches, AC belt (summit does not currently show length for x378, but by my math will be .5 inches longer.)
when in doubt, cross-reference another manufacturer, or read the instructions.
...I knew better.
The previously recommended gatorback belt 4040327, at 32.75 inches, is too short for the AC belt.
The last 3 digits correspond to the length of the belt.
The gatorbacks you want to order are:
4060760=76.0 inches, main belt (summit shows same length as x763, but 7 bucks cheaper.)
4040372=37.2 inches, AC belt (summit does not currently show length for x378, but by my math will be .5 inches longer.)
when in doubt, cross-reference another manufacturer, or read the instructions.
...I knew better.