PDA

View Full Version : tC Underdrive Pully


tCfrk86
03-10-2008, 12:43 PM
Does this look like a cheap underdrive pully and if not should i get it?
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=350033272548&_trksid=p3984.cWAT.m240.lVI
hawgs74
03-10-2008, 01:01 PM
I wouldnt... And if your going to add a S/C then you dont want an underdreive pulley. I recommend Non Stop Tuning Light weight pulley
tCfrk86
03-10-2008, 01:09 PM
I prolly won't have the supercharger for a while, maybe not till this summer or so. What about the waterpump pully and Alternator pully for it?
hawgs74
03-10-2008, 01:18 PM
I run all three pullies and I like the result. The whole set reduces about 2.3 pounds of rotational mass under the hood. Revs come up so fast 1st gear is almost non existant
tCfrk86
03-10-2008, 04:32 PM
What kind of power improvements are you seeing?
fightinsk8ers
03-10-2008, 04:44 PM
faster REV!
JoshCrane1
03-11-2008, 09:10 AM
I run all three pullies and I like the result. The whole set reduces about 2.3 pounds of rotational mass under the hood. Revs come up so fast 1st gear is almost non existant
sure about those numbers? i have the agency lightweight crank pulley and its like 6 pounds lighter than stock.
JoshCrane1
03-11-2008, 09:13 AM
What kind of power improvements are you seeing?
faster rev!!!, but u will get a lil cabin vibrations due to eliminating your engine dampening.( rubber and weight from stock pulleys.)
hawgs74
03-11-2008, 09:23 AM
sure about those numbers? i have the agency lightweight crank pulley and its like 6 pounds lighter than stock.

Agency pulley is 3.5lbs lighter than stock. Not 6 :cop:
JoshCrane1
03-11-2008, 10:29 AM
Agency pulley is 3.5lbs lighter than stock. Not 6 :cop:
cool, i wasnt sure, but it still proves my point that a full pulley set will drop more than 2.5 pounds. probably more like 6.
tCfrk86
03-11-2008, 02:08 PM
faster rev!!!, but u will get a lil cabin vibrations due to eliminating your engine dampening.( rubber and weight from stock pulleys.)

Do you have an auto or manual?
hawgs74
03-11-2008, 03:12 PM
cool, i wasnt sure, but it still proves my point that a full pulley set will drop more than 2.5 pounds. probably more like 6.

Weight and rotational mass are not the same thing...

But the NST set WEIGHS 3.75lbs less than stock.
JoshCrane1
03-11-2008, 03:34 PM
Do you have an auto or manual?


Weight and rotational mass are not the same thing...
i have a manual,

and to avoid a physics debate where i break down newtons and how its applied to inertia(implied as rotational mass here), i will just say.. in this context, and here on earth, mass IS weight and putting rotational in front of mass doesnt change the fact that we are talking about spinning WEIGHT.

but for argument sake, what unit is used to measure rotational mass?
tCfrk86
03-13-2008, 07:55 PM
Thanks bro.