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Old 02-12-2013, 08:42 AM   #1
argofton
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Default GFB Underdrive Pulley Kit for 08+

Has anyone installed this on their car? I have read a lot of reviews for the GFB underdrive kit for the older generations and they all seem to say that the part is of good quality and the engine definitely benefits from it. I see that with this new kit they have changed some things compared to their older version. I am just wondering if anyone has installed this, and if they have, what benefits have they seen? Also, if you have, have you noticed any balance issues or other engine problems that could have been caused by installing this?
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Old 02-12-2013, 10:12 AM   #2
NoGraffix
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do you have a link to said kit? I'm not familiar with it.
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Old 02-12-2013, 10:41 AM   #3
Unabomber
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You have not read http://forums.nasioc.com/forums/showthread.php?t=444518
Buying underdrive is nuts for 18 reasons, buy a lightweight non-underdrive pulley...NOT a kit, JUST the crank pulley. Kartboy.com makes a great one as do others.
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Old 02-12-2013, 11:18 AM   #4
argofton
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I have heard the same exact arguments for and against underdrives from my tuner/mechanic friends. From what I have heard from them, the GFB kit for the new WRX does not underdrive the motor drastically and would be safe unless you are WOT all the time. Also, the total rotational mass savings is significant.

Still wondering if anyone has actually installed this kit.

Here is the link:

http://www.rallysportdirect.com/Go-F...ive-Pulley-Kit
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Old 02-12-2013, 07:15 PM   #5
Unabomber
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Listen carefully to what I say:

Anyone who tells you that there is a significant difference between a Perrin lightweight pulley and a GFB pulley set is a 100% dickweed. Now you can go buy a GFB set and have a terrific life, but I'm telling you after being on this forum and seeing the stories here for 10+ years, that buying ANY underdriven pulley let alone a full set, is nucking futs. The alternator and PS pulleys are a WHORE to remove and when your belt snaps, you'll have long since forgotten the correct belt size and will have to drive you car around with a pantyhose while you figure out what size will fit. This is America....do what you like.
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Old 02-13-2013, 12:03 AM   #6
neomax
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^^^ Listen to him! I've played around with both Underdriven and Lightweight pulleys over the years and I've failed to ever notice any major differences. Throw in all the headaches Unabomber just mentioned and that nice simple lightweight pulley becomes much more appealing.
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Old 02-13-2013, 11:29 PM   #7
WaterfordRex
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Dsport magazine did a test and tune on an '11 sti and saw 5-6 hp gains from 2k rpm almost to red line. Tq output saw 7-8 ft lb gains to red line. They did mention the pain of removing the accessory belt and A/C compressor to install the other pulleys but all of this was done with a Crawford FMIC. Check out their website or magazine. March issue #125.
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