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Old 08-04-2011, 03:37 AM   #1
Scooby Specialist
Member#: 11654
Join Date: Oct 2001
Location: DE, Happy Valley
2002 WRX Sedan
WR Blue

Default Group-N Mounnts (E & T), Perrin MC Stiffi, Kartboy Bushings

Hey Guys,

I've been meaning to do the Group-N Engine and Transmission mounts for years now and I'm finally getting around to doing some more work to my car (02 WRX). A few people have recommended I do the Group-N E &T mounts but I'm not entirely sure why and what they do. I'd assume they keep the engine and trans much stiffer and in place so it doesn't feel as sloppy.

I also read in a post somewhere that it really helps with comfort in terms to your passengers heads swinging forward on every damn upshift - would you guys agree with that? I know since it is stiffer more vibrations will be transmitted into the car but I've done pretty extensive sound deadening so I'm not too concerned with any added vibrations.

I've also been looking into increasing my braking performance as my summer spirited driving often gets my brakes pretty soft. I know this won't help keep my brakes cool or anything, but is the Perrin Master Cylinder Stiffi worth installing? What is the overall benefit of upgrading the MC mounts?

Lastly and not really the right section, my old Perrin Crank pulley is bent or something and not spinning correctly - what would you guys recommend I replace it with? I really want to keep some aftermarket part as it already takes long enough for my VF30 to spool!


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Old 08-04-2011, 06:21 AM   #2
Scooby Specialist
Member#: 271525
Join Date: Jan 2011
Location: BagEnd
7/2 STi/WRX wagon


Yes, do the Group N mounts.

Prior to a master cylinder brace I'd think about upgraded pads and fresh, upgraded fluid.

Your crank pulley being "bent or something" is an issue I'd fix right away. If you want aftermarket get Cobb or Kartboy but it isn't going to help your turbo spool.
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Old 08-04-2011, 11:02 AM   #3
Scooby Specialist
Member#: 237145
Join Date: Feb 2010
Chapter/Region: SCIC
Location: 562
02 WRX
12 FXT


Yes they will increase the vibrations to your gear shifter by a negligible amount. It decreased the vibrations to the cabin. The softer they are the more movement and that is more force. Think newton's Force = Mass * Acceleration with a spring attached to a weight. Kinda like a mass tuned dampener for a cruise liner or seismic retrofit for a sky scraper.

The perrin cylinder things are ok but that is only one link to the rear end. the rear end forces transfer from the wheels to lateral links to lateral link bushings. Then to sub frame then to sub frame bushings then to frame, In short, call the guys at www.turninconcepts.com and they them your story. They will most probably recommend the "unabomber's sexy rear end" and your group n mounts. And if you really want a refresh get the rest of the rear suspension bushings. Pure awesome and easiest to install compared to all other brands.

food for thought. http://forums.nasioc.com/forums/show....php?t=1990539
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Old 08-06-2011, 03:13 PM   #4
Scooby Newbie
Member#: 263771
Join Date: Nov 2010

You'll love the Group-N mounts if you do engine, tranny, and tranny crossmember all at once. NVH is a total non-issue.

Leave your pitch stock though if NVH will bug you. Any aftermarket one will be a notable increase in NVH. (The Group N one probably won't be and it's cheap, but you probably won't notice a difference with it either.)
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Old 08-08-2011, 01:50 PM   #5
Scooby Specialist
Member#: 237145
Join Date: Feb 2010
Chapter/Region: SCIC
Location: 562
02 WRX
12 FXT


If you are really concerned about the pitch stop, do the DIY mod. 80% of performance with 80% less NVH than the aftermarket ones. The DIY is just to epoxy in the holes in the stock pitch stop. Thats what I did and it is awesome. Even painted it pink!
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