Suspension and Handling Technical Reference
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This is a discussion on Suspension and Handling Technical Reference within the Suspension & Wheels forums, part of the Tech & Modifying & General Repairs category; This is the Suspension and Handling Technical Reference Thread. A Technical Reference is a document, link or thread containing factual ...

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    Moderator GV27's Avatar
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    Introduction

    This is the Suspension and Handling Technical Reference Thread.

    A Technical Reference is a document, link or thread containing factual information such as diagrams, specifications, procedures, etc.

    This thread contains technical reference documents, links to threads useful as technical reference, as well as links to outside reference sources.

    Please do not post comments here. Instead PM the author or post a new thread commenting on a particular post in this thread.

    Please do feel free to post your own technical references, but please insure that they are authoritative - I want to try to avoid mis-information in this thread!

    Thanks,

    Chris
    Last edited by GV27; 01-10-2005 at 03:35 PM. Reason: Change now that I'm not moderator of this forum
    "Inasmuch as ye have done it to one of the least of these my brethren, ye have done it to me." -Jesus

    1990 Alfa Romeo Spider Veloce
    1992 Toyota 4Runner SR5 3.Slow
    1993 Honda CBR600F2
    2002 WRX SportWagon *sold*

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    Moderator GV27's Avatar
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    Front Suspension Diagram

    Service Manual Excerpt
    Attached Thumbnails Attached Thumbnails front suspension.gif  
    Last edited by GV27; 09-27-2002 at 09:37 AM.
    "Inasmuch as ye have done it to one of the least of these my brethren, ye have done it to me." -Jesus

    1990 Alfa Romeo Spider Veloce
    1992 Toyota 4Runner SR5 3.Slow
    1993 Honda CBR600F2
    2002 WRX SportWagon *sold*

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    Moderator GV27's Avatar
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    Rear Suspension Diagram

    Service Manual Excerpt
    Attached Thumbnails Attached Thumbnails rear suspension.gif  
    "Inasmuch as ye have done it to one of the least of these my brethren, ye have done it to me." -Jesus

    1990 Alfa Romeo Spider Veloce
    1992 Toyota 4Runner SR5 3.Slow
    1993 Honda CBR600F2
    2002 WRX SportWagon *sold*

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    Moderator GV27's Avatar
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    Brake Fluid Specifications Chart

    Shamelessly stolen from:

    http://www.swedishbricks.net/700900F...Comparison.htm

    BP = Boiling Point. Wet is the important number - unless you change your fluid every day.

    Temps are in deg. F.

    When selecting a brake fluid, do some research on how long it lasts and how long YOU want it to last. For example, Motul 600 requires a 6 month or less change interval because it readily absorbs water. It'll give you WORSE performance when old than standard DOT 4 fluid. On the other hand ATE has a change interval of 2 YEARS because it does not absorb water as easily - this is what I use so I don't have to worry about it. AP Racing is not even listed because it has a change interval of "before every race". Probably a month or two on the street. A longer lasting fluid will give you better performance in the long run unless you follow these service intervals.
    Attached Thumbnails Attached Thumbnails fluidchart.gif  
    Last edited by GV27; 11-18-2002 at 01:16 PM.

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    Moderating on the run! Big Sky WRX's Avatar
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    STi Group N bushing schematic

    Last edited by Big Sky WRX; 02-08-2005 at 08:14 PM.

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    Moderating on the run! Big Sky WRX's Avatar
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    OE suspension components

    Stabilizer bar diameter (mm): front - 20, rear - 20(sedan)/17(wagon)
    Jounce (mm): front - 80, rear - 110
    Rebound (mm): front - 110, rear - 95
    Spring rates (N/mm): front - 28.5, rear - 20.9/23.1 (Manual/automatic)

    N/mm -> ft lbs/inch N X .2248/.03937 thus- front 162.7, rear 119.3

    From SOA

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    Moderating on the run! Big Sky WRX's Avatar
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    STi/SPT suspension FAQs

    This is the same setup as the STi v7 RA uses. Here are some frequently asked questions:

    2002 SUBARU IMPREZA WRX PERFORMANCE STRUT & SPRING FAQ


    2002 Impreza WRX Struts
    (These struts are sold separately, and are only available in the WRX STi Performance Suspension Kit)
    What is the compression Rate? Front 2396 / 791 N, Rear 1668 / 690 N
    What is the Rebound Rate? 0.3m/sec
    What characteristics in under and over steering are affected by them? The vehicle characteristics remain neutral when the suspension kit is
    What color are they? Red.
    Are they rebuildable? No, they are not rebuildable.
    Are they adjustable? No, they are not adjustable.
    Who is the manufacture? The manufacturer is Kayaba (KYB).
    What are the component sizes compared to stock?
    Strut piston diameter 39.92mm (Sti version) vs. 22.00mm (Stock)

    What process is done on them that make them better than the others? The specifications for performance were derived from WRC Subaru Rally Car experience
    Will they work on other models? No, they are designed specifically for the WRX and must be used with the complete WRX performance suspension kit.
    ------------------------------------------------------------------------
    2002 Impreza WRX Suspension Spring
    (This part is not sold separately, it is only available in the Performance Suspension Kit)
    What is the "Progressive Rate"? Front 38.0 N/m, Rear 33.4 N/m
    What is the "Roll"? It will be less than the stock suspension system.
    What are the I/D's and O/D's Inner diameter = 5.625", Outer diameter = 6.875"
    What is the "Free-Length"? Rear (300mm), Front (270mm)
    Will there be a height difference? Height remains the same.
    Will the be a stiffening difference? Yes, there is a difference
    If so, what % will the stiffness be? The system is stiffer than stock
    Who manufactures them for Subaru? The front springs are manufactured by Mitsubishi-Seiko and the rear springs are manufactured by Nippon-Hatsujo.
    What material are they made of? Steel.
    What process is done on them that make them better than the others? The specifications for performance were derived from WRC Subaru Rally Car experience.
    Will they work on other models? No, they are designed specifically for the WRX and must be used with the WRX performance suspension kit.

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    Moderator GV27's Avatar
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    Aftermarket Suspension Parts listing

    Trying to clean up the forum. This thread was sticky, but I thought a link to it here would be more appropriate.

    This thread lists several aftermarket suspension options.

    Suspension Part Listings
    "Inasmuch as ye have done it to one of the least of these my brethren, ye have done it to me." -Jesus

    1990 Alfa Romeo Spider Veloce
    1992 Toyota 4Runner SR5 3.Slow
    1993 Honda CBR600F2
    2002 WRX SportWagon *sold*

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    List of Aftermarket Spring Rates

    Shamelessly stolen from:

    http://www.ravensblade-impreza.com/t...ng/spring.html

    Units are lbs/in.



    Range of rates indicates a progressive spring.
    Last edited by GV27; 07-23-2003 at 12:04 PM.
    "Inasmuch as ye have done it to one of the least of these my brethren, ye have done it to me." -Jesus

    1990 Alfa Romeo Spider Veloce
    1992 Toyota 4Runner SR5 3.Slow
    1993 Honda CBR600F2
    2002 WRX SportWagon *sold*

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    Moderator GV27's Avatar
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    Suspension Setup Table

    The table at the following link talks about various suspension adjustments that can be made that effect the balance, feel, and/or total cornering traction of the vehicle.

    Thanks bdoug for the reference.

    http://www.clubsi.com/suspension_tweak_table.shtml
    Last edited by GV27; 12-05-2003 at 01:48 PM.
    "Inasmuch as ye have done it to one of the least of these my brethren, ye have done it to me." -Jesus

    1990 Alfa Romeo Spider Veloce
    1992 Toyota 4Runner SR5 3.Slow
    1993 Honda CBR600F2
    2002 WRX SportWagon *sold*

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    How To: STi Lateral Link Bushings

    How to press in the SPT/STi Lateral Link Bushings. Special thanks to **** Nogs for this one!

    pressing in the STI bushings - howto
    Last edited by GV27; 03-26-2003 at 03:39 PM.
    "Inasmuch as ye have done it to one of the least of these my brethren, ye have done it to me." -Jesus

    1990 Alfa Romeo Spider Veloce
    1992 Toyota 4Runner SR5 3.Slow
    1993 Honda CBR600F2
    2002 WRX SportWagon *sold*

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    Moderating on the run! Big Sky WRX's Avatar
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    STi Group N suspension bushing part #s

    FWIW I thought I'd list part #s for the Group N suspension bushings. First, the bushings are the same whether for GC, GD, GG.

    front lateral link outer ST2022044020 also 20251AA040 (SOA part #-came from STi/SPT front sway kit-sedan)

    front lateral link inner 20251AA050 (SOA part #-came from STi/SPT front sway kit-sedan)- don't have STi part # as I already had these

    rear lateral link outer same as front outer

    rear lateral link inner ST2022044040

    trailing link front ST2022044000

    trailing link rear ST2022044010

    transverse link (front control arm) rear (left side) ST2020055010

    transverse link (front control arm) rear (right side) ST2020055000


    Big Sky

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    Street Racer Emeritus
    '02 2.5L WRX - Retired

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    Tire weight chart

    My Subaru tire weight chart is located at

    http://www.family-news.net/tires

    Please let me know if you have any relevant information.

    Rob

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    Moderator GV27's Avatar
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    Big Wheel Spec Thread (was sticky)

    Large thread, not necessarily large wheels!

    Wheel Database with PICS
    "Inasmuch as ye have done it to one of the least of these my brethren, ye have done it to me." -Jesus

    1990 Alfa Romeo Spider Veloce
    1992 Toyota 4Runner SR5 3.Slow
    1993 Honda CBR600F2
    2002 WRX SportWagon *sold*

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