GT350R Springs for GT (high rate, minimum lowering)

Discussion in 'Suspension, Brakes & Chassis' started by valentinoamoro, Oct 12, 2016.

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  1. strengthrehab

    strengthrehab Well-Known Member

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    #646 strengthrehab, May 18, 2020
    Last edited: May 18, 2020
    Brian has set up countless cars. You wont go wrong by listening to him.

    Believe me.

    Edited to sound less like an a-hole.
     
  2. Norm Peterson

    Norm Peterson corner barstool sitter

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    Then maybe forget all about changing the springs and start out with just the shocks/struts and a stiffer front sta-bar (ideally adjustable). Consider an adjustable rear bar later if you still can't get the feel/handling balance that you're looking for.


    Norm
     
  3. givemeadollar

    givemeadollar Well-Known Member

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    I listened to the advice given around here and Just installed the FRPP track shocks and struts with BMR SP083 springs and GT350R front/rear sway bars. It is night and day difference between the base GT suspension and whats currently on it. Not too stiff but very planted and flat, I would definitely recommend this to anyone looking for a great suspension setup that won't break the bank.
     
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  4. NightmareMoon

    NightmareMoon Well-Known Member

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    if your roads are bad then You should be a little reluctant about stiff springs. Softer higher springs (you need travel for the suspension to work on bad roads) and use good shocks to control the ride, thing is the base springs are really too soft if you drive very hard. ~PP1 spring rates are ok for handling when paired with good shocks and mildly stiffer swaybars. Lighter wheels also help on poor quality roads.
     
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  5. Brian@BMVK

    [email protected] Well-Known Member

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    Not sure people realize just how soft the base springs are for a car this size/weight. PP1 rates are marginal but decent. Just a bit more (200/800) is really good for a street car that's enthusiastically driven.
     
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  6. NightmareMoon

    NightmareMoon Well-Known Member

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    Yeah I know a really good local autocrosser who's very very fast in these heavy high horsepower cars. Its been interesting to watch him try to get his base car to handle in FS. Definitely has struggled more than I did starting with a PP1 car (although he's an alien, and thus still beats me most of the time). His trouble is keeping the soft base springs off the bump stops, he has to run higher adjustable shock settings than I needed to get similar results.

    Thing is, GT350R spring rates will be a bit much of a lot of people/roads. PP1 was a good spring rate IMHO from Ford, they just let us down with the cheap shocks and the car really needed a bit more swaybar (although yeah, bumpy roads and stiffer swaybards aren't a good match either).
     
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  7. shogun32

    shogun32 Well-Known Member

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    higher rate springs don't make a car ride stiff as such - unless the spring rates are totally whacked. What makes the ride 'stiff' is the inability of the damper piston to move fast enough thru the fluid. If the car rides poorly it's almost always the damper that is at fault.
     
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  8. Brian@BMVK

    [email protected] Well-Known Member

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    The clutch pack diff he's got isn't helping either. Kinda crazy that they're classed the same, IMO. I hated my base suspension.
     
  9. Brian@BMVK

    [email protected] Well-Known Member

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    Only big exception to this is low speed (<10 mph), where you're not going to have high damper speeds no matter what. That is when you feel the stiffness.
     
  10. Roadway 5.0

    Roadway 5.0 Strassejager

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    100% agreed. 200/800 is a sweet spot for the street. Match this with good dampers, a roll center correction/bump-steer kit if the springs lower the car, get a good alignment, and add sway bars.

    These things alone will dramatically change the dynamic of the car for the better.

    200/800 Options (that I know of):

    Steeda Minimum Drop Fronts / BMR SP088 Rears
    Eibach ProKit
    Steeda Linear Sport Springs
     
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  11. Brian@BMVK

    [email protected] Well-Known Member

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    Sport linear springs no longer available. With those or the Pro Kit I'd go with a 1/8" spring spacer to get the rear drop to 3/4".
     
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  12. Jonyxz

    Jonyxz Well-Known Member

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    gt350 base fronts (0.38 drop) 194 lbs / sp088 rear with 1/8 spacer (0.25 drop) 800 lbs

    This is the most atractive 200/800 combo for me as it keeps the drop at a minimum.

    The pp1 rear idea was to keep stock height in the back and have oem springs in all 4 corners. But consensus seems to be that 728 lbs is apparently too low in the rear
     
  13. Jonyxz

    Jonyxz Well-Known Member

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    What I dont understand is: I see people praising and recommending gt350r/sp088 combo (240/800) and even sp084/sp088 combo (300/800).
    If these combos are balanced then logic tells me that a gt350 base/pp1 combo (194/728) should also work. Which is also a very similar rate to Steeda's minimum (200/750).
    Are all these combos I mentioned somehow unbalanced?
     
  14. shogun32

    shogun32 Well-Known Member

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    you do? Citation? Then best to ignore said recommendations.

    that combo does indeed work (ignoring drop) as far as chassis frequency is concerned.
     
  15. Brian@BMVK

    [email protected] Well-Known Member

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    Barely. It's on the cusp of soft enough to not matter too much whether it's barely there or not.
     
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