Featured H&R Lowering Spring Review at Streets of Willow Springs Track Event

Discussion in 'Suspension | Chassis | Brakes' started by MMR, Sep 24, 2019.

  1. MMR

    MMR Active Member

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    #1 Sep 24, 2019
    Last edited: Sep 25, 2019
    2020 Toyota Supra Track Day 2

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    Streets of Willow Springs - Fastest lap time: 1:25.36
    (Reference time: 1:22.43 in my S2K naturally aspirated with aero)

    Modifications:
    H&R Lowering Springs
    Toyo Proxes R888R 265/35R19 & 295/30R19
    (Stock engine and brakes)

    Streets of Willow is a fairly tight and technical track requiring finesse and smooth applications all around (steering, throttle, brake) to tie together a decently fast lap time. There are a few high speed sections and transitions that will definitely test your courage. The Supra seemed to be a perfect fit for the track as it shares the sharp steering qualities similar to a S2000 (well not quite, keyword similar) and a healthy amount of power even in stock form. We didn't have time to upgrade the pads from stock, but we did install a set of H&R lowering springs as I was general curious as to whether or not lowering springs would actually provide a noticeable improvement in roll, especially in mid to high speed sweeping corners. To my surprise, the H&Rs did a fantastic job both on track and on the public streets/highways.

    On Track Performance:

    A few noticeable improvements the springs gave us were:
    1. Lower ride height (very important)
    2. More camber. Fronts were able to achieve -2.2 to -2.3 deg camber (matched rears), which translated in improved turn in/mid corner grip, as well as better tire wear (as the tire was not rolling over the sidewall nearly as much as it did with -1.8 deg camber).
    3. A notable decrease in body roll. The stock suspension caused the Supra to roll more than ideally, giving a slight "floaty" feeling in high speed sweepers and transitions. While the overall car was still planted thanks to its' great chassis, the softness was definitely not what you'd call confidence inspiring in certain sectors of the track.

    Streetability/Comfort

    I drove the car to and from the track approximately 120 miles each way and can honestly say that the springs did not add much, if any, harshness or discomfort on the road. In comfort mode, both the H&R and factory springs felt nearly identical in my opinion, whereas. Lowering springs are definitely not the end all solution if you are looking to maximize lap times. However for the daily driver or average weekend track day goer who still uses their Supra as a daily driver and wants to maintain the electronic suspension options, the H&R's won't disappoint. The next step for our Supra will be KW V3 (or Clubsport) coilovers with the Electronic Suspension Cancellation kit in a few weeks to come.

    Before leaving this on a note of spring "praise" lol, it is very fair to mention that upgrading the stock brake pads should be at the top of the list when going about track preparation. Brake fade is apparent after a few laps, and progressively worsens as it gets hotter (Especially on the second track day, even with Motul RBF600 fluid). The next pad upgrade will likely be the CSG C2 (Race) pads.



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    Post installation Photos:

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    Parked and Action Side by Side Comparison photos:


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  2. MA617M

    MA617M Well-Known Member

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    Awesome thank you. I assume no rubbing either?
     
  3. OP
    OP
    MMR

    MMR Active Member

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    No rubbing whatsoever.
     
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  4. ayau

    ayau Member

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    Any thoughts on why Toyota included such soft springs consider the car’s cornering abilities?
     
  5. Dannyvandelft

    Dannyvandelft Well-Known Member

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    It's supposed to be a car you can daily. If it was super stiff and jarring you would hate to drive it every day. It's a compromise.
     
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  6. Dannyvandelft

    Dannyvandelft Well-Known Member

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    Sits perfect. Love it. How was the install? Pretty straightforward?
     
  7. PerformanceSound

    PerformanceSound Well-Known Member

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    Awesome shot!!! :cool::thumbsup:
     
  8. OP
    OP
    MMR

    MMR Active Member

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    Street comfort is my best guess. Although Jackie Ding posted a video when he removed his factory suspension and tested the spring rate and damper on a shock dyno. Some pretty interesting insight with the shock valving and how the rear suspension was engineered with the struts placed further inboard in comparison with the fronts giving requiring a higher spring rate in the rear (3k/9k iirc). I'll post the link so you can check it out, definitely some cool info.



    Install was super straight forward for the most part. If you've installed springs or coilovers before you can install these.

    Thank you, more to come!
     
  9. OP
    OP
    MMR

    MMR Active Member

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    #9 Sep 25, 2019
    Last edited: Sep 25, 2019
    *Updating original post with new photos and info*

    The springs should now be fully "settled in" after 300 miles of street driving and 3 sessions at the track. It may also be helpful to note that there was zero rubbing with the springs installed, and Toyo R888R F: 265/35R19 R: 285/30R19 under the factory fenders.

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    It was also interesting to see a close comparison between one MKV on springs and one on stock suspension, both in the same corner. Ours (with springs installed) and Jerel's Supra (factory springs)!


     
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  10. Thatguyw_stat

    Thatguyw_stat Active Member

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    Planted, and gorgeous.. I’ve got a stock pile of parts waiting for my car to come back from final tuning...
     
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  11. Gearbangin

    Gearbangin Well-Known Member

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    How’d the lap times compare stock car vs springs and upgraded rubber?
     
  12. OP
    OP
    MMR

    MMR Active Member

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    Nice.. what do you have on the way?
     
  13. OP
    OP
    MMR

    MMR Active Member

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    That was my first visit to there in the Supra, but I've frequented that track about 30-40 times in my S2K. The prior week I drove it at a different track on stock suspension (same rubber), and I would estimate 1-1.5 seconds with both.
     
  14. Thatguyw_stat

    Thatguyw_stat Active Member

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    What is already here lol.
    R888R (rear only )
    H&R Springs
    Wheel Studs and lug nuts
    ECS Spacers

    waiting for LabWorx to finish tuning the car.. I went with the pure upgrade and some water meth. Debating front tires still since I won’t make any track days before it gets cold so I can wait for those. I might make a drag strip Visit and see what it can do
     
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  15. Powaup

    Powaup Well-Known Member

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    That fitment... perfection
     

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