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Suspension | Chassis | Brakes -- Sponsored by 949 Racing Relating to suspension, chassis, and brakes. Sponsored by 949 Racing. |
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02-23-2022, 07:37 PM | #1 |
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Suspension overhaul: what "needs" doing?
Hello all, quick background on all potentially relevant details:
I'm looking for some advice on a few suspension topics to back up the research I've done so far.:
Thanks for any help!
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2015 FR-S - Jackson Racing C30 Supercharger - 17x8 White Vors TR4 5x100 35 - Firestone Firehawk Indy 500 (17x7.5) - Remark Axleback Muffler Delete
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02-24-2022, 10:13 AM | #2 |
I do my best to avoid poly in locations that move/pivot, only real exception being swaybar bushings. I prefer OEM, hardened rubber, and spherical bearings.
So, dedicated track build. What kind of tires and what size are you running? Are you planning on competing anywhere and do you need to worry about classing? - Andrew |
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02-24-2022, 09:02 PM | #3 | |
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Quote:
Currently running stock-sized Firestone Firehawk Indy 500s (17x7.5) mounted on 5x100 35s. They're on their last year of use likely, and I'm open to suggestions on best choices for track uses. I'm most interested in competing in the power:weight class after probably a solid 6 months of self-pacing to get comfortable with the ultimate setup. Planning on doing a full non-essential strip and roll-cage install; everything from AC delete to full interior trim removal and glass-->polycarbonate (Lexan). Very, very up in the air at this point on deciding between an LS swap (yes, very original), or gong full send on the FA20 and going forged short block + internals running E85. Could consider upgrading from the super to a turbo, however I settled on the super route originally because I wanted to preserve the fundamental FA20 characteristic. If I'm sticking w/ an FA20 build, I'm staying committed to that intent.
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2015 FR-S - Jackson Racing C30 Supercharger - 17x8 White Vors TR4 5x100 35 - Firestone Firehawk Indy 500 (17x7.5) - Remark Axleback Muffler Delete
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02-24-2022, 10:48 PM | #4 |
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Your in Vegas right? Would you car to see how my car drives with spherical bushings?
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02-24-2022, 10:50 PM | #5 |
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I would be interested! Have you ran poly vs. spherical in your build? Or only spherical?
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2015 FR-S - Jackson Racing C30 Supercharger - 17x8 White Vors TR4 5x100 35 - Firestone Firehawk Indy 500 (17x7.5) - Remark Axleback Muffler Delete
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02-24-2022, 10:57 PM | #6 |
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I have the whole SPL Parts catalog on the car. I have SuperPro steering rack and diff outrigger bushes. I am waiting to install the diff mounts and subframe bushes.
I have not experienced poly bushes in the suspension arms. |
02-24-2022, 11:37 PM | #7 |
If this is your first year extensively tracking your car, I would focus on the basics: reliability and safety.
So, it's unlikely that you'll be able to do a complete motor revamp and/or swap and still get decent and consistent track time in (and then troubleshoot motor issues at the track when you should be focusing on driving). Make sure what you have now is working well and stick with that while you get comfortable. Just my opinion. For suspension, yes going through your bushings on your 85k mile car is a great thing to do. If you want to maximize on track time and driver improvement, the easy solution is replace everything with fresh OEM. If you want an improvement over OEM, I'd replace most with OEM and strategically replace a few key bushings by replacing the full suspension arm. Rear toe arm, rear trailing arm, rear LCA. You can go farther after that...but that's a big chunk of the potential improvement in bushing replacement and adjustability. Worry about the rest later. Get a good performance alignment from a good shop. Good track brake pads and track fluid. Probably worth getting some fresh OEM brake lines or stainless if you really want to. Lots of options for tires. If you're sticking with 17x8 wheels then 225/45/17 Falken RT660s are one good way to go. Remember...more complexity, more parts, more things to worry about, potentially less time on track driving. - Andrew |
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The Following 5 Users Say Thank You to Racecomp Engineering For This Useful Post: | Capt Spaulding (03-01-2022), Escher (02-25-2022), kevaughan (03-06-2022), new2subaru (02-25-2022), Thefalls (02-25-2022) |
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