[Track Setup] Non-HP Dark Horse - 305 Square Apex on Stock Springs - Rear Bar Only vs Both? + 200TW Tire Q

[turbo707]

TL;DR: 2024 Non-HP Dark Horse MagneRide - factory sway bars, no braces yet, stock non-HP MagneRide springs - not wanting to lower because of driveway clearance. Planning Apex VS-4 Endurance 19x11 ET52 + 25mm front = rotatable 305/30R19 square as my summer/track set, OEM wheels for winter. Only ∼3500-4000 miles/year between track days, autocross, and weekend drives, not a daily. Considering Steeda IRS braces / G-Track + alignment dowels. Want HP-like rotation for Thunderhill East and Sonoma.


Hey everyone,


Looking for real-world results from Non-HP Dark Horse and S650 GT PP guys who have run 305 square on stock MagneRide springs.


My current car:


• 2024 Dark Horse Non-HP MagneRide - Windsor, CA - I drive to/from the track


• 100% factory sway bars, no Steeda IRS braces, no G-Track brace - have not bought anything yet


• Stock non-HP MagneRide springs - not wanting to lower car because of driveway clearance / steep driveway


• I have OEM wheels for winter, so the Apex 305 setup will be summer/track only


• Only ∼3500-4000 miles per year - track, autocross, weekend drives - not a daily driver


What I'm planning:


• Apex VS-4 Endurance 19x11 ET52 square, 25mm front spacers for rotatable setup


• 305/30R19 square


• Camber plates - target -3.0F / -1.8R, zero front toe


• Considering Steeda Rear IRS Subframe Support Braces + Front G-Track Brace + IRS subframe alignment dowels


Questions:


1. Did the extra grip from 305s overwhelm the stock non-Handling Pack MagneRide springs or was it still predictable?


2. Did 305 square alone fix the factory push, or did adding a rear bar help, or did you need both front and rear?


3. Are the IRS braces, G-Track, and alignment dowels worth it on stock non-HP springs to stiffen up the frame along with sway bars?


4. For Thunderhill East through Cyclone and Sonoma - what bar setting gave you high-speed stability? Soft front / Medium rear vs Middle / Middle?


5. At -3.0F front, did the outer shoulder finally even out, or did -3.0 even it out more than -2.75F on stock springs?


Tire Q - 200TW since I have winter wheels:


Since this is a summer/track set only and I only drive 3500-4000 miles a year to/from the track:


• Goodyear Eagle F1 Supercar 3


• Nankang CR-S V2


• Continental ExtremeContact Force 295/30R19 on 11" wheel


How did they compare for wear and heat? Can I get 4-5 track days plus the drive to/from the track out of them at this low mileage?


Goal is close to that Handling Pack feel from Charlotte Roval - car goes where you point it, scrubs a little if you enter too hot, then tucks with a quick lift - without going full coilover and while staying drivable to the track.


Thanks,

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