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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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Old 06-27-2020, 09:10 AM   #15
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How did locking up the rear brakes help you regain control? You entered a corner at 90+ and then made yourself lift causing oversteer.... where was the "curse" in all this!!?? Can you post some pics of your car and setup?
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Old 06-27-2020, 09:43 AM   #16
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90mph turn on public roads and any car take this turn? I might be wrong, but aren't speed limits in US lower then that?
Traction Control off - better don't do that on public roads. During daily driving/cruising attention level is way way lower then concentration on track, and there can be many uncontrollable & unpredictable variables. Suggest to keep at least vsc sport as minimum.
If you change car rake, it will change also grip balance more to oversteer
If you needed to change tire size to reduce rubbing, imho that sounds like your car has many handling issues from chosen tire/wheel sizing and overlowering. Some unwise mods in that area need extra mods to fix introduced issues, or reduce extent of mods/changes that made car worse.
If you select tire sizing way off from stock, then it's always worth to do in more educated fashion to know what one is doing, then going by hunch of what "subjectively seemingly looks cooler" and possibly introduce handling issues.
How high you may value mentioned alignment shop says nothing to us. Post actual alignment values to see for abnormalities in those. The reason why it's always worth to ask for alignment printout - to ensure QA of their work and for others to enable to give actual useful advises instead of playing spanish inquisition and guesswork games.
If car is oversteering, driving inputs that add even more transfer mass & grip to front, reducting those from rear, will make it even worse, so one shouldn't brake or lift-off mid turn, just judge reasonable entry speed and balance neutral grip with partial throttle mid turn. Or rely on nannies, that you have turned off due overconfidence.

In my eyes result was caused by several factors, them all enhancing each other issues/impact to handling. As to which ones are better to fix .. not enough info in OP.
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Old 06-27-2020, 11:14 AM   #17
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90mph turn on public roads and any car take this turn? I might be wrong, but aren't speed limits in US lower then that?
legal speed limits are much lower in most areas, set to 55 or 65mph.

however many roadways have a sort of unspoken 70-90mph running speed that moving at a slower pace actually creates more of a rolling roadway hazard.
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Old 07-14-2020, 03:50 PM   #18
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7. Do some research on suspension geometry. It sounds like you may have some seriously compromised aftermarket suspension setup if you are rubbing the sidewalls of tires.
not sure how you came to this theory when its most likely wheels that were not thought out if they would fit or not
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Old 07-14-2020, 07:45 PM   #19
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I think there is a sticky by Racecomp on this subject already!

https://www.ft86club.com/forums/showthread.php?t=67345
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Old 07-17-2020, 05:32 PM   #20
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not sure how you came to this theory when its most likely wheels that were not thought out if they would fit or not
You know, that's a good question... I don't really remember, but it made sense at the time. . Maybe I meant to include "suspension/wheel" in there or something.
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Old 07-17-2020, 06:39 PM   #21
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Your back tires are too tall. It will make it so they read slower than the fronts. Therefore the car wonít know theyíre losing traction until itís too late. Fix the tire setup first, then get the alignment checked again and post the printout. We canít really help more without more info.
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Old 07-17-2020, 08:13 PM   #22
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90mph turn on public roads and any car take this turn? I might be wrong, but aren't speed limits in US lower then that?
Traction Control off - better don't do that on public roads. During daily driving/cruising attention level is way way lower then concentration on track, and there can be many uncontrollable & unpredictable variables. Suggest to keep at least vsc sport as minimum.
If you change car rake, it will change also grip balance more to oversteer
If you needed to change tire size to reduce rubbing, imho that sounds like your car has many handling issues from chosen tire/wheel sizing and overlowering. Some unwise mods in that area need extra mods to fix introduced issues, or reduce extent of mods/changes that made car worse.
If you select tire sizing way off from stock, then it's always worth to do in more educated fashion to know what one is doing, then going by hunch of what "subjectively seemingly looks cooler" and possibly introduce handling issues.
How high you may value mentioned alignment shop says nothing to us. Post actual alignment values to see for abnormalities in those. The reason why it's always worth to ask for alignment printout - to ensure QA of their work and for others to enable to give actual useful advises instead of playing spanish inquisition and guesswork games.
If car is oversteering, driving inputs that add even more transfer mass & grip to front, reducting those from rear, will make it even worse, so one shouldn't brake or lift-off mid turn, just judge reasonable entry speed and balance neutral grip with partial throttle mid turn. Or rely on nannies, that you have turned off due overconfidence.

In my eyes result was caused by several factors, them all enhancing each other issues/impact to handling. As to which ones are better to fix .. not enough info in OP.

Itís not a turn. Excuse me not knowing the exact term. But it wasnít a straight away on the freeway. More like a curve that requires you turning the wheel slightly to the right.
Before I ran the 245 40 18 I could hit these roads at 90 with 100% confidence. But while on the new tire setup in the back the car felt like a boat rocking left to right. As if it wasnít responding to me trying to keep it centered while in my lane.


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Old 07-17-2020, 08:15 PM   #23
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not sure how you came to this theory when its most likely wheels that were not thought out if they would fit or not

Yeah it totally was the tire setup. I went back to 245 35 18 and I passed this same spot on the freeway with no issues.
I didnít realize the two tires in the back would change the dynamics of the car.


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Old 07-17-2020, 08:18 PM   #24
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Originally Posted by Yoshoobaroo View Post
Your back tires are too tall. It will make it so they read slower than the fronts. Therefore the car wonít know theyíre losing traction until itís too late. Fix the tire setup first, then get the alignment checked again and post the printout. We canít really help more without more info.

This was exactly the issue ! Again excuse my ignorance. I didnít know the height would effect the steering so much. Went back to the 245 35 18 all around and it feels how it should! I started this thread right after the incident so I failed to explain clearly. Especially the section of the freeway That the accident occurred


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Old 07-17-2020, 09:25 PM   #25
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Quote:
Originally Posted by pher.da.rico View Post
This was exactly the issue ! Again excuse my ignorance. I didnít know the height would effect the steering so much. Went back to the 245 35 18 all around and it feels how it should! I started this thread right after the incident so I failed to explain clearly. Especially the section of the freeway That the accident occurred


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Glad you figured it out!
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Old 07-18-2020, 06:30 AM   #26
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How did locking up the rear brakes help you regain control? You entered a corner at 90+ and then made yourself lift causing oversteer.... where was the "curse" in all this!!?? Can you post some pics of your car and setup?

I failed to explain the scenario
It wasnít a corner ! Mannn itís one of the sections on the freeway itís not a turn but a sliiiiight curve youíd see on a freeway


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Old 07-18-2020, 07:08 PM   #27
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Tire compound difference + larger rake angle from larger diameter rear tires (further reducing traction at rear)... keep same exact tire and size on all four corners from now on.

I experimented with track performance tires front and stock tires rear and it was hilarious fun in slow speed corners/in town traffic...not so much fun at highway speeds or high speed turns.
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