gcmak
Well-Known Member
- Joined
- Mar 6, 2021
- Threads
- 13
- Messages
- 238
- Reaction score
- 259
- Location
- San Francisco
- Car(s)
- 2021 Supra
- Thread starter
- #1
**Update**
Thanks to forum member @Msoupe - the shop fixed the mistake and I'm back in business.
The 6 spacers included with the FLCAs (3 for each side), are only to be used as needed, if the car is lowered. Since my car was is not lowered, no spacers should be used. SPL designed the part to work perfectly with the stock height so the roll center would not be messed up.
Simply removing the few spacers, the car has an on-center steering feel again, and remains planted on corners - only triggering VSC when I am actually overcoming tire grip.
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About a week and 130 miles ago I had a shop install the SPLC FCLA and adjustable caster bearings, mount and balance Advan Apex V601 tires (stock sizes on my original rims), and align the car. Install looks clean, they've worked on quite a few Supras, and have been helpful and responsive throughout.
Initial impressions with the changes are the car's turn-in is quicker/sharper. No issues with low/high speed straight line acceleration or braking, and no appreciable changes in NVH (everything else suspension-wise is original).
I did almost immediately start to notice stability control (VSC) was activating for highway on/off ramps; coasting on a curve. Then I had to do a U turn and noticed VSC was also kicking in. Drove more miles but kept noticing VSC would kick in before I could sense that I was losing mechanical grip. Asking the shop, they stated they aligned the car similarly to most other Supras they've had and no owners have reported issues. They hypothesize the caster settings could be causing the wheels to skip but are pretty doubtful. Cross checking alignment sheets posted by other Supra owners, I would say the alignment is within factory recommended spec and shouldn't cause sensor or other issues (and I have no errors/warnings).
In an empty lot I drove in circles with VSC and VSC Sport. While in VSC Sport, I felt like I wasn't losing mechanical grip at the speeds of ~8-10mph, when VSC would aggressively intervene. At ~15mph I could sense push and even faster led to pure understeer and that's when VSC Sport would kick in. The threshold for when VSC would previously intervene (in bone stock setup) prior to these changes, was a higher speed in all situations.
Video of circles with VSC ON:
I checked for sway bar interference - there's none - no witness marks on any parts.
Has anyone's experienced this in their Supra. I'm leaning towards this being a tire issue, because it could definitely be the case I need to put more miles on the tires for them to break-in, and unfortunately I don't have a second set of wheels (or the OEM tires) to test.
Thanks to forum member @Msoupe - the shop fixed the mistake and I'm back in business.
The 6 spacers included with the FLCAs (3 for each side), are only to be used as needed, if the car is lowered. Since my car was is not lowered, no spacers should be used. SPL designed the part to work perfectly with the stock height so the roll center would not be messed up.
Simply removing the few spacers, the car has an on-center steering feel again, and remains planted on corners - only triggering VSC when I am actually overcoming tire grip.
----------
About a week and 130 miles ago I had a shop install the SPLC FCLA and adjustable caster bearings, mount and balance Advan Apex V601 tires (stock sizes on my original rims), and align the car. Install looks clean, they've worked on quite a few Supras, and have been helpful and responsive throughout.
Initial impressions with the changes are the car's turn-in is quicker/sharper. No issues with low/high speed straight line acceleration or braking, and no appreciable changes in NVH (everything else suspension-wise is original).
I did almost immediately start to notice stability control (VSC) was activating for highway on/off ramps; coasting on a curve. Then I had to do a U turn and noticed VSC was also kicking in. Drove more miles but kept noticing VSC would kick in before I could sense that I was losing mechanical grip. Asking the shop, they stated they aligned the car similarly to most other Supras they've had and no owners have reported issues. They hypothesize the caster settings could be causing the wheels to skip but are pretty doubtful. Cross checking alignment sheets posted by other Supra owners, I would say the alignment is within factory recommended spec and shouldn't cause sensor or other issues (and I have no errors/warnings).
In an empty lot I drove in circles with VSC and VSC Sport. While in VSC Sport, I felt like I wasn't losing mechanical grip at the speeds of ~8-10mph, when VSC would aggressively intervene. At ~15mph I could sense push and even faster led to pure understeer and that's when VSC Sport would kick in. The threshold for when VSC would previously intervene (in bone stock setup) prior to these changes, was a higher speed in all situations.
Video of circles with VSC ON:
I checked for sway bar interference - there's none - no witness marks on any parts.
Has anyone's experienced this in their Supra. I'm leaning towards this being a tire issue, because it could definitely be the case I need to put more miles on the tires for them to break-in, and unfortunately I don't have a second set of wheels (or the OEM tires) to test.
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