09-17-2019, 12:55 PM | #3725 |
Senior Member
Join Date: Sep 2017
Drives: '15 STX
Location: San Jose, CA
Posts: 237
Thanks: 10
Thanked 157 Times in 103 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
Seems to me like you need to work with the rear end more and not the front. Try stiffening it and then changing the rake angle.
The car doesn't trail well, imo. Need to be soft with it and have a softer brake compound. |
The Following User Says Thank You to tony_r For This Useful Post: | strat61caster (09-17-2019) |
09-17-2019, 01:05 PM | #3726 | |
Senior Member
Join Date: Jul 2017
Drives: 2017 BRZ w/PP
Location: Pa
Posts: 1,027
Thanks: 51
Thanked 302 Times in 225 Posts
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
|
Quote:
well i was talking to some people last week and non of them run 255 but they dont have 17+. someone said that 255 contact but i dont seem to be having an issue but then again i dont have REs yet. im just trying to figure out what im going to get this winter |
|
09-17-2019, 01:10 PM | #3727 | |
Senior Member
Join Date: Jan 2018
Drives: 2013 FRS
Location: VA
Posts: 305
Thanks: 1
Thanked 87 Times in 55 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Tried the bar stiffer at a local even before nats and it was no good. Softened it some immediately. Ended up softening it much more at nats with some improvement. It is based mostly off of Lincoln. The long courses there really brought out the weaknesses I think. Generally at local events I was getting some push on certain turns but usually just one or two turns on a given course. At nats there were just a lot of those turns. Basically, the more I have to turn the wheel, the more it pushes, which is to be expected. |
|
09-17-2019, 09:11 PM | #3728 | |
Senior Member
Join Date: Feb 2015
Drives: 2014 FR-S MT
Location: metro-Atlanta area
Posts: 120
Thanks: 131
Thanked 77 Times in 47 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Quote:
This is another reason why I was not fond of 7+ degrees of caster when I had adjustable front LCAs. With 4 degrees of static camber and 7 degrees of caster, your front wheels will cut increasingly sharply diagonally into the pavement the more steering input you give. With that much camber and caster, the effect is akin to an alpine skiier digging their edges into the snow. Your contact patch becomes more compromised the more you have to turn the steering wheel. If you're not willing or able to experiment with something closer to OEM caster, I would try taking a wider arc through tighter corners to minimize steering input. |
|
The Following User Says Thank You to H1C For This Useful Post: | Racecomp Engineering (09-20-2019) |
09-17-2019, 09:34 PM | #3729 | |
Senior Member
Join Date: Jan 2018
Drives: 2013 FRS
Location: VA
Posts: 305
Thanks: 1
Thanked 87 Times in 55 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Quote:
|
|
09-17-2019, 09:40 PM | #3730 | |
Senior Member
Join Date: Feb 2015
Drives: 2014 FR-S MT
Location: metro-Atlanta area
Posts: 120
Thanks: 131
Thanked 77 Times in 47 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Quote:
I found the difference between 6 degrees and anything 7 or higher pretty noticeable, in terms of steering self-centering force and the jacking up of the inside rear in tighter corners due to the cutting effect if I turned the wheel too much. The difference between 6 and 6.5 degrees maybe not so much. For me, I'd prefer to keep the camber and dial back the caster, but I don't run as much camber as you (3.8), so I haven't found it to affect braking performance enough for me to want to dial it back. In any case, good luck man -- I hope you can sort out this understeer issue. |
|
09-17-2019, 10:02 PM | #3731 |
Senior Member
Join Date: Jan 2018
Drives: 2013 FRS
Location: VA
Posts: 305
Thanks: 1
Thanked 87 Times in 55 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Thanks for the input. I will try dialing back the caster.
|
09-19-2019, 09:49 PM | #3732 |
Senior Member
Join Date: Dec 2016
Drives: 2013 FRS
Location: Central PA
Posts: 303
Thanks: 146
Thanked 66 Times in 43 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
Does adding more negative camber on the front throw the toe off significantly? I thought it would but someone recently told me that it doesnt on these cars.
I have coilovers and camber plates. Thinking about trying a bit more to see if i like it.
__________________
WIFE: "How can there be anything left to buy?"
|
09-20-2019, 12:03 AM | #3733 |
-
Join Date: Nov 2012
Drives: '13 FRS - STX
Location: SF Bay Area
Posts: 10,376
Thanks: 13,769
Thanked 9,495 Times in 5,008 Posts
Mentioned: 94 Post(s)
Tagged: 3 Thread(s)
|
Yes it changes enough where I would adjust the toe back to zero, I've done it and not noticed the toe change as a driver but in hindsight, imho a set of $60 toe plates is worth the investment to periodically check your alignment anyway and adding a few ticks of camber and zeroing out the toe diy is a worthy experiment between spending the money to put it on a rack
|
The Following User Says Thank You to strat61caster For This Useful Post: | bmacfrs (09-20-2019) |
09-20-2019, 07:16 AM | #3734 |
Senior Member
Join Date: Apr 2016
Drives: 23 BRZ 15 Impreza
Location: NY
Posts: 163
Thanks: 61
Thanked 78 Times in 52 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Using toe plates I have a 6mm difference in toe from maximum negative camber to minimum negative camber when adjusted at the camber plate. YMMV.
|
The Following 2 Users Say Thank You to cueball89 For This Useful Post: | bmacfrs (09-20-2019), strat61caster (09-20-2019) |
09-20-2019, 09:41 AM | #3735 |
I like caster, but as mentioned 7* with -4.1* of camber is quite a bit.
"As much caster as possible" has been a popular way to go on the internets but a motorsports engineer would tell you that caster is course dependent. - Andrew |
|
The Following 2 Users Say Thank You to Racecomp Engineering For This Useful Post: | CoolHandMoss (09-20-2019), H1C (09-20-2019) |
09-20-2019, 09:33 PM | #3736 | |
Senior Member
Join Date: Feb 2015
Drives: 2014 FR-S MT
Location: metro-Atlanta area
Posts: 120
Thanks: 131
Thanked 77 Times in 47 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Quote:
I think the internets may also be overlooking the vehicle context for high caster settings: usually it's heavy German cars with 0 negative camber and little or no ability to add more from the factory that come with 7 or 8 degrees of caster. It's the only way those cars can get turned in to a corner. On a car as light and nimble as ours, and given the ability to add adequate negative camber via plates or slotted struts, I find the factory caster to be plenty. |
|
The Following 2 Users Say Thank You to H1C For This Useful Post: | DocWalt (09-21-2019), Racecomp Engineering (09-21-2019) |
09-21-2019, 02:36 PM | #3738 | |
Senior Member
Join Date: Jan 2018
Drives: 2013 FRS
Location: VA
Posts: 305
Thanks: 1
Thanked 87 Times in 55 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Quote:
I'm going to bring the caster back to OE before the next event and bring the rear toe to 0 also. |
|
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Thoughts on a "component" setup with a 3.5" dash and 6.5" door setup? | PatrickSAN | Electronics | Audio | NAV | Infotainment | 22 | 11-14-2012 02:12 PM |
SCCA sway bar rules | gmookher | Suspension | Chassis | Brakes -- Sponsored by 949 Racing | 0 | 09-01-2012 06:48 PM |
Suggestion for vendor rules... | Tainen | Site Announcements / Questions / Issues | 31 | 08-15-2012 01:53 PM |
Rules for posting in this section | Hachiroku | User/Vendor/Sponsor Reviews, Feedback, Comments | 0 | 06-25-2012 11:02 AM |