follow ft86club on our blog, twitter or facebook.
FT86CLUB
Ft86Club
RR Racing
Register Garage Members List Calendar Search Today's Posts Mark Forums Read

Go Back   Scion FR-S Forum | Subaru BRZ Forum | Toyota 86 GT 86 Forum | AS1 Forum - FT86CLUB > Technical Topics > Tracking / Autocross / HPDE / Drifting

Tracking / Autocross / HPDE / Drifting What these cars were built for!


User Tag List

Reply
 
Thread Tools Search this Thread
Old 05-06-2017, 11:21 PM   #1
Sleepless
Senior Member
 
Sleepless's Avatar
 
Join Date: Apr 2014
Drives: 2014 BRZ
Location: Redmond, WA
Posts: 635
Thanks: 297
Thanked 386 Times in 226 Posts
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Steering rack options?

Is there a steering rack that fixes the inconsistent boost issues at the track?
__________________
Sleepless is offline   Reply With Quote
Old 05-09-2017, 03:01 PM   #2
Element Tuning
Senior Member
 
Join Date: Jun 2012
Drives: Hydra EMS Powered FRS Raven Black
Location: Maryland
Posts: 839
Thanks: 54
Thanked 1,011 Times in 364 Posts
Mentioned: 59 Post(s)
Tagged: 2 Thread(s)
How bad is it? I found too much caster make it horrible and the power steering turns on and off. I still get it every now and then without additional caster but it's not all the time.
Element Tuning is offline   Reply With Quote
Old 05-09-2017, 03:31 PM   #3
ApexEight
Senior Member
 
Join Date: Apr 2017
Drives: 2014 Subaru BRZ Limited 6MT SSM
Location: Atlanta, GA, USA
Posts: 293
Thanks: 195
Thanked 68 Times in 54 Posts
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
I've has the power steering cut out for a split second during regular driving conditions and even in parking lots. Has happened twice in like the past month. Feels really unnerving. I believe I'm on stock alignment settings. Interested to hear if there is a solution to this.
ApexEight is offline   Reply With Quote
Old 05-09-2017, 03:37 PM   #4
Sleepless
Senior Member
 
Sleepless's Avatar
 
Join Date: Apr 2014
Drives: 2014 BRZ
Location: Redmond, WA
Posts: 635
Thanks: 297
Thanked 386 Times in 226 Posts
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by Element Tuning View Post
How bad is it? I found too much caster make it horrible and the power steering turns on and off. I still get it every now and then without additional caster but it's not all the time.
On sticky Trofeo Rs its multiple turns per lap at the Ridge Motorsports Park!

I can live with it, but sure wish I didn't have to.

What is your caster at?
__________________

Last edited by Sleepless; 05-09-2017 at 05:20 PM.
Sleepless is offline   Reply With Quote
Old 05-09-2017, 03:40 PM   #5
Element Tuning
Senior Member
 
Join Date: Jun 2012
Drives: Hydra EMS Powered FRS Raven Black
Location: Maryland
Posts: 839
Thanks: 54
Thanked 1,011 Times in 364 Posts
Mentioned: 59 Post(s)
Tagged: 2 Thread(s)
Quote:
Originally Posted by Sleepless View Post
On sticky Trofeo Rs its multiple turns per lap at the Ridge Motorsports Park!

I can live with it, but sure which I didn't have to.

What is your caster at?
Oh I had a huge problem with shutting off under trail braking (at least 3 turns a lap). It does make it hard to drive a consistent line when you go from barely holding the whee to straight up man handling it! I just run OEM caster now. It has been dramatically reduced but on occasion I still get it.
Element Tuning is offline   Reply With Quote
The Following 2 Users Say Thank You to Element Tuning For This Useful Post:
Pat (05-09-2017), Sleepless (05-09-2017)
Old 05-09-2017, 05:20 PM   #6
Sleepless
Senior Member
 
Sleepless's Avatar
 
Join Date: Apr 2014
Drives: 2014 BRZ
Location: Redmond, WA
Posts: 635
Thanks: 297
Thanked 386 Times in 226 Posts
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Yes, trail braking and highly cambered turns!

I thought I'd read that the new cars don't have the problem so I was hoping some might have tried changing to the newer rack, if indeed they are different.
__________________
Sleepless is offline   Reply With Quote
Old 05-09-2017, 05:59 PM   #7
strat61caster
Thread Killer
 
strat61caster's Avatar
 
Join Date: Nov 2012
Drives: '13 FRS
Location: SF Bay Area
Posts: 9,026
Thanks: 12,381
Thanked 8,162 Times in 4,265 Posts
Mentioned: 77 Post(s)
Tagged: 3 Thread(s)
Quote:
Originally Posted by Sleepless View Post
Yes, trail braking and highly cambered turns!

I thought I'd read that the new cars don't have the problem so I was hoping some might have tried changing to the newer rack, if indeed they are different.
It has less to do with the rack and more to do with the power steering, iirc speculation was that it was hot and/or overloaded shutting down to prevent damage to the unit.

If you get under the car the rack is just a straight rack and pinion, the power assist lives behind the dashboard connecting to the steering wheel shaft before it enters the steering rack. If there's an improved unit it'll be that.

Steering shaft and power steering unit:





Steering rack:



Changing the rack itself won't help the problem, maybe if you change the ratio that could lighten the load on the EPS, but you'll have lighter steering feel and require more steering input to get the wheel turned the same amount. And no guarantee the power steering system will coordinate happily with the new ratio, it could go haywire.

Good info out of Element Tuning that increased caster worsens the effect which feeds into the overloading/overheating theory. Maybe that was known before but I don't recall.
__________________
Quote:
Originally Posted by Guff View Post
ineedyourdiddly
strat61caster is offline   Reply With Quote
The Following User Says Thank You to strat61caster For This Useful Post:
Sleepless (05-09-2017)
Old 05-09-2017, 06:03 PM   #8
Yoshoobaroo
Torque BuffaloChicken Dip
 
Yoshoobaroo's Avatar
 
Join Date: Mar 2016
Drives: 2013 BRZ
Location: Florida
Posts: 1,435
Thanks: 685
Thanked 1,014 Times in 562 Posts
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Garage
Holy crap no way! It's actually a manual rack? Does this mean we can do an easy PS delete?


Sent from my iPhone using Tapatalk
Yoshoobaroo is offline   Reply With Quote
Old 05-09-2017, 06:27 PM   #9
strat61caster
Thread Killer
 
strat61caster's Avatar
 
Join Date: Nov 2012
Drives: '13 FRS
Location: SF Bay Area
Posts: 9,026
Thanks: 12,381
Thanked 8,162 Times in 4,265 Posts
Mentioned: 77 Post(s)
Tagged: 3 Thread(s)
Quote:
Originally Posted by Yoshoobaroo View Post
Holy crap no way! It's actually a manual rack? Does this mean we can do an easy PS delete?


Sent from my iPhone using Tapatalk
Hypothetically, yes. I don't know what it does to the traction control system as a whole though, you might lose ABS, there have been a couple threads on it but I don't recall anything conclusive.
__________________
Quote:
Originally Posted by Guff View Post
ineedyourdiddly
strat61caster is offline   Reply With Quote
Old 05-09-2017, 06:45 PM   #10
OND
Senior Member
 
OND's Avatar
 
Join Date: May 2016
Drives: '15 BRZ
Location: Austin, TX
Posts: 193
Thanks: 127
Thanked 195 Times in 83 Posts
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
How about reducing electric assist, so that the motor doesn't overheat? Sounds so doable...
OND is offline   Reply With Quote
Old 05-09-2017, 07:44 PM   #11
tony-brz
Member
 
tony-brz's Avatar
 
Join Date: Dec 2016
Drives: '17 BRZ PP
Location: Portland, OR
Posts: 56
Thanks: 52
Thanked 40 Times in 25 Posts
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Thought I'd post this. The power steering definitely has overheating protection. This is from the my 2017 BRZ manual:
tony-brz is offline   Reply With Quote
The Following User Says Thank You to tony-brz For This Useful Post:
strat61caster (05-09-2017)
Old 05-10-2017, 09:21 AM   #12
Rampage
Senior Member/Old Fanboi
 
Rampage's Avatar
 
Join Date: Nov 2011
Drives: 2000 2ZZ-GE MR2 Spyder HT
Location: NoFL
Posts: 2,364
Thanks: 1,778
Thanked 1,892 Times in 865 Posts
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Sounds like adding heatsinks and/or a small fan might help.
__________________
So many modders have more cents than sense!
Rampage is offline   Reply With Quote
Old 05-10-2017, 11:43 AM   #13
Sleepless
Senior Member
 
Sleepless's Avatar
 
Join Date: Apr 2014
Drives: 2014 BRZ
Location: Redmond, WA
Posts: 635
Thanks: 297
Thanked 386 Times in 226 Posts
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by Rampage View Post
Sounds like adding heatsinks and/or a small fan might help.
For me, it's not heat-related. I can make it happen in the first corner on a cold day and it is consistent throughout a 30 minute session. It's purely load related. My guess is that it reduces the assist to prevent overheating once it detects a heavy load.

I'd rather set it to reduced-assist full time when on the track so it is consistent. I wonder if it is a closed system or if it is controlled by the ECU. If the latter, maybe Beastronix could add a reduced-assist mode to the 86nanny?

[EDIT: I've contacted Beastronix if they can do this. Told them I'd pay $200 for such a feature; easily. Let them know if you are also interested and how much it is worth to you. Even if it isn't ECU controlled, I bet they can figure out how to put a manual switch directly to the assist controller! Fingers crossed...]
__________________

Last edited by Sleepless; 05-10-2017 at 12:30 PM.
Sleepless is offline   Reply With Quote
The Following User Says Thank You to Sleepless For This Useful Post:
Jonsey (05-10-2017)
Old 05-10-2017, 12:27 PM   #14
Yoshoobaroo
Torque BuffaloChicken Dip
 
Yoshoobaroo's Avatar
 
Join Date: Mar 2016
Drives: 2013 BRZ
Location: Florida
Posts: 1,435
Thanks: 685
Thanked 1,014 Times in 562 Posts
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Garage
Quote:
Originally Posted by Sleepless View Post
For me, it's not heat-related. I can make it happen in the first corner on a cold day and it is consistent throughout a 30 minute session. It's purely load related. My guess is that it reduces the assist to prevent overheating once it detects a heavy load.

I'd rather set it to recuced-assist full time when on the track so it is consistent. I wonder if it is a closed system or if it is controlled by the ECU. If the latter, maybe Beastronix could add a reduced-assist mode to the 86nanny?


What happens if you pull the PS fuse?


Sent from my iPhone using Tapatalk
Yoshoobaroo is offline   Reply With Quote
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: OEM Steering Rack MicheleAbbate Brakes, Suspension, Chassis 0 04-18-2016 02:51 PM
Cusco steering rack stay olsonpg Suspension | Chassis | Brakes -- Sponsored by 949 Racing 6 07-27-2015 07:35 PM
TiC steering rack bushings review mokinbird87 Suspension | Chassis | Brakes -- Sponsored by 949 Racing 0 07-21-2014 12:43 PM
Steering Rack Play FR Sports CANADA 1 06-04-2014 09:00 PM
Steering rack diss7 Suspension | Chassis | Brakes -- Sponsored by 949 Racing 6 04-07-2014 12:12 AM


All times are GMT -4. The time now is 05:02 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Garage vBulletin Plugins by Drive Thru Online, Inc.