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

Go Back   Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB > Technical Topics > Software Tuning

Software Tuning Discuss all software tuning topics.


User Tag List

Reply
 
Thread Tools Search this Thread
Old 10-03-2024, 12:33 AM   #1
SOLID2223
Junior Member
 
Join Date: Oct 2024
Drives: Brz
Location: 23693
Posts: 5
Thanks: 0
Thanked 3 Times in 3 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
FLAT FOOT SHIFTING=ROLLING ANTILAG

Hello looking for some tuning experts opinions with my idea. I recently had a theory to use the FFS(flat foot shifting) feature integrated into the ecutek software as rolling anti lag. To my understanding for FFS to engage throttle must be at 100% and clutch has to be depressed. I was thinking about using a secondary switch for my clutch switch”tricking” the ECU into activating the FFS feature WITHOUT the clutch depressed. Hence creating”rolling anti lag). Yes I’m aware this isn’t true anti lag however it could be useful in building boost for stock motors while rolling. My main concern is the engine load would differ greatly because during FFS there is no load due to the clutch being depressed. So if the FFS feature were to be used as anti lag without a depressed clutch would the feature still function as designed?


Sent from my iPhone using Tapatalk
SOLID2223 is offline   Reply With Quote
Old 10-03-2024, 01:44 PM   #2
blsfrs
Senior Member
 
blsfrs's Avatar
 
Join Date: Dec 2018
Drives: 2013 frs base
Location: central Virginia
Posts: 1,264
Thanks: 2,092
Thanked 1,191 Times in 573 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by SOLID2223 View Post
Hello looking for some tuning experts opinions with my idea. I recently had a theory to use the FFS(flat foot shifting) feature integrated into the ecutek software as rolling anti lag. To my understanding for FFS to engage throttle must be at 100% and clutch has to be depressed. I was thinking about using a secondary switch for my clutch switch”tricking” the ECU into activating the FFS feature WITHOUT the clutch depressed. Hence creating”rolling anti lag). Yes I’m aware this isn’t true anti lag however it could be useful in building boost for stock motors while rolling. My main concern is the engine load would differ greatly because during FFS there is no load due to the clutch being depressed. So if the FFS feature were to be used as anti lag without a depressed clutch would the feature still function as designed?


Sent from my iPhone using Tapatalk
A couple of years ago, my tuner left FFS engaged. What is did was cause my engine to bog down as I was revving up and preparing to shift because I unconsciously put a light pressure on the clutch pedal.

A datalog showed that FFS dropped the ignition timing to 0* when the engine was over 4500 rpm and my foot touched the clutch.

So, in my nonexpert opinion, I don't think FFS will do what you are seeking.
blsfrs is offline   Reply With Quote
Old 10-03-2024, 02:02 PM   #3
SOLID2223
Junior Member
 
Join Date: Oct 2024
Drives: Brz
Location: 23693
Posts: 5
Thanks: 0
Thanked 3 Times in 3 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by blsfrs View Post
A couple of years ago, my tuner left FFS engaged. What is did was cause my engine to bog down as I was revving up and preparing to shift because I unconsciously put a light pressure on the clutch pedal.

A datalog showed that FFS dropped the ignition timing to 0* when the engine was over 4500 rpm and my foot touched the clutch.

So, in my nonexpert opinion, I don't think FFS will do what you are seeking.

Did the datalog show the rpm holding or increasing during the time FFS was active


Sent from my iPhone using Tapatalk
SOLID2223 is offline   Reply With Quote
Old 10-04-2024, 11:07 AM   #4
blsfrs
Senior Member
 
blsfrs's Avatar
 
Join Date: Dec 2018
Drives: 2013 frs base
Location: central Virginia
Posts: 1,264
Thanks: 2,092
Thanked 1,191 Times in 573 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by SOLID2223 View Post
Did the datalog show the rpm holding or increasing during the time FFS was active


Sent from my iPhone using Tapatalk
My butt dyno and the datalog showed rpms holding. It was like a governor or rev limiter kicking in.
blsfrs is offline   Reply With Quote
Old 10-04-2024, 01:37 PM   #5
SOLID2223
Junior Member
 
Join Date: Oct 2024
Drives: Brz
Location: 23693
Posts: 5
Thanks: 0
Thanked 3 Times in 3 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by blsfrs View Post
My butt dyno and the datalog showed rpms holding. It was like a governor or rev limiter kicking in.

So my theory was correct it will hold the rpm if the car is still in gear without the clutch depressed.


Sent from my iPhone using Tapatalk
SOLID2223 is offline   Reply With Quote
The Following User Says Thank You to SOLID2223 For This Useful Post:
blsfrs (10-04-2024)
Old 10-09-2024, 12:56 PM   #6
blsfrs
Senior Member
 
blsfrs's Avatar
 
Join Date: Dec 2018
Drives: 2013 frs base
Location: central Virginia
Posts: 1,264
Thanks: 2,092
Thanked 1,191 Times in 573 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by SOLID2223 View Post
So my theory was correct it will hold the rpm if the car is still in gear without the clutch depressed.


Sent from my iPhone using Tapatalk
I was pondering your idea. You may not have to install an extra switch. The clutch switch will "activate" with enough pressure to move the pedal a pube hair's distance. You could experiment by turning the cruise control off by touching the clutch pedal.
blsfrs is offline   Reply With Quote
Old 10-09-2024, 06:09 PM   #7
SOLID2223
Junior Member
 
Join Date: Oct 2024
Drives: Brz
Location: 23693
Posts: 5
Thanks: 0
Thanked 3 Times in 3 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by blsfrs View Post
I was pondering your idea. You may not have to install an extra switch. The clutch switch will "activate" with enough pressure to move the pedal a pube hair's distance. You could experiment by turning the cruise control off by touching the clutch pedal.

I understand your idea however your clutch assembly already has preload and barely pressing the clutch could cause abnormal damage to the clutch pressure plate and throw out bearing. That’s why people say don’t ride the clutch. Along with slippage from the friction disc.


Sent from my iPhone using Tapatalk
SOLID2223 is offline   Reply With Quote
The Following User Says Thank You to SOLID2223 For This Useful Post:
blsfrs (10-10-2024)
Old 10-10-2024, 09:39 AM   #8
blsfrs
Senior Member
 
blsfrs's Avatar
 
Join Date: Dec 2018
Drives: 2013 frs base
Location: central Virginia
Posts: 1,264
Thanks: 2,092
Thanked 1,191 Times in 573 Posts
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by SOLID2223 View Post
I understand your idea however your clutch assembly already has preload and barely pressing the clutch could cause abnormal damage to the clutch pressure plate and throw out bearing. That’s why people say don’t ride the clutch. Along with slippage from the friction disc.


Sent from my iPhone using Tapatalk
You might be surprised how little pressure it takes on the clutch pedal to active the clutch switch. It's not enough to cause any problems with the clutch.
blsfrs is offline   Reply With Quote
The Following User Says Thank You to blsfrs For This Useful Post:
Ultramaroon (10-10-2024)
Old 10-10-2024, 10:01 PM   #9
SOLID2223
Junior Member
 
Join Date: Oct 2024
Drives: Brz
Location: 23693
Posts: 5
Thanks: 0
Thanked 3 Times in 3 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by blsfrs View Post
You might be surprised how little pressure it takes on the clutch pedal to active the clutch switch. It's not enough to cause any problems with the clutch.

I will try it out and see how sensitive the switch is and I will go from there


Sent from my iPhone using Tapatalk
SOLID2223 is offline   Reply With Quote
The Following User Says Thank You to SOLID2223 For This Useful Post:
blsfrs (10-11-2024)
 
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
OFT's Flat Foot shifting question Swole Software Tuning 2 03-01-2019 07:31 PM
Flat foot shifting won't let me redline! Dr. BRZ Software Tuning 2 03-27-2018 02:40 AM
racerom flat foot shifting ft86me Engine, Exhaust, Transmission 10 07-25-2013 04:02 PM
EcuTek RaceRom Flat Foot Shifting ! Visconti Engine, Exhaust, Transmission 79 11-14-2012 10:36 PM


All times are GMT -4. The time now is 05:14 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
User Alert System provided by Advanced User Tagging v3.3.0 (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.

Garage vBulletin Plugins by Drive Thru Online, Inc.