The "Pedal Dance" testing - Page 12 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

DougW · 11-01-2013, 03:27 PM

Brake pressure, , 4 wheel speeds, lng rate, lng value ,lat G, traction switch and VSC switch all are hard inputs to the ABS ecu so unless the EFI ecu's throttle postion,load etc trigger it or the power streering position rate I'm not sure if a CAN solution will work. It may require a hack to the ABS ecu to turn this feature off for an off road only app. Need to be able to repeat it to find and fix it.
DougW

7thgear · 11-01-2013, 03:30 PM

shoulda bought an E30 and called it a day, lol

DougW · 11-01-2013, 03:38 PM

Quote:

Originally Posted by 7thgear

shoulda bought an E30 and called it a day, lol

Bring Money With you E30? yea they don't have any ecu issues.
DougW

7thgear · 11-01-2013, 03:59 PM

Quote:

Originally Posted by DougW

Bring Money With you E30? yea they don't have any ecu issues.
DougW

i dunno, the guys i know that run their old E30 323s and what not seem to be on reasonable budgets.

DougW · 11-01-2013, 10:02 PM

These are new cars with a few new things to work out, The BMWobbly have been around with blown head gaskets and cam followers that got worked out. This is still a great platform to drive and race, give us a little while to debug some of the minor things, hard to complain about 35mpg 200hp. Stay positive!!!!!
DougW

AceHeader-MT · 11-04-2013, 06:00 AM

Quote:

Originally Posted by Jeffsu350

My pedal dance testing

Thank you!

diss7 · 11-04-2013, 06:22 AM

1. Pull abs fuse
2. Profit

7thgear · 11-04-2013, 01:14 PM

Quote:

Originally Posted by diss7

1. Pull abs fuse
2. Profit

but i want ABS when i want it

i just don't want ABS when i don't want it.

ML · 11-04-2013, 01:46 PM

Quote:

Originally Posted by 7thgear

but i want ABS when i want it

i just don't want ABS when i don't want it.

make a switch

7thgear · 11-04-2013, 01:49 PM

Quote:

Originally Posted by ML

make a switch

not sure if bad joke or sign of ignorance...

Godzilla35 · 11-04-2013, 07:16 PM

so I bought the FRS to primarily learn how to drift... just FYI to my posts. But the pedal dance, like I mentioned before... caused grinding and dead pedal when I was rolling backwards after a spinout.

I went to all star bash and got a ride along with the Parts Shop MAX car with Dan the owner. He had no problems with anything I've experienced but I noticed his ABS light was on. He told me that he pulled / ziptied the ABS sensors from the front wheels and he doesn't run into any problems. I'm told it's really easy and you could do it even without jacking the car up and I'm going to try to do it for my next skidpad day... but I do wonder if there was an ability to make a switch for the ABS sensors to be deactivated or at least make a quick switch for the "full" t/c off mode switch.

CSG Mike · 11-04-2013, 08:08 PM

Quote:

Originally Posted by Godzilla35

so I bought the FRS to primarily learn how to drift... just FYI to my posts. But the pedal dance, like I mentioned before... caused grinding and dead pedal when I was rolling backwards after a spinout.

I went to all star bash and got a ride along with the Parts Shop MAX car with Dan the owner. He had no problems with anything I've experienced but I noticed his ABS light was on. He told me that he pulled / ziptied the ABS sensors from the front wheels and he doesn't run into any problems. I'm told it's really easy and you could do it even without jacking the car up and I'm going to try to do it for my next skidpad day... but I do wonder if there was an ability to make a switch for the ABS sensors to be deactivated or at least make a quick switch for the "full" t/c off mode switch.

I've never had a problem hooning. If you spin out, you need to turn off and PULL THE KEY OUT, before restarting the car. Otherwise, the electronics stay in freaked out mode.

autoXracer · 11-04-2013, 10:24 PM

Anyone noticed understeer with pedal dance?

I know in autocross some prefer the pedal dance and some don't. Last weekend we had autocrosses Saturday and Sunday. Pretty much same weather, same site, same car (RTR setup), Except for different courses on the 2 days.

I tried the pedal dance on a few runs and noticed understeer. Wasn't necessarily a bad thing depending on the course. I was faster with some oversteer (without pedal dance) on Saturday's course. On Sunday I was faster with some understeer (with pedal dance).

Anyone experience understeer with pedal dance? Oh and let me add I'm no pro, so it could be just my driving.

Element Tuning · 11-04-2013, 10:43 PM

Sorry guys what I'm talking about with pedal overlap is not "ice mode." It's simply the DBW throttle closing too slowly therefore delaying engine vacuum and subsequently brake booster assist. Pump the brake pedal while the engine is running, feels spongy with lots of travel, now engine off, pump the brake, and now it will be rock hard.

So if you transition from throttle to brake fast enough, you will be greated with that rock hard pedal and no vacuum assist momentarily. The brake booster is a mechanical device so you can't trick it.

"Ice Mode" has something to do with the ABS computer programming in response to the wheel speed data. I believe it's a response to excessive ABS intervention so to further reduce potential lock up its reducing line pressure via the ABS pump.

11-01-2013, 03:30 PM	#156
7thgear i'm sorry, what? Join Date: Jan 2012 Drives: Canada Location: I rock a beat harder than you can beat it with rocks Posts: 4,399 Thanks: 357 Thanked 2,506 Times in 1,268 Posts Mentioned: 40 Post(s) Tagged: 3 Thread(s)	shoulda bought an E30 and called it a day, lol __________________ don't you think if I was wrong, I'd know it?

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11-01-2013, 03:27 PM	#155
DougW Senior Member Join Date: May 2013 Drives: FR-S stock for now Location: SC Posts: 160 Thanks: 3 Thanked 171 Times in 81 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Brake pressure, , 4 wheel speeds, lng rate, lng value ,lat G, traction switch and VSC switch all are hard inputs to the ABS ecu so unless the EFI ecu's throttle postion,load etc trigger it or the power streering position rate I'm not sure if a CAN solution will work. It may require a hack to the ABS ecu to turn this feature off for an off road only app. Need to be able to repeat it to find and fix it. DougW

11-01-2013, 10:02 PM	#159
DougW Senior Member Join Date: May 2013 Drives: FR-S stock for now Location: SC Posts: 160 Thanks: 3 Thanked 171 Times in 81 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	These are new cars with a few new things to work out, The BMWobbly have been around with blown head gaskets and cam followers that got worked out. This is still a great platform to drive and race, give us a little while to debug some of the minor things, hard to complain about 35mpg 200hp. Stay positive!!!!! DougW

11-04-2013, 06:22 AM	#161
diss7 Banned Join Date: Sep 2012 Drives: AE86, 2x GT86, TE27 Location: Christchurch NZ Posts: 1,478 Thanks: 826 Thanked 1,179 Times in 522 Posts Mentioned: 33 Post(s) Tagged: 0 Thread(s)	1. Pull abs fuse 2. Profit

11-04-2013, 07:16 PM	#165
Godzilla35 Senior Member Join Date: May 2011 Drives: Nissan GT-R Location: SoCali Posts: 436 Thanks: 425 Thanked 84 Times in 58 Posts Mentioned: 3 Post(s) Tagged: 1 Thread(s)	so I bought the FRS to primarily learn how to drift... just FYI to my posts. But the pedal dance, like I mentioned before... caused grinding and dead pedal when I was rolling backwards after a spinout. I went to all star bash and got a ride along with the Parts Shop MAX car with Dan the owner. He had no problems with anything I've experienced but I noticed his ABS light was on. He told me that he pulled / ziptied the ABS sensors from the front wheels and he doesn't run into any problems. I'm told it's really easy and you could do it even without jacking the car up and I'm going to try to do it for my next skidpad day... but I do wonder if there was an ability to make a switch for the ABS sensors to be deactivated or at least make a quick switch for the "full" t/c off mode switch.

11-04-2013, 10:43 PM	#168
Element Tuning Senior Member Join Date: Jun 2012 Drives: Hydra EMS Powered FRS Raven Black Location: Maryland Posts: 839 Thanks: 54 Thanked 1,021 Times in 365 Posts Mentioned: 61 Post(s) Tagged: 2 Thread(s)	Sorry guys what I'm talking about with pedal overlap is not "ice mode." It's simply the DBW throttle closing too slowly therefore delaying engine vacuum and subsequently brake booster assist. Pump the brake pedal while the engine is running, feels spongy with lots of travel, now engine off, pump the brake, and now it will be rock hard. So if you transition from throttle to brake fast enough, you will be greated with that rock hard pedal and no vacuum assist momentarily. The brake booster is a mechanical device so you can't trick it. "Ice Mode" has something to do with the ABS computer programming in response to the wheel speed data. I believe it's a response to excessive ABS intervention so to further reduce potential lock up its reducing line pressure via the ABS pump.

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