Dip at 1000rpm - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

phrosty · 06-03-2015, 09:05 PM

Hey guys, I'm getting an odd dip at around 1000rpm when I'm coasting to a stop and my foot is off the gas. Lasts for a fraction of a second, but is enough that you can feel the car make a slight lurch. Happens regardless of gear:

[ame]http://www.youtube.com/watch?v=bgdxVXlU4xk[/ame]

Any ideas?

humfrz · 06-03-2015, 09:13 PM

DANG, phrosty ....... it must be a slow day in Chicagoland .......

I'll guess that the ECU is just slightly bliping the throttle before the engine settles into idle mode. Sort of like bliping the throttle when downshifting...........

Ya'll fire away .....

humfrz

steve99 · 06-03-2015, 09:21 PM

Change all three (cold/warm/hot) pi/di ration tables to be full DI (ie zero in the 0.2/0.3 load columns up to 0.2 load or 0.3 if your auto.

see tune tweaks link below for more info

phrosty · 06-03-2015, 09:30 PM

Quote:

Originally Posted by steve99

Change all three (cold/warm/hot) pi/di ration tables to be full DI (ie zero in the 0.2/0.3 load columns up to 0.2 load or 0.3 if your auto.

see tune tweaks link below for more info

Will try this out, thanks. Steve, you're a machine

phrosty · 06-05-2015, 10:37 PM

Unfortunately changing those didn't do it. I'm going to look for exhaust leaks this weekend, maybe it's that. Praying it's not a bad trans

.

Can any other auto trans owners confirm if they have or don't have this?

Packofcrows · 06-08-2015, 01:35 PM

Have this on my manual. It sucks when i have full blast ac and it feels like its gonna turn off but it doesnt.

FRSBRZGT86FAN · 06-09-2015, 04:31 PM

Quote:

Originally Posted by phrosty

Unfortunately changing those didn't do it. I'm going to look for exhaust leaks this weekend, maybe it's that. Praying it's not a bad trans

.

Can any other auto trans owners confirm if they have or don't have this?

I have this on my 2015 and also have a weird issue occasionally when in reverse with a/c on and the engine is slightly cool it feels like it will stall but catches itself

Tcoat · 06-09-2015, 04:36 PM

Quote:

Originally Posted by FRSBRZGT86FAN

I have this on my 2015 and also have a weird issue occasionally when in reverse with a/c on and the engine is slightly cool it feels like it will stall but catches itself

Just AC compressor cutting in, not a problem, don't sweat it.

yomny · 06-09-2015, 04:58 PM

Same dilemma different flavor, Idle dip.. read around you'll get bored of seeing it being mentioned. It happens with defrost on, AC on.. reverse.. AT tranny.. nothing has been able to fix that, not dealer reflashes nor aftermarket. although aftermarket tunes have improved upon it. Just one of those things you will never find a fix or if you do by then you'll life will be ruined from all the headaches and sleepless nights trying to fix it. Somewhat like the crickets.

phrosty · 06-09-2015, 05:43 PM

This isn't the idle dip. I know the idle dip well

This is happening at a very specific RPM range, repeatably, with all of AC/defrost/etc. turned off.

yomny · 06-09-2015, 06:06 PM

Quote:

Originally Posted by phrosty

This isn't the idle dip. I know the idle dip well

This is happening at a very specific RPM range, repeatably, with all of AC/defrost/etc. turned off.

hmm.. another dip lol.. anyways keep us posted of any findings. Its always good to document these things for future help.

Wayno · 06-10-2015, 11:56 AM

If the car doesn't lurch and be uncomfortable, then I wouldn't stress about it.
It looks entirely tranny related, I would say no amount of engine tuning will fix it.

06-03-2015, 09:05 PM	#1
phrosty Senior Member Join Date: Apr 2013 Drives: 2013 FR-S Location: Seattle Posts: 806 Thanks: 202 Thanked 321 Times in 199 Posts Mentioned: 18 Post(s) Tagged: 1 Thread(s)	Dip at 1000rpm Hey guys, I'm getting an odd dip at around 1000rpm when I'm coasting to a stop and my foot is off the gas. Lasts for a fraction of a second, but is enough that you can feel the car make a slight lurch. Happens regardless of gear: [ame]http://www.youtube.com/watch?v=bgdxVXlU4xk[/ame] Any ideas? __________________ 2013 Whiteout 6AT FR-S \| Perrin Inlet Tube + 2.75" CAI \| OpenFlash Header \| P&L Catback \| 4.88 Final Drive \| Dialed in OFT 2.0x Stage 2 E85 \| 18x8 Enkei Raijin + 225/40 Michelin Pilot Super Sport \| 17x7 Stock + 215/45 Michelin X-Ice Xi-2

06-05-2015, 10:37 PM	#5
phrosty Senior Member Join Date: Apr 2013 Drives: 2013 FR-S Location: Seattle Posts: 806 Thanks: 202 Thanked 321 Times in 199 Posts Mentioned: 18 Post(s) Tagged: 1 Thread(s)	Unfortunately changing those didn't do it. I'm going to look for exhaust leaks this weekend, maybe it's that. Praying it's not a bad trans . Can any other auto trans owners confirm if they have or don't have this? __________________ 2013 Whiteout 6AT FR-S \| Perrin Inlet Tube + 2.75" CAI \| OpenFlash Header \| P&L Catback \| 4.88 Final Drive \| Dialed in OFT 2.0x Stage 2 E85 \| 18x8 Enkei Raijin + 225/40 Michelin Pilot Super Sport \| 17x7 Stock + 215/45 Michelin X-Ice Xi-2

06-08-2015, 01:35 PM	#6
Packofcrows hey you, yeah you <3 Join Date: Jul 2012 Drives: 2014 37J FR-S Location: Monterey County, CA Posts: 2,715 Thanks: 905 Thanked 1,259 Times in 809 Posts Mentioned: 38 Post(s) Tagged: 3 Thread(s)	Have this on my manual. It sucks when i have full blast ac and it feels like its gonna turn off but it doesnt. __________________ Got my TRD wheels and TRD louvers. Thanks!!!

06-09-2015, 04:58 PM	#9
yomny Senior Member Join Date: Jul 2012 Drives: 2013 FRS Whiteout Location: MIA Posts: 1,545 Thanks: 557 Thanked 469 Times in 340 Posts Mentioned: 33 Post(s) Tagged: 5 Thread(s)	Same dilemma different flavor, Idle dip.. read around you'll get bored of seeing it being mentioned. It happens with defrost on, AC on.. reverse.. AT tranny.. nothing has been able to fix that, not dealer reflashes nor aftermarket. although aftermarket tunes have improved upon it. Just one of those things you will never find a fix or if you do by then you'll life will be ruined from all the headaches and sleepless nights trying to fix it. Somewhat like the crickets. __________________ GTX2867R, moto-tuned , tomei op , motiv fp , Invidia Q300 ti , Rota titan 17x9 +42 , nt555 255/40 , ST coilovers w/cascam , Hotchkis sways

06-09-2015, 05:43 PM	#10
phrosty Senior Member Join Date: Apr 2013 Drives: 2013 FR-S Location: Seattle Posts: 806 Thanks: 202 Thanked 321 Times in 199 Posts Mentioned: 18 Post(s) Tagged: 1 Thread(s)	This isn't the idle dip. I know the idle dip well This is happening at a very specific RPM range, repeatably, with all of AC/defrost/etc. turned off. __________________ 2013 Whiteout 6AT FR-S \| Perrin Inlet Tube + 2.75" CAI \| OpenFlash Header \| P&L Catback \| 4.88 Final Drive \| Dialed in OFT 2.0x Stage 2 E85 \| 18x8 Enkei Raijin + 225/40 Michelin Pilot Super Sport \| 17x7 Stock + 215/45 Michelin X-Ice Xi-2

06-03-2015, 09:13 PM	#2
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 30,432 Thanks: 29,826 Thanked 32,845 Times in 16,844 Posts Mentioned: 715 Post(s) Tagged: 2 Thread(s)	DANG, phrosty ....... it must be a slow day in Chicagoland ....... I'll guess that the ECU is just slightly bliping the throttle before the engine settles into idle mode. Sort of like bliping the throttle when downshifting........... Ya'll fire away ..... humfrz

06-03-2015, 09:21 PM	#3
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,996 Thanks: 1,035 Thanked 4,994 Times in 2,984 Posts Mentioned: 598 Post(s) Tagged: 2 Thread(s)	Change all three (cold/warm/hot) pi/di ration tables to be full DI (ie zero in the 0.2/0.3 load columns up to 0.2 load or 0.3 if your auto. see tune tweaks link below for more info

06-10-2015, 11:56 AM	#12
Wayno Senior Member Join Date: Apr 2014 Drives: Toyota 86 GTS Location: Australia Posts: 1,129 Thanks: 453 Thanked 896 Times in 424 Posts Mentioned: 211 Post(s) Tagged: 0 Thread(s)	If the car doesn't lurch and be uncomfortable, then I wouldn't stress about it. It looks entirely tranny related, I would say no amount of engine tuning will fix it. __________________ rom downloads, information and examples Toyota 86 GTS OFT - Guide To Dialling In OTS Base Tune OFT - Example Alternate Maps for AT, 98RON, E85, MAF Scales

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