RPM dip with A/C running - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Dalers08 · 06-11-2013, 10:48 PM

Quote:

Originally Posted by SloS14

I think the load on the engine itself to run the compressor is much more of the problem than the load on the electrical system.

Good catch, forgot to mention that!

The Sentinel · 03-26-2014, 07:12 PM

Glad I found this thread. My brand new BRZ has less than 500km on the odometer and I noticed this last night.

Like you guys, only with the AC on and only when idling.

With AC off the car idles perfectly at around 600 RPM.

SloS14 · 03-26-2014, 07:20 PM

Doesn't happen anymore since flashing with OFT.

Sookainian · 03-27-2014, 06:19 AM

same here with A/C on it dip. What is OFT

SloS14 · 03-27-2014, 07:50 AM

Open Flash Tablet.

Mikem53 · 03-27-2014, 08:59 AM

Quote:

Originally Posted by BunnyRZed

It seems to happen only when the A/C is running and I'm coming to a stop.

Exactly.. Not all the time.. But under certain conditions, when coming to a stop, the idle dips and the engine shakes as it recovers... Then it's fine again even the with compressor cycling on and off..

SmsAlSuwaidi · 03-27-2014, 09:03 AM

Every single car I've owned and driven dips with the ac on.

jdubz13frs · 03-27-2014, 09:22 AM

Definetly normal, every car i've owned does this. As others have stated, the engine has to compensate for the load of the a/c coming on, since the a/c cycles (satys on for a few mintues, turns off, vice versa), the engine has varying loads. it's important to remember when you're at idle your throttle plate is closed and the engine is running of the idle air control which doesn't flow much. especially when there are other loads on the system as the engine idles (power steering being used? radio loud), it can put quite a strain on an engine running at 700 rpm only flowing 2 g/s air.

andrew20195 · 03-27-2014, 10:29 AM

http://www.ft86club.com/forums/showthread.php?t=61708

Bam! Just came out yesterday.

yomny · 03-27-2014, 10:30 AM

This while is not normal, it is to mr.frs I think it could have something to do with the idle being too low and while coming to a stop the ac compressor load may cause it to stumble before recovering. I've started a thread here to discuss this along with potential fixes via tuning. I've been told(vendors here) that with a simple idle speed raise, the engine won't drop as low when the AC compressor cycles.

PS- i've even taken the car to the dealer to claim the TSB fix for this precise issue. They "flashed" and nothing changed. I say it in quotations because i think they did nothing. If it helps, i've been practicing my heal-toe while coming to a stop with AC on prevent this lol, gotta make the best of the worst.

BunnyRZed · 03-28-2014, 11:01 AM

Here's the TSB main page:

Click Here

Here's the TSB download link for this issue:

Click Here

Dboe · 08-14-2014, 10:06 PM

Has anyone actually tried re-flashing already?
I have an openflash and have a different map on it, so it should have already fixed it. However, i notice this issue everytime.

yomny · 08-15-2014, 05:25 PM

I already did the tsb, not sure if is the same one as mentioned above but I would try to avoid taking my car to the dealer again. Hopefully once I tune the tuner could take a look at this. Seems that when the AC clutch kicks it drops the idle.

Pcharliep04 · 08-24-2014, 03:47 PM

so has anyone tried the tbs for frs in idle dip when the ac is on ????

03-27-2014, 09:03 AM	#21
SmsAlSuwaidi Boosted Join Date: Feb 2013 Drives: Not a supra....yet Location: Riverside,CA/ Abu Dhabi,UAE Posts: 2,925 Thanks: 487 Thanked 1,203 Times in 812 Posts Mentioned: 90 Post(s)	Every single car I've owned and driven dips with the ac on. __________________ https://www.facebook.com/Smsalsuwaidiracing/

03-27-2014, 10:30 AM	#24
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)	RPM dip with A/C running This while is not normal, it is to mr.frs I think it could have something to do with the idle being too low and while coming to a stop the ac compressor load may cause it to stumble before recovering. I've started a thread here to discuss this along with potential fixes via tuning. I've been told(vendors here) that with a simple idle speed raise, the engine won't drop as low when the AC compressor cycles. PS- i've even taken the car to the dealer to claim the TSB fix for this precise issue. They "flashed" and nothing changed. I say it in quotations because i think they did nothing. If it helps, i've been practicing my heal-toe while coming to a stop with AC on prevent this lol, gotta make the best of the worst. __________________ GTX2867R, moto-tuned , tomei op , motiv fp , Invidia Q300 ti , Rota titan 17x9 +42 , nt555 255/40 , ST coilovers w/cascam , Hotchkis sways Last edited by yomny; 03-27-2014 at 01:40 PM.

08-15-2014, 05:25 PM	#27
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)	I already did the tsb, not sure if is the same one as mentioned above but I would try to avoid taking my car to the dealer again. Hopefully once I tune the tuner could take a look at this. Seems that when the AC clutch kicks it drops the idle. __________________ GTX2867R, moto-tuned , tomei op , motiv fp , Invidia Q300 ti , Rota titan 17x9 +42 , nt555 255/40 , ST coilovers w/cascam , Hotchkis sways

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03-26-2014, 07:12 PM	#16
The Sentinel Project BRZ-Boosted Autos Join Date: Nov 2013 Drives: MY14 BRZ Location: Australia Posts: 121 Thanks: 15 Thanked 154 Times in 45 Posts Mentioned: 2 Post(s)	Glad I found this thread. My brand new BRZ has less than 500km on the odometer and I noticed this last night. Like you guys, only with the AC on and only when idling. With AC off the car idles perfectly at around 600 RPM.

03-26-2014, 07:20 PM	#17
SloS14 Senior Member Join Date: Apr 2013 Drives: 2013 FR-S whiteout Location: United States Posts: 726 Thanks: 381 Thanked 652 Times in 256 Posts Mentioned: 3 Post(s)	Doesn't happen anymore since flashing with OFT.

03-27-2014, 06:19 AM	#18
Sookainian Senior Member Join Date: Mar 2013 Drives: Toyota GT86 Location: Singapore Posts: 145 Thanks: 7 Thanked 13 Times in 10 Posts Mentioned: 2 Post(s)	same here with A/C on it dip. What is OFT

03-27-2014, 07:50 AM	#19
SloS14 Senior Member Join Date: Apr 2013 Drives: 2013 FR-S whiteout Location: United States Posts: 726 Thanks: 381 Thanked 652 Times in 256 Posts Mentioned: 3 Post(s)	Open Flash Tablet.

03-27-2014, 09:22 AM	#22
jdubz13frs Member Join Date: Jul 2013 Drives: 2013 Scion FR-S 6MT Location: Canandaigua, NY Posts: 45 Thanks: 25 Thanked 18 Times in 14 Posts Mentioned: 0 Post(s)	Definetly normal, every car i've owned does this. As others have stated, the engine has to compensate for the load of the a/c coming on, since the a/c cycles (satys on for a few mintues, turns off, vice versa), the engine has varying loads. it's important to remember when you're at idle your throttle plate is closed and the engine is running of the idle air control which doesn't flow much. especially when there are other loads on the system as the engine idles (power steering being used? radio loud), it can put quite a strain on an engine running at 700 rpm only flowing 2 g/s air.

03-27-2014, 10:29 AM	#23
andrew20195 Senior Member Join Date: Mar 2013 Drives: 2013 Subaru BRZ Location: Baton Rouge Posts: 321 Thanks: 154 Thanked 104 Times in 78 Posts Mentioned: 1 Post(s)	http://www.ft86club.com/forums/showthread.php?t=61708 Bam! Just came out yesterday.

03-28-2014, 11:01 AM	#25
BunnyRZed Senior Member Join Date: Dec 2012 Drives: BRZ Limited [37J] Location: Sacramento, CA Posts: 328 Thanks: 60 Thanked 135 Times in 87 Posts Mentioned: 27 Post(s)	Here's the TSB main page: Click Here Here's the TSB download link for this issue: Click Here

08-14-2014, 10:06 PM	#26
Dboe Member Join Date: Dec 2012 Drives: 2013 Red FRS Location: Santa Clara Posts: 96 Thanks: 0 Thanked 12 Times in 11 Posts Mentioned: 10 Post(s)	Has anyone actually tried re-flashing already? I have an openflash and have a different map on it, so it should have already fixed it. However, i notice this issue everytime.

08-24-2014, 03:47 PM	#28
Pcharliep04 Member Join Date: May 2013 Drives: Fr-s Location: Friendawood Posts: 35 Thanks: 1 Thanked 1 Time in 1 Post Mentioned: 0 Post(s)	so has anyone tried the tbs for frs in idle dip when the ac is on ????

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