RPM Drop when revving? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

G17BRZ · 03-12-2017, 11:29 PM

Hi everyone, I'm new here with a 2017 BRZ with PP. I have searched the forums for this but haven't found anything... When I rev up the motor the RPMs will die pretty significantly before revving up, and in other people's videos it doesn't seem to do this. Anyone know whats going on? Heres a video...

radroach · 03-12-2017, 11:45 PM

Need to clarify, are you blipping the throttle yourself or is it the engine that is doing that itself? Otherwise I can't tell what the problem is except your not breathing on the throttle enough to rev it up.

G17BRZ · 03-12-2017, 11:49 PM

I am blipping the throttle over and over, but each time I tap the gas the Revs seem to drop right before going up

ToySub1946 · 03-12-2017, 11:53 PM

If I were the service writer:

Situation normal. Adjust the customer, not the car.

dhuang · 03-12-2017, 11:59 PM

Good luck with a lightened flywheel...

radroach · 03-13-2017, 12:43 AM

Well the engine can't just respond in the manner you're asking it. Your opening and closing the throttle shut at low rpms so the engine is trying to breathe and adjust to what you're doing. I think first there has to be some time for pre-enrichment otherwise it'll just be sucking air.

When I rev I do it easily first, and then just breathe into the throttle. I don't tap.

radroach · 03-13-2017, 12:45 AM

Then again I could be totally wrong. It's kinda hard to tell what's wrong without seeing what your feet are doing.

G17BRZ · 03-13-2017, 01:01 AM

Quote:

Originally Posted by radroach

Then again I could be totally wrong. It's kinda hard to tell what's wrong without seeing what your feet are doing.

I am just tapping the gas and not allowing he throttle to breathe, just my Z didn't react the same way. It could be completely normal for this car and I could be totally overthinking it. Thank you though!

radroach · 03-13-2017, 01:09 AM

@G17BRZ the throttle response should become more refined through normal and spririted driving. If your car is brand new or the battery disconnected recently then the car takes time to re-learn, and can be laggy in the duration.

Ultramaroon · 03-13-2017, 01:13 AM

krayzie · 03-13-2017, 01:14 AM

Quote:

Originally Posted by G17BRZ

I am just tapping the gas and not allowing he throttle to breathe, just my Z didn't react the same way. It could be completely normal for this car and I could be totally overthinking it. Thank you though!

Your Z probably had rev hang which is something you don't want in a car cuz it will mess with your timing on rev match.

Just a guess cuz I don't really know what the problem is from the video lol!

guybo · 03-13-2017, 07:08 AM

So the complaint is that when you let up on on the gas, the revs drop? Am i missing something?

guybo · 03-13-2017, 07:09 AM

It could be a troll post, the YT video is labeled

Quote:

Category Comedy
License Standard YouTube License

Oxyg3n · 03-13-2017, 08:05 PM

@G17BRZ I believe that is normal. I had the same question when I first got the car but no others seem to understand what I was getting at. I haven't experienced other cars doing this either, this is a first(I know the pre-2017 didn't dip in rpm before it revs)

Sent from my SAMSUNG-SM-G920A using Tapatalk

03-12-2017, 11:29 PM	#1
G17BRZ Junior Member Join Date: Nov 2016 Drives: 2017 BRZ limited performance pack Location: California Posts: 7 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	RPM Drop when revving? Hi everyone, I'm new here with a 2017 BRZ with PP. I have searched the forums for this but haven't found anything... When I rev up the motor the RPMs will die pretty significantly before revving up, and in other people's videos it doesn't seem to do this. Anyone know whats going on? Heres a video...

03-13-2017, 01:13 AM	#10
Ultramaroon not playing cards Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,395 Thanks: 53,053 Thanked 37,228 Times in 19,308 Posts Mentioned: 1118 Post(s) Tagged: 9 Thread(s)	__________________ service manuals

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03-12-2017, 11:45 PM	#2
radroach Senior Member Join Date: Feb 2013 Drives: car Location: usa Posts: 2,162 Thanks: 1,028 Thanked 867 Times in 530 Posts Mentioned: 35 Post(s) Tagged: 1 Thread(s)	Need to clarify, are you blipping the throttle yourself or is it the engine that is doing that itself? Otherwise I can't tell what the problem is except your not breathing on the throttle enough to rev it up.

03-12-2017, 11:49 PM	#3
G17BRZ Junior Member Join Date: Nov 2016 Drives: 2017 BRZ limited performance pack Location: California Posts: 7 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I am blipping the throttle over and over, but each time I tap the gas the Revs seem to drop right before going up

03-12-2017, 11:53 PM	#4
ToySub1946 Senior Member Join Date: Oct 2014 Drives: 15FRS, 05MustangGT, 85Toyota truck Location: Eureka, Ca. Posts: 573 Thanks: 672 Thanked 590 Times in 279 Posts Mentioned: 5 Post(s) Tagged: 1 Thread(s)	If I were the service writer: Situation normal. Adjust the customer, not the car.

03-12-2017, 11:59 PM	#5
dhuang Cannonball Record Guy Join Date: Jul 2012 Drives: Series.Yellow, 4C, Fit Location: Houston / Atlanta Posts: 493 Thanks: 480 Thanked 429 Times in 223 Posts Mentioned: 8 Post(s) Tagged: 2 Thread(s)	Good luck with a lightened flywheel...

03-13-2017, 12:43 AM	#6
radroach Senior Member Join Date: Feb 2013 Drives: car Location: usa Posts: 2,162 Thanks: 1,028 Thanked 867 Times in 530 Posts Mentioned: 35 Post(s) Tagged: 1 Thread(s)	Well the engine can't just respond in the manner you're asking it. Your opening and closing the throttle shut at low rpms so the engine is trying to breathe and adjust to what you're doing. I think first there has to be some time for pre-enrichment otherwise it'll just be sucking air. When I rev I do it easily first, and then just breathe into the throttle. I don't tap.

03-13-2017, 12:45 AM	#7
radroach Senior Member Join Date: Feb 2013 Drives: car Location: usa Posts: 2,162 Thanks: 1,028 Thanked 867 Times in 530 Posts Mentioned: 35 Post(s) Tagged: 1 Thread(s)	Then again I could be totally wrong. It's kinda hard to tell what's wrong without seeing what your feet are doing.

03-13-2017, 01:09 AM	#9
radroach Senior Member Join Date: Feb 2013 Drives: car Location: usa Posts: 2,162 Thanks: 1,028 Thanked 867 Times in 530 Posts Mentioned: 35 Post(s) Tagged: 1 Thread(s)	@G17BRZ the throttle response should become more refined through normal and spririted driving. If your car is brand new or the battery disconnected recently then the car takes time to re-learn, and can be laggy in the duration.

03-13-2017, 07:08 AM	#12
guybo Huge E85 fan! Join Date: May 2016 Drives: 2016 Scion FRS Location: Tampa, FL, USA Posts: 1,850 Thanks: 539 Thanked 1,010 Times in 605 Posts Mentioned: 32 Post(s) Tagged: 0 Thread(s)	So the complaint is that when you let up on on the gas, the revs drop? Am i missing something?

03-13-2017, 08:05 PM	#14
Oxyg3n Senior Member Join Date: Oct 2015 Drives: 2017 BRZ - WRB Location: Bay Area Posts: 323 Thanks: 115 Thanked 209 Times in 109 Posts Mentioned: 2 Post(s) Tagged: 1 Thread(s)	@G17BRZ I believe that is normal. I had the same question when I first got the car but no others seem to understand what I was getting at. I haven't experienced other cars doing this either, this is a first(I know the pre-2017 didn't dip in rpm before it revs) Sent from my SAMSUNG-SM-G920A using Tapatalk

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