Very aggressive engine braking all of a sudden - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Yeel · 06-15-2022, 12:13 PM

Yesterday, out of nowhere i noticed that my car has way more aggressive engine braking. Its very noticeable that as soon as you lift the throttle it slows down alot, before you could pretty much coast in gear with no gas and it would only decrease a tiny bit.

Even downhill, in gear with no gas it slows down unless the hill is very steep. Something feels wrong.

I thought first that the brakes might be dragging on? I drove the car for 2 hours on the highway, stopped and put my hand around the wheels and there were no heat at all from any corner, so i dont think the brakes are dragging. The other part i would think would be an issue is the tune? But that has been the same for over a year so i dont see how that could be the issue.

Next time im out i'll try and let it coast downhill not in gear, and i should be able to tell if its any brakes on. But i dont think this is the issue as mentioned above.

Lantanafrs2 · 06-15-2022, 12:16 PM

Auto I assume?

blatantanomaly · 06-15-2022, 12:23 PM

The new engine braking behavior you're describing sounds more correct than the older description.

My total guess is that your throttle plate wasn't closing all the way before but now it is. My engine braking is strong enough that if I don't use it, I won't be able to slow down enough to make corners at the track even with upgraded pads. The only modification that might add power to my engine is a K&N filter.

Are you able to collect any data through an OBD-II dongle or something?

Addendum: Reading the reply above made me realize that I assumed your car is manual.

bcj · 06-15-2022, 10:43 PM

Is the air filter old or possibly got water into it recently?
Has Iceland been popping off again :/

Lantanafrs2 · 06-18-2022, 09:32 PM

Did you move the floor mat?

humfrz · 06-20-2022, 03:06 PM

Quote:

Originally Posted by Lantanafrs2

Did you move the floor mat?

bcj · 06-21-2022, 02:36 AM

Guess he hasn't been back.

JD001 · 06-21-2022, 03:12 AM

Have you checked/changed your cars fluids?

06-15-2022, 12:13 PM	#1
Yeel Junior Member Join Date: Aug 2019 Drives: BRZ Location: Norway Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Very aggressive engine braking all of a sudden Yesterday, out of nowhere i noticed that my car has way more aggressive engine braking. Its very noticeable that as soon as you lift the throttle it slows down alot, before you could pretty much coast in gear with no gas and it would only decrease a tiny bit. Even downhill, in gear with no gas it slows down unless the hill is very steep. Something feels wrong. I thought first that the brakes might be dragging on? I drove the car for 2 hours on the highway, stopped and put my hand around the wheels and there were no heat at all from any corner, so i dont think the brakes are dragging. The other part i would think would be an issue is the tune? But that has been the same for over a year so i dont see how that could be the issue. Next time im out i'll try and let it coast downhill not in gear, and i should be able to tell if its any brakes on. But i dont think this is the issue as mentioned above.

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06-15-2022, 12:16 PM	#2
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,517 Thanks: 2,520 Thanked 3,088 Times in 1,654 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Auto I assume?

06-15-2022, 12:23 PM	#3
blatantanomaly Member Join Date: Dec 2017 Drives: 2016 BRZ Limited Location: SWFL Posts: 22 Thanks: 12 Thanked 6 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	The new engine braking behavior you're describing sounds more correct than the older description. My total guess is that your throttle plate wasn't closing all the way before but now it is. My engine braking is strong enough that if I don't use it, I won't be able to slow down enough to make corners at the track even with upgraded pads. The only modification that might add power to my engine is a K&N filter. Are you able to collect any data through an OBD-II dongle or something? Addendum: Reading the reply above made me realize that I assumed your car is manual.

06-18-2022, 09:32 PM	#5
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,517 Thanks: 2,520 Thanked 3,088 Times in 1,654 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Did you move the floor mat?

06-21-2022, 03:12 AM	#8
JD001 Senior Member Join Date: Apr 2015 Drives: Subaru BRZ Location: UK Posts: 6,028 Thanks: 7,652 Thanked 6,187 Times in 3,474 Posts Mentioned: 25 Post(s) Tagged: 2 Thread(s)	Have you checked/changed your cars fluids?

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