|
Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
|
Thread Tools | Search this Thread |
10-10-2019, 09:50 AM | #1 |
Junior Member
Join Date: Jun 2019
Drives: Subaru BRZ 2015
Location: Finland
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Engine issue: stock 2015 BRZ power dip @ 6100 RPM
Summary
Stock 2015 BRZ with 71k miles loses power at roughly 6100 RPM and peaks at 125 whp. Mechanic suspected detonation with ECU cutting power, alternative insights appreciated. Details I took my stock 2015 BRZ to a baseline dyno before starting to do any upgrades on it. The car was pre-owned (single owner) and had about 65k miles on it. Leasing car, don't know much about previous owner. Regular service done by dealership, had them change spark plugs a month ago. Spirited driving on my part, all on European 98 octane, the previous owner might have used 95 or 98. The dyno graph shows a clear cutting of power at roughly 6100 rpm. The same dip happened in all pulls but with +-200 rpm. The peak power also comes out at just 125 whp which seems a tad low. Dyno was Rototest. The mechanic suspected detonation and the ECU cutting off power to protect the engine given how harsh the drop was. He sold me fuel line cleaner and engine cleaner (to be mixed with oil) which seemed like a good first step. He also suggested E85, which I'm planning to do later, but I'd like to see if I can fix this on 98 octane first. Opinions and ideas on how to fix it? |
10-10-2019, 09:53 AM | #2 |
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)
|
It ain't liking something. Cats still in one piece?
|
10-10-2019, 10:53 AM | #3 |
Senior Member
Join Date: Oct 2013
Drives: 2019 BMW ///M4
Location: Los Angeles, CA
Posts: 2,332
Thanks: 102
Thanked 1,167 Times in 714 Posts
Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
|
I don't see how E85 can "fix" this. Sounds like it has some issue with the AVCS. Maybe the solenoid has gone bad? Toyota Part # is SU00300096.
|
The Following 2 Users Say Thank You to N1rve For This Useful Post: | Lantanafrs2 (10-10-2019), NoHaveMSG (10-10-2019) |
10-10-2019, 06:08 PM | #4 |
Senior Member
Join Date: Oct 2012
Drives: UK GT86
Location: UK
Posts: 3,040
Thanks: 185
Thanked 1,629 Times in 1,112 Posts
Mentioned: 155 Post(s)
Tagged: 1 Thread(s)
|
Datalogs would really help
__________________
.: Stealth 86 :.
Abbey Motorsport/K47 Tuned Sprintex 210 Supercharger Kodename 47 DJ: Soundcloud / Instagram / Facebook |
10-10-2019, 06:20 PM | #5 |
Senior Member
Join Date: Jan 2018
Drives: 2017 toyota 86
Location: PNW
Posts: 2,131
Thanks: 336
Thanked 1,188 Times in 781 Posts
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
|
Do you feel the dip when doing WOT pulls? A drop like that should be fairly noticeable.
The overall WHP number looks low but at the end of the day its just a number. Do you have any acceleration numbers to compare? If your doing 0-60 in under 7sec and don’t noticeably feel a loss of power/hesitation at 6k it could all be fine. A data-log would make things 10times easier to diagnose if/what the issue is. The best place to start would be to clean the maf, and double check all hoses, clamps, fittings etc.. for any vacuum leaks, and check for exhaust leaks. Also no CEL? |
10-11-2019, 06:35 AM | #6 |
Junior Member
Join Date: Jun 2019
Drives: Subaru BRZ 2015
Location: Finland
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
This sounds like a reasonable next step.
I'm new to the platform, what would be the highest quality logger for the BRZ given I'm fine for having a laptop in the car? Does the OEM Techstream app/cable suffice or does one of the tuning devices like EcuTEK offer better resolution/data? |
10-11-2019, 06:38 AM | #7 | |
Junior Member
Join Date: Jun 2019
Drives: Subaru BRZ 2015
Location: Finland
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Quote:
No CEL. |
|
10-11-2019, 07:32 AM | #8 | |
Rust bucket enthusiast
Join Date: Feb 2017
Drives: 2013 Turbo Firestorm FRS
Location: Vermont
Posts: 3,933
Thanks: 3,200
Thanked 4,095 Times in 2,045 Posts
Mentioned: 31 Post(s)
Tagged: 0 Thread(s)
|
Quote:
For tuning N/A, I would recommend the openflash tablet. If you're dead set on using a laptop, a Tactrix cable and Romraider/BRZedit would suffice. I think a one time use BRZedit personal license is only $50 bucks and it works well enough. I still recommend openflash tablet for ease of use and the availability of support using it. |
|
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Power steering issue with slicks? | owenxguo | Tracking / Autocross / HPDE / Drifting | 59 | 02-06-2024 11:05 AM |
Engine issue? Please HELP | Silver_Arrow | Issues | Warranty | Recalls / TSB | 21 | 06-10-2018 10:52 PM |
Worldwide Power Steering Issue Safety Recall | nzer | Issues | Warranty | Recalls / TSB | 27 | 08-08-2016 06:14 AM |
DRL Issue on Used 2015 FR-S | ThisGuyRett | Issues | Warranty | Recalls / TSB | 19 | 07-20-2016 11:02 PM |
Stock Engine / Drivetrain Power Limits | lokiwho | Engine, Exhaust, Transmission | 13 | 12-18-2015 12:22 AM |