Is engine knock normal for the FA20? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Cal3000 · 05-17-2013, 10:19 PM

I logged some data while driving home. I have a tune. Apparently knock correction is occurring 5-8 time every 5 minutes while cruising. Is that normal? Doesn't seem good. I'm on 91 octane.

Allch Chcar · 05-17-2013, 10:44 PM

According to the manual, some is normal on 91 octane. Serious knocking would be audible (with the windows down).

Cal3000 · 05-17-2013, 11:01 PM

Audible would be knock corrections under -3 degrees if I remember.

AVOturboworld · 05-17-2013, 11:07 PM

That's 91 octane for you.

Cal3000 · 05-18-2013, 12:21 AM

I'll probably put the stock map back on tomorrow and see how that looks. As long as there is no engine damage, I'm ok with a little knock

StormTrooper · 05-18-2013, 12:18 PM

why can't we have decent gas in this country???

Mobius357 · 05-18-2013, 04:55 PM

My car seems to run well on the 93 we have here. Use to have 94 too, but I haven't seen that for a while.

Tim_Asphalt_FRS · 05-18-2013, 06:57 PM

Quote:

Originally Posted by StormTrooper

why can't we have decent gas in this country???

Politicians.

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Visconti · 05-18-2013, 07:02 PM

Depends when it happens.. WOT old be a problem , but normal driving isn't such a big deal...these ecus have a advanced knock control system and normally can deal with this stuff pretty well
john

Cal3000 · 05-18-2013, 08:08 PM

Quote:

Originally Posted by Visconti

Depends when it happens.. WOT old be a problem , but normal driving isn't such a big deal...these ecus have a advanced knock control system and normally can deal with this stuff pretty well
john

Thanks for letting me know this.
I slapped back on the stock map and still knocking. ECU resets itself after flashing right? All these graphs are from Shell 91 octane.

arghx7 · 05-19-2013, 11:32 AM

You'd be surprised how many new engines run like this. It's not just an FA20 thing. It's to maximize gas mileage and sense the octane level.

A5D5TRYR · 05-19-2013, 12:12 PM

Yeah, I think it's the same reason the new direct injection high compression V6's in the new pony cars can run regular. Same with the Genesis 2.0T and I think the new Focus ST can run regular as well even though it's turboed.

Allch Chcar · 05-19-2013, 02:56 PM

Quote:

Originally Posted by StormTrooper

why can't we have decent gas in this country???

Premium unleaded is a tiny fraction of Gasoline use because it's significantly more expensive. Things have changed in the last 10 years, can you guess why?

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http://www.eia.gov/todayinenergy/detail.cfm?id=11131

Dynotronics1 · 05-20-2013, 07:33 AM

Quote:

Originally Posted by Cal3000

I logged some data while driving home. I have a tune. Apparently knock correction is occurring 5-8 time every 5 minutes while cruising. Is that normal? Doesn't seem good. I'm on 91 octane.

If it the calibration is set perfectly for your car and your fuel, then no they should be no KR. A 1.0 pull every once in a while on a 1 AM is fine, and will not cause any issues, but what your displaying looks like it needs a bit more work. I'm sure your tuner will finish it up, assuming you are sending logs

05-17-2013, 10:19 PM	#1
Cal3000 Senior Member Join Date: Dec 2012 Drives: Panda FR-S Location: Corona, California Posts: 531 Thanks: 297 Thanked 377 Times in 161 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Is engine knock normal for the FA20? I logged some data while driving home. I have a tune. Apparently knock correction is occurring 5-8 time every 5 minutes while cruising. Is that normal? Doesn't seem good. I'm on 91 octane. Attached Images

05-19-2013, 12:12 PM	#12
A5D5TRYR Senior Member Join Date: Nov 2012 Drives: FR-S 6MT Ultramarine (BeeDrill) Location: London, Canada Posts: 238 Thanks: 104 Thanked 56 Times in 38 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Yeah, I think it's the same reason the new direct injection high compression V6's in the new pony cars can run regular. Same with the Genesis 2.0T and I think the new Focus ST can run regular as well even though it's turboed. __________________ 2013 Scion FR-S - Ultramarine 6MT

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05-17-2013, 11:01 PM	#3
Cal3000 Senior Member Join Date: Dec 2012 Drives: Panda FR-S Location: Corona, California Posts: 531 Thanks: 297 Thanked 377 Times in 161 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Audible would be knock corrections under -3 degrees if I remember.

05-17-2013, 11:07 PM	#4
AVOturboworld Join Date: Jan 2012 Drives: 2013 "AVO Orange" FR-S Location: Seattle, WA Posts: 1,067 Thanks: 69 Thanked 2,277 Times in 636 Posts Mentioned: 108 Post(s) Tagged: 2 Thread(s)	That's 91 octane for you.

05-18-2013, 12:21 AM	#5
Cal3000 Senior Member Join Date: Dec 2012 Drives: Panda FR-S Location: Corona, California Posts: 531 Thanks: 297 Thanked 377 Times in 161 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	I'll probably put the stock map back on tomorrow and see how that looks. As long as there is no engine damage, I'm ok with a little knock

05-18-2013, 04:55 PM	#7
Mobius357 Senior Member Join Date: Sep 2012 Drives: '15 WRX '13 Legacy '07 Colorado Location: Seacoast NH Posts: 337 Thanks: 10 Thanked 118 Times in 82 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	My car seems to run well on the 93 we have here. Use to have 94 too, but I haven't seen that for a while.

05-18-2013, 07:02 PM	#9
Visconti Banned Join Date: Apr 2012 Drives: 05 STi Location: Norwalk, CT Posts: 2,843 Thanks: 196 Thanked 3,188 Times in 1,197 Posts Mentioned: 375 Post(s) Tagged: 2 Thread(s)	Depends when it happens.. WOT old be a problem , but normal driving isn't such a big deal...these ecus have a advanced knock control system and normally can deal with this stuff pretty well john

05-19-2013, 11:32 AM	#11
arghx7 Senior Member Join Date: Nov 2011 Drives: car Location: cold Posts: 599 Thanks: 72 Thanked 607 Times in 185 Posts Mentioned: 33 Post(s) Tagged: 0 Thread(s)	You'd be surprised how many new engines run like this. It's not just an FA20 thing. It's to maximize gas mileage and sense the octane level.

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