Resetting the ECU after running 87 gas - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

orangespark · 08-27-2015, 05:12 PM

I recently just got an FRS. I didn't realize that it was only supposed to be premium only

. I filled up with 87 octane for the first 1200km until I realized I needed at least 91. I put octane booster and a bit of 94 for this cycle of gas.
I was just wondering if that might have caused any damage to the motor. I can't sleep on it. I hit 5,000 rpm only a couple of times.
Also, should I reset the ECU now? I read somewhere that the ECU learns the most in the first 100 miles.

raven1231 · 08-27-2015, 05:15 PM

No and no. Just use premium for now on.

orangespark · 08-27-2015, 05:35 PM

Thanks for the reply. I can now rest in peace

Packofcrows · 08-27-2015, 11:43 PM

I dont think damage would be there unless you treat it like a race car on cheap gas. My colleague drives a Mercedes and that sonofa puts the cheapest gas over premium. Has for past 6 years. He did have a head gasket leak 2yrs ago but fixed it himself. Thing is always running on one wheel of how abusive he drives it. 218k miles. He's put 175k.

Maybe the Mercedes engine is tank proof? It's like a c230 or c2 something. I've read his manual. Premium only.

NyC Zn6 · 08-28-2015, 04:29 PM

no you should be fine as the ecu pulls timing to compensate for the 87 and will relearn when 93 is used.

Sportsguy83 · 08-28-2015, 06:58 PM

FRS/BRS vs.... 87 Octane gas?

ls1ac · 08-28-2015, 08:43 PM

Look on the bright side, you are now going to get a power improvement.

rookie · 08-28-2015, 08:58 PM

Could've been worse...

Jaylyons1 · 08-29-2015, 12:48 PM

Quote:

Originally Posted by rookie

Could've been worse...

At least it wasn't diesel!

Ultramaroon · 08-29-2015, 03:01 PM

It's true, though. ECUs are like children. Sometimes they throw a tantrum and need a time-out.

rookie · 08-29-2015, 04:23 PM

Quote:

Originally Posted by Jaylyons1

At least it wasn't diesel!

Yup.

08-27-2015, 05:12 PM	#1
orangespark Member Join Date: Aug 2015 Drives: White Frs AT Location: Toronto Posts: 66 Thanks: 38 Thanked 13 Times in 13 Posts Mentioned: 1 Post(s) Tagged: 1 Thread(s)	Resetting the ECU after running 87 gas I recently just got an FRS. I didn't realize that it was only supposed to be premium only . I filled up with 87 octane for the first 1200km until I realized I needed at least 91. I put octane booster and a bit of 94 for this cycle of gas. I was just wondering if that might have caused any damage to the motor. I can't sleep on it. I hit 5,000 rpm only a couple of times. Also, should I reset the ECU now? I read somewhere that the ECU learns the most in the first 100 miles.

08-27-2015, 05:15 PM	#2
raven1231 Senior Member Join Date: Aug 2013 Drives: 2013 Firestorm FR-S, 2016 DGM WRX Location: Cincinnati, Ohio Posts: 4,580 Thanks: 8,264 Thanked 3,118 Times in 1,667 Posts Mentioned: 24 Post(s) Tagged: 1 Thread(s)	No and no. Just use premium for now on. __________________ http://www.ft86club.com/forums/showthread.php?t=59870

08-27-2015, 11:43 PM	#4
Packofcrows hey you, yeah you <3 Join Date: Jul 2012 Drives: 2014 37J FR-S Location: Monterey County, CA Posts: 2,713 Thanks: 905 Thanked 1,258 Times in 809 Posts Mentioned: 38 Post(s) Tagged: 3 Thread(s)	I dont think damage would be there unless you treat it like a race car on cheap gas. My colleague drives a Mercedes and that sonofa puts the cheapest gas over premium. Has for past 6 years. He did have a head gasket leak 2yrs ago but fixed it himself. Thing is always running on one wheel of how abusive he drives it. 218k miles. He's put 175k. Maybe the Mercedes engine is tank proof? It's like a c230 or c2 something. I've read his manual. Premium only. __________________ Got my TRD wheels and TRD louvers. Thanks!!!

08-29-2015, 03:01 PM	#10
Ultramaroon chicken tonight Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,946 Thanks: 52,302 Thanked 36,617 Times in 18,980 Posts Mentioned: 1109 Post(s) Tagged: 9 Thread(s)	It's true, though. ECUs are like children. Sometimes they throw a tantrum and need a time-out. __________________ service manuals

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08-27-2015, 05:35 PM	#3
orangespark Member Join Date: Aug 2015 Drives: White Frs AT Location: Toronto Posts: 66 Thanks: 38 Thanked 13 Times in 13 Posts Mentioned: 1 Post(s) Tagged: 1 Thread(s)	Thanks for the reply. I can now rest in peace

08-28-2015, 04:29 PM	#5
NyC Zn6 Senior Member Join Date: Apr 2013 Drives: 10 Series #974 6m/t Location: NYC Posts: 1,956 Thanks: 1,357 Thanked 1,141 Times in 669 Posts Mentioned: 6 Post(s) Tagged: 2 Thread(s)	no you should be fine as the ecu pulls timing to compensate for the 87 and will relearn when 93 is used.

08-28-2015, 08:58 PM	#8
rookie Senior Member Join Date: Jul 2015 Drives: 1991 Formula Red NSX Location: Wisconsin Posts: 483 Thanks: 271 Thanked 430 Times in 209 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Could've been worse...

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