Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Knock fix with Australian Fuel 98/100 RON

s2d4 · 04-05-2014, 06:56 AM

For what its worth, here are my findings:
1. As @arghx7 said, fuel quality hasn't helped, nor has butchering timing for the low rpm/high load condition for FBKC. I can reproduce it every time but that is driving like an idiot in 4th gear loading up from~1500-3000rpm, so driving normally or at the track won't happen.
2. As @Fizz mentioned, ambient temperature is definitely a factor. Now that temperature has dropped to mid 20s instead of 35-40 degrees celsius, it doesn't happen as often or severe. I've even added all the timing back and it is way better now than butchered timing during hot conditions.
3. With suggestions from @steve99, switching from 98 to 100 has definitely helped with FLKC, only -.35 in a couple of cells and IAM stays solid at 1.
Thanks guys, keep up the good work as we've definitely learnt a lot on this forum.

04-05-2014, 06:56 AM	#73
s2d4 Senior Member Join Date: Mar 2013 Drives: R32 GTR, AW11 MR2 SC, GTS86 R Location: OZ Posts: 2,615 Thanks: 603 Thanked 1,224 Times in 708 Posts Mentioned: 35 Post(s) Tagged: 0 Thread(s)	For what its worth, here are my findings: 1. As @arghx7 said, fuel quality hasn't helped, nor has butchering timing for the low rpm/high load condition for FBKC. I can reproduce it every time but that is driving like an idiot in 4th gear loading up from~1500-3000rpm, so driving normally or at the track won't happen. 2. As @Fizz mentioned, ambient temperature is definitely a factor. Now that temperature has dropped to mid 20s instead of 35-40 degrees celsius, it doesn't happen as often or severe. I've even added all the timing back and it is way better now than butchered timing during hot conditions. 3. With suggestions from @steve99, switching from 98 to 100 has definitely helped with FLKC, only -.35 in a couple of cells and IAM stays solid at 1. Thanks guys, keep up the good work as we've definitely learnt a lot on this forum.