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PantsDants · 10-31-2014, 05:15 PM

Have any of you tried tweaking the OFT ESC tune to accommodate a header other than the OFH? I recently switched to a catted P&L EL header, and I immediately noticed a ton of knock correction (~-4 degrees) in the 3000-3600 rpm, 0.6-0.7 g/rev range. I've since improved the situation by changing my intake cam phasing to match the Stg 2 EL map in these cells, but I'm still intermittently getting around -1.4 degrees in knock correction. I've tried retarding base timing by up to 1 degree in conjunction with these changes but it doesn't seem to have an effect in reducing it. AFR isn't doing anything wacky and my fuel trims are within 5%.

So I'm wondering if I need to further fine tune the AVCS, or further reduce base timing, or adjust something else entirely. Maybe add more fuel in this range? Are there any general rules of thumb when tuning for a catted header versus uncatted on this car? Any ideas appreciated, thanks!

10-31-2014, 05:15 PM	#7817
PantsDants Senior Member Join Date: Jul 2013 Drives: Scion FR-S A/T, Whiteout Location: Seattle Posts: 334 Thanks: 57 Thanked 221 Times in 90 Posts Mentioned: 16 Post(s)	Tune tweaks for EL catted header? Have any of you tried tweaking the OFT ESC tune to accommodate a header other than the OFH? I recently switched to a catted P&L EL header, and I immediately noticed a ton of knock correction (~-4 degrees) in the 3000-3600 rpm, 0.6-0.7 g/rev range. I've since improved the situation by changing my intake cam phasing to match the Stg 2 EL map in these cells, but I'm still intermittently getting around -1.4 degrees in knock correction. I've tried retarding base timing by up to 1 degree in conjunction with these changes but it doesn't seem to have an effect in reducing it. AFR isn't doing anything wacky and my fuel trims are within 5%. So I'm wondering if I need to further fine tune the AVCS, or further reduce base timing, or adjust something else entirely. Maybe add more fuel in this range? Are there any general rules of thumb when tuning for a catted header versus uncatted on this car? Any ideas appreciated, thanks!