Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Leaning out around 4200-4500 RPM?

SprungtS · 10-24-2020, 04:16 AM

Thank you both for the responses, I just now saw this. Definitely gives me a good starting point from here.

@Kodename47 - I'm running the OFT values for PI/DI ratios, nothing changes above 2400 RPM at full load. That was something I thought of because I thought I'd seen people with that kind of problem before. Load limits are as follows, and I thought sufficient, but who knows - I may not understand the table correctly (Also honestly not sure if I copied these from somewhere, or if I just increased them across the board for boost):
800 1000 1200 2000 2200 2400 2500 3000 3200
1.2 1.4 1.6 2.0 2.2 2.4 2.6 3.0 3.2

@steve99 - Thank you, thank you, thank you for suggesting logging pulsewidths. I thought of the possibility of valve overlap causing it, but I couldn't fathom a way to test for that. I'm guessing that depending upon sensor outputs, cam timing is adjusted such that on one pull I could have more overlap than another?
Also, is DI max delivery the same as "DI Quantity Maximum"? Currently has a value of .9 up through 4800 RPM and then .75 from 5200-6400, and .82 from 6800 up.

Thank you both again for the help!

10-24-2020, 04:16 AM	#7
SprungtS Member Join Date: Oct 2020 Drives: 2020 BRZ tS, 2014 FR-S Monogram Location: Eastern NC Posts: 27 Thanks: 3 Thanked 9 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thank you both for the responses, I just now saw this. Definitely gives me a good starting point from here. @Kodename47 - I'm running the OFT values for PI/DI ratios, nothing changes above 2400 RPM at full load. That was something I thought of because I thought I'd seen people with that kind of problem before. Load limits are as follows, and I thought sufficient, but who knows - I may not understand the table correctly (Also honestly not sure if I copied these from somewhere, or if I just increased them across the board for boost): 800 1000 1200 2000 2200 2400 2500 3000 3200 1.2 1.4 1.6 2.0 2.2 2.4 2.6 3.0 3.2 @steve99 - Thank you, thank you, thank you for suggesting logging pulsewidths. I thought of the possibility of valve overlap causing it, but I couldn't fathom a way to test for that. I'm guessing that depending upon sensor outputs, cam timing is adjusted such that on one pull I could have more overlap than another? Also, is DI max delivery the same as "DI Quantity Maximum"? Currently has a value of .9 up through 4800 RPM and then .75 from 5200-6400, and .82 from 6800 up. Thank you both again for the help!