Engine Mods and CELs - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Captain Snooze · 04-08-2013, 10:41 PM

I am adding engine mods one at a time. I have installed a Perrin intake. Next will be cat-back. Then over and down pipe and then possibly headers. Am I correct in saying that I will get a CEL when the ECU is no longer able to make the necessary adjustments for the modifications? I am not referring to extracting the most power with a tune. I am wondering at what point does a tune become a necessity.

Ta.

swift996 · 04-08-2013, 10:50 PM

I've only seen CELs in two scenarios:

1 - Intake is messing with the MAF signal enough to throw it off
2 - A header without a primary cat can throw off the O2 reading. A lot of guys have run spacers/washers to get rid of the problem. If you get a header with a primary cat, it shouldn't be an issue.

SmsAlSuwaidi · 04-08-2013, 11:13 PM

Quote:

Originally Posted by swift996

I've only seen CELs in two scenarios:

1 - Intake is messing with the MAF signal enough to throw it off
2 - A header without a primary cat can throw off the O2 reading. A lot of guys have run spacers/washers to get rid of the problem. If you get a header with a primary cat, it shouldn't be an issue.

+ some headers manufactures are coming up with other ways to extend the sensors or block it, but considering you'll run a header and all other supporting mods i bet u'd be in need of a tune which when you do you could remove the CEL code

04-08-2013, 10:41 PM	#1
Captain Snooze Because compromise ® Join Date: Jan 2012 Drives: Red Herring Location: australia Posts: 7,817 Thanks: 4,047 Thanked 9,548 Times in 4,194 Posts Mentioned: 60 Post(s) Tagged: 0 Thread(s)	Engine Mods and CELs I am adding engine mods one at a time. I have installed a Perrin intake. Next will be cat-back. Then over and down pipe and then possibly headers. Am I correct in saying that I will get a CEL when the ECU is no longer able to make the necessary adjustments for the modifications? I am not referring to extracting the most power with a tune. I am wondering at what point does a tune become a necessity. Ta.

04-08-2013, 10:50 PM	#2
swift996 Senior Member Join Date: Nov 2011 Drives: Subaru BRZ Limited 6MT Location: Winston-Salem, NC Posts: 2,432 Thanks: 712 Thanked 955 Times in 545 Posts Mentioned: 47 Post(s) Tagged: 0 Thread(s)	I've only seen CELs in two scenarios: 1 - Intake is messing with the MAF signal enough to throw it off 2 - A header without a primary cat can throw off the O2 reading. A lot of guys have run spacers/washers to get rid of the problem. If you get a header with a primary cat, it shouldn't be an issue. __________________ Innovate Supercharged Black Limited BRZ 6-Speed MT(Build Thread) 2010 Cadillac CTS-V Sedan M6 w/550whp (Build Thread)

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