OFT Stg 2 E85 MAF question - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Mr_Eyo · 10-30-2018, 01:44 AM

I got curious and compared the OTS Stg 1 to the Stg 2 E85 ROM and saw that the Stg 2 E85 MAF scale is richer from 3.2V up. Why would OL enrichment be handled in the MAF here rather than in the POL table?

tomm.brz · 10-30-2018, 02:09 AM

usually aftermarket headers cause afr to go leaner compared to a stock header

steve99 · 10-30-2018, 06:31 AM

In principal the maf scales should be same regardless of e85 petrol or type of header. As the maf is just measuring air flow into engine. Maf should only change if intake changes

I suspect the oft guys may artificially add to the open loop part of scale in some tunes to ensure they always run on the rich side, this is safer than lean as its a one tune for all

If your runnig richer than commanded afr then coreect that with maf scale

Mr_Eyo · 10-30-2018, 11:41 PM

Thanks for the responses guys. It's just puzzling; the OTS Stg 2 and Stg 2+ petrol tunes don't have this MAF enrichment. I thought with E85 you can go a little leaner due to the higher octane rating.

steve99 · 10-31-2018, 04:13 AM

Quote:

Originally Posted by Mr_Eyo

Thanks for the responses guys. It's just puzzling; the OTS Stg 2 and Stg 2+ petrol tunes don't have this MAF enrichment. I thought with E85 you can go a little leaner due to the higher octane rating.

Fueling increase is not done by maf its done in inkectpr scaling and di pressure target tables

10-30-2018, 01:44 AM	#1
Mr_Eyo Senior Member Join Date: Jul 2018 Drives: 2017 Toyota 86 Location: CA, USA Posts: 231 Thanks: 21 Thanked 33 Times in 29 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	OFT Stg 2 E85 MAF question I got curious and compared the OTS Stg 1 to the Stg 2 E85 ROM and saw that the Stg 2 E85 MAF scale is richer from 3.2V up. Why would OL enrichment be handled in the MAF here rather than in the POL table?

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10-30-2018, 02:09 AM	#2
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,196 Thanks: 500 Thanked 1,067 Times in 775 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	usually aftermarket headers cause afr to go leaner compared to a stock header

10-30-2018, 06:31 AM	#3
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,998 Thanks: 1,035 Thanked 4,987 Times in 2,981 Posts Mentioned: 598 Post(s) Tagged: 2 Thread(s)	In principal the maf scales should be same regardless of e85 petrol or type of header. As the maf is just measuring air flow into engine. Maf should only change if intake changes I suspect the oft guys may artificially add to the open loop part of scale in some tunes to ensure they always run on the rich side, this is safer than lean as its a one tune for all If your runnig richer than commanded afr then coreect that with maf scale

10-30-2018, 11:41 PM	#4
Mr_Eyo Senior Member Join Date: Jul 2018 Drives: 2017 Toyota 86 Location: CA, USA Posts: 231 Thanks: 21 Thanked 33 Times in 29 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Thanks for the responses guys. It's just puzzling; the OTS Stg 2 and Stg 2+ petrol tunes don't have this MAF enrichment. I thought with E85 you can go a little leaner due to the higher octane rating.

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