Tuned cold start and oil dilution - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

softail · 03-22-2023, 04:58 PM

I'm on E85 through OFT and Wayne's ROM. It is accepted that cold start (high rpm, valve timing, ignition retard) is mainly used to warm cats.

To our tunes we take them off because we don't have any more cats and we don't want to wake up our neighbors.

I read in CAR TROTTLE, that the ECU increases engine speed at initial idle to also ensure that all excess fuel is expelled from the cylinders faster than normal.

The dilution of the fuel in the oil takes place during the starting phases. I wonder, and especially for those who are at E85, if it is really relevant to remove the cold start procedure?

Sorry if this topic has been covered before but I couldn't find any real answers.

DarkPira7e · 03-22-2023, 05:21 PM

Removing cold start is just to keep noise down. I have mine still

tomm.brz · 03-22-2023, 09:05 PM

cold start in HARD CODED
it means you never get rid of it, you just tame it

still the car will do a stratified injection with very late DI injection and retarded timings

Don t worry about it, nothing bad will happen also with e85..

03-22-2023, 04:58 PM	#1
softail Junior Member Join Date: Mar 2023 Drives: GT86 2013 E85 Location: France Posts: 7 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Tuned cold start and oil dilution I'm on E85 through OFT and Wayne's ROM. It is accepted that cold start (high rpm, valve timing, ignition retard) is mainly used to warm cats. To our tunes we take them off because we don't have any more cats and we don't want to wake up our neighbors. I read in CAR TROTTLE, that the ECU increases engine speed at initial idle to also ensure that all excess fuel is expelled from the cylinders faster than normal. The dilution of the fuel in the oil takes place during the starting phases. I wonder, and especially for those who are at E85, if it is really relevant to remove the cold start procedure? Sorry if this topic has been covered before but I couldn't find any real answers.

03-22-2023, 05:21 PM	#2
DarkPira7e Rust bucket enthusiast Join Date: Feb 2017 Drives: 2013 Turbo Firestorm FRS Location: Vermont Posts: 3,949 Thanks: 3,210 Thanked 4,102 Times in 2,050 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	Removing cold start is just to keep noise down. I have mine still __________________ Turbo FR-S Build - Build Thread JDL EL Recirc manifold, Boostlab BL58x Turbo w/ T51R, 17x9 ARC-8, IAG block

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03-22-2023, 09:05 PM	#3
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,207 Thanks: 502 Thanked 1,070 Times in 778 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	cold start in HARD CODED it means you never get rid of it, you just tame it still the car will do a stratified injection with very late DI injection and retarded timings Don t worry about it, nothing bad will happen also with e85..

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