5sfe performance mods Options

[ncampb]

I have a piggy back ECU installed that makes my Celica "flexfuel". It runs way better on E85 than pump gas.

This mod is great because it increases performance and saves me a bunch of money on fuel. E85 ethanol pumps are going up everywhere, and if you have one near you, I would consider this upgrade a necessity.

E85 is 105 octane. Thats why it will increase performance, even on a 5sfe with no mods. The owners manual "recommends" 91 octane so you know that higher octane is going to increase performance. The easiest way to increase performance is to increase fuel quality, and this mod will save you money at the same time.

[Bitter]

oh boy....

your gt takes 87 PON octane, also called 91 RON octane. its a bit of an oversight in the manuals, my geo prizm has the same typo in its owners manual.


your fuel system is not made to cope with such high ethanol concentrations. over longer periods of time the higher ethanol will swell and rot rubbers in the sytem. nitrile is used in flex fuel vehicles.

the 'special box' simply tricks the PCM to inject more fuel by altering some sensor inputs. probably has it running on the rich side, even for E85.


if it is true that your car runs soo much better on E85, then its likely you have carbon deposits on your pistons or your head. the high octane of the E85 is a bandaid, cleaning the deposits out would be the correct thing to do.


i could go on and on...

your 5S-FE with its 10* btdc timing and 9.5:1 cr and no VVT is not anywhere needing the high knock resistance of E85.