Looking at buying a car that is tuned on e85. My question is how would I go about getting to back to pump gas. Would I need to get new fuel components? Or just a new tune? Been trying to find info on it and can't find much. Haven't touched a honda in a little over ten years so not to up-to-date on all this any help is appreciated.

 

You will need a flex fuel sensor installed in the car and an engine management system that uses this sensor to alter the tune based on the level of ethanol content in the fuel being run. Then, you must be sure that the tune is ideal for both pump gas (E10) and E85. Then you can switch back and forth or mix these two fuels and operate the vehicle safely.

 

So I'm assuming I can get flex fuel sensor and just have the s300 re tuned by a good shop and I'd be good to go?

 

Yessir... get a flex fuel sensor installed and wired up to the ECU and then go and get a re-tune.

 

thank you for your help it's appreciated 🤛

 

You dont need a flex fuel sensor if you don't plan on running 2 diff kinds of fuel. If you just want a 93 tune, skip the content sensor. Just tune it. Its all good

 

Worth noting that if it's not already tuned with a flexfuel sensor that you'll need a pretty full re-tune. The s300 does alright at compensating from high gas blends to high ethanol blends but can't go the other way effectively. I've tried, it wasn't worth the effort.

If it's strictly a track car, singIe fuel tuning is just fine. I find the flexfuel tune to be really useful for a street car, though. You can pump E85 when you want to get rowdy, or pump E10 if you want to go on a road trip and need the extra mileage. If it's dead summer, hot AF out, and the engine is tending toward knock a little, you can pump a few gallons of E85 in, top off with gas, and let the blending take care of business. You also aren't stuck trying to find a specific gas station when you're out on the road, you can mostly pump in whatever is available. Worth the investment in time for sure.