Anyone tried bioethanol on their A/S8?

[SilverS8]

Hi.

Here in Norway we have E85(15% petrol and 85% bioethanol) at the pumps.

Since the price is quite a bit lower and the octane number is somwhere around 112 i have used this both on my earlier Audi RS2 and the Audi S6 i have now.
50/50 of E85 and petrol has done wonders for a Turbocharged Audi and i know several people using pure E85 on their older non-turbo VAG's without any issue.

Fuel consumption of E85 is said to be 30% higher then for regular petrol.(backside)
Not sure if you have this at the pumps in the UK?

Its also perfect for MOT.... Close to no "polution"

[daviesbike]

http://www.bioperformanceuk.com/bioethanol_pumps.php

this web sight shows you where to buy it in the uk, i did look into this as an alternative to LPG seemly my car will run on it with out a convertion kit, if i fill up 50% petrol in the tank and then fill it with E85 and do this sevral times the ECU will self learn and be able to run on it no problem,

but when i looked into it more i thought that i needed different injectors ? but was never sure and never found out in the end would love to know though ?

[ainarssems]

I thought you need around twice as much ethanol for the same amount of air so you need bigger injectors. But I have never looked deeper so I could be wrong.

[SilverS8]

*Live*

I am giving it a go Almost completely empty tank and put in 10 litres 98 octane and 10 litres E85....

Yes she starts... Gotta drive her home and see

Will revert with more info later

[Nollywood]

Originally Posted by SilverS8

*Live*

I am giving it a go Almost completely empty tank and put in 10 litres 98 octane and 10 litres E85....

Yes she starts... Gotta drive her home and see

Will revert with more info later

Looking forward to your views.

[SilverS8]

Nothing much to report actually. Worked like a charm so far. Drove it apx 50 miles yesterday both normal and hard and no difference.

Just went out now to se how it was on startup when cold. And it actually runs a bit smoother on idle then before.(if this is just not my imagination)

Regarding MPG i really cant say anything yet. I'm thinking of topping her of with a full tank with a 50/50 micture tonight just to get a feel for the mpg's.

[SilverS8]

Just topped her of now. 38 liters E85 and 42 liters of 95 Octane

Time will show

[SilverS8]

Hi.

3 days into this experiment now. The car feels just the same as on regular 95/98 Octane. No problems of any kind.

From before i knew that it takes more Bioethanol then Petrol to do the same job. From the DIS i can see a change in fuel consumption. I Have a pretty standard driving route every week and my normal consumption is somwhere from 15.5 to 16.5 L/100km and never higher. Right now its showing 19.2 L/100km so thats def up a bit. But i dont really understand how the DIS find this out.... Does the Ecu understand its on another fueltype and actually forcing in more?

2 be sure i'm going to be looking at the total distance driven when tank is close to empty and then find out if this was in any way saving me money.

If it evens out in the end i think i'm still going to continue using Bioethanol just cause it gives a much cleaner combustion and that cant in no way harm the engine (I Hope)

[ainarssems]

Originally Posted by SilverS8

Hi.

3 days into this experiment now. The car feels just the same as on regular 95/98 Octane. No problems of any kind.

From before i knew that it takes more Bioethanol then Petrol to do the same job. From the DIS i can see a change in fuel consumption. I Have a pretty standard driving route every week and my normal consumption is somwhere from 15.5 to 16.5 L/100km and never higher. Right now its showing 19.2 L/100km so thats def up a bit. But i dont really understand how the DIS find this out.... Does the Ecu understand its on another fueltype and actually forcing in more?

2 be sure i'm going to be looking at the total distance driven when tank is close to empty and then find out if this was in any way saving me money.

If it evens out in the end i think i'm still going to continue using Bioethanol just cause it gives a much cleaner combustion and that cant in no way harm the engine (I Hope)

ECU knows how much fuel it is putting in. As for adjusting ECU monitors lambda and adjusts amount of fuel to give correct lambda values. I was just thinking that with stock injectors adjustment requirement might go out of range. Not sure what happens when ECU goes open loop at WOT, I guess it uses learned values from idle/part throttle if not then it might be running lean at WOT.

[daviesbike]

the injectors will run at 80% load under what it is capable of, there for if the lambda readings are off then it will fuel accordingly to get the result that it is programmed for, so if the E85 burns much cleaner than std petrol then it will fuel accordingly to obtain the readings that it was mapped for at the factory, so on that note yes the ECU must have adapted the fueling to run the E85 if it had not then a fault code would have come up to report a faulty lambda and as it has not reported a fault the lambdas and ecu must there fore be able to adapt to the new fuel,

just make sure you stick to what you are doing dont be tempted to just fill her up on pure E85 it will take time for the ecu to adapt fully hence only a 50/50 mix then progressively move on to 60/40 and 70/30 ect and go no further than 70/30 because your injector duty cycle will have increased to 95% to adapt to the fueling and readings of the lambdas

however you now have your engine running at its best because the 70/30 mix will be as good as race fuel Lol and the car will also compensate by advancing your ignition timing and you will have maximum power that the engine can deliver

its 105 RON and much better for high comp engines and some race engines with 16-1 compression ratio run E85 straight from the pump no extra additives of any kind

the S8 demands a minimum of 95 ron but the claimed 360bhp was made and recorded using 98 and those 3 octain numbers may not sound a great deal but if you had 360bhp on 98 and just started using 95 the car would compensate by retarding the ignition timing so not to cause det in the engine and this can result in a loss or 15 bhp over all so may not sound like a great deal but im sure you would feel the extra ponies so on that basis you may well gain quite a few more using the 105 Ron of the E85 blended at 70/30 you more than likely have 101 or 102 ron fuel in you car right now

any reports of extra power at all ?

_