linksamui

Like the title say. Does the 955 957 pretty much the cayennes' line up support E85? I saw some tuner support E85 and with a lot of the station popping up around the city. I'm wondering if we could just fill up our cayenne with E85 and it would be ok to run with it or do we have to do modifications to fully support it. From my search on the injectors it seem they support E85 but not sure about all the other fuelling system.

JohnnyBahamas

I don't know, myself... but I'll bet a dollar that if I needed the answer to this question I would find it in the owner's manual somewhere .

linksamui

looked but will double checked again.

JohnnyBahamas

D'oh! I think I just lost a dollar because I didn't find it in my manual either... but I did learn that methylcyclopentadienyl manganese tricarbonyl may negatively effect emission control system performance, so that's interesting.

About E85 in a Cayenne, I'd say that's a very BAD idea.

That is simply because it is my understanding that all cars that can run E85 are marked FFV for flex fuel vehicle.

linksamui

my was too i was looking to upgrade my injectors and i found out that it support E85 then it got me curious about if it possible to run or not. It would run it on occasion. Maybe for going cruising on weekend.

Jochy

As far I know, if you put some E85 in your engine it will corrode lots in internal parts and the internal seals which are not designed to withstand this fuel spec will not perform. Fuel ratio vs air is also involved, nice topic to talk about in a BBQ with some cold beers here in Houston...

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linksamui

E85 would do that? wow sound horrible.

JAGMAN1

E85 requires the use of specialized o-rings and seals in the fuel system to prevent degradation by the ethanol.

It will also give you 30-50% worse fuel economy. CTT fuel economy is bad enough already.

TozoM8

The fuel pump would die in a day. 76K btu (ethanol) vs 114K btu (gasoline) so around 1.5 gal ethanol =1 gal gasoline

ScorpionT

Anything marked as an FFV means the fuel system is designed for E85 but additionally the ECU must be able to recognize the fuel and compensate for it. Plenty of cars have the hardware to handle E85 but not the software.

Many cars on the road have fuel systems that will work with E85.

The stoich ratio is approx 21% different from gasoline, and fuel economy will vary near the same number. Remember, the cost of E85 is also a fair amount lower which makes up for the price.

It doesnt work like that. The ECU doesnt calculate fuel trims based on thermal energy but on optimized burn ratios (stoichiometric). The engine is designed to run within certain target AFRs at certain RPMs, as specified while initial engine tuning is done. An aftermarket tuner can change these values to whatever works. The nice thing about E85 is that although thermal energy is lower than gasoline, E85 also has a lower tendency to pre-ignite/detonate. This means fuel trims can be leaner while staying safely within cylinder temperature ranges and having a much lower risk of knocking.

Additionally, fuel pumps are controlled by voltage coming from the battery. They dont work harder in response to lean AFRs so they wouldnt fail quicker.

Cole

Compared to what other 500hp 4wd sports car that seats 5 and tows 7700lbs??

Fuel economy is relative

linksamui

nice reply ScorpionT.

I spoke to the garage that do the conversion here. They would have to change all the o-rings the fuel hoses to meet E85 standard, they would also have to find larger injectors to support the injection for E85 since it would need 40-60% more fuel in comparison to normal gasoline injection. E85 equivalent of 105 octane closely to race fuel. I been in mercedes benz that had the conversion done and it ran very well. Although fuel consumption is down about 60% from what you get on a full tank of gasoline/petrol. So if you get 400km to full tank and you'll get 250-280km to full tank. Would have to do more study on this before I make the decision. Where I am E85 is half the cost of gasoline. So it may not be best.

endless_corners

F**K ethanol all it does is boost Monsanto's bottom line and cars run worse on it. *ahem* excuse me.

JohnnyBahamas

The market is demanding it.

I mean, it's not like they got their "bought and paid for" members of congress to mandate it and force the taxpayers to fund it.

Oh, wait... my sweater is inside out.

endless_corners

Exactly - Ethanol promotion is all industry, lobby, and policy driven. I effing hate ethanol. The last thing we need is another input stream fueling BT corn planting. /rant