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09-15-2013, 01:13 PM | #45 | ||
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Stoic of gasoline is 14.7:1. Stoic of E85 is 9.76:1. Pretty big difference. You start mixing E85 with gas at say 30% and now your ideal stoic is 13.2:1 instead of 14.7. So now your engine has no ideal that when it targets 12.2:1 for the most power, its actually running lean! And that creates more heat than your engine would see with a proper tune, it also leaves your engine prone to knocking. All of this extra heat can cause premature failure of spark plugs, injectors to melt (like these filters!), exhaust valves to cook, and in extreme cases total failure of the engine. Tuning is HUGE to engine reliability and most people don't take it seriously enough around here.
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09-15-2013, 02:32 PM | #46 |
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@ervgotti01
Just like your initial post, and just as I said......you pulled out of this thread exactly what you wanted to see to support pre-conceived notion but are basing it on very little. As I said....I don't care what you run, or about your opinion as thus far you have failed to support your "theory" with any data. Good luck to you....
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09-15-2013, 02:54 PM | #47 | ||
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I was talking about my factory, LPFP. I am running COBB's E30 mapping, with E30 fuel (confirmed) and had zero issued on my logs and all supporting mods. This was even confirmed by COBB's engineer himself about the LPFP issue and ethanol. It is hit or miss. I never said anything else failed. Others have. I love E-85 mixes on our cars, but after my experience on my third LPFP now, I will stick to 93 oct. which hasnt given me any issues to date. BTW, a LPFS = Low Pressure Fuel Sensor on the fuel rail right next to the HPFP.
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09-15-2013, 04:02 PM | #48 | |
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BTW...an LPFS may be a Low Pressure Fuel Sensor but what is an "LFPS"? and how the heck could e85 be blamed for that?
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09-16-2013, 05:30 AM | #49 | ||
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Because it is safe, ffs guys. Ed: and why would you keep replacing stock lpfp? Just get an upgraded one (or at least an inline to lessen the load And why and how would the lpfs be on the fuel rail which has high pressure fuel? :/ And if you keep replacing plugs to factory specs ... And you're highly tuned... Yes you'll have to replace them. Go 1 step colder gapped for a reason. Plugs struggling will also lead to dead coils due to more load... Seriously, everything going wrong here seems to be a problem going wrong between the car and the person driving the car... And lastly (for now)... Ethanol does not eat rubber.. It's less corrosive than unleaded... What it does.. Is hold water If you have old ALREADY WORN rubber, that has some water in it in the cracks... The ethanol absobs that water and cracks the rubber further - this is called dry rot Ok we learnt something now? |
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09-17-2013, 01:54 PM | #50 |
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For a track day why not just mix in 100 oct instead of messing with E85!!??
I can see where E85 would be cool for a DD solution but not at the cost of part failures!
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09-17-2013, 02:20 PM | #51 | |
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So, the ECU certainly DOES have an idea as it uses the oxygen sensors to trim fuel. It should complain (i.e. throw a CEL) if your gasoline content is off too much and it has to trim more than is "acceptable". Pretty much any car with oxygen sensors will try to trim fuel to some extent, and here in the states even pump 87 can have 0% to 10% ethanol content. Newer cars are extremely savvy with it and store all sorts of various fuel trims for different situations.
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Last edited by Freon; 09-17-2013 at 02:26 PM.. |
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09-17-2013, 06:26 PM | #52 | |
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09-18-2013, 04:58 AM | #53 |
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So to clarify for those reading this and going...WTF? Very quickly and not too in depth...
Our oxygen sensors are reading lambda as was said. At idle/cruise the goal is to burn all the fuel for economy and emissions. When this is achieved we get a lambda value of 1.0 which is basically just a correlation to a voltage value fed back from the O2 sensor. With gasoline, to achieve this we have to start with approx. 14.7 grams of air and 1 gram of fuel at the beginning of the combustion process. Thus a value of 14.7 is assigned in the software...i.e. JB4, Cobb...whatever. For a true E85, in order to reach that Lambda target of 1.0 we start with a mixture of 9.8 grams of air to 1 gram of fuel. Since the software is programmed that a lambda of 1 = 14.7, our software still reads 14.7 even though it is really 9.8 which is really 1 So, when you go and put E85 in your tank and the DME is trained/programmed to tell the injectors to spray at a rate of 14.7 to 1, when in reality you need to be spraying at 9.8 to 1...guess what happens....you run very lean but the DME quickly adjusts thanks to the O2 sensors. However, the DME can only adjust so much (unless properly tuned) and as you can see with E85 you need to spray a lot more fuel. Once outside the DME's limits and it can no longer spray enough fuel, you quickly run lean. When you do so your cylinder temps rise...blah blah blah at which point you get detonation (fuel igniting with no spark and at the wrong times) and if you're the OP, you melt your injector filters, but only enough that you can't run E85 and they still flow gasoline just fine...or is it that with E85 he was running too lean and misfiring J/K...who knows what he did and most importantly...neither does he so take the "Word to the wise" portion of this thread title with a grain of salt.
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09-18-2013, 08:57 AM | #54 | |
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09-26-2013, 10:17 AM | #55 | |
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yea I had 50k on the OEM plugs so I just replaced those because it was time.
I brought the ones from BMS. 11.74ea.When the car was at bmw they said those were after market and no CPO work/injectors would be warrantied because those are aftermarket so i'd need to replace those with BMW's ones that Bosch makes witch are the same ones from the BMS website. so that was a new set of 6 for $140 FML Quote:
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10-22-2013, 04:33 AM | #56 | |
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