MuMan
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Re:E85 Fuel to Caltex
Tuesday, May 03, 2011 0:11 PM
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What I mean is low grade in comparison to the fuel the ECU was originally mapped for. Yes, your right, but I was refering to changing the ratio from 80/20 upwards. You can effectively alter the flow rate of the injectors by doing this. basically the only trim you have, along with initial advance, if you want to play around with the blend, in the absence of a EFI/Ign controller. I don't recommend doing it though, just try the 80/20 and see what results you get, then decide what direction you want to go from there..if any. Disclaimer: Anything you do with bio-flex is up to you, and ethanol can affect your pump, tank & hoses
post edited by MuMan - Tuesday, May 03, 2011 0:19 PM
"Have you ever noticed when things get set in motion, the heavy end wants to go first."
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MRTurbo
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Re:E85 Fuel to Caltex
Tuesday, May 03, 2011 0:58 PM
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Can someone enlighten me on what type of fuel the ECU was mapped for??
1990 SW20 GT 3S-GTE Targa 2001 Honda CBR600F4i
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MuMan
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Re:E85 Fuel to Caltex
Tuesday, May 03, 2011 3:25 AM
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The ECU's are programmed for JDM 100RON. I see where you got confused. I was saying the stock ECU's run over rich mixtures and suffer from ign value degredation on straight 98 under boost. \E85 is an oxygenated fuel, so your increasing the air content to fuel ratio by adding it. This naturally increases as you increase the mix ratio, so you have to be careful. This has the effect of increasing VE, and raising AFR's, which is where the power increase comes from, and the increased octane rating allows you to use this, with existing ign mapping without encountering knock issues, which you'd see on 98. This is also aided by the cooling effect of the E85 ethanol, same as methanol/water injection does, and lowers combustion temps, further increasing knock tolerance. Also, because your running the full JDM ignition values, your optimising ign closer to MBT value, so you get increased power from simply restoring the JDM mapping. Hope that explains it..
post edited by MuMan - Tuesday, May 03, 2011 3:55 AM
"Have you ever noticed when things get set in motion, the heavy end wants to go first."
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MR2QIK
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Re:E85 Fuel to Caltex
Tuesday, May 03, 2011 4:04 AM
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Just thought I'd chime in here. I've heard reports from a few friends using E85 that the Bio-Flex stuff @ Caltex runs the same as the barrel E85 they've also used. I'm yet to test this myself, but it's a promising sign.
MR2QIK - "The Little Car That Could"  320rwkw @ 19psi (pump fuel, no giggle gas) 11.96 @ 116mph (with 228rwkw)
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zmit
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Re:E85 Fuel to Caltex
Tuesday, May 03, 2011 2:22 PM
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Well after initially running a high idle for a few runs, it has now sorted itself out and seems to be running fine again. one thing is for sure... it hauls. I honestly can't tell you whether it's all the E85 or whether it was the 14 degrees (remember, i'm still coming to terms with dry cool air down here!) Here is something interesting though.... gen 3 efi, 16 psi, standard (gen 3) fuel, presumably a CT20B or equivalent. I filled up last night with 1.5 gallons of e85 and the rest 93 octane. Full tank, so this is extremely conservative. This is at 16 psi, base fuel pressure 39.5psi, 3rd gear pull from about 3500 rpm to 7k. Looks like I can add a little more e85 next time. Keep in mind this is a gen3 efi conversion, not a real gen3. I have all the bolt-ons & mods for an appropriate gen3 conversion. So just to clarify, the more e85 I put in, the leaner my AFR will appear right? I am open to recommendations!  From here: http://mr2oc.com/showthre...8957&highlight=e85 Th MR2OC 'Alternative Fuels' forum http://mr2oc.com/forumdisplay.php?f=202
post edited by zmit - Tuesday, May 03, 2011 2:32 PM
1992 SW20 GT ... and loving it...
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MuMan
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Re:E85 Fuel to Caltex
Tuesday, May 03, 2011 4:37 PM
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Interesting.. It's the Ethanol alright. Mine went ballistic on 20psi, and I just wasn't prepared for that level of change. It also did the high idle, but only for 20 mins or so, at 1k. Does it have a smoother, more potent feel to it, and a cleaner exhaust note?
post edited by MuMan - Tuesday, May 03, 2011 4:55 PM
"Have you ever noticed when things get set in motion, the heavy end wants to go first."
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MRTurbo
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Re:E85 Fuel to Caltex
Wednesday, May 04, 2011 1:08 AM
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I'm gonna jump on this too soon!! muahaha EDIT: ABOVE ADELAIDE METRO AREA
post edited by MRTurbo - Wednesday, May 04, 2011 2:26 AM
1990 SW20 GT 3S-GTE Targa 2001 Honda CBR600F4i
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MR2QIK
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Re:E85 Fuel to Caltex
Wednesday, May 04, 2011 1:41 AM
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I got all excited then I realised those suburbs aren't the ones near me (same name diff state)...LOL
MR2QIK - "The Little Car That Could"  320rwkw @ 19psi (pump fuel, no giggle gas) 11.96 @ 116mph (with 228rwkw)
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MRTurbo
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Re:E85 Fuel to Caltex
Wednesday, May 04, 2011 2:25 AM
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LOL.....gets em every time
1990 SW20 GT 3S-GTE Targa 2001 Honda CBR600F4i
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MuMan
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Re:E85 Fuel to Caltex
Wednesday, May 04, 2011 2:26 AM
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 Was just reading some of those posts on MR2OC. Loved the one about the guy nearly in the ditch. Those guys are tilting the mix a long way (30-40%!) on stock injectors. Just a word of caution, if your thinking about doing that.. (without being a pain). They are looking solely at AFR's and nothing else., although they all seem to be gen3 ECU's. One problem you need to be aware of is knock. The stock ECU uses low level knock as the first line of defence to protect your engine. Trouble is the knock threshold on mix ratios like that is so high, if there's a problem elswhere, you could suffer engine damage before the ECU sees any appreciable level of knock. So just be careful looking at such high mix ratios. Have fun..
"Have you ever noticed when things get set in motion, the heavy end wants to go first."
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MRTurbo
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Re:E85 Fuel to Caltex
Wednesday, May 04, 2011 2:36 AM
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Okay just trying to understand what you mean: In other words, using a high percentage (30-40%) of E-Flex in your tank compared "normal" petrol makes your ECU complacent towards knock so if there is knock present in the future (due to another condition), then the ECU wont be quick enough to react??
1990 SW20 GT 3S-GTE Targa 2001 Honda CBR600F4i
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MuMan
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Re:E85 Fuel to Caltex
Wednesday, May 04, 2011 3:25 AM
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Well basically yes, not to suggest this is inevitable, but if you run high ratios like that and boost to much higher psi levels, you can stress the engine to a point where mechanical failure takes place, prior to any appreciable knock levels detected. Much better to stick with 20% or even 25% maybe, and work from there being safe, until we get some more data on how far you can safely go. Anyhow, if your basically stock, 40% isn't going to give you any more than 20% is, and it will limit your power potential. The real power is in the 98 (more energy, less volume), with the Ethanol supplying the enhancing benefits I spoke about earlier.
post edited by MuMan - Wednesday, May 04, 2011 3:40 AM
"Have you ever noticed when things get set in motion, the heavy end wants to go first."
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just_ace
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Re:E85 Fuel to Caltex
Wednesday, May 04, 2011 3:38 AM
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screw all of you  .......last time i checked we still don't have any over here in WA.
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surok
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Re:E85 Fuel to Caltex
Wednesday, May 04, 2011 4:37 AM
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i wont run it until it is all over NSW so i can still tour with the car. but i would like a legitimate 500hp street Mr2 :)
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purple5ive
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Re:E85 Fuel to Caltex
Wednesday, May 04, 2011 5:43 AM
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will this 80/20 mix cause any fuel system failures, like, pump, rail, injector etc failing prematurely.. im still on my 20 year old fuel components.
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