Post by solareclpse2000 on Sept 8, 2014 23:55:35 GMT -5
Hello everyone, im new to the idea of using E85 and had some questions about my current build plan being compatble and making sure im correctly understanding the requirements to convert to E85. Now that I have my budget mostly planned out I wanted to make sure I understand the use of E85 so I dont waste money on parts. I have an 10 lines to the regulator, I will be running an10 to the fuel distribution block(an08 return), and single lines from the block to each injector. Sorry if this is long and drawn out, im new to the idea of E85 and have much to learn, so i have turned to yall experts to school me here, if yall dont mind
First question, should I run an04 or an06 to each injector?
Engine details: dart block 572 BBC, 8-71 roots by dyers, 10-12 psi boost, 8.4 static compression, custom grind solid roller cam, broodix or AFR aluminum heads, hilborn 4port EFI blow thru, with 8 (possibly 12) injectors all individually fed from distribution block, with a sealed snorkel induction system on top ( building a truck for mud and swamp)
ECU system is still up in the air. I plan on 8 or 12 injectors, a multi pak coil near plug ignition ( LS engine style ) so I need something with many control options. The truck has an on board win7 computer installed in the dash I plan to permanently tether to the ECU. Its a 1993 2 door gmc yukon so never had airbags so I converted the glove box to house the PC, ECU, ignition control box and such. Anyone heard of fsrmotorsports before? Apparently they have an ECU called pro128 that is fully programmable for up 12 injectors, multipak ignition and if you use their in tank fuel sensor it can detect the amount of ethanol in the tank (like if you filled half gas and half E85) and adjust timing as necessary to prevent detonation, also if running turbos can adjust boost as needed. Sounds fancy, and is indeed expensive.
usage; im planning on using the truck for competition in mud, and also as a daily driver. I dont mind if its a little ill mannered on the street but with a final compression ratio of 13.5 ish on 10psi and over 14 on 12 psi I'm sure yall can see the issue with running 91 octane pump gas.
The problem: so, for what i have learned is that E85 can handle this type of compression just fine, yet in my area only 1 station carries it, and its not a 24hr station. So I face the fact that I either have to make a habit of keeping 5 gallons on hand in a jug constantly or I have to be able to switch between 91oct and E85.
The plan; so, what do I do if im sitting on empty, have no fuel jug, and am too far from the only gas station with E85? After much thought and a little research im thinking that I will keep the needed tools in the truck along with multiple blower pullies. Ill run the 10 psi and E85 regularly, keep the 12 psi pullies on hand for bog nights, and keep a 7psi pulley for emergencies. So if I absolutely must run 91 octane I can swap in the 7psi pulley fairly easily at the station and fill up on 91. Now, as for fuel issues, as I seem to understand by the calculations, running this engine on E85 will require 30 percent more flow, which for around 1250 HP at the flywheel on this big of a displacement will require around 110lb/hr injectors running at 80 percent max of course, on about 43.5psi fuel pressure at the block. For normal pump gas. So, if I understand correctly on the calculations, to get 30 percent more flow to support the E85, I can adjust the regulator up to 80psi to meet the 30 percent flow improvement for the E85. So essentially I would be running E85 on 10psi boost and 13.5,,, ish,,, compression regularly at a fuel pressure of 80psi ( the total system will be built for this type of pressure as the norm) so, if Murphys law decides to pay me a visit and I must run 91oct, I swap to the 7psi pulley to drop boost and lower compression to about 11.9,,, ish,,,, drop the regulator to 43.5, or maybe an even 50 psi, to prevent too rich of an A/F ratio, and maybe trim the timing some on the computer for a total of lets say 30 min. Of work, and not blowing my engine up. I would have a preset timing/ignitiin profile saved in the computer for all 3 scenarios to easily switch over.
so is this correct how im understanding it? Or am I totally off base here? I know it would just be so much easier if I didnt want to drive it all the time and just dedicate it to competition, but I just want to be able to drive it regularly, I really love my truck and im willing to do the extra work and spend a few extra bucks to drive it and compete in it. I guess u can say I want to have my cake and eat it too. If yall can share some advice and help me in the process of learning the benefits and compromises of running E85 I would appreciate it.
again, im so sorry this is so long, I have done much research and learned quite a bit, but im still a bit confused on using E85 for performance advantages. But im learning, and hopefully, yall are teaching. Thanks for reading this and future thanks for all the input and advice
First question, should I run an04 or an06 to each injector?
Engine details: dart block 572 BBC, 8-71 roots by dyers, 10-12 psi boost, 8.4 static compression, custom grind solid roller cam, broodix or AFR aluminum heads, hilborn 4port EFI blow thru, with 8 (possibly 12) injectors all individually fed from distribution block, with a sealed snorkel induction system on top ( building a truck for mud and swamp)
ECU system is still up in the air. I plan on 8 or 12 injectors, a multi pak coil near plug ignition ( LS engine style ) so I need something with many control options. The truck has an on board win7 computer installed in the dash I plan to permanently tether to the ECU. Its a 1993 2 door gmc yukon so never had airbags so I converted the glove box to house the PC, ECU, ignition control box and such. Anyone heard of fsrmotorsports before? Apparently they have an ECU called pro128 that is fully programmable for up 12 injectors, multipak ignition and if you use their in tank fuel sensor it can detect the amount of ethanol in the tank (like if you filled half gas and half E85) and adjust timing as necessary to prevent detonation, also if running turbos can adjust boost as needed. Sounds fancy, and is indeed expensive.
usage; im planning on using the truck for competition in mud, and also as a daily driver. I dont mind if its a little ill mannered on the street but with a final compression ratio of 13.5 ish on 10psi and over 14 on 12 psi I'm sure yall can see the issue with running 91 octane pump gas.
The problem: so, for what i have learned is that E85 can handle this type of compression just fine, yet in my area only 1 station carries it, and its not a 24hr station. So I face the fact that I either have to make a habit of keeping 5 gallons on hand in a jug constantly or I have to be able to switch between 91oct and E85.
The plan; so, what do I do if im sitting on empty, have no fuel jug, and am too far from the only gas station with E85? After much thought and a little research im thinking that I will keep the needed tools in the truck along with multiple blower pullies. Ill run the 10 psi and E85 regularly, keep the 12 psi pullies on hand for bog nights, and keep a 7psi pulley for emergencies. So if I absolutely must run 91 octane I can swap in the 7psi pulley fairly easily at the station and fill up on 91. Now, as for fuel issues, as I seem to understand by the calculations, running this engine on E85 will require 30 percent more flow, which for around 1250 HP at the flywheel on this big of a displacement will require around 110lb/hr injectors running at 80 percent max of course, on about 43.5psi fuel pressure at the block. For normal pump gas. So, if I understand correctly on the calculations, to get 30 percent more flow to support the E85, I can adjust the regulator up to 80psi to meet the 30 percent flow improvement for the E85. So essentially I would be running E85 on 10psi boost and 13.5,,, ish,,, compression regularly at a fuel pressure of 80psi ( the total system will be built for this type of pressure as the norm) so, if Murphys law decides to pay me a visit and I must run 91oct, I swap to the 7psi pulley to drop boost and lower compression to about 11.9,,, ish,,,, drop the regulator to 43.5, or maybe an even 50 psi, to prevent too rich of an A/F ratio, and maybe trim the timing some on the computer for a total of lets say 30 min. Of work, and not blowing my engine up. I would have a preset timing/ignitiin profile saved in the computer for all 3 scenarios to easily switch over.
so is this correct how im understanding it? Or am I totally off base here? I know it would just be so much easier if I didnt want to drive it all the time and just dedicate it to competition, but I just want to be able to drive it regularly, I really love my truck and im willing to do the extra work and spend a few extra bucks to drive it and compete in it. I guess u can say I want to have my cake and eat it too. If yall can share some advice and help me in the process of learning the benefits and compromises of running E85 I would appreciate it.
again, im so sorry this is so long, I have done much research and learned quite a bit, but im still a bit confused on using E85 for performance advantages. But im learning, and hopefully, yall are teaching. Thanks for reading this and future thanks for all the input and advice