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Old 09-06-2012, 02:28 AM   #1
Kyle_J
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Default Wanting to switch to e85

Well basically I have an STi with fully built motor that I am wanting to switch from 93 + meth to e85. Current setup is:
GT30r
Topfeed ID1000's
-10 lines to aeromotive rails
Walbro 255 rewired
Fuel lab FPR
AEM EMS

My question is whether I can switch straight to e85 without changing my fuel system, only getting retuned.
At 20 psi my injector duty cycle is right around 50%. From some basic reading e85 usually requires around 30% more fuel which makes me think I am able to switch over just by retuning.
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Old 09-06-2012, 02:36 AM   #2
07wrx84
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Should be fine but with that turbo and " built " motor! You could run out of head room real quick with those injectors!
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Old 09-10-2012, 08:01 PM   #3
WReXd
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Your FIDC is only 50% probably because of methanol injection. It's making up for the lack of fuel. Without meth injection you'd probably be at 70% IDC or so. You will definitely need larger injectors. IIRC some people are maxing out ID1000's with much smaller (18g-sized) turbos.
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Old 09-12-2012, 02:38 AM   #4
cRashtEstDumy
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Quote:
Originally Posted by WReXd
Your FIDC is only 50% probably because of methanol injection. It's making up for the lack of fuel. Without meth injection you'd probably be at 70% IDC or so. You will definitely need larger injectors. IIRC some people are maxing out ID1000's with much smaller (18g-sized) turbos.
Agreed^^^ I'd go with bigger for sure! The DeatschWerks 2200cc would be ideal for running E85 and would certainly cover you well! The only other thing I'd worry about next is the fuel pump being E85 compatible and powerful enough! The 255 rewired might last you but to be safe and to get the full potential out of your set up I'd either go with the DW300 or the Aeromotive 340lph. Either one would work well for the GT30R

http://www.deatschwerks.com/products...tank-fuel-pump

http://www.deatschwerks.com/products...tank-fuel-pump

http://aeromotiveinc.com/products-pa...-inlet-inline/

Good luck! Have fune!
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Old 09-12-2012, 09:00 AM   #5
Source,LLC
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As everyone else said you will run out of injector with that turbo, but you should still have no problem running e85 as is. Your tuner should still be able to net you more power and torque then you are making now, but some bigger injectors would make the setup a lot more enjoyable
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Old 09-12-2012, 09:25 AM   #6
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Quote:
Originally Posted by cRashtEstDumy View Post
Agreed^^^ I'd go with bigger for sure! The DeatschWerks 2200cc would be ideal for running E85 and would certainly cover you well! The only other thing I'd worry about next is the fuel pump being E85 compatible and powerful enough! The 255 rewired might last you but to be safe and to get the full potential out of your set up I'd either go with the DW300 or the Aeromotive 340lph. Either one would work well for the GT30R

http://www.deatschwerks.com/products...tank-fuel-pump

http://www.deatschwerks.com/products...tank-fuel-pump

http://aeromotiveinc.com/products-pa...-inlet-inline/

Good luck! Have fune!

^ it doesn't appear that you have any actual experience with E85. your recommendations sound like you literally googled everything to come up with the response. a dw300 or aero340 are good suggestions, but they are horribly mismatched with your injector recommendation...not only that, but his IDC's would only be like 50% at the highest with those 2200cc injectors. that isn't really an ideal or matched fuel system. will it work, yes, but is it correct, no.



to the OP, you can just switch over, but you are going to be fuel system limited.

the walbro 255 even with the rewire is only going to flow approx 180LPH at full boost. the ID1000's usually actually flow closer to 900cc which is a demand of almost exactly 180LPH at 85%IDC. if your's actually flow 1000cc, you would be demanding over 200LPH at 85%IDC. this means that your walbro 255 will be maxed out at anything over 85% IDC. my guess would be that your IDC's without meth on 93oct are actually sitting around 70%, and this means that you would probably gain pretty much NOTHING switching to E85 on your current fuel system.



now you have a few options on what to do if you still actually wanted to switch over...


option 1- raise fuel pressure to increase injector output, and switch to a larger fuel pump like the walbro400. the dw300 and aero340 are going to be pretty close to maxed with the increased fuel pressure so those aren't exactly ideal for this option.

option 2- get larger injectors, keep fuel pressure the same, and switch to a larger fuel pump like the dw300, aero340, or walbro400. keep in mind that VERY large injectors MAY cause light throttle or idle issues. so it is ideal to try and match things as much as feasible. obviously, if you are planning to go larger on the power at some point, it makes sense to get larger stuff so you aren't buying things twice, but it is always better to get things that are properly matched for your system than going WAY overboard.

option 3- raise fuel pressure to increase injector output, and get a boost-a-pump setup for your walbro255. this will raise the fuel pump output significantly to allow you the headroom necessary to run E85.

option 4- get larger injectors, keep fuel pressure the same, and get a boost-a-pump setup for your walbro255.


...in my opinion, option 2 is the most correct route to go, but any of these options will work just fine and get you what you are looking for.

Last edited by amalgrover; 09-12-2012 at 09:31 AM.
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Old 09-12-2012, 04:03 PM   #7
Kyle_J
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What I am thinking about doing is going with either one walbro 400 or two 255's, surge tank, some sort of external pump and a set of ID2000's. I am not a fan of deatschwerks products I have heard too many bad stories about them. Eventually I will be switching to a much larger turbo so I might as well go overkill on the fuel system now.
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Old 09-12-2012, 04:16 PM   #8
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thats alot of fuel...must be planning a pretty ridiculous turbo setup
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Old 09-12-2012, 04:24 PM   #9
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Looking at either a 6266 or maybe a GT37r
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Old 09-12-2012, 06:26 PM   #10
amalgrover
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those are big turbos, but honestly the fuel system you described is overkill even for those turbos
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Old 09-26-2012, 12:46 AM   #11
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Don't forget a good fuel filter like a Golan. Don't want to restrict your flow.
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Old 09-29-2012, 04:47 PM   #12
Turbo_Carl
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I run an Aeromotive 340lph in my car and it handles E-85 very well.
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Old 10-02-2012, 02:42 PM   #13
Kyle_J
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Quote:
Originally Posted by amalgrover
those are big turbos, but honestly the fuel system you described is overkill even for those turbos
I will need the injector for e85, the surge tank is for in case a pump fails or i go lean for some reason. Not really overkill.
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