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Old 04-16-2012, 12:17 AM   #1
shocker47
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Default E85: WRX VF39 EWG or FMIC or both?

Hey guys, I have a 07 wrx with the following mods: vf39 turbo, full hks exhaust system, short ram, Ebay tmic. I will be adding: 850 or 1000cc injectors, fuel pump.. Right now I am deciding if I should get a FMIC or a EWG.. I will be running E85 and I just wondering which would be more beneficial. I live in Chicago, IL so weather is 85+ in summer and cold in winter. If I were to get a EWG what should I look at? 38mm or 44mm and what spring pressure?

Thanks!
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Old 04-16-2012, 08:43 AM   #2
RP31
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Honestly I ran a 20G with an eBay TMIC and it was fine. FMIC might be overkill, but an EWG on a VF39 could net you some gains. But both will help for future upgrades (if planned.) I'd get the EWG. As for the size and spring pressure, what is your target boost and what are your upgrade plans in the future regarding turbochargers?
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Old 04-16-2012, 02:27 PM   #3
shocker47
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Well i will be running e85 and around 20-23 psi on the vf39. In the future I will be getting either a 20g or fp green.. Depends but for atleast this year i will be running the vf39 on e85
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Old 04-17-2012, 12:28 AM   #4
rymaggi
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how long do u think your tranny will last, im also about to be building my turbo project for my 06 but i dont know if im gonna hit the e85 or just leave it on pump gas.
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Old 04-17-2012, 03:25 AM   #5
NoGraffix
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Dont waste your time with an FMIC for that small of turbo, you are better off keeping the tmic. Although a better quality one (hell even an STI top mount) would be really worth it. I'm not sure who tuned the car but I can almost guarantee they told you (or should've told you) that an ebay top mount is extremely inefficent at actually cooling your charged air. A tuner will be able to add more timing to your current tune with a more efficient top mount.

As far as your question goes: EWG without a doubt. It'll net you better boost control, no overboosting/spiking, and more top end power. I'm running e85 (also in chicago; des plaines actually) and the quality at the station by my house is 91% ethanol, so I've got my timing and boost turned up pretty good right now.

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Old 04-17-2012, 07:39 AM   #6
weirdpuffy
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ive been reading somewhere that the max boost is 21 psi for vf39. unless thats for pump gas. might be wrong!
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Old 04-17-2012, 10:20 AM   #7
ehiddenidentity01
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Quote:
Originally Posted by shocker47 View Post
Well i will be running e85 and around 20-23 psi on the vf39. In the future I will be getting either a 20g or fp green.. Depends but for atleast this year i will be running the vf39 on e85

i would not run that much boost on the 39. thats out of its efficiency range. not to mention you will prolly grenade the journal bearings. 20 psi on e-85 with a fmic would get u over the 300hp mark ewg is not important on that turbo. fp turbos yes that would be a nice upgrade. fmic will do good things though the tmic is not gonna do **** at those pressures.
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Old 04-17-2012, 04:44 PM   #8
Bizarre11
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Save for a shortblock build, a had a very similar set up on my old Wrx and my cyl 4 piston was fried within a few thousand miles while going easy on it
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Old 04-17-2012, 04:57 PM   #9
WRXt4cy
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Quote:
Originally Posted by Bizarre11 View Post
Save for a shortblock build, a had a very similar set up on my old Wrx and my cyl 4 piston was fried within a few thousand miles while going easy on it
You had detonation on a E85 tune? I haven't heard of that yet.


To the OP: As others have said, stick with a top mount, upgrade to an STi one if you want or a high quality top mount. Don't every buy ebay intercoolers as they are less efficient that quality ones.

You don't need an EWG on that turbo with E85. E85 burns cooler and has very high knock resistance so it can handle the extra heat from running close to or over the VF39's efficiency range. It seems a lot of guys push those turbos up to 23/24 psi. They won't hold it for long but it gives a nice punch when power comes in. The harder you push a VF39 the faster it can wear it out but it sounds like you are planning to upgrade anyway.

I've got my VF48 spiking up to about 22 psi on E85. I could go higher but I'm happy with the power and want my turbo to last as long as it can.
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