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Old 10-26-2012, 06:33 AM   #1
Scooby Newbie
Member#: 273440
Join Date: Feb 2011
2011 WRX

Default Blouch 2.5 xtr on 2011 wrx on E85

Can anyone let me know what would the recommended size injectors be for this turbo? I'm getting ready to install the turbo and fmic this weekend. I'm running 1000 dw now on e85.
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Old 10-26-2012, 09:04 AM   #2
Scooby Newbie
Member#: 261863
Join Date: Oct 2010
Chapter/Region: MAIC
Location: Delaware
2015 Focus ST


Asking your tuner would be your best bet.
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Old 10-26-2012, 10:27 AM   #3
Scooby Newbie
Member#: 335033
Join Date: Oct 2012
Chapter/Region: NESIC
Location: Holyoke, MA
2009 wrx
Dark Gray Metallic


How much boost/HP do u want?

Assuming max HP(490hp). Since stoich on e85 is 9.7 and gas is 14.7. u need about 50% more fuel to be at lambda 1. If you use the RC eng injector calculator it says you need 1000cc injectors to flow 490hp on gasoline. so you should need 1500cc injectors to flow 490hp on E85. U can push the IDC up alittle to 90% and you could get up to roughly 400chp on those 1000cc injectors. This is pump gas corrected for the E85 so you could get alittle more HP because you can bump the timing up because the e85 has a higher octane rating, but you need alot more flow for E85 to get the same HP roughly as pump gas because of the lower energy density.

max boost on those injectors with e85 would probably be around 30psi at 4000rpm and you would have to taper back to 18psi at 6000rpm. If you go over 18psi at 6000rpm your injectors might not flow enough. This would give you around 400chp(325whp??)@6000rpm.

I would upgrade the injectors just so you can actually reap the benefits of E85. You could get more HP on those injectors with pump gas.
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Old 10-26-2012, 10:31 AM   #4
Wicked Performance
Former Vendor
Member#: 265606
Join Date: Nov 2010
Chapter/Region: NESIC
Location: Manchester, NH

I normally would suggest using FIC1150s. What engine management are you using?
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Old 10-28-2012, 10:24 AM   #5
IA Performance
Member#: 25194
Join Date: Sep 2002
Chapter/Region: RMIC
Location: Boulder, CO
2008 Forester XT 5mt
Dark Gray


better yet, what type of internals do you have Assuming stock pistons I personally would not try to push it much past the 350-370 whp mark. Granted, at 25% drivetrain loss this puts the power at 440-470 hp. The next size increase in injectors is: ID 2000 or FIC 2150. Alternatively, you could try increasing fuel pressure, but that would require a FPR. Either way, it looks like money will need to be spent if those power levels are desired.

As a heads up on the FMIC, if you live in a hot climate I would suggest investing in a upgraded radiator since the airflow to the stock radiator will be greatly decreased with the FMIC. This was only an issue for our customer in Arizona where the temps are 90-105 in the summer.

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Old 10-29-2012, 06:34 PM   #6
Scooby Newbie
Member#: 273440
Join Date: Feb 2011
2011 WRX


Thanks to all for the great input. And thanks for heads up on the radiator concern.
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