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Old 03-25-2009, 06:46 AM   #1
Scooby Newbie
Member#: 168654
Join Date: Jan 2008
Chapter/Region: SWIC
Location: Phoenix
2005 WRX
some form of black

Default e85 injector size, and boost control questions

I will be going for an e85 tune on my wrx within the month, and I had a few questions. first the setup:
tdo6 20g 7cm
ssac fmic
aps inlet,stp intake
tgv deletes
3" tbe, gutted stock uppipe

-I have asked two highly regarded tuners about injector sizing on my setup; one said 850's, and the other said 1000-1200cc injectors. Everything I've read said I should need in the 850-900 range so can anyone offer me any more info on this?

-second, boost controll on my car is currently stock, and the IWG actuator on my turbo is set at about 10psi. Will I need a better boost controller and or a new wastegate actuator to hold boost in the 22-25psi range?
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Old 03-25-2009, 08:02 AM   #2
jason miller
Scooby Specialist
Member#: 158313
Join Date: Sep 2007
Location: W Laf, In
2003 WRX


First, who's tuning the car? The tuner should have final say, since they will have to work with whatever you decide on. However...

There's a thread in the built motor forum in regards to some Bosch 1000's that appear to be the bee's knees. JSarv is running his 18g/e85 setup with them, and loves them. But be careful, because apparently there are some fakes?? The injectors in the thread run $460 per four, fyi. If you can spring the cash, and your tuner is ok with them, that's the way I'd go.

As to the boost control, I don't know if the stock solenoid will be sufficient. I do know that aftermarket 3 port solenoids tend to have better boost control/response. I don't see why anyone would run the stock solenoid with any kind of protune.
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Old 03-25-2009, 02:11 PM   #3
Scooby Specialist
Member#: 63292
Join Date: Jun 2004
Chapter/Region: South East
Location: Warner Robins, GA
2000 Subaru 2.5RS
2002 WRX powered


with the 22-25 psi range, I would suggest the 1000cc range. It can't hurt to have extra injector duty cycle in hand, only difference is the cost.

I'll be running 860's with my Super16G in around the same boost range. Kinda stuck with that size since they dont have 1000cc side-feeds which I switched to. It should work, but will be cutting it close, might need to increase the fuel pressure a bit.

Like Jason said, the tuner should be the final say in your decision. And for the boost control solenoid, get a 3-port. GM one is cheap and effective, no reason not to buy one.
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Old 03-25-2009, 02:49 PM   #4
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Go with what your tuner recommends on both these items and DO NOT listen to us on either of these issues or it may cost you.
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