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 Post subject: Pistons & boost or E85 Flex
PostPosted: Wed Jan 17, 2018 12:15 am 
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I Say: I JUST WANT QUICKER SPOOL UP WITH MORE TOP END
Vehicle: MY09 SH Forester XT Premium

Posts: 28
Location: Sydney
Tossing up between putting in a set of pistons in order wind up the boost or go E85 Flex Fuel tune with the stock internals.
It's a tuned EJ255 VF34 about 220kw. I can't boost it anymore safely without better pistons. E85 tune should be safe with the high octane knock resistance.

Bang for buck I guess.

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 Post subject: Re: Pistons & boost or E85 Flex
PostPosted: Wed Jan 17, 2018 12:37 am 
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Vehicle: Black My07 XT

Posts: 4523
Location: South East Melbourne
sounds to me like you need a built motor and a bigger turbo. your pretty much at the limits of your setup to stay reliable

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 Post subject: Re: Pistons & boost or E85 Flex
PostPosted: Wed Jan 17, 2018 8:46 am 
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I Say: Do or do not, there is no try.
Vehicle: MY17 BRZ, MY11 BT-50

Posts: 16196
Location: Medowie (near Newcastle), NSW
That's just the engine you'd have to do. You would also need to consider the rest of the drivetrain. At a minimum the clutch will give up if you go much higher than where you are now.

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 Post subject: Re: Pistons & boost or E85 Flex
PostPosted: Wed Jan 17, 2018 9:07 am 
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I Say: Car mods are like OddBodz, you got to collect them all! -------------------------------------
Vehicle: MY05 STi swapped sled

Posts: 17473
Location: Spearwood Perth WA
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 Post subject: Re: Pistons & boost or E85 Flex
PostPosted: Wed Jan 17, 2018 10:26 am 
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I Say: There's no 'i' in Team, but there is in Winner!
Vehicle: MY10 XT

Posts: 1619
Location: Mealbun Orstraya
Im going manley pistons and h-tuff rods with e85. That’s what was highly recommend by the engine builder and tuner.


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 Post subject: Re: Pistons & boost or E85 Flex
PostPosted: Thu Jan 18, 2018 1:02 pm 
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I Say: Plan for tomorrow,Live for TODAY!
Vehicle: MY12 XT

Posts: 70
Location: Sydney
My experience with stock internals....

You will get about a 10-20% power increase with E85, mainly though more aggressive tuning because of the higher octane (less prone to premature detonation). i.e. Safer.

You will need bigger injectors, at least 1000cc, it leaves room to move, 75% is what my peak IDC is currently.

It is certainly a good step up, since you use 30% more fuel, you need to fill up more regularly. I have been tracking pricing and consumption. It works out to be about $5 more per tank than if I was using 98. It is worth the power.

If you are in VIC - excellent - E85 easily found.
NSW - a little scarce - see my post on NSW fueling stations.
another fun fact, can only safely store E85 in metal ! PVC jerry cans and bladders are not certified to store E85, as they expand the material.....

And yes - heavy duty clutch to handle the power. Assuming you would already have one.

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 Post subject: Re: Pistons & boost or E85 Flex
PostPosted: Thu Jan 18, 2018 2:08 pm 
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I Say: Car mods are like OddBodz, you got to collect them all! -------------------------------------
Vehicle: MY05 STi swapped sled

Posts: 17473
Location: Spearwood Perth WA
Ive been storing e85 in plastic jerry cans for about 6yrs. No problems.

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 Post subject: Re: Pistons & boost or E85 Flex
PostPosted: Thu Jan 18, 2018 2:12 pm 
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I Say: Car mods are like OddBodz, you got to collect them all! -------------------------------------
Vehicle: MY05 STi swapped sled

Posts: 17473
Location: Spearwood Perth WA
After market AN Rubber hose on the other hand. After about 2-3 yrs it disintergrated enough to clog the fuel filter and physically collapse the filter medium.

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 Post subject: Re: Pistons & boost or E85 Flex
PostPosted: Thu Jan 18, 2018 10:14 pm 
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I Say: Fozzy fozzy fozzy, oi oi oi!
Vehicle: 2011 Forester S-Edition WRB

Posts: 1393
Location: 3015
If you are going to open the engine you may as well go to town, not much more $

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 Post subject: Re: Pistons & boost or E85 Flex
PostPosted: Thu Jan 18, 2018 10:35 pm 
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Vehicle: MY08 XT (SH)

Posts: 975
Location: Brisbane
clayq wrote:
If you are going to open the engine you may as well go to town, not much more $


Conversely, an E85 upgrade is a handful of relatively cheap bolt-ons and a tune.

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