GC8 WRX E85 or not?

GRK-90D
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GC8 WRX E85 or not?

Postby GRK-90D » Wed Jan 04, 2017 12:53 pm

Hey everyone,

I've got a GC8 WRX and am stuck on choosing between flex fuel or just a straight E85 tune.

I already know to upgrade my injectors and what not for a e85 uograde, I'd just like to get some feedback/opinions on what you have done in the past.

Its just a weekend car and not doing big track days. Just want a fast street car basically.

E85 is accessible within my area so that isn't an issue.

Got quoted a difference of $3000 between straight e85 tune or e85 on flex fuel because of the need of more tuning and haltech ps1000 ecu so im tossing up between the 2. Is it really worth the extra 3 grand?

Feedback would be greatly appreciated!

Thanks

mv75
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Re: GC8 WRX E85 or not?

Postby mv75 » Wed Jan 04, 2017 1:15 pm

In your choices, just get e85. That's all I'll say on that.

GRK-90D
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Re: GC8 WRX E85 or not?

Postby GRK-90D » Wed Jan 04, 2017 1:28 pm

mv75 wrote:In your choices, just get e85. That's all I'll say on that.


It sounds like you want to say more though? lol

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Re: GC8 WRX E85 or not?

Postby mv75 » Wed Jan 04, 2017 4:53 pm

Put that 3k toward a bigger turbo and intercooler. Should be able to fit a vf34 with process west top mount fitted by a shop for $3k. Make it worth the upgrade to e85. The car will friggin fly.

GRK-90D
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Re: GC8 WRX E85 or not?

Postby GRK-90D » Wed Jan 04, 2017 6:19 pm

mv75 wrote:Put that 3k toward a bigger turbo and intercooler. Should be able to fit a vf34 with process west top mount fitted by a shop for $3k. Make it worth the upgrade to e85. The car will friggin fly.



That sounds very tempting now..... definitely leaning towards just an e85 conversion so more $$$ for more mods

mv75
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Re: GC8 WRX E85 or not?

Postby mv75 » Wed Jan 04, 2017 8:11 pm

What year and turbo are you running right now?

GRK-90D
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Re: GC8 WRX E85 or not?

Postby GRK-90D » Wed Jan 04, 2017 8:20 pm

mv75 wrote:Put that 3k toward a bigger turbo and intercooler. Should be able to fit a vf34 with process west top mount fitted by a shop for $3k. Make it worth the upgrade to e85. The car will friggin fly.


do you think that a stock clutch kit would handle that power? e85, vf34, process west tmic, 1000cc side feed injectors??

mv75
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Re: GC8 WRX E85 or not?

Postby mv75 » Wed Jan 04, 2017 9:15 pm

I'd imagine it should, just don't dump it. Others will have to have a say on that as when I ran that combo on flex fuel I had an auto, and it's way stronger than manual.

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Re: GC8 WRX E85 or not?

Postby GRK-90D » Wed Jan 04, 2017 9:39 pm

mv75 wrote:What year and turbo are you running right now?



at the moment i've just got a 99 GC8 WRX with a vf28 turbo, sti tmic, walbro 500hp fuel pump, 3in turbo back exhaust, GFB BOV and a ECUtek tune. it was tuned 5 years ago at 185kw atw on 15pounds. ive definitely out grown the power of the car

GRK-90D
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Re: GC8 WRX E85 or not?

Postby GRK-90D » Wed Jan 04, 2017 9:41 pm

mv75 wrote:I'd imagine it should, just don't dump it. Others will have to have a say on that as when I ran that combo on flex fuel I had an auto, and it's way stronger than manual.



true, ill have to see how it goes because i would like to take it to the strip to see what it can get. ill save the 600 + labour for now and see it goes with just bigger injectors, turbo and intercooler..

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Re: GC8 WRX E85 or not?

Postby mv75 » Thu Jan 05, 2017 5:34 am

Ok, you've got a quick car as it is. You should see gains on the e85 tune with what you do currently have.

GRK-90D
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Re: GC8 WRX E85 or not?

Postby GRK-90D » Thu Jan 05, 2017 7:14 am

mv75 wrote:Ok, you've got a quick car as it is. You should see gains on the e85 tune with what you do currently have.



The performance shop im talking to is trying to convince me to still do the e85 flex fuel with the haltech ps1000. Im trying to figure out if hes more worried for my back pocket or his... but like i said thats another 2-3k i can reuse elsewhere like a turbo and tmic.

I dont want to do all this work and keep the vf28 and find out its my biggest restriction afterwards either

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Re: GC8 WRX E85 or not?

Postby stockhorse » Thu Jan 05, 2017 8:09 am


mv75
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Re: GC8 WRX E85 or not?

Postby mv75 » Thu Jan 05, 2017 12:37 pm

Wow. No. It looks like it just adds pulse width to the signal sent by the ecu. There is no timing or other changes possible. I would not run that at all, especially on a stock vehicle. You'll run out of injector and fuel pump. Plus the stock ecu depending on model only allows for a dynamic change in the average area of 12.5% +/- fuelling. You'll run out of that very quickly on e85. I have an addition of approximately +45% at the e70-90 mark on my scale table. It scales between the 30 or so percent I have set at e70 through to the 45% set at 90 depending on the value return by the flex sensor. So inbetween is the average of 30-45, ~35%. That's just the higher end of the scale, it goes from 0-100% ethanol content, this is where the flex comes from.

That device may be ok to run on an N/A vehicle. It would just allow you to run e85 with no performance benefit. Turbos just need too much extra fuel as you're adding on average another atmosphere of pressure on top of what an N/A pulls, needs more fuel.

The performance shop im talking to is trying to convince me to still do the e85 flex fuel with the haltech ps1000. Im trying to figure out if hes more worried for my back pocket or his... but like i said thats another 2-3k i can reuse elsewhere like a turbo and tmic.

I dont want to do all this work and keep the vf28 and find out its my biggest restriction afterwards either


It's just too expensive for what it is. Flex is awesome, but that's a rip off. Plus any good shop will do discounted or free retunes after your first tune as well. So you could tune now then upgrade and retune again.

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Re: GC8 WRX E85 or not?

Postby blackrex » Thu Jan 05, 2017 2:26 pm

That and a Haltech PS1000 is old hardware. There are newer ECU's available that do this.
"The problem with socialism is that you eventually run out of other peoples money." Margaret Thatcher.

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GRK-90D
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Re: GC8 WRX E85 or not?

Postby GRK-90D » Thu Jan 05, 2017 3:01 pm

Sorry, it's 2 grand not 3 but yeah it is a lot of money. A bigger turbo, intercooler and injectors is worth the money rather than flex fuel and another ecu when i will only use it on e85 to take advantage of the power gains

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Re: GC8 WRX E85 or not?

Postby ryano » Thu Jan 05, 2017 3:07 pm

look into eculabs it makes to stock ecu tunable without ecutek and can run MAFless to get rid of the sheet MAF on the my99/00, im about to ditch my ps1000 and go with eculabs

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Re: GC8 WRX E85 or not?

Postby stockhorse » Thu Jan 05, 2017 9:04 pm

Don't want to hijack the thread but, what is needed for MAFless.

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Re: GC8 WRX E85 or not?

Postby ryano » Fri Jan 06, 2017 10:52 am

stockhorse wrote:Don't want to hijack the thread but, what is needed for MAFless.


my99/00 MAF are very unreliable, when they begin to fail they lean the car out and because the ecu thinks its less airflow than really is it thinks its at lower load so add timing this can lead to engine failure

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Re: GC8 WRX E85 or not?

Postby stockhorse » Fri Jan 06, 2017 1:12 pm

ryano wrote:look into eculabs it makes to stock ecu tunable without ecutek and can run MAFless to get rid of the sheet MAF on the my99/00, im about to ditch my ps1000 and go with eculabs


Sorry ryano, I meant what else do you need (apart from ecu capability) to run MAFless. I am assuming you would run MAP instead.

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