GC8 WRX E85 or not?

ryano
Impreza WRX Driver
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Joined: Thu Aug 19, 2010 9:12 pm

Re: GC8 WRX E85 or not?

Postby ryano » Fri Jan 06, 2017 1:22 pm

stockhorse wrote:
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.


i read you question wrong sorry, most ecus come with a seperate MAP sensor in the ecu case so nothing needed but tuning, with the eculabs ecu (stock ecu unlocked in france then sent back) you just need another MAP sensor for my99/00 as the stock one switched to atmosphere at times for a few compensations at which time the manifold pressure will be unknown

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

Postby GRK-90D » Sat Jan 07, 2017 6:25 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.


hey mate, just going back to your comment on this. Is there much of a difference between the VF28 and VF34? I've been reading up on it and I've found that they are almost identical in power potential. What do you think of this? Have you had much work on both turbos?

Thanks man

mv75
WRX STi Driver
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Joined: Sat Dec 27, 2014 9:26 pm
Location: Brisbane Northside.

Re: GC8 WRX E85 or not?

Postby mv75 » Sat Jan 07, 2017 8:42 pm

Yea I said that before I knew you had the vf28 and sti intercooler and the exhaust, etc. That's why I followed up with you have a quick car now, you'll see gains on e85.

I had a vf34 with process west running flex on my gc8. I noticed the difference on e85 over 98 like day and night. It was like it was running in winter time even in the dead of summer.

I'd see if there were other shops and options first too. 3K is still way too much for a flex conversion, you already have the bits, it'll just be sensor and ecu and tuning. And the sensor is cheap as if you use a genuine GM flex sensor.

GRK-90D
Learner Driver
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Joined: Wed Jan 04, 2017 12:41 pm

Re: GC8 WRX E85 or not?

Postby GRK-90D » Sat Jan 07, 2017 8:52 pm

mv75 wrote:Yea I said that before I knew you had the vf28 and sti intercooler and the exhaust, etc. That's why I followed up with you have a quick car now, you'll see gains on e85.

I had a vf34 with process west running flex on my gc8. I noticed the difference on e85 over 98 like day and night. It was like it was running in winter time even in the dead of summer.

I'd see if there were other shops and options first too. 3K is still way too much for a flex conversion, you already have the bits, it'll just be sensor and ecu and tuning. And the sensor is cheap as if you use a genuine GM flex sensor.


So do you think theres no need to replace a VF28 for a VF34?

The only flex fuel sensors ive seen are the haltech and zeitronix ones.

If im going to just e85 what would i need a flex fuel sensor for though??

mv75
WRX STi Driver
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Location: Brisbane Northside.

Re: GC8 WRX E85 or not?

Postby mv75 » Sat Jan 07, 2017 9:33 pm

Doesn't seem to be much difference. I don't have experience with the 28 though. The 34 would spool sooner.

You need the sensor if you went flex fuel. I bought mine here: http://paceperformance.com/i-10801493-1 ... r-e85.html and harness to suit: http://paceperformance.com/i-8396465-13 ... rness.html That's in usd with about another $12 postage. Just pointing out that's how cheap they are. The "branded" ones you see are those exactly with a sticker on them, but they charge like $300 for it. They are all GM sensors made in mexico.

So yea, go injectors and e85 tune. The side feed injectors are an easy change, labour 1 hour max for an experienced shop. Also go a new fuel filter.

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

Postby GRK-90D » Sat Jan 07, 2017 9:43 pm

hmmm ok.. good and bad news i guess. i went ahead and bought a vf34 and PW TMIC after reading up on many forums being told they're a good upgrade from what i have. now questioning whether its worth putting them in or not and trying to return/sell them.

really? thats interesting, thanks for that ill look into them.

what work have you got done to your gc8?

from what i've read, vf28s can handle up to 240kw and spool about 200-500rpm sooner than a vf34

if i can get 220kw atw with my sti tmic and vf28 as well with the injectors and e85 then ill have shot myself in the foot!

mv75
WRX STi Driver
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Location: Brisbane Northside.

Re: GC8 WRX E85 or not?

Postby mv75 » Sun Jan 08, 2017 6:57 am

Don't have the gc8 anymore, moved on to a 2003 peanut with a 2.5 sti shortblock, td06sl2, pw top mount and flex with an eculabs modified ecu. :) But when I did have the gc8, power mods were eculabs ecu, flex, silicone intake, vf34, pw top mount, 3 port boost solenoid, tcp stainless turbo back. Stock wrx block and heads. It was slow on the low, but when it started to get up, it got up hard. :)

I'd like to give info between those turbos, I just have not had any experience with the vf28.

Brett82
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Re: GC8 WRX E85 or not?

Postby Brett82 » Tue Jan 24, 2017 4:17 pm

How much did you make with the vf34 on e85? I have basically the exact same set up on my sti and am thinking about swapping over to e85 but curious on what to expect?

mv75
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Location: Brisbane Northside.

Re: GC8 WRX E85 or not?

Postby mv75 » Wed Jan 25, 2017 8:17 am

Can't give a number. But if you've ever driven in the cold and noticed the huge power increase, it's like that all the time.

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