Mods that i need when upgrading turbo - Page 2 - Subaru WRX Forum
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post #16 of 33 Old 08-01-2008, 12:15 AM
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Originally Posted by wrxman420 View Post
mmmmmmmm...... a hydra

A vf39 will not offer a whole lot more than your stocker. If you don't want a lot of turbo lag get it. But me personally, I would step up to at least a 16g.
Sorry bud but if you are refering to a small 16g the vf39 actually puts down a little more power. If your talking big 16g then it puts down more power than a vf39. Go to Nasioc and search proven power braggin people are puttin down 300whp with vf39.
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post #17 of 33 Old 08-01-2008, 12:22 AM
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I disagree with that. Even a standard 16G has more top end than the VF39

04 STi 16G powered lagless fun
04 WRX: SOLD
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post #18 of 33 Old 08-01-2008, 12:53 AM
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My friend and I have both of them. Both cars are identical in mods except down pipes and turbo's. Tuned by the same shop and he ended up with 20whp more but I had him on the torque by 12ftlbs. Not arguing with you at all Mosc just real world situation I've seen. Also depends on the tuner I guess.

P.S. I was wrong he does have a Cobb tuner as well and I have a Utec. Don't know if that makes a 20hp different but it might.
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post #19 of 33 Old 08-01-2008, 01:55 AM
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I have a 16G in my car and it put down more numbers than a stage 2 STi (basically one with a VF39) so, a "real world example" right there

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post #20 of 33 Old 11-11-2008, 03:15 PM
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was searching around for jus this subject..

im gettin bigger turbo and have pretty much everything i think i need, but wanna make sure.

i have: turbo(fp green)
fmic
fuel pump and injectors, not sure what size, maybe 750's
dyno time scheduled
up pipe for ewg, and 38mm, not sure on spring rate yet tho
perrin boost control solenoid
turbo inlet pipe and intake

am i going to need any random nuts and bolts?
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post #21 of 33 Old 11-11-2008, 03:20 PM
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It's hard to tell from your list. I'm worried that your EWG setup might be designed for a rotated mount where your turbo is not (although they make greens both ways). If you're going EWG, I'd go rotated mount while you're at it. BTW I'd be looking more in the 800+cc injector range for a green turbo

of course you'll also need a good turbo back exhaust and a good tune.

Also, I think the green is too laggy for the EJ205 but whatever, you seem sold on it. Just remember to kiss your <4k RPM torque goodbye for me.

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post #22 of 33 Old 11-13-2008, 08:11 PM
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I totally agree with Mosc about the injectors. They will be the limiting factor when tuning that car.
WRX Fuel injector sizing guide STi Fuel injector sizing guide Lgt fuel injector sizing guide, JSC Speed
That link even suggests at least 800cc injectoers, just backing up some claims.

Joshua
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Stage 2 2005 WRX
Cobbtuning.com"
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post #23 of 33 Old 11-13-2008, 10:30 PM
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can someone go too big on injectors?
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post #24 of 33 Old 11-13-2008, 11:07 PM
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Quote:
Originally Posted by christommy View Post
can someone go too big on injectors?
If your injectors are too big it can be harder to tune and cause idle problems. With that being said, I am running 860cc's which are too big for my 18g, but it idles fine.
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post #25 of 33 Old 11-14-2008, 11:39 AM
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Too big an injector means you're wasting fuel at idle/casual driving and if it's too big for the motor (probably in the 1000cc+ range for the EJ205), you're dumping so much fuel in there at minimum that it can cause rough idle.

Basically you don't want to just throw huge things in there for no reason because it will hurt your fuel economy. The minimum is raised as well as the maximum. There are some long term implications to running rich all the time but that should be kept mostly in check by a good tune.

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post #26 of 33 Old 11-14-2008, 06:24 PM
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Mosc: do you think it would be worth the hassle to get something like 750cc's for my setup (18g, ewg, meth, etc.)? I know I have a lot of headroom with my injectors (860cc), but I didn't think it would be a problem until now.
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post #27 of 33 Old 11-15-2008, 10:07 AM
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Have you talked to a tuner about your setup/tune yet? What do they say? Im sure that the 860s should be fine.

Joshua
"2007 WRX- PPG'd, 20G- Tim Bailey tuned
Stage 2 2005 WRX
Cobbtuning.com"
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post #28 of 33 Old 11-15-2008, 11:25 AM
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Quote:
Originally Posted by WReXd View Post
Mosc: do you think it would be worth the hassle to get something like 750cc's for my setup (18g, ewg, meth, etc.)? I know I have a lot of headroom with my injectors (860cc), but I didn't think it would be a problem until now.
I don't think it would limit with 750cc but I guess it matters how hard you intend to push it. 860cc would certainly not limit you. They're not going to do any harm if they're tuned for. I'd probably go a little bigger than you think you will need unless there was a large cost difference.

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post #29 of 33 Old 11-16-2008, 12:51 AM
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I thought so/hoped so. I did give a list of all my mods to my future tuner, and he didn't mention anything about the injectors being too big. I was just worried because I've been getting REALLY bad gas mileage, which I've been blaming on the generic tune I'm using temporarily. But after mosc's post I began thinking it could be the injectors...
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post #30 of 33 Old 11-16-2008, 02:38 AM
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no, definately a generic tune is going to give shit gas miledge, espectially if the injectors aren't scaled correctly.

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