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Old 11-15-2012, 02:35 PM   #76
VinceCarter
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I think it'd be safe to say you'll need an aftermarket clutch. Especially if you get the larger turbo.
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Old 11-15-2012, 03:15 PM   #77
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The clutch will be fine for just a VF39.
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Old 11-15-2012, 05:54 PM   #78
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What about the 43 and 48? Is the VF39 the most in reliable of the 3 you'd think?
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Old 11-15-2012, 05:58 PM   #79
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Originally Posted by HinshawWRX View Post
The clutch will be fine for just a VF39.
holy ****.....hinshaw is a mod now?

watch out noobs.
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Old 11-15-2012, 06:13 PM   #80
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Lol who cares its a forum where we discuss learn and help others out, not like he's the president of these United States
Again, refer to my post about bickering & there being more important things in life

But when will I be upgraded from scoot newbie? I've been here two years with countless threads and posts....?
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Old 11-15-2012, 06:17 PM   #81
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Lol who cares its a forum where we discuss learn and help others out, not like he's the president of these United States
Again, refer to my post about bickering & there being more important things in life
it was a joke. to him. not you.

Quote:
But when will I be upgraded from scoot newbie? I've been here two years with countless threads and posts....?
its based on post count. you havent posted enough.
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Old 11-15-2012, 06:19 PM   #82
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Quote:
Originally Posted by sc00by4life View Post
holy ****.....hinshaw is a mod now?

watch out noobs.
I love these responses now when I post.

Quote:
Originally Posted by chitownej View Post
Lol who cares its a forum where we discuss learn and help others out, not like he's the president of these United States
Again, refer to my post about bickering & there being more important things in life

But when will I be upgraded from scoot newbie? I've been here two years with countless threads and posts....?
Your user title is all based on post count.

555 = specialist
5000 = guru
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Old 11-15-2012, 06:20 PM   #83
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I'm just saying....and oh okay it's whatever just wondering. Looking around for VF39 or 43 and sti tmic but nobody has any for sale on here! Turbo for >450 shipped and sti tmic >250 shipped none out there in good condition!
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Old 11-15-2012, 06:23 PM   #84
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Originally Posted by NOT_2_SLOW View Post
Why do you think you need a fuel pump? It can be added to the list of items not needed.
Quote:
Originally Posted by HinshawWRX View Post
STI's and WRX's use the same fuel pump. So why would you need one? Answer is, you don't.
I can't believe people are discouraging the OP from getting a new Walbro fuel pump. You guys should know better by now.
Here's what is going on:
- The OP's car has 86K miles, the cylindric/round fuel filter inline with the pump is dirty and needs changing and the pump itself has become tired pushing fuel through a dirty and clogged fuel filter. The sock filter that is plunging into the fuel is also dirty as well.
- So, at the very least, the OP will need to change both the sock filter and the cylindric/round fuel filter but, while he's in there, he should take this opportunity to upgrade the fuel pump as well.
- With a VF39/VF43/VF48, depending on *boost target towards redline* and *depending on target AFR towards redline*, the stock fuel pump will not be able to provide enough fuel !! I repeat it again, depending on boost target and depending on target AFR, the stock fuel pump will not make it.

Let's give a specific example. I'm running 15.5 psi of boost from a VF43 from 5500RPM to 6800 RPM and my target AFR is 10.7:1. Guess what ? The stock fuel pump couldn't do it. I was only getting 10.9:1~11.1:1 AFR at best. My 02 wideband sensor was perfectly calibrated, the stock fuel pump with 40K miles on the clock just couldn't deliver enough fuel.

So, OP, change your fuel filters and UPGRADE that fuel pump while you're in there.
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Old 11-15-2012, 06:29 PM   #85
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Yes on top of the sti tmic and turbo I'm doing fuel pump. I do the fuel filter as preventative maintenance anyways since I always change that when I buy a car!
Thanks
Mike
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Old 11-15-2012, 10:24 PM   #86
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Quote:
Originally Posted by HinshawWRX View Post
The clutch will be fine for just a VF39.
Really? What's the torque capacity on an OEM WRX clutch? Because the torque numbers he is putting up already look like he's entering aftermarket territory.
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Old 11-15-2012, 11:17 PM   #87
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Tuner said he's going to do a winter tune so ill have less torque, around 310/310, but for spring ill be at 320/340ish
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Old 11-16-2012, 01:12 PM   #88
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Quote:
Originally Posted by VinceCarter View Post
Really? What's the torque capacity on an OEM WRX clutch? Because the torque numbers he is putting up already look like he's entering aftermarket territory.
From what I have been told, the stock WRX clutch will hold VF39 torque. The question is for how long. Obviously the clutch will start slipping sooner at 330 WTQ than at 280 WTQ (typical level for Stage 2).

OP, you can keep the stock clutch until it starts to slip. No sense in replacing a clutch that is holding. The question arises when you need to replace it. At that point opinions differ. A new stock clutch will hold the torque and be easiest to drive. You just won't get 90k miles out of it like you could at stock torque levels, and clutch jobs are expensive.

An aftermarket "Stage 1" clutch (like those from ACT or Exedy) will hold the torque and theoretically last longer. But the pedal will be heavier, and they can chatter. I personally went with an Exedy Stage 1 street clutch and a stock flywheel. It engages smoothly and is easy to drive. But the pedal is heavier and I hear a grinding noise at about 2200-2400 RPM under heavy acceleration. Under normal acceleration it is quiet.

Long story short, stick with the stock clutch for now and do research when it comes time to replace it. If you do go upgraded, don't go heavier than "Stage 1". My $.02, not the Bible.
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Old 11-16-2012, 02:28 PM   #89
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Quote:
Originally Posted by neg_matnik View Post
I can't believe people are discouraging the OP from getting a new Walbro fuel pump. You guys should know better by now.
Here's what is going on:
- The OP's car has 86K miles, the cylindric/round fuel filter inline with the pump is dirty and needs changing and the pump itself has become tired pushing fuel through a dirty and clogged fuel filter. The sock filter that is plunging into the fuel is also dirty as well.
- So, at the very least, the OP will need to change both the sock filter and the cylindric/round fuel filter but, while he's in there, he should take this opportunity to upgrade the fuel pump as well.
- With a VF39/VF43/VF48, depending on *boost target towards redline* and *depending on target AFR towards redline*, the stock fuel pump will not be able to provide enough fuel !! I repeat it again, depending on boost target and depending on target AFR, the stock fuel pump will not make it.

Let's give a specific example. I'm running 15.5 psi of boost from a VF43 from 5500RPM to 6800 RPM and my target AFR is 10.7:1. Guess what ? The stock fuel pump couldn't do it. I was only getting 10.9:1~11.1:1 AFR at best. My 02 wideband sensor was perfectly calibrated, the stock fuel pump with 40K miles on the clock just couldn't deliver enough fuel.

So, OP, change your fuel filters and UPGRADE that fuel pump while you're in there.
Sorry but the OP asked what supporting mods are needed, and a fuel pump is NOT needed. The stock fuel pump is more than capable of suppling the propper fuel pressure to the stock injectors. i run a 10.7:1~11.1:1 afr @ 19.5psi and run my injectors @85-96% IDC on stock injectors and stock fuel pump no problem with 40k more miles on the clock.

Last edited by NOT_2_SLOW; 11-16-2012 at 03:03 PM.
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Old 11-16-2012, 02:58 PM   #90
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Quote:
Originally Posted by NOT_2_SLOW View Post
Sorry but the OP asked what supporting mods are needed, and a fuel pump is NOT needed. The stock fuel pump is more than capable of suppling the fuel flowing to the stock injectors running 96% IDC. i run a 10.7:1~11.1:1 afr @ 19.5psi and run my injectors @85-96% IDC on stock injectors and stock fuel pump no problem with 40k more miles
The only thing that matters is your amount of boost at redline and your AFR target at redline. You're not running 19.5 psi at redline; that's your boost target in the midrange. And, most likely, you're not running 10.7:1 AFR at redline either.
Again, the only thing that matters is AFR target at redline and boost target at redline because that's what is going to define the maximum amount of fuel required by the engine. With 15.5 psi at redline and a target of 10.7:1, my IDCs are well into the 90% range with a Walbro.
Without the Walbro, IDCs were flirting with 100% and AFR target of 10.7:1 was not reached.

EDIT: I wish people would also mention boost target towards redline as mentioning the maximum amount of boost in the midrange does not say much...

Last edited by neg_matnik; 11-16-2012 at 03:04 PM.
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Old 11-17-2012, 04:08 AM   #91
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How do you guys feel about headers w/ uppipe? Actually debating on whether on installing them or just selling them (they are UEL) because they did put a hole in my wallet. People are all for modding to Grimmspeed port & polish manifold w/ crosspipe and uppipe and saying it makes a difference but buying aftermarket headers w/ uppipe makes no difference. Also, I always thought that porting would make you lose spool too.
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Old 11-18-2012, 07:15 PM   #92
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The stock fuel pump is fine, I'm replacing it as a precautionary measure since it seems to be the general consensus. I don't plan on upgrading further than VF and tmic so it should be fine. My clutch is perfect now, even after 30-40 pulls since I've bought it! Ill go stage 1 clutch after it starts slipping, no point to replace it until then though yes!
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Old 12-05-2012, 02:20 PM   #93
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How will 5 speed trans and diff hold up with 320whp 340wtq? Give or take and what's safe? And will an hks bov hold 20psi?
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Old 12-05-2012, 02:50 PM   #94
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We cannot answer that question, FAR too many variables.
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Old 12-05-2012, 07:20 PM   #95
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Assuming I never launch or red line it besides maybe once a month. A Wrx with 88k miles running strong with 240whp and 320wtq, somebody can from personal experience having the VF setup on a Wrx with stock trans and diff...
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Old 12-05-2012, 07:30 PM   #96
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They break on stock power. Nobody really knows how long it will hold. It could blow on the first pull or could hold for 5 years.
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Old 12-05-2012, 07:30 PM   #97
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No, there are simply FAR too many variables to say. Will it last? Probably. Will it fail? There is a chance. Lot's of people have a similar setup to yours on their WRX's and don't have problems, others do. The question you are asking simply cannot be answered with full honesty. If you are simply looking for a number, 20 years.

Edit: Forgot to mention the whole "glass transmission" argument is a lie. These are essentially the same transmissions that have been used by Subaru for nearly 20 years in Japan and make equal or more power when modded. My 18G and trans have done just fine, and I can beat on it pretty good. You'll hear more of ringland failures then trans failures.
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Old 12-05-2012, 07:42 PM   #98
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^This.

07 WRX Wagon, 64k miles
Stock trans. - gears, clutch, flywheel.
VF43, DW 750cc injectors, STi tmic, Invidia catless 3" exhaust, Cobb Tuning SF itake, tuned by Sean Ivey. Made 321awhp / 343awtq @ 21psi.

Clutch slips in 4th at WOT in low RPMs. Otherwise it's fine. If you're going to be on a stock 5 speed, don't shift much below 2,500 RPMs. Lower RPMs = more load on your clutch / trans = shorter life span. Barring 6,500 RPM dumps, no-lift shifts, and other completely unnecessary driving habits on the street, the stock drivetrain will handle the power no problem.

EDIT: looked at the dyno sheet again, max boost was 21psi.

Last edited by scoobasaurusrex; 12-05-2012 at 07:52 PM.
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Old 12-05-2012, 08:28 PM   #99
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^^^ thanks! And no problem with fuel pump? I was thinking vf39, sti tmic, fuel pump and tune
With the and sr intake already installed! Can't WAIT to boost hard that's a lot of power for a 20 yr old haha
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Old 12-05-2012, 10:17 PM   #100
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Originally Posted by chitownej View Post
^^^ thanks! And no problem with fuel pump? I was thinking vf39, sti tmic, fuel pump and tune
With the and sr intake already installed! Can't WAIT to boost hard that's a lot of power for a 20 yr old haha
No, stock fuel pump will be fine. Anything beyond that you'll want to go bigger

And yeah you think that's fast... Try having a liter bike as a 20 year old
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