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Old 04-01-2013, 08:09 PM   #51
neg_matnik
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A lot of people will tell you that you don't need a fuel pump with a VF39/VF43/VF48; however, listen to your tuner as he's the one who is going to actually dial in AFR target and boost target towards redline.
My experience with my own car showed me that the stock pump is right at the limit of what the VF turbos can do at redline. I moved to a 255lph Walbro to maintain some safety margin.
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Old 04-01-2013, 08:20 PM   #52
breezeby
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I agree get with your tuner before changing anything as hey can assist with matching what upgrades to other for higher numbers
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Old 04-01-2013, 09:55 PM   #53
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Quote:
Originally Posted by coalslaw View Post
re-edit
how much is it puttin down now
Well I ended up getting 1100cc FIC injectors and am going to be switching to e85 soon. but the tuner seems to think I am around 320 to the wheels on 91. torque IDK but he said I will see close to another 30 or 40 ft lbs on e85. cant wait for that. But I think my tranny wont look at it like that. Heres a pic of my engine bay. Somthing for the OP to look at for future upgrades. I do all my own powder coating so....

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Old 04-01-2013, 10:21 PM   #54
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from what I know, you don't need a fuel pump for the vf's. That being said, tuners may reccomend them...and at $100...and very little work, it's not a bad idea.

I've been talking to Clark Turner as I slowly get ready to upgrade my 06 WRX. I told him the mileage already on the car, the basic route I want to take and so forth.

He came back recommending I do a fuel pump (he said basically what I just said), Cobb SF Intake + Airbox, a better recirc valve, NGK spark plugs.

I already have a Perrin downpipe, STi TMIC/Splitter and a Cobb AP laying around. So I obviously don't need those.

All of this was suggested to me with the plans to possibly go to a reliable stage 3 as the car is my DD.

TLDR; find a tuner you're going to work with and get their suggestions. Not ours.
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Old 04-01-2013, 11:02 PM   #55
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Will do
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Old 04-02-2013, 09:31 AM   #56
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You can get a fair amount of power with the littel TD04

http://forums.nasioc.com/forums/show....php?t=1866238
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Old 04-02-2013, 12:29 PM   #57
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He's making about 15 more HP than me on the Cobb stage 2 map but enough torque to take out the trans on the lil Td04. Not sure if that's enough power that id feel the difference plus enough to justify spending tons of cash on a tmic when I could get a whole new setup for cheaper.

Thinking I want a 16g but which one? I'm looking for 300 or so awhp
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Old 04-02-2013, 06:34 PM   #58
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td06 8cm 20g. 300whp all day long on pump gas. TQ hits a little higher in the rev range so it's safer for the transmission. And it won't drop off in the higher rpms like a vf turbo.
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Old 04-02-2013, 09:33 PM   #59
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^vf48 is the same as the 39 for the most part supposedly a larger turbine housing but its probably too small to notice. I have an 07 wrx with a vf48 im on stock injectors with a 255 fp but i hope to run a 18g at some given point in time. looking back with what i know now id get an 18g xt but thats just my opinion.
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Old 04-02-2013, 09:40 PM   #60
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What 16g would you all suggest feel like anything bigger is too much for my current trans
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Old 04-02-2013, 10:12 PM   #61
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Originally Posted by URABUS07WRX View Post
^vf48 is the same as the 39 for the most part supposedly a larger turbine housing but its probably too small to notice. I have an 07 wrx with a vf48 im on stock injectors with a 255 fp but i hope to run a 18g at some given point in time. looking back with what i know now id get an 18g xt but thats just my opinion.
What numbers did you put down?
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Old 04-03-2013, 01:40 AM   #62
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What 16g would you all suggest feel like anything bigger is too much for my current trans
Conventional wisdom states that a bigger turbo will help the trans in terms of everyday abuse because the tq hits later. Reality is that larger turbos have been known to sheer gears. However, that was in the 02-03's in particular. I still say go 20g td06 8cm (or 10cm). The larger exhaust housing will provide better flow for the 2.5L, better response and similar spool as a smaller hotside. It's simply more efficient for the 2.5L (there are numerous threads discussing this from back in the day). Smaller isn't always better...
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Old 04-03-2013, 10:26 AM   #63
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Got cha that makes sense. Any other views on this?
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Old 04-03-2013, 10:51 AM   #64
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I was in the same boat about 2 years ago in wanting more power. I went from TD04 to VF43 to now a Blouch TD06-20GXT. I was definitely happy with the difference that the VF43 made compared to the TD04. In hindsight, I did feel that the topend still lacked some punch. I didn't really know what it meant to have a high HP car. The torque relatively stayed the same but the HP numbers went from 230 to 305 to 330ish. Those are estimates, can't really remember the exact figures. The biggest eye-opener with the 20G is when you get up there in RPMs and feel the power still going strong all the way to redline.

So I'm trying to make 2 points here. IMO, I think you will be better off upgrading to a turbo better than the VF series if what you want out of your car is anything similar to what I wanted. It will cost more money up front but I feel it will save you in the long run when eventually you'll want more.

My second point is that if you really are concerned about your tranny, I would just stick with the TD04 now until you have the funds to do a bigger turbo upgrade (and everything else your tuner will say you need to support it) and a 6-speed swap. I understand that there are plenty of people out there with VF turbos or bigger and still on the stock 5-speed - kudos to them - but I'm sure you've read enough of these forums where you 'pay to play'. The 5-speed can crap out on you the day of your tune with your new turbo or years down the line - it really is a crapshoot of when it will happen. It has happened to me and fortunately I had the time and money to put a 6-speed in it.
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Old 04-03-2013, 10:54 AM   #65
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Running a 39 on stock injectors, $75 255 for insurance. STOCK intake (be prepared to have scaling issues if you change it) Catless DP blah blah blah. And a slightly tweaked airboy base map which I need to finish once classes are over.

Romraider virtual dyno ~330tq/310hp

Pulls harder than my previous stock 07 sti, which is expected.

I just have to hop in thr GF's stock 07 rex to have a reality check, huge difference.
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Old 04-03-2013, 10:32 PM   #66
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Haven't been had the car on the dyno but it pulls nicely. would like more up top but i guess when is there ever enough hp

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What numbers did you put down?
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Old 04-04-2013, 06:56 AM   #67
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Originally Posted by kenliu84 View Post
I was in the same boat about 2 years ago in wanting more power. I went from TD04 to VF43 to now a Blouch TD06-20GXT. I was definitely happy with the difference that the VF43 made compared to the TD04. In hindsight, I did feel that the topend still lacked some punch. I didn't really know what it meant to have a high HP car. The torque relatively stayed the same but the HP numbers went from 230 to 305 to 330ish. Those are estimates, can't really remember the exact figures. The biggest eye-opener with the 20G is when you get up there in RPMs and feel the power still going strong all the way to redline.

So I'm trying to make 2 points here. IMO, I think you will be better off upgrading to a turbo better than the VF series if what you want out of your car is anything similar to what I wanted. It will cost more money up front but I feel it will save you in the long run when eventually you'll want more.

My second point is that if you really are concerned about your tranny, I would just stick with the TD04 now until you have the funds to do a bigger turbo upgrade (and everything else your tuner will say you need to support it) and a 6-speed swap. I understand that there are plenty of people out there with VF turbos or bigger and still on the stock 5-speed - kudos to them - but I'm sure you've read enough of these forums where you 'pay to play'. The 5-speed can crap out on you the day of your tune with your new turbo or years down the line - it really is a crapshoot of when it will happen. It has happened to me and fortunately I had the time and money to put a 6-speed in it.
Well if he saves up and goes straight to the 20G then he will want something even bigger about 3 years or less down the road.

Plus is it hard to do the 6-speed swap as i have been wanting to do it for a while now


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Haven't been had the car on the dyno but it pulls nicely. would like more up top but i guess when is there ever enough hp
Well that's good let me know if you ever hit up a dyno as i am interested in the difference in the vf39 and 43 or 48. I know there is a little bit of difference i just wonder how much. I think i am going to save up for an 18G and 6-speed swap and injectors which is the other part that makes it expensive to upgrade to a big turbo
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Old 04-04-2013, 07:27 AM   #68
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That's why I prefaced my thoughts by stating if his goals are anything similar to mine. If they are - a reliable, 300 hp (good top end) DD - then I think he will be happy with the 20G or anything similar.

Swapping to the 6 speed isn't hard but I guess it depends on what you mean by that. Depends on how much time you have to look up parts as well as time to install everything. Plus whether or not you are mechanically inclined.
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Old 04-04-2013, 10:29 AM   #69
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If a vf39 with the Cobb stage 3 map is a noticeable improvement over the stage 2 tune I will probably go that route until I save the coin for a 6spd swap or ppgs. If not I'm sure a vf43 or 16g with a pro tune will make me happy. I can't see a 20g that makes much more HP being easier on my trans
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Old 04-04-2013, 08:54 PM   #70
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I suggest that you let the car breathe, as an owner of an 07 rex. I had an SPT intake and cat-back exhaust that added about 45 whp when I tuned it. It made a difference.
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Old 04-04-2013, 09:34 PM   #71
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He will feel a big difference when he uses the vf39 or 43 because it will feel like it never stops pulling compared to the TD04
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Old 04-06-2013, 12:26 PM   #72
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stock airbox is good till 3xx hp power. correct me if im wrong...cat back doesnt get you any gains

Last edited by coalslaw; 04-06-2013 at 05:19 PM.
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Old 04-07-2013, 02:44 AM   #73
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is there a final say on the necessity of a fuel pump for a VF turbo?
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Old 04-07-2013, 08:37 AM   #74
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I would say yes as my tuner told me to do it for safety
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Old 04-07-2013, 10:46 AM   #75
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Quote:
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is there a final say on the necessity of a fuel pump for a VF turbo?
From what I have been told, you don't need to upgrade on an 06/07. BUT, for the $80-90 and short amount of time, it is worth it to ensure you're not starved for fuel.
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