320-330 bhp mate with around 300-320 torque,will feel pretty rapid in a classic

 

i agree,although with a good vf34 the op may fetch a little more power.

 

Didn't want to say more as most fall short over 330 although mine pulled 354/341 at 1.45 bar

 

Thanks for reply was hoping might make abit more rough 340/350bhp or is it poss with 550cc injecters as had a newage before this v8 sti with supporting mods and that was quick hoping this will be quicker

 

Look for 330 and anything after is bonus,it will defo be quicker than your ver8 due to less weight in a classic

 

the vf34 is a good turbo and spools well,and should with a bit of luck see 330,thats always the problem with modifying,always expecting more than you actually get.

 

well as long as it is quick till i can afford a better turbo injectors and a must brakes then a case of what gives up first box or block

 

Very true,it's not the figure but how it drives that counts

 

+1 for the above ,330bhp in a classic compared to 350 bhp in a newage should not be much difference imho, as the newage is 80+ kgs heavier.

 

Question being, why change from a vf28 to a vf34? There will be little gain if any, my v5 type r is running 320-330 on the std tmic.

 

You may want to consider having FPR and you can see more power. My car made 366.1bhp on 440cc, (i have a different turbo) with FPR, it certainly helps squeezing a little more power of the injectors.

 

Hi there was told a vf34 was a better turbo than the vf28 for power ?like i say am new to modding subarus all the ones before were as i bought but now i know ask for advice on here as its top

 

34 is better than 28 but only marginal mate

 

I have blob wrx and i made 301hp on td04 with suporting mods.
Hoping to get hold of a good vf34 and make 340-350hp with the addition to fit sti tmic, pinks. Is it easily possible?

 

Throw in some meth and you'll gain a few more horses, although the fuelling may need beefing up.

 

Eminently possible.
Here's some turbo comparisons.

The IHI VF-34 Turbo is found on the limited production Subaru v7 WRX STI-RA (GDB). This turbo is differentiated from the VF30 through it's more advanced bearing design. The bearing design allows for much quicker turbo spool-up (depending on tuning, 300-500+ RPMs over the VF30), while retaining the power capabilities of the VF30. The VF34 is capable of 350+ HP (~300+whp) This turbo is a direct bolt-on for all GC8, GDA, GDB EJ20 turbo engines. This is an excellent replacement turbo for those looking for substantial power gains while maintaining streetability



Compiled by Hotrod on NASIOC:

Last updated 12/28/02
Turbo Type ----------- Approx flow @ pressure
Stock Turbo ---------- 360 CFM at 14.7 PSI
IHI VF 25 ------------- 370 CFM at 14.7 PSI <--- estimated
IHI VF 26 ------------- 390 CFM at 14.7 PSI <--- estimated
T3 60 trim ----------- 400 CFM at 14.7 PSI
IHI VF 27 ------------- 400 CFM at 14.7 PSI <--- estimated
IHI VF 24/28/29 ----- 410 CFM at 14.7 PSI <--- estimated

========= 422 CFM max flow for a 2 Liter at .85 VE pressure ratio 2.0 (14.7 PSI) 7000 RPM =======

IHI VF 23 ------------- 423 CFM at 14.7 PSI
FP STOCK HYBRID -- 430 CFM at 14.7 PSI <--- derived from HP potential listed on web
IHI VF-30 ------------- 435 CFM at 14.7 PSI <--- estimated
SR 30 ----------------- 435 CFM at 14.7 PSI
IHI VF-22 ------------ 440 CFM at 14.7 PSI <--- refigured
T04E 40 trim -------- 460 CFM at 14.7 PSI

========= 464 CFM max flow for a 2.2 Liter at .85 VE pressure ratio 2.0 (14.7 PSI) 7000 rpm =======

PE1818 -------------- 490 CFM at 14.7 PSI <--- estimated from max flow numbers
Small 16G ------------ 505 CFM at 14.7 PSI
ION Spec (stg 0) --- 525 CFM at 14.7 PSI <--- per vendor post 12-27-2002

========= 526 CFM max flow for a 2.5 Liter at .85 VE pressure ratio 2.0 (14.7 PSI) 7000 RPM =======

Large 16G ----------- 550 CFM at 14.7 PSI
SR 40 ----------------- 595 CFM at 14.7 PSI
18G ------------------- 600 CFM at 14.7 PSI
PE 1820 -------------- 630 CFM at 14.7 PSI <--- estimated from max flow numbers
20G ------------------ 650 CFM at 14.7 PSI
SR 50 ---------------- 710 CFM at 14.7 PSI
GT-30 ---------------- 725 CFM at 14.7 PSI
60-1 ----------------- 725 CFM at 14.7 PSI
GT-35R -------------- 820 CFM at 14.7 PSI
T72 ------------------ 920 CFM at 14.7 PSI <--- Note you would have to spin a 2.0 L engine at about 14,000 rpm to flow this much air.

IHI VF 25 ----------- 395 CFM at 18 PSI <--- estimated
IHI VF 26 ----------- 400 CFM at 18 PSI <--- estimated
T3 60 trim ---------- 410 CFM at 20 PSI
IHI VF 27 ----------- 420 CFM at 18 PSI <--- estimated
IHI VF 24/28/29 -- 425 CFM at 18 PSI <--- estimated
IHI VF 23 ----------- 430 CFM at 18 PSI <--- estimated
IHI VF-30 ----------- 460 CFM at 18.0 PSI <--- estimate based on trap speeds of cars running this turbo
AVO 320HP -------- 465 CFM at 17.5 PSI
T04E 40 trim ------ 465 CFM at 22 PSI
FP STOCK HYBRID- 490 CFM at 18.0 PSI
IHI VF-22 ---------- 490 CFM at 18.0 PSI <--- refigured
SR 30 --------------- 490 CFM at 22 PSI
Small 16G ---------- 490 CFM at 22 PSI
ION Spec (stg 0) - 500 CFM at 19 PSI <--- per vendor post 12-27-2002
PE1818 ------------ 515 CFM at 22 PSI <--- estimated from manufactures rated max power
Large 16G --------- 520 CFM at 22 PSI <--- upgraded flow some on review of compressor map

========= 526 CFM max flow for a 2 Liter at .85 VE pressure ratio 2.5 (22 PSI) 7000 rpm =======

========= 578 CFM max flow for a 2.2 Liter at .85 VE pressure ratio 2.5 (22 PSI) 7000 rpm =======

HKS GT2835 ------- 580 CFM at 22 PSI 400 hp
MRT 400 ------------ 580 CFM at 16 PSI
AVO 400HP -------- 580 CFM at 17.5 PSI
MRT 450 ------------ 650 CFM at 19 PSI
AVO 450HP -------- 650 CFM at 20.0 PSI
SR 40 ---------------- 650 CFM at 22 PSI

========= 658 CFM max flow for a 2.5 Liter at .85 VE pressure ratio 2.5 (22 PSI) 7000 rpm =======

HKS GT3037 ------ 670 CFM at 22 PSI 460 hp
PE 1820 ----------- 680 CFM at 22 PSI <--- estimated from manufactures rated max power
20G ---------------- 695 CFM at 20.0 PSI
HKS GT3040 ----- 710 CFM at 22 PSI 490 hp
AVO 500HP ------ 770 CFM at 22 PSI
SR 50 ------------- 770 CFM at 22 PSI
GT-30 ------------- 790 CFM at 22 PSI
60-1 --------------- 800 CFM at 22 PSI
HKS GT3240 ----- 830 CFM at 22 PSI 570 hp
GT-35R ----------- 880 CFM at 22 PSI
T72 --------------- 1000 CFM at 22 PSI <--- note you would have to run a 2.0 L engine at >40 PSI boost to flow this much air

Conversions used where I had control over conversion factors:
1 HP approx equals 1.45 CFM

1 CFM approx equals 0.0745 lb of air/min

0.108 Lb/min approx equals 1 hp

1 Meter cubed/sec = 35.314 CFS = 2118.867 CFM

1 KG/sec = 132 lbs/min approx equals 1771.812 CFM

power coversions:
1 PS = 0.9859 HP = 75 Kgf m/sec
1.3405 HP = 1 KW
1 HP = 746 watts

 

Not on a car like mine (5sp box), think ill stop at that and leave so car will be reliable and not wanting to blow up etc. until i get my next car!!lol