vf34?

[wade869]

i have an 02 wrx and i just bought an sti intercooler. i want to upgrade my turbo, but i am not sure what turbo size to buy. but i want 300 hp at the wheel. would a vf34 be fine? BUT in the furture i plan to swap out my wrx trans and motor to the 6 speed and 2.5 sti features. so any suggestions? i was also thinking an 18 or 20g.

[redwrxwagon02]

18g's are nice turbos for these cars 20g's from what i have heard spool a little late on the ej20 i myself run the vf34 and prduced 302.3 whp and 285 torque at 21.4 psi so really it all comes down to you, you can also produce the same numbers that i did on an fp16g or an evo III big 16g but i love my vf34 and besides it is ball bearing

[Uberu]

I also have a VF34 and like it a lot. Keith (Buster) just put in his 16g and he loves that.

Remember once you do a turbo, you'll need EM, injectors and fuel pump to atleast run correctly.

If you had plans on swapping everything out I wouldn't do a bigger turbo now I would wait. Get a 2.5 bottom end and heads and then start from there.

[redwrxwagon02]

^true i didnt catch the 2.5 swap lol i suck but yeah if your planning on doin a 2.5 swap in the future start building now and when your ej20 kicks the bucket throw in the 2.5 and please for the love of god when you swap out the 2.5 get rotated and a 35r lol

[Jeffros Spec V]

Originally Posted by redwrxwagon02

and please for the love of god when you swap out the 2.5 get rotated and a 35r lol

$$$$$$$$$$$$$$$$$

[Renegade_]

another turbo you could consider are the older WRX/STi RA turbos, the VF22/23. 23 is ball bearing (22 isnt) and both have a higher outputs than the VF34. 23 shares the same P20 exhaust housing of the VF22 (the largest VF series turbo) but has a smaller coldside for faster spool (not by too much but enough) and is BB. However, 22 just has more top end and still has some room to go once you hit 300whp, on nasioc people are hitting 320-330 with vf22 and spool should be somewhere around 3800 up to maybe 4000 with a fmic

[Buster]

Get ready to re learn your car though. i almost pulled my turbo back out because it took forever to adapt to it. 300 is a good number to shoot for but you will have to tune fairly aggressively to get it. 275-290 is a little easier to come by.

[WKderF]

I have a VF-34 & was able to hit 300Whp.

check out this thread for the info:

http://www.tristatetuners.com/forum/...ad.php?t=35159

[wade869]

thanks guys for all your advice. i will consider it all. what do you guys recomend on types of new injecters, and other stuff that i have to do along w. a bigger turbo. now also am i going ot have a bg difference in turbo lag? i love to hear people when they sputter thru thier intake. so i am also shooting for that sound. haha. also... am i am going to be maxed out w. my 2.0 on 300hp b/c instead of swapping out my 2.0 for 2.5 i just might do whatever i can to the 2.0?

i also want to get as much tourqe out as i can. hopefully matching the hp or higher. (not lower then hp, or isn't that possible?)

Also a side note... i just put on my 4 in. hood scoop 04+ style. i love it!

[wade869]

Originally Posted by Renegade_

another turbo you could consider are the older WRX/STi RA turbos, the VF22/23. 23 is ball bearing (22 isnt) and both have a higher outputs than the VF34. 23 shares the same P20 exhaust housing of the VF22 (the largest VF series turbo) but has a smaller coldside for faster spool (not by too much but enough) and is BB. However, 22 just has more top end and still has some room to go once you hit 300whp, on nasioc people are hitting 320-330 with vf22 and spool should be somewhere around 3800 up to maybe 4000 with a fmic

renegade....... now since they put out higher out puts. will they spool up quicker. and they seem to be smaller then the vf34. or am i wrong?

[wade869]

Originally Posted by redwrxwagon02

^true i didnt catch the 2.5 swap lol i suck but yeah if your planning on doin a 2.5 swap in the future start building now and when your ej20 kicks the bucket throw in the 2.5 and please for the love of god when you swap out the 2.5 get rotated and a 35r lol

redwrxwagon02...... why do you recomend a rotated?

[wade869]

Originally Posted by SGMsubI

I also have a VF34 and like it a lot. Keith (Buster) just put in his 16g and he loves that.

Remember once you do a turbo, you'll need EM, injectors and fuel pump to atleast run correctly.

If you had plans on swapping everything out I wouldn't do a bigger turbo now I would wait. Get a 2.5 bottom end and heads and then start from there.

SGMsubi...... what kind of numbers do you put out? and what do you have to get those numbers if you dont mind me asking?

[TROLL]

that little button with the " and + on it is a 'multiquote' tool... click on each you want to quote then on the last one hit the button that says "quote" on it... its pretty neat.

and its nearly impossible to have as much torque as hp on a 2.0L, especially if you're going ot have near 300 whp. if you want torque, you gotta do the 2.5L, no doubt about it.

[Renegade_]

Originally Posted by wade869

renegade....... now since they put out higher out puts. will they spool up quicker. and they seem to be smaller then the vf34. or am i wrong?

VF22's and VF23's hotside are both larger than the VF34's, but the coldside is where it differs. The VF23 is a ball bearing turbo and it will spool pretty quick and it has the ability to put you above the 300whp mark. VF34 will get you to 300 whp but thats where it is basically maxed out. You might be able to eek out some more HP with meth injection, etc.

Not saying the 23 will take you beyond that all that far, but there are examples of a VF23 on a jdm motor cranking out like 320 at the wheels. The VF22 will take you to over 300whp without maxing out but it is not ball bearing like the 23 and 34s so spool is sacrificed.

http://forums.nasioc.com/forums/show....php?t=1141476

So you don't have to search through that....

VF22 - (490cfm at 18.0psi, 250-325whp, Bolt-On)
This is the standard equipment turbocharger used on the JDM V3 Subaru Impreza WRX and optional on the JDM Subaru Impreza WRX STi 22b. Of all the IHI models, the VF22 has the largest potential for peak horsepower, and is capable of supporting the highest boost levels. It is capable of running up to 25 psi. The VF22 is a roller bearing turbo that utilizes the P20 exhaust housing.
Expect to achieve full boost with the proper mods and a quality tune between 3200-3700rpms.

VF23 - (388cfm at 18.0psi, 250-325whp, Bolt-On)
This is the standard equipment turbocharger used on the JDM Subaru Impreza WRX STi 22b. The VF23 is a ball bearing turbocharger that utilizes the P20 exhaust housing like the VF22. This housing is mated with the smaller compressor housing of the VF24 for fast response and excellent low and mid-range performance. It does not have the same top end power of the VF22, but spools up slightly quicker.
Expect to achieve full boost with the proper mods and a quality tune between 2800-3300rpms.

VF34 - (460cfm at 18psi, 250-325whp, Bolt-On)
This is the standard equipment turbocharger used on the JDM V7 Subaru Impreza WRX STi Spec-C. The VF34 is nearly identical to the VF30 but has improved spool up due to its roller bearing design. It also utilizes a P18 exhaust housing.
Expect to achieve full boost with the proper mods and a quality tune between 3000-3500rpms.

[wade869]

thanks troll and renegade. by the way. i love your 2.5rs renegade. i wish i had that generation. they are sweet looking. would you say 200 for an 05 sti intercooler is a good deal? i met a guy at ceceil and offered him 200 without searching prices. so hope i didn't screw myself. haha