Which turbo is next!!??
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Which turbo is next!!??
Ok guys, time to upgrade the stock turbo in my 2004 Rex. I have a little dilemma and i was hoping so one could guide me in the right direction. I am stuck between getting the vf-34 and the vf-39 i hear that both are very similar, put up the same numbers, and are both reliable. To my knowledge, the only difference between the two is that vf-34 is ball bearing, and that you can boost the 34 alot higher. My buddy is willing to sell me his used vf-39(50 miles) for $200-very cheap.... but he is also willing to sell me a brand new vf-34 for 500..... I have been searching for weeks on which turbo is better and cant find anything. someone please help me so i can throw this turbo in, and start beating my brothers RX-7!!! (yes and my cuz has an sti-it is tough living in my family)! thanks alot guys
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Car Info: MMVI AW WRX STI
I agree with what has been said. I say get both at that price. 
This is all anecdotal...but I think the 39 has a smaller exhaust side (making for faster spool up and reduced efficiency on the top end).
This is all anecdotal...but I think the 39 has a smaller exhaust side (making for faster spool up and reduced efficiency on the top end).
Between the 2, I'd say get the cheaper one because it's all about the tuning. TurboXS just finished tuning a 39 with the regular STage 4 goodies to 341whp on race gas. This actually edges out 30/34's in the race gas department. So to essentially I'm sure there is a minimal difference in spoolup time (very few hundred RPMs) and as per TXS's numbers, they can perform very similarly.
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Joined: Sep 2003
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i think the VF39 does have a smaller exhaust side than the VF30/34. i think it utilizes a P17 versus the VF30/34's P18 hotside. also, the compressor housing on the 30/34's are a bit bigger if you were to juxtapose them. if you have a 2.0L then the VF30 would be the way to go. however, if you have an STi 2.5L, then just go for the VF22. that would be my decision in any case. 
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Joined: Nov 2003
Posts: 162
From: north bay, CA
You will get a little better spool up with the vf39 but sacrafice a little top end. I prefer the top end and the lag will not be that noticable. I would get both and install the vf34 and then turnaround and sell the vf39 for $300 and make a hundred bucks. $500 is the best price I have ever seen for a vf34.
Originally Posted by wssboard18
You will get a little better spool up with the vf39 but sacrafice a little top end. I prefer the top end and the lag will not be that noticable. I would get both and install the vf34 and then turnaround and sell the vf39 for $300 and make a hundred bucks. $500 is the best price I have ever seen for a vf34.
And it's from this thread on NASIOC: http://forums.nasioc.com/forums/show...highlight=vf39
Originally Posted by JspecGC8
Hold on man that dyno sheet says flywheel graph not wheel graph!!!
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