18g or VF39 - Subaru WRX Forum
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#1 Old 02-27-2008, 01:49 AM
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18g or VF39

Although I've been planning to do a VF39 swap, I recently came across the opportunity to pick up a 18g for a pretty low price. I was reading about the 18g and it seems like a reliable turbo, similar in size to the VF39. And I also see that Cobb makes a map for the 18g that is comparable in hp and torque to their vf39 map. I was curious of what reasons there were why or why not to use the 18g in my setup?
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#2 Old 02-27-2008, 10:06 AM
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there is no reason not to use the 18g, go for it.

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#3 Old 02-27-2008, 11:49 AM
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vf39 is a whole lot smaller than an 18G... it's not fair to call them "similar in size"

ppl use vf39s because they were stock on the 04-06 STis so there are often a lot of used ones around to be had for cheap. That's really the only compelling reason to use that turbo IMHO.

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#4 Old 02-27-2008, 12:25 PM
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I agree with mosc, you're in two different ballparks here. With the 2.5L I'd get the 18G no question about it.

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#5 Old 02-27-2008, 01:19 PM
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plus if i am correct, the vf series turbos are not rebuildable right? IMO 18g better choice as well...

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#6 Old 02-27-2008, 01:20 PM
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Quote:
Originally Posted by SuBeast View Post
plus if i am correct, the vf series turbos are not rebuildable right? IMO 18g better choice as well...
true, but this is a minor point considering that not all turbo failures are rebuildable anyway and the price of the rebuild on such cheap turbos (either one) is not too far from the price of a new one anyway.

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#7 Old 02-27-2008, 02:40 PM
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so ive got a 2.0 and i was thinking about doing a turbo upgrade but im not after anything balls out right now. Would a vf39 be a good option? Would i need new injectors and pump or would the stockers i have be enough?

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#8 Old 02-27-2008, 03:50 PM
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Quote:
Originally Posted by mosc View Post
true, but this is a minor point considering that not all turbo failures are rebuildable anyway and the price of the rebuild on such cheap turbos (either one) is not too far from the price of a new one anyway.
yeah i guess... i didnt know that

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#9 Old 02-27-2008, 04:13 PM
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Adizzle, if you can afford it check out the 16G turbos. Im sure you will be happier with one of them over a vf39. Check out bloucgturbo.com

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#10 Old 02-27-2008, 04:17 PM
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New would i need new injectors and pump with a 16g? Im trying not to swap those out yet but a little more juice would be good.

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#11 Old 02-27-2008, 04:23 PM
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its blouchturbo.com , mistyped but whatever. They have good turbos there. I guess ti dpends on what power gains you want from the 16g. It would definately be nice to get some 650cc's, but i think some STi pinks should be fine if your just trying to get around 300hp... idk, i wouldn't decide anything on what i say bczu half the stuff i say idk if it's true

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#12 Old 02-27-2008, 04:38 PM
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My bad about the spelling. But if you dont want to change your injectors, just modify them instead. Like said, you could probably use the stock ones, but you need the pump, the I/C, if you dont change them really no use in getting something bigger that will be limited on what else you have running it.

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#13 Old 02-27-2008, 04:43 PM
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yesah, if you change turbos you'll want to change intercooler, injectors, pump, and tune (and I'm assuming you have already swapped up/down and maybe intake+catback too)

The stock injectors on the EJ20 are pretty tiny. Some ppl actually get gains with the stocker still there (especially if P&Ped) out of just fuel mods. The stock fuel pump is not going to flow anything larger either so it has to go.

VF39 is a cheap option for turbo swap which is why it's popular. Get some STi guy's used VF39, TMIC, and add in some relatively cheap pinks + a fuel pump and you can turn your stage 2 car into more like an STi stage 2 car. That's the idea anyway.

if you're buying all new stuff, you can spend a bit more money and get a lot more gains out of something with a bigger turbo and a bigger TMIC (or FMIC). Something like a E3-16G with a decent TMIC like perrin comes to mind. Probably about the same hp/$ but then again it is more money so either way is all good depending on how good you are at picking up used STi parts...

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#14 Old 02-27-2008, 04:56 PM
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That makes sense. Thanks Mosc that actually helps put things in perspective guess there is no point in half assing it. Im not looking for a monster but then again i'd hate to put the money into it and then be disappointed with the results. I'll be stage 2 in a few weeks and after that i was going to start looking into the turbo swap. Any sugggestions on used part websites???

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#15 Old 02-27-2008, 05:06 PM
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nasonic

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