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Old 07-01-2013, 10:37 AM   #1
BONFIRE074
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Default Input for users with 2.5 and 18gxt / 18gxt-r

Looking to upgrade my turbo, had previously had a 18g on my 2.0 wrx and now have a 2.5 wrx.

Looking to see when people see full boost on the street, ive been looking at dynoplots online and it seems like on the 2.5 guys are seeing full boost between 3,500-3900 depending on mods. which seems a little late to me. Maybe different on the street.

With a spool that late i would possibly consider the Blouch 2.5xtr Polka Pickle.

so looking for input from guys who have this on their 2.5 setup. thanks!
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Old 07-01-2013, 10:40 AM   #2
Psychoreo
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Check out Bergeron's hybrid motor on efi's dyno database. It should be on there by now.
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Old 07-01-2013, 11:15 AM   #3
BroBroBroBroBro
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Did you see the old thread about the 18gxtr and the comments about late spool or 20g spool 16g power?

i was looking for more info aswell. if its any help i saw a dynograph of a 2007 wrx with 18gxtr at 23 psi making 350hp(high reading dyno)

about 75hp up from my stage 2 car also and the curve looked really good cept it dropped off up top for some reason.
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Old 07-01-2013, 01:03 PM   #4
alakazoo22
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I have a 18G XTR on a 2.5.

on dynojet
348whp-352wtq @ 18 psi on 94 oct in 3rd gear
344whp-364wtq @ 18 psi on 94 oct in 4th gear

Full boost on street is reach near 3900-4000 in 4th gear (stock fxt 4.444 5 speed)

VF48 STI 08-12 do around is 300-310 whp on this dyno.

I trap 91 mph on 1/8 miles with no launch aid I don't use LC and FFS.
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Old 07-01-2013, 01:16 PM   #5
BONFIRE074
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Quote:
Originally Posted by alakazoo22 View Post
I have a 18G XTR on a 2.5.

on dynojet
348whp-352wtq @ 18 psi on 94 oct in 3rd gear
344whp-364wtq @ 18 psi on 94 oct in 4th gear

Full boost on street is reach near 3900-4000 in 4th gear (stock fxt 4.444 5 speed)

VF48 STI 08-12 do around is 300-310 whp on this dyno.

I trap 91 mph on 1/8 miles with no launch aid I don't use LC and FFS.
Did you run a vf turbo previously? How does the 18gxtr compare to that? worth the upgrade? how much spool do you lose between the two?
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Old 07-01-2013, 04:36 PM   #6
alakazoo22
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Quote:
Originally Posted by BONFIRE074 View Post
Did you run a vf turbo previously? How does the 18gxtr compare to that? worth the upgrade? how much spool do you lose between the two?
When I was my vf39, I have taken E-tune and I have run it for a short time. After that, Break 2 pistons (1-3) and the 2 heads need to be rebuild. But IIRC.. I've put down 260/260 on airboy in a 95*+ day.

Don't know how I make actually on airboy.

I prefer my 18G xtr over the vf39. I could run without boost all day long. With a vf39, I was always in boost.. My tuner was very impress about this turbo who hold boost very good until the redline.. like 1 psi drop.

worth the upgrade?.. For me.. yes! for other, is only a 18G..

how much spool do you lose between the two? hum... can't remember but if boost come to fast, he fall in face to fast also... but 500-800 rpm maybe.

Pm me if you want more detail about my build..
sorry my english is not good as you!
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Old 07-01-2013, 06:43 PM   #7
SnowBRDGod247
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I have an 18gxt paired w a v7 sti 2.0, yes I know your looking for info paired to a 2.5, but just thought I would share I spooled 19psi by like 4100 with my ej205. With the 207 and Avcs I now hit 22psi around 3900 so just the Avcs alone dropped it some. And that's w 3 more psi so I am assuming that on a 2.5 it would be a bit quicker. Just w my experience and a great tuner working on my car you probably will not get full boost w the 18gxt until 36-3700+ no matter what motor it is on. It is a decent size turbo at 43 lb/min which is the same as most 20g turbos (older not xt or xtr) but it holds boost for me with a 1-2psi drop at 8000 rpms. It is definitely a nice turbo and have heard from others it is awesome on the 2.5 tons of torque. I went w the 3" inlet and 8cm^2 hot side also.
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Old 07-01-2013, 07:32 PM   #8
Ilovecugars
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I have an 18g xtr 10cm on my forester xt, tmic, full exhaust, stock manifold, mbc and 73mm intake. It does spool alittle slow for an "18g" however that is simple what blouch called it I dont think it is fair to compare to a true MHI 18g. I see full boost at 4100 or so in 3rd gear 5 speed with 4.444, it holds 19psi all the way to redline no problem. Making 338whp on vd in 3rd with is completey good with me as thats exactly what I wanted while Im still on stock motor and trans.
My results are basically very similar to Alakazoo22's car. It is a good turbo and very nice to drive daily with as that little bit of lag makes it easy to run around town with out it being jumpy. I had a td04 13t before that and grew tired of crappy top end and jumpy in traffic, basically needed to just shift the power band to the right alittle for my needs.

On a side note fitment sucks, they dont tell you the xtr comes with an 18psi wastegate which sucks and a few other things could be improved.
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Old 07-01-2013, 07:45 PM   #9
RobSTI89
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I had 18gxt on my 05 sti 8cm made 343/373 on a mustang dyno. 3800 full spool with fmic!
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Old 07-02-2013, 01:39 PM   #10
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Eh a 20g will spool at full boost by 3500-4000rpm on a 2.5. Anything with "18" in it is too small, go with a 20G or bigger. With your gearing you will be fine with a bigger turbo if you your tuner knows what there doing. I just think anything smaller then a 20g is a waste of money. You could put the money in the fuel system and run e85 on a stock turbo and make those numbers that people are posting up honestly. (if you have a 09 or newer wrx that is)
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Old 07-02-2013, 01:44 PM   #11
Sypher
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People get way too caught up with spool, spool this spool that, Subarus breath like Crap up top. Do not stay with a small turbo. Your motor is HUGE, it will spool damn near anything fine and you will have plenty of power band if your using a wrx with a 5 speed. 6 speed Sti's are a little tricky since the gearing is so short, they dont like big turbos very much. My personal wrx (a 06) which I sold a few years ago and I still tune it (you can look at the 382whp thread in proven power bragging) has gone through a 16g, Momentum 16g(old school) Vf39, TD06 20G, FPRED, and back to a $200 ebay 20G. And I can say with out a doubt the best turbo for the stock 2.5 is a 20G or a FPGREEN.
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Old 07-02-2013, 04:05 PM   #12
BroBroBroBroBro
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why people always chirp and turn it into a 20G thread...
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