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Old 02-06-2011, 03:56 PM   #1
alphaomega0
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Default from vf39 to blouch 18gxt

right now with the xpt tune i am hitting 300whp-345 wtq, just looking to increase the whp to 340-350 range is it worth for me to go with this turbo? also would like to upgrade the inlet is there an advantage to go with hard inlet vs silicon? was looking at the aps, anyone runing this can tell me if there is any fitment issues?
also if anyone has this turbo can you tell me where about does it hit full boost?


mods i have now
cobb tbe
prodrive bcs
pw timic
walbro 255
aps cai 65mm
grimmspeed uppipe
grimmspeed pnp mani with the x pipe
prodrive crank pully
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Old 02-06-2011, 07:42 PM   #2
ammo0000
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An 18g should get you around those numbers. Check the Proven Power Bragging section and look for similar setups to yours to find what others are making. The advantage of a hard inlet pipe vs. a silicone is that the hard inlet pipe won't collapse like a silicone one can. There are wire-reinforced silicone inlets out there that help combat inlet collapse, but I haven't seen any comparative tests to prove that it works any better. A hard inlet WON'T collapse, period. You shouldn't have any fitment issues with any of the name brand inlets. As for when you'll see full boost, you should be able to tell by looking at the dyno charts while you're in the Proven Power Bragging section.
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Old 02-06-2011, 09:21 PM   #3
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Quote:
Originally Posted by ammo0000 View Post
An 18g should get you around those numbers. Check the Proven Power Bragging section and look for similar setups to yours to find what others are making. The advantage of a hard inlet pipe vs. a silicone is that the hard inlet pipe won't collapse like a silicone one can. There are wire-reinforced silicone inlets out there that help combat inlet collapse, but I haven't seen any comparative tests to prove that it works any better. A hard inlet WON'T collapse, period. You shouldn't have any fitment issues with any of the name brand inlets. As for when you'll see full boost, you should be able to tell by looking at the dyno charts while you're in the Proven Power Bragging section.
i did look but couldnt find any setup with that turbo, is any one using the new 18gxt?
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Old 02-06-2011, 10:35 PM   #4
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I got 324whp (Airboy Road dyno) with a standard 18G 8cm. Close setup but you have a better TMIC + headers, up pipe and CAI... You can get to 350, I think... But there is only one way you`ll find out
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Old 02-06-2011, 10:59 PM   #5
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My VF39 setup made about 300whp/350wtq.

My hta68 makes 352/377 now, on the same dyno, with less mods than yours. From what I've heard, the 18gxt should easily match that, if not better.

Same dyno, 50whp increase.
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Old 02-07-2011, 12:13 AM   #6
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Originally Posted by Dave D. View Post
My VF39 setup made about 300whp/350wtq.

My hta68 makes 352/377 now, on the same dyno, with less mods than yours. From what I've heard, the 18gxt should easily match that, if not better.

Same dyno, 50whp increase.
damn thats allot of TQ not scared for the tranny?
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Old 02-07-2011, 12:14 AM   #7
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To be safe you would get a 20G, and hit those numbers all day.

Other wise 18G xt 8cm will get close, with meth for sure.
A lot lies in the supporting mods and fuel type.
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Old 02-07-2011, 12:15 AM   #8
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Quote:
Originally Posted by Ferraz View Post
I got 324whp (Airboy Road dyno) with a standard 18G 8cm. Close setup but you have a better TMIC + headers, up pipe and CAI... You can get to 350, I think... But there is only one way you`ll find out
you have the 7 or 8cm hot side? and where about do you hit full boost?
i am going to get a inlet and from what ive read its suppose to shift the power band slightly left, since ill be doing the turbo and inlet at the same time i wont know whats what ,
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Old 02-07-2011, 12:19 AM   #9
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Quote:
Originally Posted by Kupkake View Post
To be safe you would get a 20G, and hit those numbers all day.

Other wise 18G xt 8cm will get close, with meth for sure.
A lot lies in the supporting mods and fuel type.
my car is mostly city driven, ill get the 8cm hot side so thats suppose to help with the off boost respond and top end but i am not looking for the lag the 20g will bring, even though it would get me exactly there, after this i am done with power , wanted to just maximize the setup i have with a better turbo,
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Old 02-07-2011, 08:43 AM   #10
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Quote:
Originally Posted by alphaomega0 View Post
you have the 7 or 8cm hot side? and where about do you hit full boost?
i am going to get a inlet and from what ive read its suppose to shift the power band slightly left, since ill be doing the turbo and inlet at the same time i wont know whats what ,
I got the 8cm 18G. I see full boost around 3400; 3500 rpm, but I in a very conservative tune as I'm very scared of blowing my tranny. I hope I can build my tranny this year, so I can go all out on E100.
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Old 02-07-2011, 11:23 AM   #11
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Quote:
Originally Posted by alphaomega0
right now with the xpt tune i am hitting 300whp-345 wtq, just looking to increase the whp to 340-350 range is it worth for me to go with this turbo? also would like to upgrade the inlet is there an advantage to go with hard inlet vs silicon? was looking at the aps, anyone runing this can tell me if there is any fitment issues?
also if anyone has this turbo can you tell me where about does it hit full boost?

mods i have now
cobb tbe
prodrive bcs
pw timic
walbro 255
aps cai 65mm
grimmspeed uppipe
grimmspeed pnp mani with the x pipe
prodrive crank pully
The 18g xt is the new 20g, and yes it is worth it if you're not looking for lag and too much power.

Hard inlet is hard and silicone is soft and might collapse but Perrin seems to have addressed this issue. That is the basic difference, they both let more air in so not much advantage over the other powerwise. APS seems to be a popular choice but as far as figment goes, do some research.

My 20g 7cm hits full boost at 3100rpms so I don't know what lag you are talking about. This turbo is a billet 20g which means it supposed to help with spool....meaning it should spool sooner. But if it's an 8cm you should be looking at 2900-3200rpms range. I see you have a ported manifold and an uppipe which should help you with spool.
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Old 02-07-2011, 11:52 AM   #12
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What kind of octane do you get in your fuel up in Montreal? We're stuck with 91 octane in CA and am just curious what how much of a hp difference I would see with comparable mods on my car.
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Old 02-07-2011, 12:44 PM   #13
Dave D.
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Quote:
Originally Posted by alphaomega0 View Post
damn thats allot of TQ not scared for the tranny?
I don't force anything when I drive my manual. But I'm prepared for the possibility. (Fingers crossed)
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Old 02-07-2011, 12:52 PM   #14
Kupkake
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I flip flop between and 18g 8cm & the FP HTA68 on a daily basis.

Most people say 8cm is a must for the 2.5L, while almost every HTA68 owner says its perfect... oh decisions, decisions...
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Old 02-07-2011, 01:23 PM   #15
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Quote:
Originally Posted by Kupkake View Post
I flip flop between and 18g 8cm & the FP HTA68 on a daily basis.

Most people say 8cm is a must for the 2.5L, while almost every HTA68 owner says its perfect... oh decisions, decisions...

I'm surprised nobody mentioned some injectors. Could always go meth too for a bit more gain without going bigger turbo.

To second Kupake, I've yet to hear anything bad about HTA68
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Old 02-07-2011, 01:39 PM   #16
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Quote:
Originally Posted by DerekB707 View Post
What kind of octane do you get in your fuel up in Montreal? We're stuck with 91 octane in CA and am just curious what how much of a hp difference I would see with comparable mods on my car.
94oct, thats what i got tuned for..
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Old 02-07-2011, 01:40 PM   #17
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Quote:
Originally Posted by al82 View Post
The 18g xt is the new 20g, and yes it is worth it if you're not looking for lag and too much power.

Hard inlet is hard and silicone is soft and might collapse but Perrin seems to have addressed this issue. That is the basic difference, they both let more air in so not much advantage over the other powerwise. APS seems to be a popular choice but as far as figment goes, do some research.

My 20g 7cm hits full boost at 3100rpms so I don't know what lag you are talking about. This turbo is a billet 20g which means it supposed to help with spool....meaning it should spool sooner. But if it's an 8cm you should be looking at 2900-3200rpms range. I see you have a ported manifold and an uppipe which should help you with spool.
i thought you were talking about the 20g xt.. yeah my vf39 hits full boost by 3k so i am looking for the same thing, also was planning on porting and coating the turbo to help lag

Last edited by alphaomega0; 02-07-2011 at 01:47 PM.
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Old 02-07-2011, 01:47 PM   #18
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Quote:
Originally Posted by CarlN View Post
I'm surprised nobody mentioned some injectors. Could always go meth too for a bit more gain without going bigger turbo.

To second Kupake, I've yet to hear anything bad about HTA68
nothing wrong with the hta68 and i was looking into that for a while, but i plan on getting the upgraded actuator which is an option on the 18g for better boost control, 18g has a 8cm option which i didnt see for the hta68, from everything ive read its not just the power and lag when comparing 7 to 8cm but the off boost response and since my car is mostly city driven and most of the time i shift around 3 for fuel millage i need that. again i could be wrong but everyone seems to say there is no lag difference between the 2
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Old 02-07-2011, 01:50 PM   #19
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Quote:
Originally Posted by CarlN View Post
I'm surprised nobody mentioned some injectors. Could always go meth too for a bit more gain without going bigger turbo.

To second Kupake, I've yet to hear anything bad about HTA68
didnt say since i figured it was a must and not really worth talking about
but i was looking for a 750cc and for some reason my tuner said get the 850cc, dont want meth since i dont want to worrie about it runing out and the fail safe not kicking in and so on.. seen some horror stories around here with meth and engine blowing
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Old 02-07-2011, 08:11 PM   #20
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Default 18g Xt

I have this on my hybrid 2.5 ltr. Currently running stock WRX exhaust with Cobb downpipe. Ran 310 hp/ 337 tq. The restriction is my 2.5" exhaust.It does have the 8 CM inlet. Gimmick piping to turbo. No collapsing problems. I only have WRX cams, but do have the EQ Tuning CNC job on my 205 heads.

It spools at 3500 RPM. But between this turbo and the 2.5 displacement, it has power continually in all RPM ranges. Due to cams it falls off on top end, but I never take it above 6K RPM.

You can get to your power goals with this turbo. I do have ID 1000 injects so I have some head room for E85.

Good luck on your project!
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Old 02-08-2011, 03:15 AM   #21
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I just saw a 20gxt on an sti with basic mods do 328whp on a mustang dyno.
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Old 02-08-2011, 10:35 AM   #22
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I just saw a 20gxt on an sti with basic mods do 328whp on a mustang dyno.
where did the 20gxt hit full boost?
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Old 02-08-2011, 01:55 PM   #23
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Right around 3200. Those things spool like crazy. The car had some boost creep issues or u think it could have done more.

Think I'm gonna use a 16gxt for my build. Sweet turbos.
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Old 02-08-2011, 04:00 PM   #24
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To me its HTA68 or 18G-XT 8cm2

None the less if not purely for the 8cm hotside, i'll prob end up getting the 18g xt 8cm and having it tuned to save the trans until I can get an 6spd or the later...
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Old 02-08-2011, 05:36 PM   #25
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Quote:
Originally Posted by Kupkake View Post
To me its HTA68 or 18G-XT 8cm2

None the less if not purely for the 8cm hotside, i'll prob end up getting the 18g xt 8cm and having it tuned to save the trans until I can get an 6spd or the later...
I'd go that route. The XT line impressed the hell out of me. I've never heard a 20g spool like that before. Crazy power too.

You may need to port your waste gate though. So be prepared for that.

I'm leaning 16 just because the I don't have confidence in the hybrid holding a large 18... but if I go sti long block I'll probably go the same route you are and shoot for something like 300-330whp.
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