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Old 11-15-2008, 07:20 PM   #1
IBleedRallyBlue
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Default How much power?

I've been trying to figure out what kind of power that I should be at with my build.

parts are:

EJ257 shortblock
wrx heads
tgv deletes
brian crower 272 cams
bc titanium valve springs and retainers
800cc injectors
255 walbro
gt28rs
front mount
3" turbo back
perrin fuel rails
catless up-pipe

I think that's it.
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Old 11-15-2008, 07:26 PM   #2
rjrutzky
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not much. why the tiny turbo?
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Old 11-15-2008, 07:31 PM   #3
IBleedRallyBlue
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Originally Posted by rjrutzky View Post
not much. why the tiny turbo?

I want to set it up for road course but still be able to beat the evos that are around town. Do you think a gt3076 will still be good for road course/auto cross? I want about 400 whp.
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Old 11-15-2008, 07:34 PM   #4
skatefather
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ok honestly i was going to be mean, but instead i will only say this...

depends on the tune. will it have over 300, more than likely but anything beyond that is speculative.
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Old 11-15-2008, 07:48 PM   #5
wrxej25
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if you want around 400whp then +1 for the gt3076
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Old 11-15-2008, 07:50 PM   #6
IBleedRallyBlue
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Originally Posted by skatefather View Post
ok honestly i was going to be mean, but instead i will only say this...

depends on the tune. will it have over 300, more than likely but anything beyond that is speculative.
I know the tune will have alot to do with how much power i make, but what would you recommend to make about 400 whp?
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Old 11-15-2008, 07:51 PM   #7
IBleedRallyBlue
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if you want around 400whp then +1 for the gt3076
And still spool up quick enough for road course/autocross?
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Old 11-15-2008, 07:59 PM   #8
treystoys
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In my opinion, you should not even be a little bit worried about spool with a 2.5 block...a for instance...I have a ver 8 jdm sti motor with a dom 2.5r (hybrid gt3071 with a small inlet) and my buddy has a stock block 06 sti with a gt35r kit and he still spools a good 5-800 rpm faster than me. Pick the turbo thats going to make just over the power you need, then you'll have a bit in reserve. Your not going to have problems spooling any of the gt30 turbos.

ttyl

Trey
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Old 11-15-2008, 08:26 PM   #9
AWDWRXLOVER
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you better do forged pistons if you plan on 400 whp daily. gt3076, sr56, fp red are all turbos that wil get you there.
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Old 11-15-2008, 08:44 PM   #10
IBleedRallyBlue
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Alright, thanks for the advice.
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Old 11-16-2008, 11:01 AM   #11
4ST-AIR
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Quote:
Originally Posted by treystoys View Post
In my opinion, you should not even be a little bit worried about spool with a 2.5 block...a for instance...I have a ver 8 jdm sti motor with a dom 2.5r (hybrid gt3071 with a small inlet) and my buddy has a stock block 06 sti with a gt35r kit and he still spools a good 5-800 rpm faster than me. Pick the turbo thats going to make just over the power you need, then you'll have a bit in reserve. Your not going to have problems spooling any of the gt30 turbos.

ttyl

Trey
Are you kidding me? You should have have made peak WTQ by 3700 on a 3071. There is no GT35R Ive ever seen spool, up 500-800RPM's faster than a 307x

If you want to play with the EVO's on the street and still have a good road course on a 2.5L go with a GT3076R .63 for cone racers, .82 if your talking high speed road course like TA or if that is to much lag go 3071 for the lower end but you'll pay a little up top.

You have to pick your evil and live with it.
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Old 11-16-2008, 11:21 AM   #12
THE-95-STi
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Quote:
Originally Posted by 4ST-AIR View Post
Are you kidding me? You should have have made peak WTQ by 3700 on a 3071. There is no GT35R Ive ever seen spool, up 500-800RPM's faster than a 307x
on a 2.0L block...your are only kidding with yourself, that is perfectly normal

2.0L & 30R
2.5L & 35R

That was the comparrison being made

Reading>You
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Old 11-16-2008, 02:21 PM   #13
treystoys
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Quote:
on a 2.0L block...your are only kidding with yourself, that is perfectly normal

2.0L & 30R
2.5L & 35R

That was the comparrison being made

Reading>You
Lol...exactly...thanks PSM-04-STi...and again, my turbo is a hybrid it only uses the garret 3071 bb cartridge around it is a mitsu front cover and exhaust housing...the inlet is the smallish 2.5" too. In the near future I'll be switching over to an atp 3076 stock location with external gate (this has the 3" inlet) and I'll see how it compares to my buddies 35r, but I still suspect it'll be slower to spool with the 2 liter displacement.

Sorry to the op for threadjacking...I was only trying to tell you do not worry about the spool, the 2.5 block should spool what ever turbo you wish to use.

ttyl

Trey
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Old 11-16-2008, 02:58 PM   #14
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First off, that turbo will get you no where near 400 whp. If you do head work and use a 3071r with some meth you should be near your 400 whp on a forgiving dyno. This turbo will also give you pretty respectable spool.
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Old 11-16-2008, 03:43 PM   #15
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A Gt28 on a built 2.5L is silly. The 3071 will spool very fast and may hold decent power with your cams. 400 on pump idk, prob not. The 3076 will give you good power, go for the .63 hot side for great spool. I run the 3076 with the .63 exhaust housing and have never found myself wanting better spool, only a little more top end power
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Old 11-16-2008, 11:35 PM   #16
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A GT28 isn't a horrible choice for a 2.5 overall. There are multiple GT28's, keep in mind, and the GT28RS is roughly in between a 16G and an 18G in size. It would spool like a monster, but definitely not anywhere near 400whp.

My recommendation if you want something that will spool quickly is a TD05 20G and a top mount. Front mounts make more power, but won't help your spool any. A 20G will make more power midrange and top end, and with proper supporting mods, will spool fairly quickly...I can hit full boost before 3300RPM.
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