Welcome to the North American Subaru Impreza Owners Club Tuesday September 23, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 04-28-2012, 09:00 AM   #1
k mier
Scooby Specialist
 
Member#: 98000
Join Date: Oct 2005
Location: MO
Vehicle:
05 sti e85@420hp

Default 550+whp for DD, what's next to go boom???

Heads are ported, +1mm valves, GSC2's, good to go 55o+. Block will be Wisecos, I-beams, 12mm oil pump, etc. should be able to handle 550+ too. Exedy triple disk and the fuel system, good to go also.

This will be my daily driver. If I dot all my i's and cross all my t's on the motor/fuel/ecu side of things what will be the next thing to go boom? At 550+ will axles start dropping like flies, gear sets, dccd, etc.? How hard is it going to be to keep this thing reliable at that hp level?

Sure, I want the power, but this will be my DD, would it better to stick with something like the hta green and trade some of that power for reliability?
* Registered users of the site do not see these ads.
k mier is offline   Reply With Quote
Old 04-28-2012, 09:45 AM   #2
Layvon
NASIOC Supporter
 
Member#: 195711
Join Date: Nov 2008
Chapter/Region: MWSOC
Location: Cadillac MI
Vehicle:
STi 04/05/06/07
JBP / OBP for now

Default

Ditch the wisecos.
Layvon is online now   Reply With Quote
Old 04-28-2012, 02:59 PM   #3
pheonix991
Scooby Specialist
 
Member#: 154173
Join Date: Jul 2007
Location: Ghetto, AR
Vehicle:
2006 STI

Default

If you launch it, you could be blowing rear axels. There is a vendor on here, I think it's "driveshaftshop", or something along the lines of that name that has beefy rear axels you can get.

When I was talking with the guys at Surgeline, they said once you get a build block, next thing to go will most likely be axels.

This is assuming you get good internals.
pheonix991 is offline   Reply With Quote
Old 04-28-2012, 03:54 PM   #4
trev762
Scooby Specialist
 
Member#: 280572
Join Date: Apr 2011
Chapter/Region: E. Canada
Location: southern ontario canada
Vehicle:
2011 sti sedan
plasma blue pearl

Default

Quote:
Originally Posted by pheonix991
If you launch it, you could be blowing rear axels. There is a vendor on here, I think it's "driveshaftshop", or something along the lines of that name that has beefy rear axels you can get.

When I was talking with the guys at Surgeline, they said once you get a build block, next thing to go will most likely be axels.

This is assuming you get good internals.
I don't believe its the rear axles but the rear diff will be the first to go then there is something in the trans that will go next once the diff has bin done not sure what its called will have to look it up
trev762 is offline   Reply With Quote
Old 04-28-2012, 04:23 PM   #5
RIPNBST
Scooby Newbie
 
Member#: 314403
Join Date: Mar 2012
Location: Tulsa, OK
Vehicle:
2007 STi
OBP

Default

Drivetrain will result in a financial beating until you get it up to par. Axles, diffs, trans rebuild.

Having something built that will make 550 whp doesnt break parts, using that power frequently does. If you don't drive it like you stole it, which might be hard at first I understand, you could make the drivetrain last long enough to build it to catch up with your power.
RIPNBST is offline   Reply With Quote
Old 04-28-2012, 10:15 PM   #6
k mier
Scooby Specialist
 
Member#: 98000
Join Date: Oct 2005
Location: MO
Vehicle:
05 sti e85@420hp

Default

Was afraid the rear axles would be at their limit. What about the rear diff, what does it need to handle the power?
k mier is offline   Reply With Quote
Old 04-28-2012, 10:43 PM   #7
trev762
Scooby Specialist
 
Member#: 280572
Join Date: Apr 2011
Chapter/Region: E. Canada
Location: southern ontario canada
Vehicle:
2011 sti sedan
plasma blue pearl

Default

Quote:
Originally Posted by k mier
Was afraid the rear axles would be at their limit. What about the rear diff, what does it need to handle the power?
Quaffy rear diffs r one of the best money can buy for durability
trev762 is offline   Reply With Quote
Old 04-29-2012, 03:13 AM   #8
shirokuma
Scooby Specialist
 
Member#: 5489
Join Date: Apr 2001
Chapter/Region: NWIC
Location: The Empire of Seattle
Vehicle:
2013 FR-S
AVO Orange

Default

Given the cost to get it to do 550whp, why not just get a second car as a cheap DD so you don't have to worry about blowing everything up while sitting in traffic?
shirokuma is offline   Reply With Quote
Old 04-29-2012, 01:51 PM   #9
dillonlightman88
Scooby Newbie
 
Member#: 287889
Join Date: Jul 2011
Location: Hays, kansas
Vehicle:
2008 Wrx

Default

^^^^^^this. Often when an individual is in a financial position to do a build that produces 550+, there is no need to drive it to the dentist. If you've got that kind of cash flow do yourself a favor and buy a second vehicle.
dillonlightman88 is offline   Reply With Quote
Old 04-29-2012, 02:25 PM   #10
BlackFighter
Scooby Specialist
 
Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:
2004 WRX STI Black
RalliSpec Shortblock

Default

^^^^^ yap, that what I'm doing right now. i feel sorry for my baby, beating on here day after day. she's all black and blue.
BlackFighter is offline   Reply With Quote
Old 04-29-2012, 04:35 PM   #11
k mier
Scooby Specialist
 
Member#: 98000
Join Date: Oct 2005
Location: MO
Vehicle:
05 sti e85@420hp

Default

Quote:
Originally Posted by shirokuma View Post
Given the cost to get it to do 550whp, why not just get a second car as a cheap DD so you don't have to worry about blowing everything up while sitting in traffic?
Had a backup before the first mods hit. That car will soon go to boy as he is now 16.

Not driving the backup longer than necessary while making payments on the suby. The suby will be a reliable daily driver, either it will be built to hold 550+, or hp goals will be lowered. Did NOT buy this car for an expensive yard ornament.

What exactly needs to go into the rear diff and tranny?
k mier is offline   Reply With Quote
Old 04-29-2012, 05:00 PM   #12
trev762
Scooby Specialist
 
Member#: 280572
Join Date: Apr 2011
Chapter/Region: E. Canada
Location: southern ontario canada
Vehicle:
2011 sti sedan
plasma blue pearl

Default

[quote="k mier"]

Had a backup before the first mods hit. That car will soon go to boy as he is now 16.

Not driving the backup longer than necessary while making payments on the suby. The suby will be a reliable daily driver, either it will be built to hold 550+, or hp goals will be lowered. Did NOT buy this car for an expensive yard ornament.

What exactly needs to go into the rear diff and tranny?[/QUOT
Like your logic with the suby its there to be driven regardless of what mods but for the diff would do all the internals and as far as the tranny alot of guys will put chrome-ally gears 1 through 3rd.
trev762 is offline   Reply With Quote
Old 04-29-2012, 05:06 PM   #13
trev762
Scooby Specialist
 
Member#: 280572
Join Date: Apr 2011
Chapter/Region: E. Canada
Location: southern ontario canada
Vehicle:
2011 sti sedan
plasma blue pearl

Default

But on the other hand just like the old saying "got pay to play" so expect the worst when heavily Modding cars. If its reliability u r looking for don't go past stg 2 good luck
trev762 is offline   Reply With Quote
Old 04-29-2012, 05:31 PM   #14
jamal
Scooby Guru
 
Member#: 71875
Join Date: Oct 2004
Location: Montana
Vehicle:
98 2.5GT
my wheels fit

Default

Quote:
Originally Posted by k mier View Post
Had a backup before the first mods hit. That car will soon go to boy as he is now 16.

Not driving the backup longer than necessary while making payments on the suby. The suby will be a reliable daily driver, either it will be built to hold 550+, or hp goals will be lowered. Did NOT buy this car for an expensive yard ornament.

What exactly needs to go into the rear diff and tranny?
not really anything. new rear axles is all you really need. An exedy triple is kind of overkill though and probably won't be fun to drive. The act xtss clutch can put up with a lot and is pretty smooth.

cooling is going to be your biggest issue if you drive the car hard/track it.
jamal is offline   Reply With Quote
Old 04-29-2012, 06:04 PM   #15
k mier
Scooby Specialist
 
Member#: 98000
Join Date: Oct 2005
Location: MO
Vehicle:
05 sti e85@420hp

Default

Quote:
Originally Posted by jamal View Post
An exedy triple is kind of overkill though and probably won't be fun to drive.
cooling is going to be your biggest issue if you drive the car hard/track it.
I was under the impression the triple, or double disk, engaged smooth, more like stock but with a large increase in noise.?

Been wondering about cooling. Looking at an awic setup that may leave more of the radiator surface are open. Stock radiator tank is leaking anyway, time to replace.
k mier is offline   Reply With Quote
Old 04-29-2012, 06:34 PM   #16
purplewrx
Scooby Specialist
 
Member#: 315291
Join Date: Mar 2012
Chapter/Region: Tri-State
Location: Long island
Vehicle:
2012 WRX
PBP

Default

Quote:
Originally Posted by k mier View Post
Had a backup before the first mods hit. That car will soon go to boy as he is now 16.

Not driving the backup longer than necessary while making payments on the suby. The suby will be a reliable daily driver, either it will be built to hold 550+, or hp goals will be lowered. Did NOT buy this car for an expensive yard ornament.

What exactly needs to go into the rear diff and tranny?
I had no idea you needed 500hp so your car wouldn't be a yard ornament.

Let me guess your going to do NOTHING but go to work and back with all this power :roll eyes:

Might as well leave it stock and track the car. Use it like a real man.
purplewrx is offline   Reply With Quote
Old 04-29-2012, 09:35 PM   #17
timeXlost
Scooby Specialist
 
Member#: 113924
Join Date: May 2006
Chapter/Region: NESIC
Location: Medway, MA
Vehicle:
2005 STI....Broken
93 RX7...Not Broken

Default

there is seriously so much bad info in the thread.

the weiscos will be fine
the transmission and rear diff will be fine
the axles might...need attention
the triple is a good clutch, but id look into a act sprung 6 puck. the act xtss will not support that power.

upgrade the rad with a good one...no crap rebadged ebay garbage.
timeXlost is online now   Reply With Quote
Old 04-29-2012, 10:09 PM   #18
jays05
Scooby Specialist
 
Member#: 78165
Join Date: Dec 2004
Chapter/Region: South East
Location: SC
Vehicle:
05 STI 35r + e85

Default

Your driver's license might go boom

Your axles will probably be fine unless you launch it a lot and try to ride out wheelhop.


IMO, anybody who says you can make big power "reliably" with these cars is trying to make money off you. I didn't see any mention of what turbo you'll be running. Your motor looks like it will flow a lot of air, so if you have a turbo big enough to hit your 550whp goal without being on the ragged edge, it should last a while.
jays05 is offline   Reply With Quote
Old 04-29-2012, 10:37 PM   #19
jamal
Scooby Guru
 
Member#: 71875
Join Date: Oct 2004
Location: Montana
Vehicle:
98 2.5GT
my wheels fit

Default

Quote:
Originally Posted by k mier View Post
I was under the impression the triple, or double disk, engaged smooth, more like stock but with a large increase in noise.?

Been wondering about cooling. Looking at an awic setup that may leave more of the radiator surface are open. Stock radiator tank is leaking anyway, time to replace.
Every multi-plate clutch I have driven (at least 5-6) has sucked. Although come to think of it I think the exedy triple was one of the better ones. The thing I don't like about them is how harshly they engage which shocks the drivetrain. A single disc with a sprung hub absorbs some of that shock loading and I like to think it helps a bit in not breaking stuff.

If you have access to e85 (you're not making 550whp on pump gas anyway), keeping the car cool is a little easier. A hood with vents and no scoop is very helpful in getting air through the coolers and out of the engine bay.
jamal is offline   Reply With Quote
Old 04-30-2012, 04:33 AM   #20
k mier
Scooby Specialist
 
Member#: 98000
Join Date: Oct 2005
Location: MO
Vehicle:
05 sti e85@420hp

Default

Quote:
timeXlost

the axles might...need attention
Going to check into some axles.


Quote:
jays05

IMO, anybody who says you can make big power "reliably" with these cars is trying to make money off you. I didn't see any mention of what turbo you'll be running. Your motor looks like it will flow a lot of air, so if you have a turbo big enough to hit your 550whp goal without being on the ragged edge, it should last a while.
bw sx300, .88 single scroll, think this is the correct part # from the AirWerks catalog 177511.


Quote:
jamal
Every multi-plate clutch I have driven (at least 5-6) has sucked. Although come to think of it I think the exedy triple was one of the better ones. The thing I don't like about them is how harshly they engage which shocks the drivetrain. A single disc with a sprung hub absorbs some of that shock loading and I like to think it helps a bit in not breaking stuff.

If you have access to e85 (you're not making 550whp on pump gas anyway), keeping the car cool is a little easier. A hood with vents and no scoop is very helpful in getting air through the coolers and out of the engine bay.
I'll have to stick with the triple, if for no other reason that the amount of $ it cost.

Been running e85 in the dd for the last few years, plans are to keep running it.

As far as getting cool air through the engine bay, what about turning the oem hood scoop around?
k mier is offline   Reply With Quote
Old 04-30-2012, 05:53 AM   #21
Layvon
NASIOC Supporter
 
Member#: 195711
Join Date: Nov 2008
Chapter/Region: MWSOC
Location: Cadillac MI
Vehicle:
STi 04/05/06/07
JBP / OBP for now

Default

For a build of 550 WHP I wouldn't trust weiscos. I stand by my word.

JE and CP offer a much higher quality piston and don't cost too much more.
Layvon is online now   Reply With Quote
Old 04-30-2012, 06:26 AM   #22
juanmedina
Scooby Guru
 
Member#: 133146
Join Date: Nov 2006
Location: SC
Vehicle:
07 FPgreen 7.37@95
WRX VF39+E85 12.0, 121mph

Default

Quote:
Originally Posted by Layvon View Post
For a build of 550 WHP I wouldn't trust weiscos. I stand by my word.

JE and CP offer a much higher quality piston and don't cost too much more.
Are you serious? Why?

Crystal and i run wisecos and we make over 500whp
juanmedina is offline   Reply With Quote
Old 04-30-2012, 12:41 PM   #23
oceanwater48
*** Banned ***
 
Member#: 315882
Join Date: Apr 2012
Chapter/Region: International
Location: exit 483
Vehicle:
V8 U make
Baby Poop

Default

Everyone has their opinion juanmedina. No need to drag queen out of it.

Just like my opinion, aftermarket clutch and flywheel are ****. They are just expensive, wear your tranny out faster.
oceanwater48 is offline   Reply With Quote
Old 04-30-2012, 11:27 PM   #24
jamal
Scooby Guru
 
Member#: 71875
Join Date: Oct 2004
Location: Montana
Vehicle:
98 2.5GT
my wheels fit

Default

Quote:
Originally Posted by k mier View Post
As far as getting cool air through the engine bay, what about turning the oem hood scoop around?
doesn't really work that way. the back of the scoop is getting into the high pressure area at the base of the windshield so air is still actually flowing back into the scoop when you do that. The vents need to be toward the front of the hood. Kaminari has one of the better ones out there.
jamal is offline   Reply With Quote
Old 05-01-2012, 03:21 AM   #25
NoGraffix
Scooby Specialist
 
Member#: 276209
Join Date: Mar 2011
Chapter/Region: MWSOC
Location: Windy City
Vehicle:
I am Rub
Function>Form

Default

I feel like a 500whp car as a daily would just not be fun to drive. It's too quick for the streets, the peak torque is going to be so far to the right of the powerband, the cost of maintaining the car to simply get to work, grocery store, ect, seems like a waste of money.
NoGraffix is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
is my car goin to go boom? Subie-Do000 Factory 2.0L Turbo Powertrain 9 03-18-2009 05:01 AM
what's supposed to go/attach here (missing bolts in engine bay) wangless Newbies & FAQs 13 02-28-2008 07:30 AM
What's required to go to Nationals? Patrick Olsen Motorsports 6 05-19-2004 01:58 PM
What's needed to go offroad? Tas Motorsports 12 11-19-2001 01:11 PM
What's next to upgrade....seats! What are people using? gtguy Legacy Forum 7 01-08-2001 09:02 AM


All times are GMT -4. The time now is 12:46 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.