Welcome to the North American Subaru Impreza Owners Club Friday October 31, 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 > Normally Aspirated 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 02-06-2001, 06:23 AM   #1
MBX Motorsports
Scooby Newbie
 
Member#: 3726
Join Date: Jan 2001
Location: Newark, DE
Vehicle:
2001 2.5RS
Blue Ridge Pearl

Post Transmission & X-fer case strength ...

Ok, I'm about to start modding my new '01 RS. My question is, how strong is the drivetrain on this car? On my previous car, after lightly modding it, I blew the transmission (as in split the bell housing damn near in half).

Yes, I know how to drive stick, I've never owned an automatic ... so it's not a question of skills, it's more on how much extra HP can the stock powertrain handle before I'd have to build it up a bit? I want to add a 50 shot of NOS, exhaust, headers, CAI and a bigger TB once I get back from my wedding in March.

Thanks in advance for your help

Dave
2001 2.5RS
1977 Fiancee - Will trade.
* Registered users of the site do not see these ads.
MBX Motorsports is offline   Reply With Quote
Old 02-06-2001, 09:19 AM   #2
CosmoTheCat
Scooby Newbie
 
Member#: 3409
Join Date: Jan 2001
Chapter/Region: NWIC
Location: Woolley
Vehicle:
1998 Ram 2500
Green.

Post

If it's the STi transfer case well then, um, it's pretty darned strong. But unless you're going to go rock crawling with your Subie I'd just take it out and put a bottle of water in the trunk (to preserve weight).

The stock 5-speed seems to be the week link. Well, after the clutch. I guess what you'd want to do is upgrade the gears. I think that with little boost (5lbs?) it's ok, but I'm not sure about the nitrous. 50hp would probably be ok, but I think after that you start breaking stuff.

Anybody with experience breaking stuff wanna verify?
CosmoTheCat is offline   Reply With Quote
Old 02-06-2001, 09:49 AM   #3
Necromancer
Scooby Specialist
 
Member#: 477
Join Date: Oct 1999
Location: Vancouver
Vehicle:
GC4 -> GGA -> GM6
Yeah, that's about right.

Post

... "a question of skills"?
Necromancer is offline   Reply With Quote
Old 02-06-2001, 10:38 AM   #4
MBX Motorsports
Scooby Newbie
 
Member#: 3726
Join Date: Jan 2001
Location: Newark, DE
Vehicle:
2001 2.5RS
Blue Ridge Pearl

Post

Necro - Yeah, as in knowing how to shift properly when racing the car, without beating the **** out of the gears. All I'm asking is, how much power can the stock drivetrain handle before it becomes prone to damage. (aside from the clutch, which I already know isn't the greatest) I'm talking about the gears in the tranny, the transfer case and the rear end. At what point would you have to strengthen those components?

I'm building my car up for 1/4 mile racing, and some auto-x. Generally, an all round faster car.
MBX Motorsports is offline   Reply With Quote
Old 02-07-2001, 12:32 AM   #5
stimpy
Homicidal Maniac
Moderator
 
Member#: 1612
Join Date: Jun 2000
Location: Austin, TX
Vehicle:
2008 STI

Post

Heres my attempt:

The strength of the gearbox is still unknown. There are people that are running 10-12psi on stock gears while there are others blowing gears at 5-7psi. The general concensus is that if you do not abuse your gears, they will last some miles, but eventually they will let go. I think shiv lost his 2nd gear after 30k turbo miles at 10psi. Larry Ganz lost his 2nd after 2 months of turbo at 5psi (9psi briefly). There are probably more people with long lasting trannies with turbo than those with turbos and bad trannies. I _think_ that JC Sports stated that a legacy turbo half shaft will work in our tranny and strengthen up our weak gear. Basically, I just went ahead and budgeted in a tranny fix, since I know it'll go eventually.
stimpy 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
FS/FT: Tons of transmission parts, dccd, driveshaft, case with broken internals wrxedya Private 'For Sale' Classifieds 54 12-04-2005 06:16 PM
04 WRX struts & springs fer sale local first JC_595 Mid West Subaru Owners Club Forum -- MWSOC 4 12-23-2004 04:33 PM
'02 WRX Transmission & Lawsuit Dis3ngag3d Warranty Issues & SOA Problems 18 08-09-2004 07:31 PM
Transmission & ABS Fixed WReX_rated Bay Area Impreza Club Forum -- BAIC 0 11-21-2002 06:14 PM
Synthetic Transmission & Diff. Fluid Dan_E Normally Aspirated Powertrain 86 02-01-2001 09:22 PM


All times are GMT -4. The time now is 08:23 PM.


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.