Welcome to the North American Subaru Impreza Owners Club Monday March 18, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Service & Maintenance

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.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 06-24-2009, 08:14 PM   #1
Ramon_12345
Scooby Newbie
 
Member#: 72021
Join Date: Oct 2004
Location: BARBADOS
Vehicle:
1999 JDM GC1 IMPREZA
WHITE

Default STi Radiator Cap Question

Has anyone on the forum installed a STi radiator cap on an Impreza (non-WRX and non-STi) and had any problems?

The reason that I ask is that I own a 1999 GC1 Subaru Impreza that has an EJ15 engine and I was thinking of purchasing the STi thermostat, which opens at 71 ºC, and the STi radiator cap, rated at 1.3 bar (130 kPa) from Rallispec, but I am somewhat concerned about the fact that the cap pressure is so high considering that the current radiator cap that is on my car is rated at 1.07 bar (107 KPa) and I wouldn’t want the increase in cooling system pressure to have any adverse effect on my radiator or my head gaskets.

Looking forward to any and all responses.
* Registered users of the site do not see these ads.
Ramon_12345 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 06-24-2009, 08:31 PM   #2
fastnoypi
Scooby Guru
 
Member#: 6886
Join Date: May 2001
Chapter/Region: Tri-State
Vehicle:
MY01 EJ207 HTA35r
AVCS ON!

Default

whats your stock radiator end tanks made of? if it is plastic just get a stock rated cap from your local auto parts store or you will possibly blow your rad.
fastnoypi is offline   Reply With Quote
Old 06-25-2009, 12:36 AM   #3
yarrgh
Scooby Specialist
 
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Denver
Vehicle:
2001 2.5RS
Black Diamond Pearl

Default

I've heard stories of the sti cap breaking the stock radiator. What are you doing with it that it needs to have the cooling capacity changed?
yarrgh is offline   Reply With Quote
Old 06-25-2009, 09:16 AM   #4
Ramon_12345
Scooby Newbie
 
Member#: 72021
Join Date: Oct 2004
Location: BARBADOS
Vehicle:
1999 JDM GC1 IMPREZA
WHITE

Default

Quote:
Originally Posted by fastnoypi View Post
whats your stock radiator end tanks made of? If it is plastic just get a stock rated cap from your local auto parts store or you will possibly blow your rad.
My stock radiator end tanks are made of plastic.

Quote:
Originally Posted by yarrgh View Post
I've heard stories of the sti cap breaking the stock radiator. What are you doing with it that it needs to have the cooling capacity changed?
I just want the engine to have a wider cooling range to have the engine temperature slightly cooler as well as to assist with the cooling of the automatic transmission fluid.

The way I see it, right now with the OEM cap rated at 1.07 bar, the boiling temperature of the coolant is 101.5 °C with the thermostat set to open at 82 °C. Now with the STi radiator cap, the boiling temperature would be 107.5 °C and the STi thermostat opens at 71 °C, so that means my overall temperature range would move from 19.5 °C to 36.3 °C.

Thanks for the responses and I think I will stick to just purchasing the STi thermostat and forget about the radiator cap.
Ramon_12345 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
Blitz intake/SPT shroud/SPT oil cap/STi radiator cap salmonfacesalad Interior/Dressup/Audio & Security 9 08-10-2008 08:48 PM
STi JDM Radiator Cap question yo14jman Newbies & FAQs 3 10-11-2007 06:05 PM
Fs: Sti Radiator Cap & Oem Cap! dplacen Engine/Power/Exhaust 6 06-15-2007 04:14 AM
FS: STi radiator cap and Zerosports oil cap blk rix wagon Private 'For Sale' Classifieds 48 06-14-2005 01:38 AM
FS: SARD BOV, STi radiator cap, Billet Oil Cap adrive43 Tri-State Area Forum 5 05-31-2004 09:17 PM

All times are GMT -4. The time now is 10:18 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.