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Old 06-24-2009, 08:14 PM   #1
Ramon_12345
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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 C, 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 wouldnt 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.
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Old 06-24-2009, 08:31 PM   #2
fastnoypi
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Member#: 6886
Join Date: May 2001
Chapter/Region: Tri-State
Vehicle:
MY01 EJ207 HTA35r
nothing to see, i'm stock

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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.
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Old 06-25-2009, 12:36 AM   #3
yarrgh
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Location: Aurora, CO
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2001 2.5RS
Black Diamond Pearl

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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?
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Old 06-25-2009, 09:16 AM   #4
Ramon_12345
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Location: BARBADOS
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1999 JDM GC1 IMPREZA
WHITE

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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.
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