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06-24-2009, 08:14 PM | #1 |
Scooby Newbie
Member#: 72021
Join Date: Oct 2004
Location: BARBADOS
Vehicle:1999 JDM GC1 IMPREZA WHITE |
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.
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06-24-2009, 08:31 PM | #2 |
Scooby Guru
Member#: 6886
Join Date: May 2001
Chapter/Region:
Tri-State
Vehicle:MY01 EJ207 HTA35r AVCS ON! |
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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06-25-2009, 12:36 AM | #3 |
Scooby Specialist
Member#: 80465
Join Date: Jan 2005
Chapter/Region:
RMIC
Location: Denver
Vehicle:2001 2.5RS Black Diamond Pearl |
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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06-25-2009, 09:16 AM | #4 | ||
Scooby Newbie
Member#: 72021
Join Date: Oct 2004
Location: BARBADOS
Vehicle:1999 JDM GC1 IMPREZA WHITE |
Quote:
Quote:
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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