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The mkiv Supra Owners Club

Can someone please clear something up?? 1.3bar rad caps.. are they bad??


Jim_1979
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Why would they cause older heater matrixes to blow? Also, why no point?

 

I'm not being a tit here! Genuinley interested!

 

I used to run a TRD cap on my old Mr2 turbo and it's still going strong with no problems.

 

They allow the coolant to reach a higher pressure than the system is used to. On older cars that can highlight any developing weak spots by blowing them.

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i dont actually get what they do, to get water past 100 C you have to presurise it, so by letting it relieve at a higher pressure you are letting it get hotter ?, so the thermostat say opens at 82C so what is the point of presurising higher ?

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The higher the pressure in the system the more overhead, temperature wise you get, befor it will boil. The Group A Cossie Sierra race cars used to pre charge the coolant to about 40 PSI, so when a head gasket went they had a fair amount of temp overhead and a back pressure to help stop gasses entering the coolant. I'd say unless you NEED to run more coolant pressure run a stock cap. Old cars don't like sudden rises in coolant system pressure, and we all know old heater matrices are prone to failing.

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