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Better to have a slighty smaller intercooler than an overheating engine... but if you must keep this setup I suggest:
Fit some foam between the intercooler and radiator cores, so that air flowing thru the intercooler is forced thru the radiator as well OR use some alloy or plastic and attach to the radiator so that it forms a 'shroud' that joins to back of intercooler and directs ALL of the air coming out of the intercooler thru the radiator.
Hope that makes sense, otherwise I might be able to post links to pics of what I mean.
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i understand what you mean, i have thought of doing this already although i dont see it making all that much difference.
its not essentially overheating, like boiling or anything like that, i mean if i was going by the factory temp gauge like most people do i wouldnt even have noticed the change in temp so its just that it is running hotter than it really should be.
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I think this will make your cooling system much more effective with a larger amount of airflow thru the radiator. Even setting up a chilled(ice or dry ice) water spray onto intercooler/radiator would increase cooling efficiency.
Of course, as you say it is 10degrees... lot of effort but it is probably raising under bonnet temperature causing other side effects.
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just out of interest, where is the temp sensor of your digital reader located?
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on the thermostat housing