My friends Rx7 3rd gen if ran hard for say 30 minutes or just ran for a couple of hours its temperatue gage reaches as much as 90 to 100celsius. If i turn the car off at this point it will jump as much as 20celsius. Is this normal in RX7 or is their something wrong.

 

On a FD 100C or 212F isnt that uncommon, search FD Fan Mod

 

normal. Fan mod is essential along with bigger radiator if you don't already have. Vented hood helped me a lot in florida heat

 

half the motor is aluminum casting and some it iron casting so the two metals heat and cool at different tempitures causing it to over heat i was told

 

ya i think a radiator and vented hood would probably do the trick