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Old 09-07-2012, 11:13 AM   #1
guitarsurgeon
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Member#: 290509
Join Date: Aug 2011
Default Overheating <3k rpm Normal <4k rpm?????

dont know how to edit title.... overheats below 3k and is fine above.
My car is currently overheating under 3k rpm. anything above that it is fine. What could be the issue? It will do this at the same speed 70ish mph, in 6th gear 2800rpm it over heats, 5th 3500 is fine. Now for what I have. It is a sleeved and o-ringed sti 2.5 liter with oem head gaskets 5k miles old, all were copper coated before assembly. The car is pushing 27 psi with a gt35, arp head studs, oem water pump and thermostat. It does not seem to be pushing coolant, if it is it is only slightly because i cant notice. Upon this problem i let the car sit over night and noticed my coolant to be a water bottle or so low. I dont know how that could happen I dont see coolant getting burned or anything. Anyway let me knnow what it could be before I tear it apart and do the head gaskets.
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Last edited by guitarsurgeon; 09-07-2012 at 12:25 PM.
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Old 09-07-2012, 11:56 AM   #2
mechatricity
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Chapter/Region: TXIC
Location: Dallas, TX
Vehicle:
2006 WRX Wagon
2004 WRX Wagon

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I just read another thread somewhere here from someone with a built motor, also overheating and eating coolant. might get better input from the built motor forum, but it sounds like the thermostat could be acting up
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Old 10-03-2012, 07:51 PM   #3
suppersppy
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I would also guess the thermostat. It's probably some kind of warmup thing that kicks off over 4k.
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