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| Overheating troubles |
Subject: Overheating troubles
by RippDatsun on 2018/3/11 9:25:20
Can anyone tell me... if you measure the voltage from the temperature sender wire to ground, do you read a steady voltage with key ON?
I get 10v for 5-10 seconds after turning key to ON, and then it will rapidly change between 10 and 2-3v. Is this normal? The internal regulator regulating? Should it be 11-12v? I need to rule out my temperature gauge/sender as I have replaced everything except water pump which is on its way.
If you care, some more info:
I have recently installed a blow through turbo that is plumbed in parallel to the heater core (teed off at heater outlet, teed into heater return line).
Before turbo car used to idle slightly above half way (although it has seemed to progressively become warmer over the years. A timing bump at one stage helped it drop a little). Now it is reading 3/4 or more and rises quickly to H line when driving/cruising off boost. Radiator is a brand new aluminium 3 row. Replaced thermostat with new 82 Celsius fail-safe (old one was fine though). Block has been water flushed.
Running 6-7 PSI and have timing set at 10 initial + 15 mechanical by ~3k RPM + ~15 manifold vacuum adv. When I first installed the turbo I had 5 initial + 15 mechanical and no vacuum and it seemed to run cooler and didn't get to the H. One short drive it did, popped the cap with it running still and didn't see any flow. Heater hoses felt empty, think that time it was an air lock as I checked after idling the next day and it was flowing again. After that I added the vacuum advance giving 26 degrees advance at idle and made no difference to when it was running 5-10, if anything it seems to run warmer.
I Am still in the process of tuning but AFR mixtures are relatively good already but haven't been brave enough to drive it far with it running so warm.
Problem seems to be getting worse gradually so I now suspect water pump. Removed it today and its pretty lumpy but still in one piece and spinning. The last few checks of the flow across the radiator seemed slow though. Have a replacement on the way.
I am hoping that will fix it.
Otherwise I am thinking maybe lower radiator hose is sucking closed a bit. Or I have failed with the set up and it is just circulating hot coolant through the turbo over and over and reducing the flow through the radiator? Maybe blown a HG already?
Does your turbo engine run warmer than it did stock (just cruising, idle etc.)?
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