Why are my water temps so damn high?
#1
Elite Member
Thread Starter
iTrader: (24)
Join Date: Dec 2007
Location: Carrollton TX
Posts: 1,709
Total Cats: 15
Why are my water temps so damn high?
Something's up with my water temp since boosting the car. I'm datalogging, and at highway speed it's running at 199* to 207* just cruising at 65mph, and that's on a cool day. Puttering around secondary roads, it's a few degrees higher.
I've bled the system til I'm crosseyed, run with and without a thermostat, and still the car runs hot. I haven't reinstalled the nose air guide or undertray yet. I know that's not helping me, but I don't know to what extent. I borrowed a coolant pressure tester from Advance Auto, and the system holds steady at 20psi. My radiator cap tested bad, so I bought a new one. I tested the thermostat in a pot of water on the stove, and it opens properly.
My setup:
MSPNP / MAF delete / RX7 550's
FM GT2560R kit with FMIC
Koyo 55mm radiator
New radiator cap
Dual Partzfinder 12" fans wired in parallel
New 180* thermostat with 1/8" bleed hole
New WP belt, verified tight
All external hoses replaced with new Mazda parts
80/20 water to coolant
The fans shouldn't even matter at highway speeds, but I have the Megasquirt programmed to turn them on at 190, so they're pretty much always running. Could my water pump be bad? I don't have any indication of a blown head gasket (no milky coolant or white exhaust smoke).
So what am I missing here?
C
I've bled the system til I'm crosseyed, run with and without a thermostat, and still the car runs hot. I haven't reinstalled the nose air guide or undertray yet. I know that's not helping me, but I don't know to what extent. I borrowed a coolant pressure tester from Advance Auto, and the system holds steady at 20psi. My radiator cap tested bad, so I bought a new one. I tested the thermostat in a pot of water on the stove, and it opens properly.
My setup:
MSPNP / MAF delete / RX7 550's
FM GT2560R kit with FMIC
Koyo 55mm radiator
New radiator cap
Dual Partzfinder 12" fans wired in parallel
New 180* thermostat with 1/8" bleed hole
New WP belt, verified tight
All external hoses replaced with new Mazda parts
80/20 water to coolant
The fans shouldn't even matter at highway speeds, but I have the Megasquirt programmed to turn them on at 190, so they're pretty much always running. Could my water pump be bad? I don't have any indication of a blown head gasket (no milky coolant or white exhaust smoke).
So what am I missing here?
C
#4
Cpt. Slow
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,360
Total Cats: 1,184
Indeed, put your under tray back on. What does your timing and fuel look like at those speeds? I know it's happening at slower speeds as well, but you could be running the engine a little hot with running too much timing and/or lean. If the system wasn't properly bled, your needle would be spiking up and down as air bubbles passed by the sensor, so I wouldn't worry about that. Also, it sounds stupid, but have you verified the fans are blowing in the correct direction?
#6
Elite Member
Thread Starter
iTrader: (24)
Join Date: Dec 2007
Location: Carrollton TX
Posts: 1,709
Total Cats: 15
Ok, that'll be my next step. I was afraid someone would say that. Trimming it to clear the intercooler piping looks like a PITA.
Timing isn't tuned yet, and I'm at around 12:1 or 13:1 while cruising. Already checked the fan direction, they're good.
You kid, right?
C
Indeed, put your under tray back on. What does your timing and fuel look like at those speeds? I know it's happening at slower speeds as well, but you could be running the engine a little hot with running too much timing and/or lean. If the system wasn't properly bled, your needle would be spiking up and down as air bubbles passed by the sensor, so I wouldn't worry about that. Also, it sounds stupid, but have you verified the fans are blowing in the correct direction?
You kid, right?
C
#11
Elite Member
Thread Starter
iTrader: (24)
Join Date: Dec 2007
Location: Carrollton TX
Posts: 1,709
Total Cats: 15
Alrighty then, I'll keep my fingers crossed that the ducting and undertray solve it. I built this with the intention of doing tracks days, so unless this gets fixed, my SE-R will keep having all the fun.
C
C
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