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cooling options

2K views 22 replies 17 participants last post by  Inertiadrifter4 
#1 ·
so i went to the track for the first time, and notice my water temp would gradually go up to hot ( near the H) after 3 or 4 laps. i have 2001 miata, and i was wondering what i should do, get the coolant reroute? or koyo radiator 37 core thickness? they are around the same price.
 
#4 ·
0: verify splash pan is still installed
0.1: verify fans are working.

1: flush out ancient fluid and replace with fresh 80/20 water/coolant.
1.1: burp radiator.

2: consider a new thermostat. I like 180* models from napa.

3: new radiator. The new FM cross flow is pretty sweet looking. Godspeed is proven. I love my Koyo.
4: Mouth shrouding.

5: new fans.
 
#6 ·
I rock a Koyo 37mm radiator and never have problems with overheating at the track, so it's definitely sufficient...

However, I will say that the 2 motors I got from people on here to play around with and rebuild both had failures in cylinder 4, which is definitely bumping that coolant reroute up high on my list of priorities.
 
#12 ·
Flush fluid
Replace t-stat
Run distilled water, a bottle of water wetter and about 2-3 cups of coolant (just for lubication for the water pump). Since you're in southern california, you need not worry about a high concentration of antifreeze.


Mazda reconfigured the headgasket on 01-05, no reroute needed (unless doing a dual t-stat system).
There could be many issues causing over heating- fan failure, bad t-stat, clogged radiator, cavitated water pump (higher milage cars/old water pumps), oxidized/rusty coolant ...among other things.
 
#14 ·
A 180 starts to open at 180 and is fully open by 200ish. A 195 starts to open at 195 and is fully open by 210ish. So yes, it will still get warm. You're just decreasing the lowest temp the system will see from 195 down to 180.

If you lived somewhere that got really cold in the winter, it might take you an extra mile to get warm air out of your heater.
 
#15 ·
Having a lower temp t-stat doesn't mean the car will always operate at those temps, it's jsut th emin. temp before it opens. You ECU is still programmed to crank the fans up at xxx*F. It is possible to get coolant down to that 'min temp' when crusing in cool/cold temps. I run a 180*..it's safe.
 
#16 ·
hood risers.. people will say otherwise and that they look ugly or whatever, but they ARE in fact functional and will help your car run a little cooler.
 
#17 ·
^ I think hood risers only help under hood temps and cooling your car off while your at a stand still in traffic... the rubber grommet at the back of the engine bay to seal the gap between the hood and firewall is there for a reason... you ram air through the rad past the engine and down underneath the car at speed...

my .02 cents, but someone correct me if im wrong.
 
#23 ·
Attention 01-05 owners: Mazda changed the head gasket design for these years to restrict flow to the #1 cylinder. Not a real fix but it does allow the 01-05 to run a tiny bit cooler than the previous years. Because of this change however, the reroute could cause uneven cylinder head temps, even while improving overall cooling. For this reason, M-Tuned recommends using the 94-00 head gasket (BP26-10-271) if installing the reroute on an 01-05 USDM Miata.

sorce: http://949racing.com/miata-coolant-reroute-system.aspx
 
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