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Old 02-19-2015, 04:53 AM   #1
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Default Mtuned not getting up to temp

I recently put in a MTuned reroute along with the new updated VH060650 36mm Koyo radiator on my 99 NB.

I've noticed that if I hop on the freeway before the car is fully warmed up, like say anywhere below 170*F the car will never go above that while on the freeway.

However, if I let the car get to around 190* before getting on the freeway, the car will sustain 188-195* while on the freeway.

I have a feeling it may be thermostat related, but I am not sure because the car will stay above 180* if the car is fully warmed up.

Any input?
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Old 02-19-2015, 08:35 AM   #2
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How long of a freeway drive are we talking in minutes? Five? Thirty? How cold is the ambient temperature?

Either way, it sounds like your thermostat is sticking open or something like that.
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Old 02-19-2015, 10:12 AM   #3
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Thermostat installed backwards?
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Old 02-19-2015, 12:09 PM   #4
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My commute to work is only about 10 to 15 minutes on the freeway, and it's been in the low 60's ambient. This morning the car stayed at a solid 168-170* while cruising until I hit a slight grade, then the temps increased to fluctuate between 174-177* (Per torque app)

However, when I first installed the reroute I had a 30 minute drive home and temps never exceeded 175* (upper low 60's, possibly high 50's ambient) Getting the car up to temperature has taken noticeably longer as well.
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Old 02-19-2015, 12:17 PM   #5
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Not enough detail about your install, but I know from experience that big radiator plus heater stream returning to radiator rather than to the mixing port will prevent reaching operating temperatures with outside temperature below 75F.
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Old 02-19-2015, 01:17 PM   #6
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It is the MTuned kit so I didn't bypass the heater stream to the mixing port as far as I am aware of.
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Old 02-19-2015, 01:52 PM   #7
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How large is the bypass/bleed hole in your thermostat? And is it clocked correctly at 12 o'clock?
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Old 02-19-2015, 02:34 PM   #8
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It still had the brass jiggler in it when I installed the thermostat. And I made sure it was positioned at the 12 o'clock position.

I did however buy the reroute off a good friend of mine, so I did not physically install the thermostat into the remote housing. He reported long warm up times, but he did not have any auxiliary gauges to measure temps.
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Old 02-19-2015, 02:37 PM   #9
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Quote:
Originally Posted by Caoboy View Post
when I installed the thermostat.

I did not physically install the thermostat into the remote housing.
Wait, you installed it, but you didn't install it?
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Old 02-19-2015, 02:53 PM   #10
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I think he means that he didn't install the thermostat but he could see it in there and positioned it correctly as best he can tell. Am I right?
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Old 02-19-2015, 02:58 PM   #11
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What temp thermostat do you have installed?
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Old 02-19-2015, 05:45 PM   #12
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Chiburbian got it right.

I was told it was purchased from 949 over a year ago. So I am unsure if it is a 180* or a 195* thermostat. I know Emilio currently sells them with a 195*, but I don't know if he's always sold them with the 195*.
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Old 02-19-2015, 06:10 PM   #13
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Your hole is too big.
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Old 02-19-2015, 06:59 PM   #14
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Most thermostats have the temp stamped on them.
I found this helpful when choosing a thermostat temp:
A newbie's adventures in racing: Should you run a thermostat in Spec Miata?
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Old 02-20-2015, 10:58 AM   #15
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Thanks for the tip. I guess I'll just order a new thermostat and gasket and see if that relieves anything
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Old 02-20-2015, 12:25 PM   #16
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Yea FWIW when I had the reroute with a trackspeed radiator, everything worked correctly if it was warm or if the car was idling, but freeway speeds on anything colder than a 60 degree day, I'd never reach operating temp. My radiator had some crazy ducting though.
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