Miata cooling system thread
#301
Thanks guys. Pretty much what I was thinking too. I'm going to start looking for an MSM rad and keeping a close eye on the gauge (I have been ever since my "discovery"). I'd upgrade to something nice, but the car see's such short bursts of WOT that it'd probably just be a waste of money.
It's a nice radiator too, it's not junk especially for the price.
#302
I’ll share my experience. PO did the same thing to me, 16mm radiator, didn’t notice until I overheated bad one morning last summer. I replaced it with a 37mm koyo. I run 80% water, 20% coolant. Both my fans work. On 100°F+ days I have to turn the AC off on my drive home. What really kills me, for whatever reason, is a 3 mile slightly uphill section. The grade isn’t posted because it’s small enough to be insignificant. That uphill section sends my temps from 207 up to 220 in a heart beat. I nearly always end that stretch with the windows down and heater on. My MSM has an intake, and the boost turned to 9psi, that’s really it for power mods. It’s the dumb FM hot air intake though. I’m working on fixing that. Currently I’ll see IAT’s that are consistently 45 degrees above ambient :-/
My personal plan is to replace the OEM fan and shroud with my own shroud and SPAL fans that flow a lot more air, and then to do some good ducting whenever I have the bumper off next. I have a hood vent right behind the radiator and sealed between the fan shroud and radiator using aluminum tape.
I’d recommend upgrading the radiator, I’ve never had a car that was just begging to overheat the way this one does. I use torque on my phone to keep an eye on it, but I also did the linear temp gauge mod just to be sure I had more visual indication.
My personal plan is to replace the OEM fan and shroud with my own shroud and SPAL fans that flow a lot more air, and then to do some good ducting whenever I have the bumper off next. I have a hood vent right behind the radiator and sealed between the fan shroud and radiator using aluminum tape.
I’d recommend upgrading the radiator, I’ve never had a car that was just begging to overheat the way this one does. I use torque on my phone to keep an eye on it, but I also did the linear temp gauge mod just to be sure I had more visual indication.
#304
SADFab Destructive Testing Engineer
iTrader: (5)
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 18,642
Total Cats: 1,866
<p>Humming we covered this in your build thread on cr.net. Ducting ducting ducting ducting. Shroud will help when you are stopped in traffic, but that uphill section is just begging for ducting. A shroud might even slow air down.</p>
#305
I know, but the problem is I'll still get to 215 stuck at red lights and such. I'm going to add in a switch to be able to put the fans to full throttle manually. The ducting will come eventually as well, just not quite yet. I need to finish designing the shroud though. I still think more fan will solve my issue because I have several examples of more fan solving cooling issues, and not as many for the ducting. That's probably because more people go the fan route than the ducting, but given my limited down time for the car, ducting will need to wait until I have a 2nd car.
#311
Hi guys, ive read 16 pages of this but am still unsure if what i am looking for is achievable. I live in an area of 90% humidity, 100 ambient temps and 150 track surface temps. A friend with an fm2 kit (270 whp) and a 50mm radiator + 1inch vented bonnet couldnt last more than 15 minutes. Indeed. Thus far few road going turbocharged cars could do better under grueling track conditions. The issue seems to be the air conditioning exchange core. (We cant live without it after all)Has anyone in the sand states achieve a sustainable cooling ssytem? Ive started with trackspeeds 76 mm radiator but have yet to embark on the rest of the project to turbocharge the car.
Last edited by Miata2100; 06-04-2015 at 11:02 AM.
#312
That humidity is good for cars but bad for people. And be glad that you're not at high altitude
We've got prototype electric water pump setups going out to a couple of testers as well as on a car here. It worked very well on an NC, now we'll see how it works on the NB. We redesigned the flow for the entire system, even taking the turbo coolant into effect. No hot water gets recycled into the engine, it all goes through the rad.
We've got prototype electric water pump setups going out to a couple of testers as well as on a car here. It worked very well on an NC, now we'll see how it works on the NB. We redesigned the flow for the entire system, even taking the turbo coolant into effect. No hot water gets recycled into the engine, it all goes through the rad.
#313
Hi guys, ive read 16 pages of this but am still unsure if what i am looking for is achievable. I live in an area of 90% humidity, 100 ambient temps and 150 track surface temps. A friend with an fm2 kit (270 whp) and a 50mm radiator + 1inch vented bonnet couldnt last more than 15 minutes. Indeed. Thus far few road going turbocharged cars could do better. The issue seems to be the air conditioning exchange core. (We cant live without it after all)Has anyone in the sand states achieve a sustainable cooling ssytem? Ive started with trackspeeds 76 mm radiator but have yet to embark on the rest of the project to turbocharge the car.
Just do everything you can:
-big radiator
-run distilled water and water wetter
-seal air flow around radiator
-coolant reroute (with appropriate head gasket)
-new/recent water pump
-Vented hood (if needed)
-A/C delete (if needed)
Not much else you can do... maybe Keith's electric coolant pump
#314
Hi guys, ive read 16 pages of this but am still unsure if what i am looking for is achievable. I live in an area of 90% humidity, 100 ambient temps and 150 track surface temps. A friend with an fm2 kit (270 whp) and a 50mm radiator + 1inch vented bonnet couldnt last more than 15 minutes. Indeed. Thus far few road going turbocharged cars could do better. The issue seems to be the air conditioning exchange core. (We cant live without it after all)Has anyone in the sand states achieve a sustainable cooling ssytem? Ive started with trackspeeds 76 mm radiator but have yet to embark on the rest of the project to turbocharge the car.
FM's airflow kit will be a tremendous help based on what I've seen from others. I'm building my own, hope it gives me the added cooling I need. If not, ducting and a larger radiator is probably next up after that.
#317
Fans and good shrouding made a significant difference to one of my cars at a steady 75 mph.
#318
No, most of that 100 mph goes around the nose of the car. Very little of it goes through the rad due to the high pressure stacked up behind the radiator. It would be interesting to measure speed, although the mass of the air would be a more important measurement. Fun experiment: get some big fans blowing over the front of your car, then see if you can spray water on the radiator (or IC, or AC condensor, whatever is leading the charge).
Fans and good shrouding made a significant difference to one of my cars at a steady 75 mph.
Fans and good shrouding made a significant difference to one of my cars at a steady 75 mph.
This was my experience as well with my MSM. I'm sure Keith remembers this well as it involved a couple panicked emails as my the garbage fans that came with my radiator started to let the car overheat on the highway somewhere in the middle of Kansas, but would keep perfectly acceptable temps at idle/in traffic for hours at a time.
All fixed with an FM Stage 1 Airflow kit.
Sounded completely backwards to me at the time as well. I ran my MX6 with NO FANS for 2 years, and it did the opposite. Overheated in traffic, ran cool on the highway. And yes, i argued with Keith and Jeremy about it in person, too.
#319
I'm now adding a big Fab9 intercooler to the car. It really blocks that mouth. I expect to be struggling with cooling a bit until I find the right combination.
#320
My Silver car, which I've been running with WI and no IC, behaved exactly like your MX6. Ran it with a reroute, OEM automatic radiator, OEM air guide/undertray and OEM fans (both fans although the AC fan would stay off unless the AC was on). Not only did it run cool on the highway, it also ran cool on track. But God help you if you got stuck in a traffic jam in 100F+ weather with the AC turned on. So, my experience with that car contradicts what Keith is saying -- at least in the case where an intercooler is not present.
I'm now adding a big Fab9 intercooler to the car. It really blocks that mouth. I expect to be struggling with cooling a bit until I find the right combination.
I'm now adding a big Fab9 intercooler to the car. It really blocks that mouth. I expect to be struggling with cooling a bit until I find the right combination.
I dunno. One of the reasons i'm glad i'm not messing with a turbo BP Miata anymore.