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Hmmm... My cooling system appears to be a bit more efficient than yours, for whatever reason. I just found an ~80F session for comparison, and my coolant temp peaks at 212F, and nominal is about 206F.
Track configuration also plays a role. I see about 10F increase between the fast, sweeping 4.2km track at Mont-Tremblant and a twisty, small 2nd-3rd gear 1.2km track at Saint-Eustache. The small, slow one is hotter.
So I'd factor average speed into the equation.
FWIW on the faster track in 80F-ish ambient my temps are closer to Steve's. 212F peak, just about. Mods are in the signature.
Yeah, and the 3 graphs I posted are all from different track configurations, so apples to socket wrenches. The last one is a 1.3 mile track that is brutal in terms of brake and coolant temps, so it is actually a worst case scenario.
Aside from the Koyo, what else have you done to your cooling system? I could probably do a better foam job on my radiator and I haven't cleaned out my condenser in a while (okay, ever. It's probably clogged up with bugs). I'm in the (slow) process of relocating my battery to the trunk in the hopes that it will improve airflow some.
I'm tempted to swap my OE water pump back in to see how things change. I'll have to come up with a method of correcting for ambient temperatures.
I would expect that braking zones are good for cooling while long straights increase the thermal stress on the system.
Last edited by NotAPreppie; 07-18-2017 at 12:23 PM.
I don't track my car, but I know for my street application my vented hood makes a BIG difference. I took it off because when I had all the stock, aero I wasn't a huge fan of the look, but now that I have all MS aero I am going to pop it back on this weekend and see how I feel. I'll see how much of a difference I notice with cooling again.
Anyways, hoods are super easy to swap out so even if you didn't like it for DD you could just slap it on for track use.
Last edited by RotaryMachineRx; 07-18-2017 at 01:58 PM.
Aside from the Koyo, what else have you done to your cooling system? I could probably do a better foam job on my radiator and I haven't cleaned out my condenser in a while (okay, ever. It's probably clogged up with bugs). I'm in the (slow) process of relocating my battery to the trunk in the hopes that it will improve airflow some.
I'm tempted to swap my OE water pump back in to see how things change. I'll have to come up with a method of correcting for ambient temperatures.
I would expect that braking zones are good for cooling while long straights increase the thermal stress on the system.
Aside from the Koyo, I have done basically nothing. My coolant mixture is roughly 70% water and 30% glycol, and I sealed 3 sides of the radiator with foam. That's it.
I wish we could somehow manage a head-to-head competition between the Koyo and CSF. Both are good brands that make quality products. It would be interesting to see which one performs better. But... I have an S2 and all that goes along with that, and the Koyo that fits the S1 is a different design than mine.
Curious about how much coolant temp might follow behavior on the track, I graphed a couple of laps on a 70F morning. The coolant temp rises steadily, until it reaches stasis and levels off. It doesn't track with RPM at all on a micro level. You can see it drop a few degrees, where I probably caught traffic and put less load on the engine, so it does track with RPM on a macro level.
Last edited by Steve Dallas; 07-19-2017 at 07:14 AM.
Stock thermostat starts opening at 82C and is fully open at 95C. Bought the Mishimoto racing thermostat, fully open at 89C. Amazing difference. Yesterday on the track I was peaking at 94C in the corners, that doesn't rly bother me, what bothered me was when I braked into the corner the radiator couldn't keep up as the temperature rose. Now since it's fully open from 89C, when I brake into the corner the temperature peaks at 94C and that's constant high rpm driving.
The next problem of course is when I drive from the track into the pits and stop, then the temperatures start to rise until the fans start, so next thing I'm gonna do is a fan switch, just to manually start the fan when stopping. Cheers
Hello kerrboiii
Glad to hear that your thermostat has been helping keep your vehicle cool! If you ever have questions or concerns about your vehicle, feel free to contact us. We are always here to help. I hope you have a great day!
I wonder how much value there might be in lowering oil temps? I'm not sure I'm game to risk $150 on buying the lower temp oil thermostats, myself to find out, though. My guess is, lower oil temps would affect coolant temps by 2 or 3 degrees max, but that could be worth it to some people, who are flirting with the limit.
Again though, opening the oil thermostat is good at first but once you are "flirting with the limit" you are well above the open/close point of that thermostat anyways no?
One thing I REALLY need to do, is pull my bumper off and straighten out all the fins on both my coolers and rad..... they're pretty mangled
Installed my vented hood again this weekend. Although I don't have any fancy graphs or logged data to offer I will state my observations.
Drove 400km's mainly all highway to the cabin with my stock hood on. Ambient temperature was approx 25C (77F). Coolant temps on the trip ranged from 198F to 207F.
Swapped to my vented hood and drove home after the weekend (same route) with ambient temp at approx 29C (84F). Coolant temps ranged from 190F to 198F. This was on a hotter day and with my IC/Rad/Oil coolers absolutely covered in bugs from the 400km trip up to the lake.
The big thing I noticed was that when at a stop (there was a few stops due to road construction and city traffic) my coolant temperatures never climbed over 198F where typically in traffic I would see it climb as high as 210F.
Anyways, take it for what it is, a very un-scientific observation; don't think it's any big news that vented hoods help with cooling!
Last edited by RotaryMachineRx; 07-25-2017 at 12:32 PM.
This was on the south course at Autobahn Country Club in roughly 85°F ambient temperatures. It was a cloudless day and dead calm so temperatures on the track were probably at least 5-10°F higher. I never got around to swapping my OEM water pump back in but did get my battery relocated to the trunk. Everything else was the same as my previous chart. Intake temps bottomed out at around 93°F.
Last edited by NotAPreppie; 07-31-2017 at 08:09 AM.
This was on the south course at Autobahn Country Club in roughly 85°F ambient temperatures. It was a cloudless day and dead calm so temperatures on the track were probably at least 5-10°F higher. I never got around to swapping my OEM water pump back in but did get my battery relocated to the trunk. Everything else was the same as my previous chart. Intake temps bottomed out at around 93°F.
Is an aftermaket water pump a huge difference? Cheers.
It will cause more harm for them to be off than on. When on any extra pressure coming into the fan is compounded on the discharge. If the fan isn't running then the blades are inhibiting flow.
However, I thought you posted in a different thread a while back that you verified the fans stay on regardless of speed?
Originally Posted by Brettus
you can set the high speed fans to stay on up to whatever speed you want . Probably somewhere around 60mph . Would be pointless above that I'm guessing .
Anyone experimented with this or any other means of keeping the fans on ?
Trying to remember ........I'm pretty sure I found that the LOW SPEED fans stay on no matter what speed you are at (once you are over the set temp ) . However I later learned , after a heated argument on the Purely site, that the HIGH SPEED fans actually turn off dependent on that adjustable speed setting in the ECU .
I have organised a test ,in a month or so,with a a couple of race car rx8s to do some tests to see at what speed this ceases to become beneficial. I want to find a setting that works for the pro7 race cars i work with.
I saw a test for brake ducts with an inline fan in the hose where it was beneficial to have the fan running all the way up to the 170 mph max speed they ran at
When you compound two turbos, i.e. put the discharge of the first one into the inlet of the second one, does the second turbo disrupt and inhibit the flow of the first one or does it compound that flow to 2x the pressure?
You will always get more flow with the fan on than off. The faster you run it (within the design efficiency tange) the more it will flow. It's using alternator power then too, which will impact gas mileage. If they cut it back that'd likely be the reason why. It might explain a few other things too.
My highway cruise temps, with air conditioning on, went down 10 degrees. 5 when I installed one, the other 5 with the second one. Track temps are down as well, especially at speed. Slower tracks less so.
Since I got my oil temperature gauge (sampling on the return line to engine from passenger side oil cooler) I have remarked that oil temperature always trails the water temperature. With ridiculous 110 F ambient temps lately, the water temperature reaches the critical range (220F - 230F) before the oil, at least in mountain highway driving. Also I noticed that the oil coolers are capable of overcooling even in the summer when coasting down a long hill. Maybe on a track water/oil temps behave differently, but to me this indicates that one would be better off attacking water temperature directly.
Since I got my oil temperature gauge (sampling on the return line to engine from passenger side oil cooler) I have remarked that oil temperature always trails the water temperature. With ridiculous 110 F ambient temps lately, the water temperature reaches the critical range (220F - 230F) before the oil, at least in mountain highway driving. Also I noticed that the oil coolers are capable of overcooling even in the summer when coasting down a long hill. Maybe on a track water/oil temps behave differently, but to me this indicates that one would be better off attacking water temperature directly.
been saying that for years . I run an extra water radiator instead of the second oil cooler . Works great !
07-18-2017, 10:51 AM
. I run an extra water radiator instead of the second oil cooler . Works great !
