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The Terminator
Engine/Tuning
Mark 8 cooling fan upgrade
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<blockquote data-quote="MalcolmV8" data-source="post: 15387912" data-attributes="member: 8854"><p>My experience has been that cruising on the highway at speed does not cool as well as you'd think. I don't know if it's because of the air slip streaming around the car or why exactly it happens but it happens. I have only really noticed this in mid summer hot heat where your cooling system is taxed. In both my turbo Honda and the Cobra I observed hotter temps cruising on the highway. On the Honda's ECU you could control at what speeds the fan turned on and off. I had it set to shut off over 55 mph because logic told me the highway speeds will cool it just fine. The Honda BTW was running an unshrouded fan. Cruising at 70 mph in 95+ heat with the a/c the Honda would start to over heat. I'd exit to side roads and temps would come back in check as the fans did their thing. I adjusted the tune to keep the fans on to 90+ MPH and my cruising at 70 mph on highway was fixed. The fans are indeed very effective at highway speeds.</p><p></p><p>Now a couple weeks ago in the Cobra when it was super hot out and I was cruising around testing things I noticed the exact same thing. It would start to get overly warm on the highway but back road cruising was keeping somewhat in check. It led me to believe our cars shut the fans off at highway speeds but I don't know that for a fact yet. I don't see any speed control in the tune where I can adjust that either. This is going to take some testing and experimenting to figure out.</p><p></p><p></p><p></p><p>Yes I'm running E85 exclusively now with the high compression. Previously I used to switch back and forth between pump gas and E85 all the time and honestly I never saw the slightest bit of temp difference between the two. I think the engine is just to big and puts out to much power/heat to have any noticeable difference. Now on the turbo honda, which I used to daily, I did notice in the winter the temp gauge would be down lower on E85 than pump so what you're saying definitely has merit. But that motor was so tiny and its heat output was so little when cruising out of boost.</p><p></p><p>Yes I'm using the factory oil to water cooler. I had considered installing a remote air oil cooler but scrapped the plan once I started installing for a couple reasons. Number one was the complexity of piecing such a system together properly with a thermostat to allow oil to get up to working temps before diverting the bulk of the flow through the cooler. I actually purchased everything from Summit Racing and started the install. Such an abundance of connections, plus the remote oil filter, new block and connection for the coolant hoses etc. I could have made it work but honestly it added so much complexity and cost and I really didn't feel like I would be gaining a whole lot after speaking to guys with remote air oil coolers and what sort of temp differences they saw.</p><p></p><p>As for a thicker radiator, been there done that. Was not a fan. Maybe I should try again some day but when I tried it a few years ago my car actually ran hotter in general and especially in the hotter weather. I got a lot of feedback that I need to build better shrouding to force the air through the denser/thicker radiator, I needed a larger air dam below, more powerful fan to get the air through and a host of other reasons. Maybe my radiator just sucked, not sure. I went back to stock and it worked out much better.</p><p>Back in my V8 Ranger days the thicker radiators always did wonders so perhaps it was just something with the air flow in the Cobra.</p><p></p><p>No info or numbers yet. Need to get some seat time and will report back. Before installing the fan I just did the redneck flow bench test. Hold fans and hookup to battery lol. It was intense but I found the better fan <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> lol</p></blockquote><p></p>
[QUOTE="MalcolmV8, post: 15387912, member: 8854"] My experience has been that cruising on the highway at speed does not cool as well as you'd think. I don't know if it's because of the air slip streaming around the car or why exactly it happens but it happens. I have only really noticed this in mid summer hot heat where your cooling system is taxed. In both my turbo Honda and the Cobra I observed hotter temps cruising on the highway. On the Honda's ECU you could control at what speeds the fan turned on and off. I had it set to shut off over 55 mph because logic told me the highway speeds will cool it just fine. The Honda BTW was running an unshrouded fan. Cruising at 70 mph in 95+ heat with the a/c the Honda would start to over heat. I'd exit to side roads and temps would come back in check as the fans did their thing. I adjusted the tune to keep the fans on to 90+ MPH and my cruising at 70 mph on highway was fixed. The fans are indeed very effective at highway speeds. Now a couple weeks ago in the Cobra when it was super hot out and I was cruising around testing things I noticed the exact same thing. It would start to get overly warm on the highway but back road cruising was keeping somewhat in check. It led me to believe our cars shut the fans off at highway speeds but I don't know that for a fact yet. I don't see any speed control in the tune where I can adjust that either. This is going to take some testing and experimenting to figure out. Yes I'm running E85 exclusively now with the high compression. Previously I used to switch back and forth between pump gas and E85 all the time and honestly I never saw the slightest bit of temp difference between the two. I think the engine is just to big and puts out to much power/heat to have any noticeable difference. Now on the turbo honda, which I used to daily, I did notice in the winter the temp gauge would be down lower on E85 than pump so what you're saying definitely has merit. But that motor was so tiny and its heat output was so little when cruising out of boost. Yes I'm using the factory oil to water cooler. I had considered installing a remote air oil cooler but scrapped the plan once I started installing for a couple reasons. Number one was the complexity of piecing such a system together properly with a thermostat to allow oil to get up to working temps before diverting the bulk of the flow through the cooler. I actually purchased everything from Summit Racing and started the install. Such an abundance of connections, plus the remote oil filter, new block and connection for the coolant hoses etc. I could have made it work but honestly it added so much complexity and cost and I really didn't feel like I would be gaining a whole lot after speaking to guys with remote air oil coolers and what sort of temp differences they saw. As for a thicker radiator, been there done that. Was not a fan. Maybe I should try again some day but when I tried it a few years ago my car actually ran hotter in general and especially in the hotter weather. I got a lot of feedback that I need to build better shrouding to force the air through the denser/thicker radiator, I needed a larger air dam below, more powerful fan to get the air through and a host of other reasons. Maybe my radiator just sucked, not sure. I went back to stock and it worked out much better. Back in my V8 Ranger days the thicker radiators always did wonders so perhaps it was just something with the air flow in the Cobra. No info or numbers yet. Need to get some seat time and will report back. Before installing the fan I just did the redneck flow bench test. Hold fans and hookup to battery lol. It was intense but I found the better fan :) lol [/QUOTE]
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