Cooling Issues on Track, What is the solution?
#41
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I am looking at possibly participating in the SV Miata Challenge at ACS in mid November, about a month from now. I do not currently have the funds to upgrade to a TSE radiator as discussed previously. I would like to upgrade/replace my radiator cap with a Koyo 1.3 bar and add the lip/riser in from of my hood opening to help with heat evacuation.
I expect the weather at ACS next month to be considerably cooler than BRP in Sept when I was overheating. Thinking 70-80 degrees ambient. That would be 20-30 degrees cooler than BRP. What do you guys think my chances of overheating at ACS would be? I have never been to the track. Do I have a shot of not overheating with those long full throttle straights? Thanks.
I expect the weather at ACS next month to be considerably cooler than BRP in Sept when I was overheating. Thinking 70-80 degrees ambient. That would be 20-30 degrees cooler than BRP. What do you guys think my chances of overheating at ACS would be? I have never been to the track. Do I have a shot of not overheating with those long full throttle straights? Thanks.
#42
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See my post #30. Basically a sheet metal lip to kick air up as it passes over the hood at the opening behind the radiator. My understanding is that makes the pressure differential greater and extracts more heat.
#45
I'd assume so, ambient temps have a big impact. I once ran my Boss 302 on a 110 ambient temp summer day at the track and it went into limp mode due to overheating. the same car, on the same track with 95 ambient temps was fine to beat on all day turning similar lap times.
#46
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i don't think that is what he meant. i think he is asking if he had coolant temps of 220 on a 95-degree day and hits the track on a 75-degree day can he expect to run significantly cooler.
I'd assume so, ambient temps have a big impact. I once ran my Boss 302 on a 110 ambient temp summer day at the track and it went into limp mode due to overheating. the same car, on the same track with 95 ambient temps was fine to beat on all day turning similar lap times.
I'd assume so, ambient temps have a big impact. I once ran my Boss 302 on a 110 ambient temp summer day at the track and it went into limp mode due to overheating. the same car, on the same track with 95 ambient temps was fine to beat on all day turning similar lap times.
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So I went back and looked at post 30 and read what you have written. I am still confused on what exactly you are trying to do. Are you saying you are going to duct off from the bottom of the radiator all the way up to the vent and then all around? If so then I think that would well. If that is not what you are planning on doing, then I need a simpler explanation for my 5 year old brain.
#49
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So I went back and looked at post 30 and read what you have written. I am still confused on what exactly you are trying to do. Are you saying you are going to duct off from the bottom of the radiator all the way up to the vent and then all around? If so then I think that would well. If that is not what you are planning on doing, then I need a simpler explanation for my 5 year old brain.
End goal is to increase the delta in pressure from in front to behind the radiator. Higher the delta, more air passes through and more cooling is done. To a certain extent.
Run-on sentences over.
#52
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I am using the OEM cooling fan and shroud combination and will be using the same fan setup on the TSE radiator as long as everything fits. I aim to not have the fan be a big portion of my cooling at speed, only really need it to cool down when coming off of track and to work while driving to/from the rack track.
#53
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I believe conventional wisdom is that on track cars you do no want a fan shroud behind the radiator. I believe that they end up blocking more air then they let through. Honestly with the TSE radiator, proper ducting before it, and the undertray, you should not be having over heating issues.
#55
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Got the lip/riser added to the hood this weekend. Came out a little taller than I originally thought but it should do the job well. Man my car is looking more hoopty every day...
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Fans are for street cars, A/C function, and idling in the pits. They will not help when you are on track.
Theseus doesn't run a fan shroud, and neither does Rover. I don't understand why people continue to buy them.
Theseus doesn't run a fan shroud, and neither does Rover. I don't understand why people continue to buy them.
#58
When we tested shrouds several years ago we found they only improved pressure differential and engine temps a little when stationary. As soon as the was over about 20mph, they blocked flow even with fans on. Almost no OEMs use full coverage shrouds and you will never see one on a top level race car.
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+1
When we tested shrouds several years ago we found they only improved pressure differential and engine temps a little when stationary. As soon as the was over about 20mph, they blocked flow even with fans on. Almost no OEMs use full coverage shrouds and you will never see one on a top level race car.
When we tested shrouds several years ago we found they only improved pressure differential and engine temps a little when stationary. As soon as the was over about 20mph, they blocked flow even with fans on. Almost no OEMs use full coverage shrouds and you will never see one on a top level race car.
When I was overheating last time out, I lowered the temp at which the fan comes on to just have it running all the time basically. Thought it might be better to have the blades moving some air rather than just blocking airflow.
#60
Quick question on the subject of fans, when having some overheating issues, do you guys find that running the fan is better than having it off at speed? Or does the movement of the fan have a negative/negligible effect?
When I was overheating last time out, I lowered the temp at which the fan comes on to just have it running all the time basically. Thought it might be better to have the blades moving some air rather than just blocking airflow.
When I was overheating last time out, I lowered the temp at which the fan comes on to just have it running all the time basically. Thought it might be better to have the blades moving some air rather than just blocking airflow.
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