Originally Posted by comradefks
(Post 942017)
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. |
Originally Posted by shuiend
(Post 942021)
Explain what that is? Are you talking about raising the rear of the hood and hoping that it extracts heat?
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Anybody?
How does a 20 degree drop in ambient temps relate to coolant temps? Thanks. |
Originally Posted by comradefks
(Post 942556)
Anybody?
How does a 20 degree drop in ambient temps relate to coolant temps? Thanks. 155 -> 135 with a 190 degree t-stat is probably drastically different than 80 -> 60 with a 160 degree t-stat. |
Originally Posted by SJP0tato
(Post 942872)
Depends on the placement of the range of 20 degrees compared to the target temp of the thermostat.
155 -> 135 with a 190 degree t-stat is probably drastically different than 80 -> 60 with a 160 degree t-stat. 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. |
Originally Posted by shanem
(Post 942880)
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. |
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.
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Whatever you do, do not duct the front of the radiator and add an extractor in front of the hood-hump. Everyone is lying about the effectiveness. Only you have absolute truth.
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Originally Posted by shuiend
(Post 942913)
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. |
Got lucky! Found a used TSE radiator that I could get the money together for. In the mail already and should be getting installed on the car next weekend. Stoked!
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Do you have a fan shroud around the radiator? In order for an electric fan to cool properly you must run a fan shroud
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Originally Posted by Slidinmiata
(Post 946502)
Do you have a fan shroud around the radiator? In order for an electric fan to cool properly you must run a fan shroud
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Originally Posted by Slidinmiata
(Post 946502)
Do you have a fan shroud around the radiator? In order for an electric fan to cool properly you must run a fan shroud
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Originally Posted by shuiend
(Post 946810)
Honestly with the TSE radiator, proper ducting before it, and the undertray, you should not be having over heating issues.
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1 Attachment(s)
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...
https://www.miataturbo.net/attachmen...ine=1352149117 |
Thanks for posting those pics Hustler. Your ducting looks almost identical to mine, except for the oil cooler hole and the fact that yours is made out of plastic instead of Aluminum.
Were did you get the plastic? |
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. |
Originally Posted by Savington
(Post 946861)
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. 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. |
Originally Posted by emilio700
(Post 947001)
+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 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. |
Originally Posted by comradefks
(Post 947043)
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. |
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