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Old 12-05-2006, 03:18 AM   #1
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Default 25hrs at Thunderhill

My dad lives near Thunderhill raceway and saw the last few hours of the 25hr race. He said there were quite a few "Mazdas" up there. He's a Corvette man (owns 3, none run) so by Mazda, he means Miatas. He didn't tell me much about them so I don't know if they were FI or NA.

How doable would a turbo Miata be that can run 25 hours at near 100% power? What would the max hp be limited to? The temprature probably didn't go much above 50 and the humidity is probably didn't go below 60% (always fog in the valley in December).

Frank
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Old 12-05-2006, 05:18 PM   #2
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A turbo miata could easily swing that provided proper tuning and a driver that knew how to use the engine without fragging it. I won't even try to guess how much power you could run.
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Old 12-05-2006, 05:25 PM   #3
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Quote:
Originally Posted by arga View Post
My dad lives near Thunderhill raceway and saw the last few hours of the 25hr race. He said there were quite a few "Mazdas" up there. He's a Corvette man (owns 3, none run) so by Mazda, he means Miatas. He didn't tell me much about them so I don't know if they were FI or NA.

How doable would a turbo Miata be that can run 25 hours at near 100% power? What would the max hp be limited to? The temprature probably didn't go much above 50 and the humidity is probably didn't go below 60% (always fog in the valley in December).

Frank
I don't know that I would want to run 20 minutes at 100 percent power in a well-turbo'd Miata, unless it was on the salt flats. Still I don't think a 250-300 hp Miata would stay on the ground that long with faster gearing
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Old 12-05-2006, 07:39 PM   #4
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I think that the turbo miata would have to be pretty well sorted to last a 25 hour race with lots of attention to cooling, but it can be done.

FWIW, I ran my "shitty GReddy kit" (quote via jayc...haha ) at 15psi over 2 days with four 20+ minute sessions each day at a track day weekend without any major issues. I know braineack runs his at HPDEs too. Granted running at the track sure makes you track down all the "bugs" in your system, but it can definitely be done.
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Old 12-05-2006, 10:44 PM   #5
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Assuming stroked out to 2.0 liters and a dedicated racing set-up; I think 300hp should be possible. A NA race engine should be get 230hp. Cooling would seem to be the top issue but the cool weather should be a big help.

Obviously I'm completely talking out my *** here.
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Old 12-06-2006, 01:34 AM   #6
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i gathered... an NA miata has rarely if ever approached 230 hp.
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Old 12-06-2006, 02:43 AM   #7
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Well, I was extrapolating quite a bit. Keith, from FM, is claiming over 100hp per liter in his street worthy 1.6 Seven. I assumed that with race cams, no cat, no muffler and an 8k rev limiter that a 2.0 liter could make it that high. I guess the heads would become a bottleneck at some point even if heavily modified.

FM has flow numbers for their modified heads on their page. I imagine a theoretical max NA hp could be calculated but I don't know how.
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