996CTSR race build....
09-12-2022 | 06:30 PM
#136
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My old spring rates were 1700 lbs front and 2000 lbs rear. We bumped up the rears to slightly to 2100 and left the fronts the same. The weight of the car is going to be 300 lbs less at around 2750 so the 1700/2100 should work well.
09-12-2022 | 10:19 PM
#137
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That's a solid approach; tune it first, then modify so the baseline saves a lot of time with the new heads - cannot even imagine how tricky it would be to tune a variable cam, outside of simply setting the points where it comes on, then off. Is there an expected power bump (%) to going to 8500rpm with those heads? Which cams are you using?
That is a rock solid idle.
That is a rock solid idle.
The two resonance flaps on the GT3/Cup intake will be where the work is going to be. The heads have substantially larger valves and will flow better. We will likely use 8000-8200 as a redline depending on gear for longevity reasons. 7.1GT3 cams will be used. Currently we are using Schrick Motorsport cams on our current heads.
Last edited by powdrhound; 09-12-2022 at 10:22 PM.
09-13-2022 | 04:26 AM
#138
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The front consists of a large flat bottom full carbon splitter, almost 1" thick. It bolts to the subframes on the car. The rear has a 72" wing with a 13" chord. There is a also a provision for a small secondary wing for more downforce.
This is the company that designed the aero for the car. They are local to me and work with many race teams across many segment of motorsport from NASA to IMSA. They design an aero package for each individual application. The package they designed will bring about 1000 lbs of downforce to the car.
https://www.zebulonmsc.com/#page-top
This is the company that designed the aero for the car. They are local to me and work with many race teams across many segment of motorsport from NASA to IMSA. They design an aero package for each individual application. The package they designed will bring about 1000 lbs of downforce to the car.
https://www.zebulonmsc.com/#page-top
At what speed will it give 1000lb of downforce?
MVH Erik Wedlund
09-13-2022 | 04:45 AM
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09-13-2022 | 05:01 AM
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09-13-2022 | 12:27 PM
#143
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Will it be harder on the rubber as well?
09-13-2022 | 01:37 PM
#144
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Its relevent regardless of power level, but if you want to be fast on a track, its all about balancing aero and power.
Yes it will, more aero = more grip and power = more wear,
MVH Erik Wedlund
09-13-2022 | 03:07 PM
#145
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Yes, increase downforce will always come at the expense of increased drag. The CAD designed wing is a much more efficient airfoil with a higher L/D ratio but the wing at max lift (downforce) will still result in sizable drag. With 800whp the drag is much less of a concern than it would be on a low hp car. Greater downforce = greater minimum speed in turns = greater tire wear = lower lap times. There is no free lunch....
09-13-2022 | 03:47 PM
#146
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It will be interesting to see how much 'free lunch' you are giving up with respect to tyre use - an extra 1000lbs on them brings you back up to just over OEM weight if my math is correct.
Realistically though, on slower corners, how many MPH will you gain with that aero, 5, 10, 15 mph? The longer sweepers should be considerably higher.
Realistically though, on slower corners, how many MPH will you gain with that aero, 5, 10, 15 mph? The longer sweepers should be considerably higher.
09-13-2022 | 04:07 PM
#147
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It will be interesting to see how much 'free lunch' you are giving up with respect to tyre use - an extra 1000lbs on them brings you back up to just over OEM weight if my math is correct.
Realistically though, on slower corners, how many MPH will you gain with that aero, 5, 10, 15 mph? The longer sweepers should be considerably higher.
Realistically though, on slower corners, how many MPH will you gain with that aero, 5, 10, 15 mph? The longer sweepers should be considerably higher.
Last edited by powdrhound; 09-13-2022 at 04:10 PM.
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moburki (09-22-2022)
09-13-2022 | 05:32 PM
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