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Tracking / Autocross / HPDE / Drifting What these cars were built for!


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Old 03-14-2019, 05:38 PM   #15
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Was the exhaust flow out of and over the hood ever factored into the Fluent models?
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Old 03-15-2019, 04:55 PM   #16
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Was the exhaust flow out of and over the hood ever factored into the Fluent models?

The exhaust flow was not modeled into the Fluent cases. There were a few reasons for this. First, this was a quick build so not a whole lot of development went into it. We only had a week for CFD development and the majority of that went into refining some of our best practices and yaw and ride height sensitivities. Given more time, that is something that we would look into. The issue is that the mass flow out of the exhaust would be steady and would be hard to estimate this flow given all situations. We would probably run it at the max flow rate, mid, and none to see how this would affect the results. I would assume this would cause the body of the care more lift. Not sure on its effects on the rear wing.
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Old 03-18-2019, 09:06 PM   #17
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Episode 6 was posted on Friday:

Thanks,
Eric
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Old 03-31-2019, 12:01 PM   #18
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Episode 7: Cooling system work and cutting of the trunk to fit the uprights.

https://youtu.be/eLcrKP6d484

Episode 8: Received the dual element wing which is our own custom profile that works extremely well with our 300mm wing profile. We go over ducting of the cooling system in further detail and we begin bonding the front splitter.

Let us know if you have any questions .

Thanks,
Eric
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Old 04-10-2019, 10:10 PM   #19
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Episode 9 is out! We show a lot of the front splitter being built and begin working on the flat underbody panels.

https://youtu.be/HnkH8rLF60s


Picture of the flat underbody.

We are getting close to finishing all the small odds and ends. Probably 3-4 more videos before the car is finished.

Eric
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Old 04-13-2019, 07:18 PM   #20
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Episode 9 is out! We show a lot of the front splitter being built and begin working on the flat underbody panels.

https://youtu.be/HnkH8rLF60s


Picture of the flat underbody.

We are getting close to finishing all the small odds and ends. Probably 3-4 more videos before the car is finished.

Flat
FLAT BOTTOM CARS YOU MAKE THE RACING WORLD GO ROUND!!!
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Old 04-13-2019, 10:31 PM   #21
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Episode 3 is out! We talk a bit about the cooling system, the CFD CAD model, and CFD.

https://www.youtube.com/watch?v=8vlu3bNI-zk&t=5s
How do you guys deal with the engine bay interior? Is it assumed solid or is there a way to simulate flow through the radiator and out the vents? Or is it accurate in the solid model and CFD?
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Old 04-14-2019, 09:50 AM   #22
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How do you guys deal with the engine bay interior? Is it assumed solid or is there a way to simulate flow through the radiator and out the vents? Or is it accurate in the solid model and CFD?
Engine bay we do not simulate. We will simulate heat exchanger stacks at times when it would affect items we are looking into. We did not simulate the stacks in this case as it would have been difficult. We do not have pressure drop data for the intercooler. We have the pressure drop data from the rad and could get it with the OC. If it had ducting out the hood and not into the engine bay, we might have simulated it (if we had data for the intercooler).
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Old 04-14-2019, 10:40 AM   #23
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Engine bay we do not simulate. We will simulate heat exchanger stacks at times when it would affect items we are looking into. We did not simulate the stacks in this case as it would have been difficult. We do not have pressure drop data for the intercooler. We have the pressure drop data from the rad and could get it with the OC. If it had ducting out the hood and not into the engine bay, we might have simulated it (if we had data for the intercooler).
Thanks, that makes sense with the schedule you have, but I wasn't sure if you had any fancy tricks to make that work. From your prior experience, how much difference does that make in the predicted front splitter performance? Do you account for that in the design?
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Old 04-19-2019, 07:51 AM   #24
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Thanks, that makes sense with the schedule you have, but I wasn't sure if you had any fancy tricks to make that work. From your prior experience, how much difference does that make in the predicted front splitter performance? Do you account for that in the design?
Not much on the splitter. It does affect overall drag though. Trends are still valid for A to B tests. Drag will be higher when you have any sort of heat exchanger added to the mix.
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Old 04-19-2019, 07:33 PM   #25
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Episode 11 came out. We wrapped up the build . We'll be doing a few more videos concluding the overall build as well.


Photo of the rear by Dustin Kessler



Thanks,
Eric
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Old 04-30-2019, 12:12 PM   #26
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We are working through our recap videos on the car now. First up is the cooling system recap!

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Old 05-20-2019, 08:32 AM   #27
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Front Splitter Recap Video:








Before it is asked, the bumper to the splitter will be sealed. Currently, our thoughts are to use heli-tape/racer's tape. Later on, FT86SF may do something here to improve upon the tape but tape will work for right now.

FT86SpeedFactory did a recap as well with the car:

https://youtu.be/yIVKJEWtsEA

Thanks,
Eric
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Old 05-27-2019, 08:53 PM   #28
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Another recap video for those interested . The car will be going to GTA Mid-West event this weekend for some shaking down.

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