FT-86 SpeedFactory Diffuser by Verus - Complete Aero Solution

[GSpeed]

I've got some questions about your performance figures, and I apologize if any of this has already been answered in the thread previously.

-What software did you use for your CFD?
-How did you validate the CFD data? Track testing, etc.
-How do the spacers affect the downforce generated?
-What ride height was the testing done at, and similarly, what's the minimum ride height that can be run before the diffuser chokes out?
-How does a rear wing impact the performance of the diffuser?

Thanks in advance, it's always nice to see some real design work being done.

Jake

[cslntuee]

Originally Posted by erok81

Oh if I came off as saying it's bad product or anything negative against you guys, I'm not. I should have been more clear I guess.

It was more of a warning to others and a heads up to you guys. Check the box before the ups guy leaves (I don't even know if that would help). Also to improve the packaging.

I haven't contacted anyone on it. At first, while I was a little disappointed, it was more of a joke. I don't expect any compensation or anything. I bent it back and it's really close. Like I said I'm probably the only one that will ever notice.

I will say one thing...I've had other diffusers in the past so was expecting an easy go bending it back. Nope. This thing is well built. It took wood and some hammering to get it straight.

On a positive note...it looks awesome and fits great. Took about 20 minutes to install. Five of that was trying to figure out what the CAD drawing was for - I'd suggest popping on to ft86 speed factory for the very nice instructions. Otherwise you'll wonder what the hell the piece of paper is for.

This isn't the best picture but it looks good!

What's the clearance between the diffuser fin and the ground (ride height)?

Thanks.

[plucas]

Originally Posted by PST

I've got some questions about your performance figures, and I apologize if any of this has already been answered in the thread previously.

No problem answering!

Originally Posted by PST

-What software did you use for your CFD?

OpenFOAM 2.2.1 as I have not upgraded in a while yet. We use some other programs for the pre-processing and post-processing obviously.

Originally Posted by PST

-How did you validate the CFD data? Track testing, etc.

Our CFD is validated using other CFD data by more very experienced teams/people and windtunnel data. I have ran the Perrinn LMP1 model in CFD to directly compare our data with their published data (which is a lot). I have also compared my results on the Ahmed model using published windtunnel data and published CFD results. This is the best way I know of to compare our CFD setup to guarantee we are doing everything necessary to receive the best results possible. A link below will go into more detail of the Perrinn LMP1 model.

Track testing will be our next step in validating in the future beyond just CFD. We just are too small and do not have the revenue yet to purchase proper data logging equipment. However, on track performance is our main goal. We do have many customers who track their cars a lot who have experienced more downforce on the track.

http://velox-motorsports.com/a-look-...fd-validation/

Originally Posted by PST

-How do the spacers affect the downforce generated?

The spacers will affect the downforce generated. I have not fully analysed all of this however. Most customers do not need that much information so it has not been a big priority.

Originally Posted by PST

-What ride height was the testing done at, and similarly, what's the minimum ride height that can be run before the diffuser chokes out?

The CFD is ran at stock ride height (150mm). I have done a ride height sensitivity test but it has not been released. This is with our splitter and diffuser. This type of test is better for a windtunnel

I did not analyse the ride height enough to choke the flow. I will get on this

Originally Posted by PST

-How does a rear wing impact the performance of the diffuser?

We have not analysed. It will have to be taken on a per wing basis as it will depend on the location. I have been working on a rear wing we want to make but design and analysis is still in the early stage. I will say though that the goal with our wing is to help the efficiency of the rear diffuser.

Originally Posted by PST

Thanks in advance, it's always nice to see some real design work being done.

Jake

Great questions and I hope I answered them clear enough

[GSpeed]

Originally Posted by plucas

No problem answering!



OpenFOAM 2.2.1 as I have not upgraded in a while yet. We use some other programs for the pre-processing and post-processing obviously.

Thanks for the detailed reply. I suspected it was OpenFOAM, I've been reading up on that but haven't taken the plunge. What are your thoughts on usability? I've heard it's somewhat hard to work with, but it looks like you guys have it figured out.

I completely understand your sentiments on testing. We're very happy to have the racetrack access that we do.

We've got a 2015 BRZ stuffed full of ride height sensors, tire temp sensors, etc. and we're planning on using the data to design parts and validate things we can sell to our customers. If you'd like to discuss a cooperative effort, shoot me a PM or email (jake at performancespeedtech.com) I'm sure we could find a way to get your parts on our car and get you some on-track data. We're already working with some other small companies doing exactly that.

[VerusEric]

Originally Posted by cslntuee

What's the clearance between the diffuser fin and the ground (ride height)?

Thanks.

From ground to the bottom of the strake depends on ride height of course, as well as diffuser installed height. The strakes, even in the lowest installed position, sits roughly even with the rear differential. This would be a more important measurement as that does not depend on ride height and should give you a good idea of where the diffuser will fit in the lowest position.

Originally Posted by PST

Thanks for the detailed reply. I suspected it was OpenFOAM, I've been reading up on that but haven't taken the plunge. What are your thoughts on usability? I've heard it's somewhat hard to work with, but it looks like you guys have it figured out.

I completely understand your sentiments on testing. We're very happy to have the racetrack access that we do.

We've got a 2015 BRZ stuffed full of ride height sensors, tire temp sensors, etc. and we're planning on using the data to design parts and validate things we can sell to our customers. If you'd like to discuss a cooperative effort, shoot me a PM or email (jake at performancespeedtech.com) I'm sure we could find a way to get your parts on our car and get you some on-track data. We're already working with some other small companies doing exactly that.

You'll have an e-mail shortly. I will let Paul expand on his experience with OpenFOAM. I used it for my senior design and after 9 months, it was still very clunky. It is not something easily learned and the fact Paul taught himself is fairly astounding after using it myself. It is a very powerful tool though, if used correctly.

[plucas]

Originally Posted by PST

Thanks for the detailed reply. I suspected it was OpenFOAM, I've been reading up on that but haven't taken the plunge. What are your thoughts on usability? I've heard it's somewhat hard to work with, but it looks like you guys have it figured out.

Usability is hard to judge. It depends on how much time you want to spend on it and your background in fluid dynamics. I had background using ANSYS Fluent and Star-CCM+ in college and a little after college before trying OpenFOAM. OpenFOAM was very very difficult at first as I am a mechanical engineer and not use to computer programming. I also never used Linux before which made it that much harder. It took me about 2 years working about 3 hours a day to become decent using it. Now, I love it and am glad I took the time to learn it. I have been using it for about 5 years and see no change in site as it is very powerful.

Since OpenFOAM has gained in popularity, they have classes now you can take. I would recommend that to speed up learning time. I know they have classes in Chicago for it in October. They did not have these classes when I was learning.

My main problem with OpenFOAM is the pre and post-processing. I finally became pretty good with the meshing software in OpenFOAM (snappyHexMesh). Before I really learned that, the pre-processing was a pain. I would mesh. It would be terrible. I would change values that should make it better and it would crash. I did a lot of reading before becoming good with it. Plus in the new releases, snappy has been updated to be more powerful. For post-processing, Paraview is pretty unstable in Linux in my opinion. So this is the pain. I do CAD in Windows. Transfer that to my CFD workstation that runs Linux. I would then mesh and run the case. Then transfer the case back to my Windows CAD machine for the post-processing in Paraview.

Another thing I really like about OpenFOAM is that it weeds out the people who just want CFD for marketing. Since it is so difficult to use, people who use it want it for meaningful results. There is a wealth of knowledge online also for it. If you decide to want to use it, hit me up and I can help you get started

[megamarines]

I can't help but be legitimately annoyed about a simple fitment question not being answered.

Will this fit an RS 1.0 or not?

[VerusEric]

Originally Posted by megamarines

I can't help but be legitimately annoyed about a simple fitment question not being answered.

Will this fit an RS 1.0 or not?

I apologize, I thought I answered this (or a few others) in this thread. We do not know *yet*. We have, I believe, two people received diffusers for their RS 1.0's soon that should confirm fitment. If anyone (you possibly) have some good pictures from underneath the bumper of an RS 1.0, that would help us determine fitment as well.

Edit: @megamarines, we believe it will fit though as the RS 1.0 likely didn't get any structural or architectural changes, just the bumper. So bolting to the car should not change.

Thanks,
Eric

[megamarines]

Originally Posted by NotEric6

I apologize, I thought I answered this (or a few others) in this thread. We do not know *yet*. We have, I believe, two people received diffusers for their RS 1.0's soon that should confirm fitment. If anyone (you possibly) have some good pictures from underneath the bumper of an RS 1.0, that would help us determine fitment as well.

Edit: @megamarines, we believe it will fit though as the RS 1.0 likely didn't get any structural or architectural changes, just the bumper. So bolting to the car should not change.

Thanks,
Eric

Thank you, I actually really appreciate the info. I can take pictures of the underside as best I can(without a lift) later tomorrow and send you the images; if that'll confirm bolt fitment or not.

[VerusEric]

Originally Posted by megamarines

Thank you, I actually really appreciate the info. I can take pictures of the underside as best I can(without a lift) later tomorrow and send you the images; if that'll confirm bolt fitment or not.

It will confirm if the mounting points are the same, which I assume they are but it is good to double check. Then it will be down to seeing how and if it fits with the rear bumper as that is fairly different from OEM. Hopefully the few guys that messaged me saying they want to test it out get back to me soon .

Please PM these to me, or e-mail (sales@velox-motorsports.com).

[ATL BRZ]

Pic dump from another very happy customer!



















Very impressed with the fit and finish so far. Can't wait to do some high speed track testing with it.

Thanks @NotEric6 for producing such a high quality aero product!

[Pug_BRZ]

Is that BRZ fitted with the JDM underpanels?

[VerusEric]

Originally Posted by Pug_BRZ

Is that BRZ fitted with the JDM underpanels?

Yes, Ian's BRZ does. He made the two work by trimming the plastic underbody panels. He said it was very easy actually. I'll let @ATL BRZ expand on that some more if he would like.

[Pug_BRZ]

Guys, you need to PM me or post up the details. Will make it easier to install when my replacement arrives.