Carbon rear Diffuser Plate - Page 4 - Lexus IS Forum
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post #46 of 353 (permalink) Old 12-03-2009, 12:04 PM
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Wow that looks very cool Mike. I have a noobie question that im sure would benefit a lot of people. I think I understand the general concept of this, but how functional is the diffuser plate? Do you believe it will be a night and day difference? From what I gather it can only be felt at higher speeds. Is this true? What kind of benefits would someone receive using this diffuser plate? Thanks Mike,

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post #47 of 353 (permalink) Old 12-03-2009, 04:13 PM
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Well I will get a lot of flack here as I have in the past, but I felt changes in the handling at 60mph and up. The vacuum on the exhaust was actually felt and there was good performance gains. It was pretty weird, like the car just sucked down and kept accelerating without problems. To avoid a fight with the ral CFD pros I will not make any further statements than those of my opinions. Once I get this done I have some instrumentation and a flat newly paved section of road that I will be able to get some suspension pententiometer readings for comparison. That is all.

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post #48 of 353 (permalink) Old 12-03-2009, 09:47 PM
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Good stuff Fig, seeing Progress is awesome, keep it up!
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post #49 of 353 (permalink) Old 12-04-2009, 11:15 AM
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Great... thats what I wanted to know... those high speed NJ Turnpike runs would be perfect with this....
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post #50 of 353 (permalink) Old 12-05-2009, 06:16 PM
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Maybe it's just me and my perspective problems... but correct me if i'm wrong



This picture is shown looking at the difusser from the front of the car and the exhaust opening is on the right...



This picture is shown photoshopped difusser on the car looking at it from the back of the car and the exhaust opening is on the right.


Does not seem like the 2 of them are same... if you get what i mean

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post #51 of 353 (permalink) Old 12-05-2009, 09:43 PM
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pespective can be a tricky thing the upper is actually looking from the rear underneath. Both models are taken right out of CAD views .
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post #52 of 353 (permalink) Old 12-06-2009, 10:40 AM
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I know this is being designed for the stock rear bumper, however will it be able to fit with aftermarket bumpers/lips?

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post #53 of 353 (permalink) Old 12-06-2009, 11:37 AM
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I know this is being designed for the stock rear bumper, however will it be able to fit with aftermarket bumpers/lips?
Any lip that extends below the stock undertray will have to be modded with this first rev. Later down the line I can look at changing the design to wrap around a lip. That will be one good thing about the aluminum design and having it two peice. I can change the "ramp" insert to another angle and extend it etc to go beyond a lip. It may require another peice to tie it back into the bumper though. The key to this peice is the angle of exit...and if the lip goes too low, than it defeats the purpose.

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post #54 of 353 (permalink) Old 12-06-2009, 04:25 PM
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To avoid a fight with the ral CFD pros I will not make any further statements than those of my opinions.
Fig
Good decision. I actually took a little time to research and discuss this particular flow field when I got time away from the combustion stuff. I have some .pdf's of scientific journal articles that discuss this flow field from the standpoint of commercial CFD codes, research oriented algorithms (LES - DNS), and experimental data. If you want them, I will send them to you via email or pm or something.

I know you are short on time, but I wish you would read them because I think you really need to see for yourself just how far away you are from legitimate design of a turbulent diffusing flow field of that scale using the resources you have available.

In all honesty Fig, I do applaud you for attacking projects from a scientific, functional standpoint. I just beg of you, from here on out, not to overstep your own scientific bounds for the sake of making a dishonest buck. That s*** just aint cool.
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post #55 of 353 (permalink) Old 12-06-2009, 08:21 PM
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Good decision. I actually took a little time to research and discuss this particular flow field when I got time away from the combustion stuff. I have some .pdf's of scientific journal articles that discuss this flow field from the standpoint of commercial CFD codes, research oriented algorithms (LES - DNS), and experimental data. If you want them, I will send them to you via email or pm or something.

I know you are short on time, but I wish you would read them because I think you really need to see for yourself just how far away you are from legitimate design of a turbulent diffusing flow field of that scale using the resources you have available.

In all honesty Fig, I do applaud you for attacking projects from a scientific, functional standpoint. I just beg of you, from here on out, not to overstep your own scientific bounds for the sake of making a dishonest buck. That s*** just aint cool.
Send em on over. contact@figsprops.com. I would like to think I am not in the business of a dishonest bucks...I think I usually tend to get things right eventually, typically not on the first shot and I am the first to admit that..
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post #56 of 353 (permalink) Old 12-06-2009, 11:52 PM
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Good decision. I actually took a little time to research and discuss this particular flow field when I got time away from the combustion stuff. I have some .pdf's of scientific journal articles that discuss this flow field from the standpoint of commercial CFD codes, research oriented algorithms (LES - DNS), and experimental data. If you want them, I will send them to you via email or pm or something.

I know you are short on time, but I wish you would read them because I think you really need to see for yourself just how far away you are from legitimate design of a turbulent diffusing flow field of that scale using the resources you have available.

In all honesty Fig, I do applaud you for attacking projects from a scientific, functional standpoint. I just beg of you, from here on out, not to overstep your own scientific bounds for the sake of making a dishonest buck. That s*** just aint cool.
you have 21 posts on this forum. 21 posts all ragging on this design. did you join for the sole purpose of shitting on the idea of a functional rear diffuser? never once has figs said that this design was r&d'd and ready to give you a 100% increase in downforce.... leave it alone. its not done, we're waiting patiently, and its not in figs nature to put out a product that doesn't work or that he doesn't have confidence in. a faulty product could end him as a vender at this stage. i think he's smart enough not to let that happen.

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post #57 of 353 (permalink) Old 12-07-2009, 09:54 AM
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you have 21 posts on this forum. 21 posts all ragging on this design. did you join for the sole purpose of shitting on the idea of a functional rear diffuser? never once has figs said that this design was r&d'd and ready to give you a 100% increase in downforce.... leave it alone. its not done, we're waiting patiently, and its not in figs nature to put out a product that doesn't work or that he doesn't have confidence in. a faulty product could end him as a vender at this stage. i think he's smart enough not to let that happen.
Its all good man, he has a PHD in the field so his input is valued. It is a very complex problem and CFD is an everexpanding sink of computational power and correct modeling. He sent me some great articles that I will slowly digest over the Christmas break A lot of info available out there for sure. the important thing is that I create a product that people are happy with, provides some results and is reasonably priced. There will not be much more to argue with at that point Most of you want a cosmetic peice anyway

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post #58 of 353 (permalink) Old 12-07-2009, 10:46 AM
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Its all good man, he has a PHD in the field so his input is valued. It is a very complex problem and CFD is an everexpanding sink of computational power and correct modeling. He sent me some great articles that I will slowly digest over the Christmas break A lot of info available out there for sure. the important thing is that I create a product that people are happy with, provides some results and is reasonably priced. There will not be much more to argue with at that point Most of you want a cosmetic peice anyway

Fig
for sure, and thats not what i'm against. i want you to have all the help from any knowledgable person you can, be it dub t or otherwise. i've read his posts and i can see he knows what he's talking about, but its the little querks that bug me. when he accuses you of making a dishonest buck and stuff like that. i can see when he's helping, but the rest isn't wanted. this is not my battle, and i'm sorry for butting in, just a tad annoyed. thanks, good luck and godspeed.

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post #59 of 353 (permalink) Old 12-07-2009, 05:59 PM
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This is funny, FIG in the market to make a dishonest dollar? I think you need to sit back and do some research on Fig, I dont trust many people but for sure he is in the top 5!

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post #60 of 353 (permalink) Old 12-08-2009, 10:49 PM
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finished up...sort of..the mounting plate. Could be ready to cut out soon. It may be tricky to install unless I add more entry angle to the clips.
I also added 1" to the side wings as that matched my previous mock up dimensions. I will hem and haw a bit more and then pull the trigger.


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