A little something like this


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Thats yummy looking lol I wish I could find a carbon fiber diffuser like that. Also wouldn't mind a carbon fiber hood either haha. That black pearl kit is amazing looking really wanted one but just cant come to terms that one person not paying attention and there goes a $4000 limited edition body kit lol

 

 

 

My comments were in regard to the diffuser you showed in your original post No. 1, which is applied to the rear bumper area of the car. The above photo seems to have no practical purpose and looks like it may be intended for the top of the rear window.

A true diffuser will have an angle of approximately 30 degrees or less. The angle will depend on how smooth the air flow is when it enters the diffuser. Extremely turbulent airflow will not diffuse at all, it just continues, ignoring the diffuser wall with no increase in static pressure (which is the purpose of a diffuser). A proper diffuser design can only be accomplished by data which defines the airflow profile. Even then, if it to be optimized, it should be tested to determined the efficiency.

 

This is probably the most technical thread I've read through in a while.

Thank you.

I do like the look of a diffuser, but as has been stated, it has to match the car so it would be effective. I love the look of the roof top guides on the Lancer, ,but wonder the effect they would have on our cars.

Would love to be able to increase highway stability, as my daily commute is 90% freeway speeds and lots of cross winds due to the open terrain.

Anything to make it better, right?

Again, great conversation here..

 

My apologizes if I offended anyone with my technical approach. I am a retired Aerospace Engineer after 40 years of gas turbine experience in the SR-71 Blackhawk spy plane and B-2 Stealth Bomber, amongst other various aircraft programs.

My suggestion is that every individual choose what they really like. Don't try to justify your decision on parameters that you can't justify. Not necesarry. Everyone is entitled to choose what they like and what they don't like. Just don't try to justify you decision based on falsehoods. Our politicians have ownership in that area. Don't stoop to that level and stick with facts that you know. No apologizes necessary for not knowing everything about everything. Enjoy life and let others enjoy their life.

 

This. Go here and see. This company offers detailed test data for most of their aero parts. https://www.verus-engineering.com/information-testing

I'm an engineer too....though not aero!

 

Sorry, but I didn't see any "test data" in the referenced web site. Just vague presentations of a computer program attempting to analyze airflow in a virtual wind tunnel with simplifications that avoid much of reality. No proof of actual test data to verify their results. Difficult to understand what they are trying to prove, as their drag curves show no change from the production model. That mean that the "diffuser" is having no effect in increasing the rear static pressure and is not working as a true diffuser. They seem to be trying to show that there is a change in downward force on the vehicle, but that is not the purpose of a diffuser.

I'm afraid I'm too ignorant to understand what they are trying to sell.

 

Not at all! On the contrary... I enjoy the more technical discussions here and this one has been great. Lots of useful data and quality comments.

Please continue!

 

Just being honest, I have never noticed my front end to wander? I probably have taken my car up to 90, that's about it....I know Lexus went to some effort to be able to publish that .26 number, it's really quite low, but again the frontal area of this car is fairly large. When I noticed that "pad" was completely missing ahead of my front right wheel, I installed one, only because I know the engineers put it there for a purpose. But I didn't see any benefit, just that I knew I had replaced what was missing.

Again I think it boils down to looks, if you like it, by all means install the diffuser and it's not going to hurt anything...my .02.

 

Its not wandering its like a when a cross breeze hits it or something I have no idea how to explain it. Some people are just not in tune with there cars and tell when the balance is offset by something, but ls430's definitely get squirrelly when a gust of wind or something upsets it.

 

I am sorry to tell you this, but LS430 front end is not (!) supposed to push around when its windy. This problem is very well researched on LS430 forum and is related to mechanics, not aerodynamics. I suggest to research the possible causes for that before throwing money on "aerodynamics". Possible causes include but not limited to improper installation of suspension parts, improperly torqued bushings "in the air", failure to reset Zero Calibration procedure, Wheel unbalanced condition, Poor alignment, Air in the brake system, Poor electrical contacts on the battery/ low voltage to ECM.

But I know you are not going listen to my and some other people's advice and insist that there is no problem with your car .

 

Emailed them explained I want a diffuser that will help the car be more stable during crosswinds. Got a message back that th2ey dont make anything for my car but I could possibly retrofit something. I am really interested in there universal stuff maybe some hood louvers thanks for posting there website did not even know they existed until today.

What is your area of expertise?

 

You are correct I know for a fact there is nothing wrong with my car. 2k worded it better than I did its when there is a crosswind it upsets the balance/pushes the front end.