Ramy your getting serous about driving 65mph down in VA man. All that ducting you want to do will totally help you out while avoiding cops going the speed limit! j/k, Damian I have a question for you. My wheel liner is getting warn down and doesn't fit very nicely with the new front bumper I have on. What have you done about this? Do you still just use the stock one, or none at all?

 

I'm not sure how the finished product will be but the results should be pretty favorable. I wish I could get a wind tunnel involved!! At this point I have two options the one I stated above with regards to the wheels and the other (which seems feasible with the way I changed everything) is angled back upwards, this was my first choice, but I had a different setup then and couldn't.

 

AHhh.... gotcha, my fault I thought you had pulled the Pro off to put this one on. I'm sure you get asked why the trailer hitch alot.

 

Hmm...angled back upwards sounds like it would def. work. I'd think that if it worked well enough, that would actually help you in generating downforce (not just greatly reducing lift). What was the other setup you were contemplating, if ya don't mind me asking?

As for a wind tunnel...doesn't Mazda have one at their headquarters in Irvine, CA? I wonder if they'd rent it out...(might as well...it's not like there are any Mazdas that are currently being wind tunnel tested lol)

 

"generating downforce" and "reducing lift" are referring to exactly the same thing.

Wind tunnels are incredibly expensive. To rent one would cost in the thousands if not tens of thousands of dollars per hour.

 

I could be wrong, since this definitely isn't my area of expertise, but I believe the two *achieve* the same thing, but by *different methods,* thereby making them two separate & distinct entities.

Lift is a force from underneath, pushing upward on the underside of an object, against gravity. Reducing lift would reduce the pressure exterted UPWARDS, thereby lessening the likelihood of the front end lifting up, for example.

Downforce is a force from above pushing downward, in line with gravity. Increasing downforce would increase pressure DOWNWARD, also lessening the likelihood of the car lifting up.

But for example, it's very difficult to generate downforce on the front end of the car. Hence, the method imployed is to reduce lift under the front end. In the rear, however, a spoiler can be employed to generate downforce.

Furthermore, you can have a lot of lift, and a lot of downforce at the same time, and stability would simply be the sum of those two forces. The greater force would win. So I believe they're two very distinct and opposite forces, or say, the same forces, but applied in different directions, both utilized to attain the same goal.

If I'm wrong, my disclaimer is already in the first sentence lol, and please correct me

Whaaat?? I'm sure they're expensive to make...but they charge you THAT MUCH to use it too? Even Mazda? Considering we're working on their beloved child, the FD?! Damn...I never woulda thought it would be THAT expensive. No one's got a hook-up @ Mazda headquarters or somethin?

 

Basically, net force is what is important.

There may be a force above the car(downforce) and there may be a force below the car(lift). What is important is the net effect of these forces.

For example, if there is a vacuum created under the car causing "decreased lift", the net effect is downforce on the car.

For more on this read this thread
https://www.rx7club.com/showthread.p...6&page=6&pp=15

 

Good thread. I'm gonna have to put that aside, cuz it looks like it warrants a nice read. Thanks

But I think we're on the same page...I agree with you that downforce is nothing other than negative lift, etc...and that net force is what's important. That's why I said:

 

whatever doods, i just want it to look cool ;-)

 

Yea I figured that much from your other post haha

 

Hey Damian...lookie what I found! (Not exactly a complete pic, but it helps!)

EDIT: Note to self: Might wanna buy optional inserts such as those pictured below, and install on my RE Diffuser Pro...

 

nice find, that pic is sweet


by the hay, here is an update:

The splitter/undertray help up great at a full 2 day event at roadamerica and an event at MAM. I have some tweaks I want to make to the dzus fittings and some other minor changes. Later in the winter I'll get the cost figured out and do some other nose test fittings.

More to come...

 

Helped out a lot, huh? Did you feel a difference or what?

EDIT...I just figured out that was a typo...you meant "held up great" rite? Well, that's great news too

 

hahaha oops, i ment HELD up great, structurally. I was faster at both tracks so who knows, may have helped :-)

 

does this have the same fitment issues as your brake ducts?

Tim

 

hahaha you bastid!!! LOL

by the way my brake duts worked great at RA and MAM!!!!

 

Ok, I feel really left out of this joke... what's the deal w/ Damian's brake ducts?? Someone fill me in here!!!

 

Damian made some prototype brake ducts to bring air directly into the center section of the rotor. It didn't have a 1/8 to 1/4 inch lip and he got raped about it. In the end, the thread did give insight on air ducting issues and Damian was going to incorporate the changes the next go round over the winter.

Did the brakes take longer to fade or with cooler air temps (if that is the case) can you really say it was the ducts?

Back to the regular thread now


Tim

 

yeah, ont eh brake duct backing plates, i think they are fine, ill add the lip if im up to it, if not, who cares :-)

 

So Damian, you actually made a duct for them? Is there a thread w/ the pics + details? I'm really curious if you found any diff/improvement in brake life etc w/ these ducts??

 

yeah, well, what i made was a baking plate to help direct the air to the center of the rotor, the actaul 'ducts' go in the nose of the car and i purchased some formed ducts for those.

https://www.rx7club.com/showthread.p...backing+plates


I can tell you this, before i had any ducting the oem porsche rotors would be totally 'spider' cracked up after one event, ...... since the brake ducts were installed i have done roadmaerica (arguably THE hardest track on brakes) and MidAmerica and there are no spider cracks on my rotors, they look great :-)

 

Damian,

I'm gonna read your thread a bit later, but have you considered getting your rotors cryotreated? I got my Brembos cryotreated from Gotham Racing, and they're supposed to be 300% stronger (so cracking shouldn't be an issue), and dissapate heat much more efficiently as well...

 

>>but have you considered getting your rotors cryotreated

i already do ;-)

 

OMG lol...that RoadAmerica course must be KILLER!

 

other than taking a shop'd word for it, how can you tell if somethings been cyro treated? I got burned by Ray at SR motorsports when I took his word for it concerning the upgraded turbos that weren't more than a shitbox with fan blades stuck to a turd. Like cryo treated brakes and rotor housing, et al.

Tim