Post your DIY aero pics - Page 26 - Miata Turbo Forum -Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Race Prep Miata race-only chat. 949 Racing - Rim & tires

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 08-03-2013, 06:17 AM   #501
Senior Member
iTrader: (4)
 
mr_hyde's Avatar
 
Join Date: Jul 2009
Location: Seattle
Posts: 799
Total Cats: 25
Default

Quote:
Originally Posted by jpreston View Post
...but what I didn't expect was that the aluminum angle pieces I had attached to the splitter as backing for my airdam ended up taking out 2 fresh hoosiers.
Yikes! That's how I backed my air damn too. I've been off twice I can think of and must have got lucky on the shoveling.

Emilio - what is the height to the bottom of the splitter at the leading edge?
mr_hyde is offline   Reply With Quote
Old 08-03-2013, 10:06 AM   #502
Supporting Vendor
Thread Starter
iTrader: (3)
 
emilio700's Avatar
 
Join Date: May 2005
Posts: 4,540
Total Cats: 841
Default

3.5"
emilio700 is offline   Reply With Quote
Old 08-03-2013, 02:27 PM   #503
Senior Member
iTrader: (4)
 
mr_hyde's Avatar
 
Join Date: Jul 2009
Location: Seattle
Posts: 799
Total Cats: 25
Default

Quote:
Originally Posted by emilio700 View Post
3.5"
In for more crappy cell phone pics. The sub frame of my car has only 3" of clearance with the 1/2" splitter material so 3.5" at the leading edge would give me upward rake. I don't have pinch weld heights handy but Crusher sits lower at a glance.
mr_hyde is offline   Reply With Quote
Old 08-03-2013, 03:49 PM   #504
Senior Member
iTrader: (2)
 
Join Date: Dec 2008
Location: KY
Posts: 621
Total Cats: 34
Default

Quote:
Originally Posted by mr_hyde View Post
The sub frame of my car has only 3" of clearance with the 1/2" splitter material so 3.5" at the leading edge would give me upward rake.
This is exactly how my car sat last weekend. 3" at the subframe, 3.5" at the tip of the splitter. I didn't get any good timed laps in before hte splitter came off, but the car felt the fastest it's ever felt. I'm not worried about a little upward rake.
jpreston is online now   Reply With Quote
Old 08-03-2013, 04:20 PM   #505
Supporting Vendor
Thread Starter
iTrader: (3)
 
emilio700's Avatar
 
Join Date: May 2005
Posts: 4,540
Total Cats: 841
Default

4.25 F/4.5" R without driver
emilio700 is offline   Reply With Quote
Old 08-03-2013, 05:17 PM   #506
Senior Member
iTrader: (4)
 
mr_hyde's Avatar
 
Join Date: Jul 2009
Location: Seattle
Posts: 799
Total Cats: 25
Default

Does the splitter go under the front of the sub frame or stop somewhere between there and the heat exchangers?
mr_hyde is offline   Reply With Quote
Old 08-03-2013, 06:31 PM   #507
Supporting Vendor
Thread Starter
iTrader: (3)
 
emilio700's Avatar
 
Join Date: May 2005
Posts: 4,540
Total Cats: 841
Default

Quote:
Originally Posted by mr_hyde View Post
Does the splitter go under the front of the sub frame or stop somewhere between there and the heat exchangers?
To subframe. Full coverage, all one piece.
emilio700 is offline   Reply With Quote
Old 08-03-2013, 08:04 PM   #508
Senior Member
iTrader: (4)
 
mr_hyde's Avatar
 
Join Date: Jul 2009
Location: Seattle
Posts: 799
Total Cats: 25
Default

So from the subframe to a 3.5" leading edge, you have a bit of upward rake? The bottom of the front subframe seems to be the lowest point on the whole car. I'm considering less underneath coverage so I can get the front closer to 4" while maintaining level to the ground.
mr_hyde is offline   Reply With Quote
Old 08-03-2013, 10:09 PM   #509
Senior Member
 
Join Date: Oct 2011
Location: The Race Track & St Pete FL
Posts: 573
Total Cats: 49
Default

This was my first one and it is the same height as the subframe
Attached Thumbnails
Post your DIY aero pics-2012-04-27110249.jpg  
1993ka24det is offline   Reply With Quote
Old 08-04-2013, 02:15 AM   #510
Supporting Vendor
Thread Starter
iTrader: (3)
 
emilio700's Avatar
 
Join Date: May 2005
Posts: 4,540
Total Cats: 841
Default

Quote:
Originally Posted by mr_hyde View Post
So from the subframe to a 3.5" leading edge, you have a bit of upward rake?
No, mine is like Jeff and everyone elses. I think you are assuming we attach to the lowest point of the subframe. Bad idea. You'll tear it up. We make a tongue sorta like 1993ka24det's and slot it in on top of the lip there in between the rack mounts. I haven't measured it's rake but it's pretty close to level I think.

Less crappy cel phone pic from ACS today

Attached Thumbnails
Post your DIY aero pics-1146702_497622040312304_1505084109_n.jpg  
emilio700 is offline   Reply With Quote
Old 08-04-2013, 02:47 AM   #511
Senior Member
iTrader: (4)
 
mr_hyde's Avatar
 
Join Date: Jul 2009
Location: Seattle
Posts: 799
Total Cats: 25
Default

OK - thanks. I was going from the bottom of the subframe which is costing me almost an inch. I'll have to see what clearance I have to the steering rack mounted FM oil cooler. I'll probably need to finish the season with my low clearance and hope I don't have a nasty off. I'll redesign everything from scratch over the winter.
mr_hyde is offline   Reply With Quote
Old 08-05-2013, 09:43 AM   #512
Junior Member
 
Join Date: Dec 2012
Location: Charlotte, NC
Posts: 227
Total Cats: 14
Default

Well, unfortunately, I didn't get much data with the splitter setup as pictured compared to the COT splitter.

Right out of the gate on Saturday, my time with the new setup was good for two seconds over my best time with the COT splitter. Understeer was gone, handling was neutral with the slightest hint of the back stepping out in places. I never bottomed out with the COT splitter, but was making contact several times here and hitting the bumpstops (also confirmed by a few fender marks on the front tires). I didn't want to stiffen the shocks up without more than one run to base it on, but sadly, during run #2, a bump in turn 17 unloaded the suspension, and a slight offroad excursion and contact with a wall and huge tree branch result in the splitter and mounts getting annihilated.

I really would have liked to see what it was capable of. I finished up the weekend using just the air dam and rear wing, and the first run had so much understeer it was terrifying. I ended up with the front Konis nearly full loose, and the rear shocks at about 3/4 stiff, and finished the weekend slipping and sliding my way to about 4 seconds quicker than my best time. I'm confident that I could have bested that time with the splitter had I been pushing as hard as those last couple banzai runs.

I think I will likely go with something comparable to this setup with the spill plates next year, just need to come up with a better mounting solution for getting on and off the trailer with the new nose.
Attached Thumbnails
Post your DIY aero pics-photo-4-.jpg  
Supe is offline   Reply With Quote
Old 08-05-2013, 01:31 PM   #513
Junior Member
 
Join Date: Mar 2012
Posts: 297
Total Cats: 18
Default

Bear in mind I am a complete amateur and have no aerodynamics experience, I am in no way trying to **** on your design.

If the purpose of the sills in to keep more air on the splitter and in turn more downforce, do the sills need to be so large?

Gurney lips on rear wings have been used for decades. It keeps more air on the wing for longer, would something on splitter edging not work similarly?

If a 1/2" lip on the side edging of the splitter, where you have your sills now, could keep air on the splitter longer, as opposed to spilling off the sides. And without creating the drag the large sills do between them and the front bumper/fender.

Just a
M.Adamovits is offline   Reply With Quote
Old 08-07-2013, 01:26 PM   #514
Supporting Vendor
iTrader: (3)
 
Join Date: Jul 2006
Location: San Diego
Posts: 2,575
Total Cats: 234
Default

Bigger is better. Any two things that operate in completely perpendicularly different directions of airflow, such as a gurney flap and a splitter endplate are two things that are so different they probably shouldn't even be mentioned in the same sentence. A smaller lip would help when compared to none at all, but a bigger one will create a larger build up of pressure and therefore downforce than a smaller one. At some cost of drag of course. I have some theories about how that can possibly be minimized while still using a large endplate though.

-Ryan
ThePass is offline   Reply With Quote
Old 08-07-2013, 01:49 PM   #515
Junior Member
 
Join Date: Mar 2012
Posts: 297
Total Cats: 18
Default

Gurney lip is used loosely. I was picturing something quite a bit larger, maybe 5-6" tall, but is a fender height side plate really needed?

I think the tall side plate sealed to the bumper/fender at the rear edge would create way too much drag.

But I don't have 400hp pushing me along either.
M.Adamovits is offline   Reply With Quote
Old 08-07-2013, 01:59 PM   #516
Supporting Vendor
iTrader: (3)
 
Join Date: Jul 2006
Location: San Diego
Posts: 2,575
Total Cats: 234
Default

It's going to produce more drag than without it. "Way too much" depends on a lot of other factors. We know for certain that there are cars for which the benefits of this feature greatly outweigh the drawbacks. Knowing whether it's right for a certain car takes only a bit of real-world testing.
-Ryan
ThePass is offline   Reply With Quote
Old 08-08-2013, 04:26 AM   #517
Junior Member
iTrader: (2)
 
Join Date: Mar 2008
Location: Irvine, Ca
Posts: 277
Total Cats: 22
Default

More GTC 250 goodness. Dont judge me on my lack of front aero. Been too busy with research and helping Sonny on his car to finish my car.



Attached Thumbnails
Post your DIY aero pics-img_2947_zps10f0d568.jpg   Post your DIY aero pics-p1040101_zps93db68f5.jpg  
cjsafski is offline   Reply With Quote
Old 08-08-2013, 05:36 PM   #518
Junior Member
 
Join Date: Dec 2012
Location: Charlotte, NC
Posts: 227
Total Cats: 14
Default

Quote:
Originally Posted by M.Adamovits View Post
Gurney lip is used loosely. I was picturing something quite a bit larger, maybe 5-6" tall, but is a fender height side plate really needed?

I think the tall side plate sealed to the bumper/fender at the rear edge would create way too much drag.

But I don't have 400hp pushing me along either.
All I know is that it worked pretty darn well with it. You'd imagine that at some point, some of the drag may be negated by a bubble effect, comparable to the pickup truck bed scenario. I will likely be doing something very similar with the new nose, except that the air forced into the radiator opening will now be ducted straight out the top of the hood, which should provide a marked improvement.

Really ought to spend the bucks on some wind tunnel time next spring up in Mooresville...
Supe is offline   Reply With Quote
Old 08-25-2013, 12:20 AM   #519
Elite Member
 
Join Date: Jul 2007
Location: Little Rock, AR
Posts: 3,094
Total Cats: 117
Default

Quote:
Originally Posted by Keith@FM View Post
Nope, the car was actually nicely balanced once I had the sway bars set up right. It's got a flat undertray in the nose and a decent splitter. The canards make a noticeable difference as well. Obviously, I needed a lot more wing for that last corner...

Since there have been no pics in the thread. All this stuff is DIY at home. Well, the wing mounts were laser-cut, but since I made the first set at home I'm still taking the points for them
Wing is a COT on FM-style mounts, a bit taller than the production ones.


Canards, splitter and wheel spats. I did do some before/after on the canards, they work.


Splitter without the other bits. The cables allow it to flex up if necessary but they'll take a significant amount of load. I forget the rating, something like 400 lbs each. I also modified the eye bolts to improve their rating.


Under the nose with the splitter removed.




You can tell the splitter's working, the cables are taut! They've got a bit of slack at rest.
Kieth, why are you so resistant to the flat front many of us run now. Your current setup "pac-man mouth" is creating a ton of drag and some slight lift. I bet you could get rid of the splitter completely with a flat front end ala Crusher and keep/gain your front anti-lift the same as the current setup.
jacob300zx is offline   Reply With Quote
Old 08-25-2013, 01:14 AM   #520
Senior Member
iTrader: (1)
 
Join Date: Sep 2006
Posts: 720
Total Cats: 68
Default

"So resistant" is being a little overdramatic. I've never said anything against it. I just haven't done it on my car.

Although plucas's simulations would disagree with your statement. My setup (#4) is considerably more efficient than a flat nose without a splitter (#5). Note both the lift numbers and the drag between those two.

Since I have a little more horsepower than most, drag is not as much of a concern to me as it is to cars like Crusher. And I'm learning more by playing with canards and splitter depth than I would by simply copying other setups. That's important. It's also a setup that I can easily revert to full rally spec if required as well - this is a multi-use car.
Keith@FM is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
In need of base map for stock 1997 brandonbkd MEGAsquirt 0 09-29-2015 12:52 AM


Tags
aero, diy, splitter, spoiler, wing

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 12:07 AM.