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Discussion Starter #1
I know its not a mustang but I've been posting on this site for along time. Just wanted to share some pictures of me making and installing are rear diffusor and wing on a Porsche 968. He races in NASA with me in the GTS2 class.

Making the diffusor


mocking up the wing with ratchet straps and bungee cords. The green things hanging off the trailing edge are make shift plum bobs so I know where I am in relation to the rear bumper and the wood represents just shy of level.


I made this splitter back in the summer and posted a thread about it. All I did here was make the dive planes bigger and put some decals on it this time since a bunch of people kept asking who made it when he went to races.






 

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Looks great, I remember when you posted the splitter info on the nasa site. Did you make the wing too?? Should make some serious downforce, looks to have a pretty substantial chord...
Hope to see you on track sometime, do you plan to make any NASA-MA events this year? I might try to make the watkins event, never been up there...
Ed Hunter
AI #215
 

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I can't see, what's backing the mounting plates up on the other side of the glass?
 

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Very jealous of you guys that can use wings.

Some questions on the difuser.

  • What thickness of aluminum?
  • Is it welded or riveted together?
  • Do the uprights have a "T" or "L" bend on the bottom for stiffness?
  • What is the length?
  • How much does it weigh?
  • Is the car flat bottom?
I need to do some aero work on my car this season. I already have the splitter and a flat bottom is pretty easy. I need a spoiler (no wings in my class) and the rear of the car is already setup for a difuser, so I may do both at the same time.

TIA,

DaveW
 

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Discussion Starter #5
Looks great, I remember when you posted the splitter info on the nasa site. Did you make the wing too?? Should make some serious downforce, looks to have a pretty substantial chord...
Hope to see you on track sometime, do you plan to make any NASA-MA events this year? I might try to make the watkins event, never been up there...
Ed Hunter
AI #215
I did not make the wing.

I plan to do Hyperfest. Do you know Jimmy Bost? Hes the one that got me into racing AI. And I plan to do the Glen toward the end of year.
 

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Discussion Starter #6
I can't see, what's backing the mounting plates up on the other side of the glass?
thats top secret... Just some 1 inch square tubing attatched to the frame rails.
 

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Discussion Starter #7
Very jealous of you guys that can use wings.

Some questions on the difuser.

  • What thickness of aluminum? .050
  • Is it welded or riveted together? countersunk rivits (approx 200)
  • Do the uprights have a "T" or "L" bend on the bottom for stiffness? Don't quite get what you mean. There is no bend on the bottom. There are tabs that come through the lexan and attach to the uprighs.
  • What is the length? the rear edge is about 18 inches. leading edge is 13. Keep in mind the uprights go through the lexan about an inch.
  • How much does it weigh? the wing is 10. the uprights are 5, and the tubing is 5 so the whole deal is only about 20lbs. The diffusor is 26 but ditching the factory wing and putting in lexan, everything only added approx 12lbs
  • Is the car flat bottom? No it is not. That is next on the customers list. this will also improve the efficiency of the diffusor.
I need to do some aero work on my car this season. I already have the splitter and a flat bottom is pretty easy. I need a spoiler (no wings in my class) and the rear of the car is already setup for a difuser, so I may do both at the same time.

TIA,

DaveW
what class do you race in?
 

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Looks like a thought out package. Nice install.
 

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what class do you race in?
E Modified - Autocross.

We can't use wings, but can do spoilers, diffusor and flat bottom. With the TA body I use, I have a good splitter and it is clearanced in back for the diffusor.

Regarding the "uprights" I was asking about, I meant the ones on the diffusor. Do they have any bends on the bottom side for rigidity or are they good enough without?

EDIT: Never mind, I looked at the pics again and answered my own question. :)

Thanks,

DaveW
 

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Discussion Starter #11
Looks like a thought out package. Nice install.

Thank you. I must compliment you on the work you have done on your car as well. Some very impressive stuff.
 

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Discussion Starter #12
E Modified - Autocross.

We can't use wings, but can do spoilers, diffusor and flat bottom. With the TA body I use, I have a good splitter and it is clearanced in back for the diffusor.

Regarding the "uprights" I was asking about, I meant the ones on the diffusor. Do they have any bends on the bottom side for rigidity or are they good enough without?

EDIT: Never mind, I looked at the pics again and answered my own question. :)

Thanks,

DaveW
Oh, I am not familiar with SCCA's auto-x rules at all. The strakes on the diffusor just have a bend on the top. They aren't that large so they should be OK.
 
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