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Hey Sparky,
That transition at Pacific pulls a lot of folks into the wall, listen to your instructor and do what he says...you'll be fine. Edit: my bad, T-9 will cause problems also!

Cheap aero...If it were me I'd be looking at a chin spoiler and a spare "track hood". I'd hit up your local wrecking yard and look at vents from some of the 80's and 90's imports and cut them into your spare hood.

I've found the biggest improvements in aero are keeping the air out from under the car (which causes lift) and relieving the engine bay of incoming air. The spoiler does cause drag but the benefits of eliminating the pressure under the car out way the drag from the spoiler.....think about all the "hang ups" that cause drag under the car, control arms, exhaust, rear axle....

While not an early mustang, I picked up 3mph at Bonneville by cleaning up my aero, free horsepower!

:thumbsup:
 

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Discussion Starter #22
Thanks Dbasher, exactly what I'm leaning towards.

BTW, that friend that I mentioned earlier is my coach at that track. He now races an E30 race car.

The spare hood is an EXCELLENT idea. I doubt any wrecking yards around here have any first gens, but I do know a guy that restores them, so he's bound to have one eventually :). I'm thinking along the lines of the New Edge Mustang heat extractor hoods - the vents are behind the "scoop" if you will, near the cowl.
 

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As we have thrown out the idea of a track hood, how about rear trunk lid too? Lift/snap over steer is going to ask for more rear traction and not more front end bite. It must be balanced! I must concur that this turn is more weight transfer than aero.....but your straight away lift that you are complaining is certainly the aero brick your driving.

Clearing air out of engine bay without shoving it under you is going to help. You need air flow to cool but you need to clear this too. If you open can funnel this appropriately you can achieve benefits in both. On these old Mustangs with NO aero attention done to underside, I don't think the increase in frontal area vs possible lowering of cd is going to be a net loss. The Trans Am guys, though 40 years ago, were pretty sharp. The vintage racers of today are VERY sharp. Just copy them within reason. They are pretty fast for what they are given as a palate.

I don't think an air dam is even a question. I also think experimenting with a cheap trunk lid with an adjustable rear spoiler for height or a deck lid with wing and adjustable wickerbill/Gurney to dial in balance is worth thought when discussing aero balance. Many a Porsche 911 has met its end to aero inbalance as they are like trying to get a "wing" to not fly.
 

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Sparky, just put a "want" in classifieds. If you weren't across country I could give you one from previous restorations.
 

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Small world, I've reconnected with an old high school friend that does the same, he's now moved into the new class. C. Hurley, hell of a wheel man!

Keep your eyes peeled on Craigslist for a hood, I've seen a few that would be perfect for this kind of set up go for cheap.

See you at the track!
 

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I lifted the rear of the hood by loosining the hood hinges and pulling them as far upward as possible then added spacers between were hood and the hinge bot togeather. Taller spacer at the rear. Had to do some hood latch adjustments too I THINK.

mY 69 Shelbey GT 350 got realy sweet after lowering the front about an inch. Think that front bumper acted a bit like a spoiler and the rear vent holes in the rear of the hood helped also. At speeds around 90 and above the car would settle downwards about an inch or so and stay that way even at 200 MPH.
 

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When mine started to try and fly on the drag strip I lowered the rear 2 inches and the front 3 through a combination of springs and tires. Tucking the tires up in the fenders helps quite a bit. The rake angle puts down force on the hood also. Once the car rises up to level, the hood on these cars acts like a sail.

Put a thin plate(aluminum) between the grill and the radiator support also to keep air from running up in there.
You can see what they do on the trans am cars;

Do something along the lines of this;


I haven't had to fab up one of these yet.
 

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Okay, now that's just sexy. I don't even think I care if it works or not. I just want it.
 

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I agree that the Trans Am guys had a lot figured out, and the current serious Vintage guys have modernized that path, copying what they are doing will certainly put you on the right path.

If you have a sufficient cooling system during track use, you could start experimenting with limiting the air incoming through the radiator, in conjunction with the chin spoiler (to clean up air below the car) to help minimize the air coming in under the hood and reduce the "sail" effect. The backup hood, along with the rear spoiler/spare truck lid sounds like a good option. In the future once I get lots of other things sorted out, I will be sourcing a functional hood scoop and a spare trunk lid that will have a spoiler/foil on it for autox and track use.

Another thing to check out are all of the high dollar classic pony cars that are playing in the Ultimate Street car series .... tons of aero and venting getting added in to vintage bodies to try and keep up with the aero, cd, and tech assist advantages that the modern cars have (C5/C6 vettes, 5th gen Camaro, Mustangs, and GTr's)

Thanks for all of the replies on here, good info
 

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Discussion Starter #30
I agree that the Trans Am guys had a lot figured out, and the current serious Vintage guys have modernized that path, copying what they are doing will certainly put you on the right path.

If you have a sufficient cooling system during track use, you could start experimenting with limiting the air incoming through the radiator, in conjunction with the chin spoiler (to clean up air below the car) to help minimize the air coming in under the hood and reduce the "sail" effect. The backup hood, along with the rear spoiler/spare truck lid sounds like a good option. In the future once I get lots of other things sorted out, I will be sourcing a functional hood scoop and a spare trunk lid that will have a spoiler/foil on it for autox and track use.

Another thing to check out are all of the high dollar classic pony cars that are playing in the Ultimate Street car series .... tons of aero and venting getting added in to vintage bodies to try and keep up with the aero, cd, and tech assist advantages that the modern cars have (C5/C6 vettes, 5th gen Camaro, Mustangs, and GTr's)

Thanks for all of the replies on here, good info
Agreed - MUCH thanks for all the info!!

And that '70 is PERFECT. Seriously. I need a tissue.

I don't have any cooling issues, even in hot/humid traffic. I USED to, but since I added the flex fan, shroud, Water Wetter, and lower valance cut-out ala R model valance, no probs whatsoever. BUT I had an inkling that the hood was acting like a sail...you'd think my first clue would've been that one time before hood pins and it DID sail up o_O. This was at 38mph. It did a number on my original hood, hinges, and inner aprons.

Funny you would mention OUSCI, as I was all set to do the weekend in Portland in July...until they released the schedule for 2015. Nothing in Portland, just Thunderhill at the end of February. Siskyous in February? No thank you. Killed my whole year, as that's EXACTLY the kind of stuff I love to do with my car. And what it's being set up for :crybaby:. I saw all the final competitors at SEMA, and while a lot of them *were* very high dollar builds, a lot were not. But it was interesting to see their setups at the very least.
 

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Three playing fields in USCAI, the purpose built, just write the check approach owner, the long time non pro racers with some sponsorship, and the Company cars built to sell products.

There is another class of the more grassroots build on a realistic budget, that the TV show likes to highlight. The reality is, you don't win without being in a full built race car with carpet and lights installed, and a serious wheel at the helm.
 

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Thunderhill was a blast! And the Siskyous....where have you been all winter? Not a drop of the white stuff anywhere!

Sparky it sounds like we're headed in the same direction. I'm looking at running Pacific and the Ridge as well as Bremerton...you've got a head start as I'm still putting my junk together. Hopefully I'll be on the road by the end of April and signed up for HPDE shortly after.

:thumbsup:
 

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Discussion Starter #33
Three playing fields in USCAI, the purpose built, just write the check approach owner, the long time non pro racers with some sponsorship, and the Company cars built to sell products.

There is another class of the more grassroots build on a realistic budget, that the TV show likes to highlight. The reality is, you don't win without being in a full built race car with carpet and lights installed, and a serious wheel at the helm.
I'm not looking to win anything. I just want to be better than the guy who's in last place...just a dumb girl in her 50 year old secretary car lol.

Thunderhill was a blast! And the Siskyous....where have you been all winter? Not a drop of the white stuff anywhere!

Sparky it sounds like we're headed in the same direction. I'm looking at running Pacific and the Ridge as well as Bremerton...you've got a head start as I'm still putting my junk together. Hopefully I'll be on the road by the end of April and signed up for HPDE shortly after.

:thumbsup:
Ugh. It was too much of a gamble, and really too far for us. I'm trying to lobby them to bring it back to PIR next year!!! There's a HPDE at The Ridge 5/7 with Hooked on Driving that I'm going to - maybe swing by at the least, say hi, and hitch a ride! :)
 

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Portland was.....not very successful last year. We joked that at least everyone finished in the top 20, hard to run this kind of program with low numbers.
I did hear some chitter chatter at Thunderhill about Oregon Raceway Park, I've never been but it is a bit closer.

:thumbsup:
 

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Discussion Starter #36
Portland was.....not very successful last year. We joked that at least everyone finished in the top 20, hard to run this kind of program with low numbers.
I did hear some chitter chatter at Thunderhill about Oregon Raceway Park, I've never been but it is a bit closer.

:thumbsup:
Could've been that, at least around here, I was the only one in my circle of track friends that even *knew* about the series. Thunderhill adds another 2 total days of travel - and expenses - for me.

I guess my biggest gripe was, if you're going to move it south to CA, move it later in the year (so we don't have to worry about little things like towing in the mountains in winter). :)
 

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Discussion Starter #38
Only can see the first pic, but yes - that's what I'm thinking. The hunt begins!
 

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I dont know if the 65-66's used the core support seal like the 67 up AC and big block cars did but it's only about $20 and can be glued in place. I know temp wise it forces more air through the radiator ,it will also prevent air from packing up under the hood.

The 67 A Sedan Shelbys used it.
 
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