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Minimum ride height for a 924?

 
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Qik Nip  



Joined: 16 Jan 2015
Posts: 116
Location: Kentucky

PostPosted: Sun Apr 10, 2016 11:35 am    Post subject: Minimum ride height for a 924? Reply with quote

My question has to do with readying the car (its a 1979 924) for Bonneville (where air resistance is everything). LSR aero guru's tell me that the closer the car is to the ground, the lower the effective frontal area and its air resistance.

Looking at the car's front suspension camber adjustment excentrics, it appears that the ability to offset the added camber that comes with lowering the front end is pretty limited.

My question then, is how low can I go and still get back to a fairly zero degree camber setting with that available adjustment?
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Rasta Monsta  



Joined: 12 Jul 2006
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PostPosted: Sun Apr 10, 2016 3:08 pm    Post subject: Reply with quote

In theory, your control arms shouldn't go past horizontal.

Can you add some front aero? Like skirting?
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morghen  



Joined: 21 Jan 2005
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Location: Romania

PostPosted: Sun Apr 10, 2016 5:40 pm    Post subject: Reply with quote

I'm not an expert but your front area will still be the same lowered or not.
If you dont want air under the car you can lower it a bit and use a front lip.
You can lower it about an inch and still get 0 deg camber or very close if i'm not mistaken.
Can you get us some pictures of the car being prepared for this?
I'm guessing you're going without mirrors, the 924 small spoiler hatch, filled/closed panel gaps..right?
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924RACR  



Joined: 29 Jul 2001
Posts: 8102
Location: Royal Oak, MI, USA

PostPosted: Sun Apr 10, 2016 10:53 pm    Post subject: Reply with quote

For what you're doing... who cares?

If the camber adjustment becomes a problem - camber plates are the answer.

Ours are past horizontal - and we turn!
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Qik Nip  



Joined: 16 Jan 2015
Posts: 116
Location: Kentucky

PostPosted: Mon Apr 11, 2016 1:30 am    Post subject: Reply with quote

morghen wrote:
I'm not an expert but your front area will still be the same lowered or not.

I thought the same thing, but the experienced land racers I talk to tell me that the effect of lowering a 72" wide car two inches (144 square inches) is effectively like reducing the frontal area by a square foot. Most LSR cars run absolutely as close to the ground as possible and that appears to be the reason.

If you don't want air under the car you can lower it a bit and use a front lip.

Unfortunately the class I'm running (Classic Production) forbids any non stock body additions / changes, so no air dam. I am runnning the stock lip.


Can you get us some pictures of the car being prepared for this?
I'll post one when I figure out the process.

I'm guessing you're going without mirrors, the 924 small spoiler hatch, filled/closed panel gaps..right?

Mirror removal is permitted but as mentioned above, no aero changes are authorized- to include taping up the body seams.

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'96 LT4 C4 daily driver
Great Lakes SCCA SM points champion '09,'10,'11
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Fasteddie313  



Joined: 29 Sep 2013
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PostPosted: Mon Apr 11, 2016 4:10 am    Post subject: Reply with quote

IIRC you could order an NA with the 931 rear spoiler and that spoiler reduced CD.

Can you add one if it was an original option?
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Last edited by Fasteddie313 on Wed Apr 27, 2016 2:24 pm; edited 2 times in total
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Qik Nip  



Joined: 16 Jan 2015
Posts: 116
Location: Kentucky

PostPosted: Tue Apr 12, 2016 5:17 am    Post subject: Reply with quote

Fasteddie313 wrote:
IIRC you could order an NA with the 931 rear spoiler and that spoiler reduced CD.

Can you add one if it was an original option?


Eddie:
My understanding of the class rule is that if the 931 spoiler was factory option that could be ordered on the car from the factory, it is permissible. If it was a dealer add on, it's not. Was it a factory option available on the 79 NA car?
Rick
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'96 LT4 C4 daily driver
Great Lakes SCCA SM points champion '09,'10,'11
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Fifty50Plus  



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PostPosted: Tue Apr 12, 2016 6:14 am    Post subject: Reply with quote

It came on the 1979 924S along with 5 lug and vented rotors.
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Qik Nip  



Joined: 16 Jan 2015
Posts: 116
Location: Kentucky

PostPosted: Tue Apr 26, 2016 8:55 am    Post subject: Reply with quote

Fifty50Plus wrote:
It came on the 1979 924S along with 5 lug and vented rotors.


Eddie.
Thanks. That's what I suspected. Not legal on my NA car.
Rick
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'96 LT4 C4 daily driver
Great Lakes SCCA SM points champion '09,'10,'11
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Fasteddie313  



Joined: 29 Sep 2013
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PostPosted: Tue Apr 26, 2016 8:57 am    Post subject: Reply with quote

Qik Nip wrote:
Fifty50Plus wrote:
It came on the 1979 924S along with 5 lug and vented rotors.


Eddie.
Thanks. That's what I suspected. Not legal on my NA car.
Rick


79 924S was an NA..

S was just an options package for the big breaks/5 lug and the spoiler on the NA
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Qik Nip  



Joined: 16 Jan 2015
Posts: 116
Location: Kentucky

PostPosted: Wed Apr 27, 2016 8:26 am    Post subject: Reply with quote

Fasteddie313 wrote:
Qik Nip wrote:
Fifty50Plus wrote:
It came on the 1979 924S along with 5 lug and vented rotors.


Eddie.
Thanks. That's what I suspected. Not legal on my NA car.
Rick


79 924S was an NA..

S was just an options package for the big breaks/5 lug and the spoiler on the NA


Hmmm. Now where to find said parts?
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'79 NA 924 Land Speed Car
Bonneville G/CPRO record holder @ 149.825MPH
'96 LT4 C4 daily driver
Great Lakes SCCA SM points champion '09,'10,'11
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