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Qik Nip
Joined: 16 Jan 2015 Posts: 130 Location: Kentucky
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Posted: Sun Apr 10, 2016 10:35 am Post subject: Minimum ride height for a 924? |
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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? _________________ '79 NA 924 Land Speed Car
Bonneville G/CPRO record @ 149.825MPH
Arkansas Mile G/CPRO record @ 138.0 MPH
Great Lakes SCCA SM points champion '09,'10,'11 |
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Rasta Monsta
Joined: 12 Jul 2006 Posts: 11724 Location: PacNW
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Posted: Sun Apr 10, 2016 2:08 pm Post subject: |
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In theory, your control arms shouldn't go past horizontal.
Can you add some front aero? Like skirting? _________________ Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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morghen
Joined: 21 Jan 2005 Posts: 8884 Location: Romania
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Posted: Sun Apr 10, 2016 4:40 pm Post subject: |
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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? _________________ https://www.the924.com |
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924RACR
Joined: 29 Jul 2001 Posts: 8815 Location: Royal Oak, MI, USA
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Posted: Sun Apr 10, 2016 9:53 pm Post subject: |
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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! _________________ Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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Qik Nip
Joined: 16 Jan 2015 Posts: 130 Location: Kentucky
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Posted: Mon Apr 11, 2016 12:30 am Post subject: |
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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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_________________ '79 NA 924 Land Speed Car
Bonneville G/CPRO record @ 149.825MPH
Arkansas Mile G/CPRO record @ 138.0 MPH
Great Lakes SCCA SM points champion '09,'10,'11 |
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Fasteddie313
Joined: 29 Sep 2013 Posts: 2596 Location: MI
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Posted: Mon Apr 11, 2016 3:10 am Post subject: |
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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? _________________ 80 Turbo - Slightly Modified
Last edited by Fasteddie313 on Wed Apr 27, 2016 1:24 pm; edited 2 times in total |
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Qik Nip
Joined: 16 Jan 2015 Posts: 130 Location: Kentucky
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Posted: Tue Apr 12, 2016 4:17 am Post subject: |
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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 _________________ '79 NA 924 Land Speed Car
Bonneville G/CPRO record @ 149.825MPH
Arkansas Mile G/CPRO record @ 138.0 MPH
Great Lakes SCCA SM points champion '09,'10,'11 |
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Fifty50Plus
Joined: 28 Feb 2008 Posts: 1361 Location: Washington DC area
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Posted: Tue Apr 12, 2016 5:14 am Post subject: |
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It came on the 1979 924S along with 5 lug and vented rotors. _________________ 1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car |
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Qik Nip
Joined: 16 Jan 2015 Posts: 130 Location: Kentucky
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Posted: Tue Apr 26, 2016 7:55 am Post subject: |
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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 NA 924 Land Speed Car
Bonneville G/CPRO record @ 149.825MPH
Arkansas Mile G/CPRO record @ 138.0 MPH
Great Lakes SCCA SM points champion '09,'10,'11 |
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Fasteddie313
Joined: 29 Sep 2013 Posts: 2596 Location: MI
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Posted: Tue Apr 26, 2016 7:57 am Post subject: |
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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 _________________ 80 Turbo - Slightly Modified |
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Qik Nip
Joined: 16 Jan 2015 Posts: 130 Location: Kentucky
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Posted: Wed Apr 27, 2016 7:26 am Post subject: |
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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? _________________ '79 NA 924 Land Speed Car
Bonneville G/CPRO record @ 149.825MPH
Arkansas Mile G/CPRO record @ 138.0 MPH
Great Lakes SCCA SM points champion '09,'10,'11 |
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