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that looks good, Reaper
did you make any measurements during your testing? or is the above based on subjective feel? |
We haven't done any static measurements, our testing is based on cornering speed & gmeter readings. One thing we noticed is that before we could get near the threshold of grip for the tires the front end would wash out and understeer due to all the load being transferred to the outside tire and eventually it breaking loose.
Cornering speeds were on average 12 mph faster on a normal 45 mph corner. Static load tests are in the works, just have to find some time when I get out to Cali to do it. |
Perusing speedhunters and noticed this original RSR trunk shot with bracing:
http://forums.pelicanparts.com/uploa...1298722918.jpg CAR SPOTLIGHT>> HOTCHKIS LE MANS '73 PORSCHE 911 - Speedhunters |
Following up on Reaper930's comments about how the 935's were big-time altered in the front to have them require more focus on needing an X-brace....this photo may help illustrate that point --->
http://forums.pelicanparts.com/uploa...1298730381.jpg |
Some discussion of the effectiveness of strut braces, with measurements here:
http://forums.pelicanparts.com/porsche-911-technical-forum/130622-strut-braces-what-do-you-think.html |
from 45 mph to 57 mph??? !!
thx for the info |
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JR |
Javadog:
No argument.... My statement and picture was simply reinforing the point made that the 935's were shown often with the cross "X" brace...moreso than earlier Porsche racing cars. Reaper reminds us that it is precisely the fact that the 935's evolved to such a point that removed so much sheet metal, that they ended up using the X-brace more than earlier cars would have required. |
Thank you all for this information! This was much more than I expected when i posted this thread, but I have learned a lot! This type of knowledge in this forum is one of the things that makes me check what happens here every day. Thank you all!!
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BTW - ultrasonic or even laser distance measuring devices became small, compact, and "cheap" in the 1980s - a suitably motivated individual could measure deflection dynamically - as the car cornered and went thru bumps etc.
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It's just fun and pride to engineer your own porsche for whatever the reason. I enjoy that everyone has the passion and creativity to do something with their cars at any level instead of them rotting away and destine to be a parts car from neglect. Home builders rock in my book and so do porsche owners of all styles and flavors.
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it is just for fun, but what fun we have!!! like Draden's car, you try to balance out the front to the rear in wow factor (well done). Doubt anyone is seriously tracking a 70's era car now a days.
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Chasing dishwashers is super fun :) |
By hinging one of the cross-braces at the mid-span with the plate/bolts, you effectively lose the compressive stiffness of that brace. Just curious why you did not simply run the brace over/under the other one?
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There are thousands and thousands of early 911s out there right now that are seriously raced!!SmileWavy Seriously.http://forums.pelicanparts.com/suppo...ool_shades.gif
[QUOTE=James Brown; Doubt anyone is seriously tracking a 70's era car now a days.[/QUOTE] |
You know what, with all the home made and custom shop engineered front bracing of the 911 we've seen, I don't think Chuck at Elephant Racing has too much to worry about. http://forums.pelicanparts.com/support/smileys/smi3.gif His system is well thought out, well executed, looks great, and not really all that expensive. There are a lot of people that are bound to make their own and I applaud that (hell I am one), but I think there are plenty more that his system is perfect for.
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Por que!
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The car in the video is a '79 930 Some of the cars it passes were the latest and greatest GT3 Cups, RS RSR iterations of GT3 etc... These vids are old now.... Yet the '79 warhorse still lives at the pointy end of the field... Roebling 2007 The Glen 2005 Development still continues on the chassis and powertrains of these wonderful machines. |
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