Underdog Posted November 21, 2008 Share Posted November 21, 2008 Keep in mind that aluminum is stiffer than steel (and lighter). I would guess that there is no major difference between the two, since any brace will be much better than none. The additional gussets on the SPT part do contribute to a beefier "look" though. The Crimson Dynamo Link to comment Share on other sites More sharing options...
vet Posted November 21, 2008 Share Posted November 21, 2008 Anybody using the STI shift linkage bushing? Link to comment Share on other sites More sharing options...
CTATV Posted November 21, 2008 Share Posted November 21, 2008 Anybody using the STI shift linkage bushing? im going to be getting the STi STS maybe i should do the bushing while im in there Link to comment Share on other sites More sharing options...
GTkansan Posted November 21, 2008 Share Posted November 21, 2008 The statement of aluminum and steel strength is fairly strange.... There can be a HUGE variety of steel and aluminum compounds being used for bracing. Its not easy to say which is stronger without know the allow and the treatment type (forged, rolled, etc). Some crap steel is a lot weaker than even t6061 aluminum. Link to comment Share on other sites More sharing options...
GTkansan Posted November 21, 2008 Share Posted November 21, 2008 This is not to mention that the 2nd moment for the cusco brace is likely much larger for the cusco version than that of the SPT. The support this brace provides is torsional more than compression/extension, and thus the moment of the inertia is more important. This is exactly why you use an I shaped beam to support a floor, as opposed to a rectangular section beam. The larger the moment of inertia, the more bending strength you get... I'd go with cusco (depending on the two materials of course). Link to comment Share on other sites More sharing options...
Underdog Posted November 21, 2008 Share Posted November 21, 2008 The statement of aluminum and steel strength is fairly strange.... There can be a HUGE variety of steel and aluminum compounds being used for bracing. Its not easy to say which is stronger without know the allow and the treatment type (forged, rolled, etc). Some crap steel is a lot weaker than even t6061 aluminum. You are right, I was generalizing. My assumption was based on a 4140 series alloy steel versus maybe a 3003 aluminum. I wasn't trying to say that the aluminum was stronger than the steel, just more rigid, which is generally true. And yes, the cross section of the brace also plays a large part in it's function . The Crimson Dynamo Link to comment Share on other sites More sharing options...
hassa Posted November 21, 2008 Share Posted November 21, 2008 This is not to mention that the 2nd moment for the cusco brace is likely much larger for the cusco version than that of the SPT. The support this brace provides is torsional more than compression/extension, and thus the moment of the inertia is more important. This is exactly why you use an I shaped beam to support a floor, as opposed to a rectangular section beam. The larger the moment of inertia, the more bending strength you get... I'd go with cusco (depending on the two materials of course). LOL!!!! Let me guess, you're an undergrad engineering student - right? Link to comment Share on other sites More sharing options...
GTkansan Posted November 21, 2008 Share Posted November 21, 2008 hahah nope. Im finally about to finish my PhD. Link to comment Share on other sites More sharing options...
Opie Posted November 21, 2008 Author Share Posted November 21, 2008 Anybody using the STI shift linkage bushing? It is not available yet... Link to comment Share on other sites More sharing options...
goneskiian Posted November 21, 2008 Share Posted November 21, 2008 ^^^ Is it basically the same as the COBB bushing? Link to comment Share on other sites More sharing options...
vet Posted November 22, 2008 Share Posted November 22, 2008 ^^^ Is it basically the same as the COBB bushing? I wouldn't think so because it's only listed as fitting the STI short shifter. The front shifter bushing is the same for the STI and the stock shifter. Link to comment Share on other sites More sharing options...
goneskiian Posted November 22, 2008 Share Posted November 22, 2008 I believe they're all the same. The only difference between the STi STS and the stock one is that the shifter lever has the pivot a bit higher up the shaft (think Kartboy or COBB). Link to comment Share on other sites More sharing options...
RobY Posted November 22, 2008 Share Posted November 22, 2008 Keep in mind that aluminum is stiffer than steel (and lighter). Only if the steel has a MUCH thinner wall diameter. Given the same wall thickness steel is both MUCH stiffer, MUCH stronger, and MUCH heavier. I used to be into mountain biking. To get the same structural rigidity and strength of steel aluminum has to be at least twice as thick contributing to the rigidity of the frame. Where aluminum saves weight is the fact that you can use twice as much and still end up with a piece that still weighs less than steel that was made with half as much material. Link to comment Share on other sites More sharing options...
Matty B Posted September 22, 2009 Share Posted September 22, 2009 What's with the off-highway warning on the documentation? IMPORTANT INFORMATION REGARDINGYOUR SOA8431120, 08 IMPREZA WRX, 08IMPREZA WRX STI, 05-08 LEGACY 2.5GT,06-08 LEGACY SPEC B, AND 09 FORESTERXT SPT LOWER CHASSIS BRACE.“This part is covered by the Parts Only LimitedWarranty for Select Genuine SubaruPerformance Parts (Labor Excluded). Partsintended for off-highway application only. Maybring vehicle out of compliance withsafety/emissions standards. Can only be lawfullyinstalled by end user. See dealer for complete warranty details.” http://techinfo.subaru.com/html/downloadFree.jsp?doc_id=219712 Link to comment Share on other sites More sharing options...
leggtnut Posted September 22, 2009 Share Posted September 22, 2009 one word... CYA Ben (2014 Outback SAP w/ eyesite, 2014 Tribeca Limited, 2006 LGT limited sedan) Subaru Ambassador PNW Link to comment Share on other sites More sharing options...
slimjoe Posted September 22, 2009 Share Posted September 22, 2009 Holy old thread. Not as old as some others that were dug up. Anyways, that's there just to cover their asses. It just says it's a non-standard part and if anything fails, it's not their fault. Link to comment Share on other sites More sharing options...
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