rc0032 Posted January 25, 2007 Share Posted January 25, 2007 Read this then ask Intelligent questions: http://forums.nasioc.com/forums/showthread.php?s=&threadid=443943 Link to comment Share on other sites More sharing options...
AWDxBOOST Posted January 25, 2007 Share Posted January 25, 2007 ive done 7 uppipes so far, some rigid, some flex imo flex FTW Link to comment Share on other sites More sharing options...
NewScooby Posted January 25, 2007 Share Posted January 25, 2007 I went with an Invidia solid uppipe. On of the cheaper upipes at $115 shipped. With thick FLAT flanges. Had it ceramic coated in/out along with my Invidia downpipe, Local ceramic coating place was $116 for both pipes with a 1 year warranty. Installed with new OEM gaskets for no leaks. I think the Flex/solid debate has more to do with the quality of the install than the pipes themselves. Link to comment Share on other sites More sharing options...
SQC049 Posted January 26, 2007 Share Posted January 26, 2007 I used a solid UP on both of my WRXs and have one on my LGT. I've never had a problem. If you install it properly, it doesn't matter which you choose. I'd say 90% for the leaks come from installer error. Super JDM part out: http://legacygt.com/forums/showthread.php?t=65039 PM me an offer! Link to comment Share on other sites More sharing options...
jazzymt Posted January 26, 2007 Share Posted January 26, 2007 I say you two are just lucky and can suck my balls! [CENTER][URL="http://legacygt.com/forums/showthread.php?t=18504"]Subaru Plug & Play Aux-in Mod[/URL][/CENTER] [CENTER][URL="http://www.jazzyengineering.com"]www.jazzyengineering.com[/URL][/CENTER] Link to comment Share on other sites More sharing options...
G.T.Subie Posted January 26, 2007 Share Posted January 26, 2007 flex for less leaks. Denial is your best friend Link to comment Share on other sites More sharing options...
whitetiger Posted January 26, 2007 Share Posted January 26, 2007 I think the Flex/solid debate has more to do with the quality of the install than the pipes themselves. Agreed. Link to comment Share on other sites More sharing options...
GTTuner Posted January 26, 2007 Share Posted January 26, 2007 I bought the Indiva UP pipe. It is solid and I had no problem at all with the install. I considered getting a flex, but if it was of any real benefit Subie would have had it OE IMO. I'm very happy with it, no leaks (11,000mi since install) and it was well constructed in fit and finish. And no, I wont suck your balls! Link to comment Share on other sites More sharing options...
mikeyan Posted January 26, 2007 Share Posted January 26, 2007 never had a problem with my Flow Solid UP (coated) with either my broken @ss borla headers or the stockers. Loosen up at turbo side first, tighten and torque header to block and header to UP first, then finally do the turbo... at least that works for me. Mike SoCal Duck Hunters Club - Unit 52 Link to comment Share on other sites More sharing options...
ogradnis Posted January 26, 2007 Author Share Posted January 26, 2007 I considered getting a flex, but if it was of any real benefit Subie would have had it OE IMO. What are you even doing on this forum if you think that Subaru puts chooses parts to install because they are the best available. I guess you are bone stock and plan to stay that way then? Since when does Stg 2 = Stock? Link to comment Share on other sites More sharing options...
eldiablo Posted January 26, 2007 Share Posted January 26, 2007 I considered getting a flex, but if it was of any real benefit Subie would have had it OE IMO. : Stock UP has flex section... you just can't see it behind all the sheet metal. My VB Garage... Pumping the air back into despair Link to comment Share on other sites More sharing options...
AWDxBOOST Posted January 26, 2007 Share Posted January 26, 2007 I considered getting a flex, but if it was of any real benefit Subie would have had it OE IMO. oem does have a flex if you look under the heatshield Link to comment Share on other sites More sharing options...
GTTuner Posted January 26, 2007 Share Posted January 26, 2007 What are you even doing on this forum if you think that Subaru puts chooses parts to install because they are the best available. I guess you are bone stock and plan to stay that way then? Since when does Stg 2 = Stock? Whats with the flame dude? Did someone piss in your cornflakes this morning? I voted, listed what I had and stated why I went with a solid pipe. I never stated Subaru would use the best. Link to comment Share on other sites More sharing options...
GTTuner Posted January 26, 2007 Share Posted January 26, 2007 Stock UP has flex section... you just can't see it behind all the sheet metal. I did not recall seeing the flex, I stand corrected. Link to comment Share on other sites More sharing options...
VTGT Posted January 26, 2007 Share Posted January 26, 2007 ive done 7 uppipes so far, some rigid, some flex imo flex FTW Was mine giving you a harder time?.. Link to comment Share on other sites More sharing options...
ogradnis Posted January 26, 2007 Author Share Posted January 26, 2007 Whats with the flame dude? Did someone piss in your cornflakes this morning? I voted, listed what I had and stated why I went with a solid pipe. I never stated Subaru would use the best. As a matter of fact my cat is in heat and she did piss on my favorite belt yesterday; however, I apologize for the way that came across. I didn't intend to sound like so much of an asshole. I was just trying to pick on you a little. In any case. I also did not know the stock UP had a flex section. Link to comment Share on other sites More sharing options...
GTTuner Posted January 26, 2007 Share Posted January 26, 2007 As a matter of fact my cat is in heat and she did piss on my favorite belt yesterday; however, I apologize for the way that came across. I didn't intend to sound like so much of an asshole. I was just trying to pick on you a little. In any case. I also did not know the stock UP had a flex section. Absolutly no offense taken....we all have a "bad pill day" now and then. I had to keep looking back to see if I had said something rude . (which ocasionaly I do!) I had to dig up my old UP pipe just to satisfy my curiosity about the flex. Link to comment Share on other sites More sharing options...
eldiablo Posted January 29, 2007 Share Posted January 29, 2007 Spoke to Rich at Precision Tuning - he prefers the solid Perrin pipes. They install up-pipes all the time and see less leak issues with solid pipes like Perrin / Invidia than they do with flex pipes of lesser quality. Apparently the flex units cost less to make as they require less exacting engineering tolerances. My VB Garage... Pumping the air back into despair Link to comment Share on other sites More sharing options...
mickeyd2005 Posted January 29, 2007 Share Posted January 29, 2007 If you're going to get a solid uppipe, don't get the Perrin. The Perrin is a butt weld. The pipe is butted against the flange and then welded. Any bending or flexing is taken by the fillet weld in tension. This might be fine for a downpipe or CBE, but the uppipe is very hot. The high temperatures will weaken the weld and the bending stresses will eventually cause it to crack. I have one on my workbench as a classic example. It failed sometime between 12,000 and 15,000 miles. You can help this by coating the ID of the pipe. This will reduce the temperatures at the weld. The better solution is to get a Cobb cast or Crucial. The Crucial is different because the pipe goes all the way through the flange. It is then spot welded on the outside to hold it in place and then a full weld on the inside. It is then fully coated. 20 years ago, in my college strain gage lab, the pipe weld on a flange was used as a classic example. We tested the difference in strain on the weld if we butt weld or insert the pipe into the flange. It was an order of magnitude difference in stresses on the weld. Link to comment Share on other sites More sharing options...
jazzymt Posted January 29, 2007 Share Posted January 29, 2007 mickey - you must not use welding much in your current job. The weld you describe on the Perrin pipe is a fillet weld and is the strongest weld you can use. Crucial's pipe is fillet welded on the inside vs. the outside is all. A butt weld is when two parrallel objects are butted against eachother and you weld along the seam - which as you state, is one of the worst forms of welds...mostly because of the poor penetration & depth of fusion it provides. Beveled edges are required to make a good weld in that case, but then it's no longer a butt weld, it's a bevel weld. There are several other reasons why the Perrin weld might have failed though, probably contaminants or not enough heat input to get good fusion. [CENTER][URL="http://legacygt.com/forums/showthread.php?t=18504"]Subaru Plug & Play Aux-in Mod[/URL][/CENTER] [CENTER][URL="http://www.jazzyengineering.com"]www.jazzyengineering.com[/URL][/CENTER] Link to comment Share on other sites More sharing options...
mickeyd2005 Posted January 29, 2007 Share Posted January 29, 2007 You are right that I don't do any welding in my current job. However, this is almost the exact same configuration that we tested in college. In that case, we were checking the weld on a pole. My terminology is probably incorrect. The weld did not fail in our test. We strain gaged it and were measuring strain not failure. The fillet weld may be strong, but the stresses are higher because of the configuration. Here is a sketch of what I am talking about. Link to comment Share on other sites More sharing options...
Scooter Posted January 29, 2007 Share Posted January 29, 2007 Crucial seems to do something slightly different, with smooth flow being the primary goal: http://www.legacygt.com/forums/showthread.php?t=44188 Seek first to understand, then to be understood. In other words: SEARCH before you post! Link to comment Share on other sites More sharing options...
mickeyd2005 Posted January 29, 2007 Share Posted January 29, 2007 The sketch I have above is based upon the Crucial uppipe that I bought from jazzymt. Link to comment Share on other sites More sharing options...
Scooter Posted January 29, 2007 Share Posted January 29, 2007 Hmmm... the pictures on the Crucial website don't look exactly like your sketch. Close, though. Looks like Crucial does not stick the pipe quite all the way through the flange, but rather leaves it 1/4" short or so and welds there, inside the hole in the flange - probably to keep the weld away from the flat surface of the flange. The Corky Bell sketch describes it better than the pix. Same idea, I guess, and I agree that it's the superior technique. Seek first to understand, then to be understood. In other words: SEARCH before you post! Link to comment Share on other sites More sharing options...
AWDxBOOST Posted February 3, 2007 Share Posted February 3, 2007 heres a pic of stock with and without the heatshields on (from autospeed) http://www.autospeedperformance.com/subaru/up-pipe8.jpg Link to comment Share on other sites More sharing options...
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