GTTuner Posted February 12, 2007 Share Posted February 12, 2007 I was carefully looking at my stock UP pipe yesterday and there is no flex section what-so-ever. Link to comment Share on other sites More sharing options...
whitetiger Posted February 12, 2007 Share Posted February 12, 2007 Its under the heatsheild. All stock UPs have a flex section. Link to comment Share on other sites More sharing options...
eldiablo Posted February 12, 2007 Share Posted February 12, 2007 I was carefully looking at my stock UP pipe yesterday and there is no flex section what-so-ever. Take a look at the post right above yours to see the stock unit with heatshield removed (#50). Did you buy your car new? Maybe it's aftermarket? My VB Garage... Pumping the air back into despair Link to comment Share on other sites More sharing options...
mccorry Posted February 12, 2007 Share Posted February 12, 2007 Flex FTW. Link to comment Share on other sites More sharing options...
AWDxBOOST Posted February 12, 2007 Share Posted February 12, 2007 I was carefully looking at my stock UP pipe yesterday and there is no flex section what-so-ever. gotta pry off the heatshields to see it Link to comment Share on other sites More sharing options...
muddy02 Posted February 12, 2007 Share Posted February 12, 2007 Read this then ask Intelligent questions: http://forums.nasioc.com/forums/showthread.php?s=&threadid=443943 that's a great thread. We should have soemthing like that, it's waht i've been looking for for weeks. Thanks! It's not about speed, it's about acceleration! Link to comment Share on other sites More sharing options...
GTTuner Posted February 12, 2007 Share Posted February 12, 2007 heres a pic of stock with and without the heatshields on (from autospeed) http://www.autospeedperformance.com/subaru/up-pipe8.jpg Look INSIDE the pipe. It is solid, no flex! I'll take pic's of mine tonight. Link to comment Share on other sites More sharing options...
magnus617 Posted February 12, 2007 Share Posted February 12, 2007 why do they have that ribbed section for, if it's solid on the inside of the pipe? never, under any circumstances, take sleeping pills at the same time as a laxative. Link to comment Share on other sites More sharing options...
BLACKonBLACK Limited Posted February 12, 2007 Share Posted February 12, 2007 heat reduction ?? Link to comment Share on other sites More sharing options...
AWDxBOOST Posted February 12, 2007 Share Posted February 12, 2007 ^ exactly magnus trust me, its a flex gttuner, it wont look like it from the inside Link to comment Share on other sites More sharing options...
mickeyd2005 Posted February 12, 2007 Share Posted February 12, 2007 Some flex uppipes will have a liner inside it. The liner is only welded on one side. It's to provide a smoother air flow. That doesn't mean it's not a flex. The APS is like that. http://www.finelineimports.net/images/APS_Turbo_Up_Pipe3.jpg Link to comment Share on other sites More sharing options...
AWDxBOOST Posted February 12, 2007 Share Posted February 12, 2007 funny, i was JUST looking for that pic thanks! Link to comment Share on other sites More sharing options...
JDM-STI Posted March 14, 2007 Share Posted March 14, 2007 Anyone know what the inside diameter is on this APS UP? Some flex uppipes will have a liner inside it. The liner is only welded on one side. It's to provide a smoother air flow. That doesn't mean it's not a flex. The APS is like that. http://www.finelineimports.net/images/APS_Turbo_Up_Pipe3.jpg 05 STI CGM~520whp/463wtq...more to come! 08 STI Aspen White/Gold BBS~305whp/365wtq:D Both tuned by Scott Siegel! Link to comment Share on other sites More sharing options...
ScoopMan Posted March 16, 2007 Share Posted March 16, 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. The strongest weld is a full penetration groove weld, not a fillet weld, since it fuses the full thickness of the base metal. Standard welding terminology refers to butt JOINTS, which can be welded many ways. A fillet weld all around is the usual way to connect a pipe to a flange, it is a balanced connection and normally should not fail. I have also spec'd full pen groove welds all around though. Sometimes it is possible to OVER weld, leaving residual stresses that can cause a crack to start. That can be taken care of by stress relieving (heat treatment) after fabrication. I am a structural engineer and spec welds routinely. That being said, the stuff I design does not need to take these temperatures. I am also quite interested in finding out what the best up pipe is...flex seems to make sense to me, but what about the flow? Link to comment Share on other sites More sharing options...
GTTuner Posted March 16, 2007 Share Posted March 16, 2007 We have been debating the fact that the stock UP has a flex. Yes I see the area under the heatshield, but if you look inside the pipe in that area it is a solid tube. Am I missing something? Link to comment Share on other sites More sharing options...
eldiablo Posted March 16, 2007 Share Posted March 16, 2007 We have been debating the fact that the stock UP has a flex. Yes I see the area under the heatshield, but if you look inside the pipe in that area it is a solid tube. Am I missing something? Look closely at the cut-away images posted in this thread. There is indeed a solid pipe inside there, but it is surrounded with a flex section. My VB Garage... Pumping the air back into despair Link to comment Share on other sites More sharing options...
eldiablo Posted March 16, 2007 Share Posted March 16, 2007 other pics gone... here you go. APS calls it the "internal stainless steel endurance tube" My VB Garage... Pumping the air back into despair Link to comment Share on other sites More sharing options...
ScoopMan Posted March 16, 2007 Share Posted March 16, 2007 That APS looks like a very fine piece. Anybody out there who has one that can say anything about how they like it? Link to comment Share on other sites More sharing options...
legacychick Posted March 16, 2007 Share Posted March 16, 2007 I've got a Bosal up. No install problems, no leaks, not too expensive, looks stock! Link to comment Share on other sites More sharing options...
GTTuner Posted March 16, 2007 Share Posted March 16, 2007 why do they have that ribbed section for, if it's solid on the inside of the pipe? ^^^^^My point exactly. I will take some pictures of inside the pipe tonight. Link to comment Share on other sites More sharing options...
eldiablo Posted March 17, 2007 Share Posted March 17, 2007 From the APS web-site... "With an innovative internal 321 stainless steel Endurance Flow Tube, the external Double Wall 321 Stainless Steel flex is insulated from high exhaust gas temperature to ensure total durability - whilst providing a stress free coupling between the exhaust manifold and turbocharger. Precision TIG welded into the entry flange, the smooth internal profiled Endurance Flow Tube also enhances exhaust gas flow for even greater horsepower and throttle response - especially when compared with up-pipes using a traditional flex coupling." My VB Garage... Pumping the air back into despair Link to comment Share on other sites More sharing options...
JDM-STI Posted March 18, 2007 Share Posted March 18, 2007 I guess no one knows the inside diameter of the APS pipe. I cant even get APS to respond in an email. 05 STI CGM~520whp/463wtq...more to come! 08 STI Aspen White/Gold BBS~305whp/365wtq:D Both tuned by Scott Siegel! Link to comment Share on other sites More sharing options...
GTTuner Posted March 19, 2007 Share Posted March 19, 2007 other pics gone... here you go. APS calls it the "internal stainless steel endurance tube" After some examination I have figuired it out. Technically, it does not "FLEX". It is a "telescopic" type connection which allows the pipe's length to expand and contract with temp changes. I have the solid Indiva pipe, I wonder what will crack first, the header pipe, up pipe, or the turbo flange?? Link to comment Share on other sites More sharing options...
CMull123 Posted March 28, 2007 Share Posted March 28, 2007 This thread is exactly what I was lookin for!! Thanks for everyones inputs, and the install walkthroughs on nabisco. (Edited for my stupidness-osity) Link to comment Share on other sites More sharing options...
schwinn Posted April 1, 2007 Share Posted April 1, 2007 With all the issues I have had with a fixed-UP, I would probably go flex next time... or replace this one with a flex, if it continues to give me leaks at the exhaust gaskets. I needed 2 gaskets to make up the distance between the UP and the manifold... and this was after loosening the turbo and trying to get it all together. Still, maybe I am doing something wrong, but flex seems better in my case - whether it's my fault or not Link to comment Share on other sites More sharing options...
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