turb06 Dark Knight Mafia Member No. - 666 Member 3,667 Member For: 21y 10m 2d Location: Toowoomba Posted 07/08/04 01:29 PM Share Posted 07/08/04 01:29 PM Cant a mandrel bent system be negated by getting a bigger size pressure bent system.Eg. a 2" mandrel bent exhaust will flow as much as a 2.5" pressure bent. This is what I have heard and have no idea of its accuracy, so someone please set me straight. Link to comment Share on other sites More sharing options...
Blown BA In Your Face Member 6,195 Member For: 21y 9m 19d Gender: Male Location: Peninsula Posted 07/08/04 11:52 PM Share Posted 07/08/04 11:52 PM Guys mandrel bend is when they bend the pipes it is the same diameter and consistency right round the pipe. Link to comment Share on other sites More sharing options...
Guest Guests Posted 08/08/04 02:34 AM Share Posted 08/08/04 02:34 AM Best way of putting it...you have a 2" system,you have a 2"ball that fits snuggly inside the pipeA well made mandrel system will let you drop the ball in... and it will roll through the system and pop out the other endWhen using a press,some of the exact roundness is lost and your ball will get stuck on the first bend,The T has a mandrel bent system from factory and is very good IMO Link to comment Share on other sites More sharing options...
turb06 Dark Knight Mafia Member No. - 666 Member 3,667 Member For: 21y 10m 2d Location: Toowoomba Posted 08/08/04 02:55 AM Share Posted 08/08/04 02:55 AM Best way of putting it...you have a 2" system,you have a 2"ball that fits snuggly inside the pipeA well made mandrel system will let you drop the ball in... and it will roll through the system and pop out the other endWhen using a press,some of the exact roundness is lost and your ball will get stuck on the first bend,The T has a mandrel bent system from factory and is very good IMO ok, if the t has a mandrel bent system out of the factory. Geea's photos of his replacement pipes show its only press bent, so that has to be causing more restrictions than standard or about the same as standard considering you have removed the muffler, unless the replacement pipes are a bigger diameter. Link to comment Share on other sites More sharing options...
geea Site protagonist Lifetime Members 4,320 Member For: 21y 7m 16d Gender: Male Location: At the lights, waiting for you. Posted 08/08/04 03:27 AM Author Share Posted 08/08/04 03:27 AM I'm no expert but I believe that the factory muffler is very restrictive. I think that the pipes inside the muffler are actually smaller than the rest of the exhaust. I also think that the difference in flow between mine and a mandrel bend wouldn't be that great. I think I would still be way ahead of the factory muffler.geea. Link to comment Share on other sites More sharing options...
turb06 Dark Knight Mafia Member No. - 666 Member 3,667 Member For: 21y 10m 2d Location: Toowoomba Posted 08/08/04 03:32 AM Share Posted 08/08/04 03:32 AM I'm no expert but I believe that the factory muffler is very restrictive. I think that the pipes inside the muffler are actually smaller than the rest of the exhaust. I also think that the difference in flow between mine and a mandrel bend wouldn't be that great. I think I would still be way ahead of the factory muffler.geea. I'm sure you would be too. But I wonder if the replacement pipes were made a bigger diameter it would be better agian? I'm getting mine done hopefully on tuesday and I will suss it out with the exhaust shop guy before it gets done. Link to comment Share on other sites More sharing options...
Guest Guests Posted 08/08/04 04:57 AM Share Posted 08/08/04 04:57 AM I'm no expert but I believe that the factory muffler is very restrictive. I think that the pipes inside the muffler are actually smaller than the rest of the exhaust. I also think that the difference in flow between mine and a mandrel bend wouldn't be that great. I think I would still be way ahead of the factory muffler.geea. I'm sure you would be too. But I wonder if the replacement pipes were made a bigger diameter it would be better agian? I'm getting mine done hopefully on tuesday and I will suss it out with the exhaust shop guy before it gets done. If you look at the centre muff youll notice the inlets differ from the outlets,which means it is offset a bit so the gas moving through it has to enter into the muff fiber glass packing,this is a restriction and quietns it,When you look at a hotdog(pic 2 of mine)the in and out pipes are parallel and the gas aint forced to one side like the standard muff,that's why its a bit louder Link to comment Share on other sites More sharing options...
tab Sucker Moderating Team 32,303 Member For: 20y 8m 2d Gender: Male Location: Brisbane Posted 08/08/04 05:35 AM Share Posted 08/08/04 05:35 AM I'm no expert but I believe that the factory muffler is very restrictive. I think that the pipes inside the muffler are actually smaller than the rest of the exhaust. I also think that the difference in flow between mine and a mandrel bend wouldn't be that great. I think I would still be way ahead of the factory muffler.geea. I'm sure you would be too. But I wonder if the replacement pipes were made a bigger diameter it would be better agian? I'm getting mine done hopefully on tuesday and I will suss it out with the exhaust shop guy before it gets done. You have to take into consideration the inside smoothness (for lack of better word) of the pipe as well. In terms of air flow, using a very crude comparison you would be better off with a 1" pipe that is mandrel bent rather than a 2" pipe with a sharp 90 degree bend.You could argue until the cows come home on whether or not the larger pipe will compensate for the absence of a mandrel bend - but you would think so given that we are only talking minor changes in direction of air flow.Trent. Link to comment Share on other sites More sharing options...
Guest ba XR6 Guests Posted 08/08/04 07:48 AM Share Posted 08/08/04 07:48 AM going off the topic a lil bit I have an n/a xr now my whole system is going to be replaced by ford because it keeps rattling real bad, been in 5 times question is do u think they could put a 2'5 inch or something like that just to make is sound a bit beafed up and I could pay the difference Link to comment Share on other sites More sharing options...
teebone Member 183 Member For: 21y 1m 26d Location: South of Melbourne, near the sea Posted 08/08/04 10:06 AM Share Posted 08/08/04 10:06 AM Comparing the T's Centre and Rear mufflers, which is the greater contributer to back pressure? Link to comment Share on other sites More sharing options...
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