Is a flex tube 100% necessary on the DP?
11-10-2009, 09:16 PM
#21
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Seriously dude I was just thinking that. This turbotim guy doesn't know his *** from a hole in the ground when it comes to fabrication. 
Thanks guys, i'm going to fearlessly procede without a flex pipe and will make sure I have one in place before my first track day next season. This saves me some cash for sure that can go toward some bitchin hardware or something.
Thanks guys, i'm going to fearlessly procede without a flex pipe and will make sure I have one in place before my first track day next season. This saves me some cash for sure that can go toward some bitchin hardware or something.
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11-10-2009, 09:28 PM
#24
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The whole deal with not running a flex in my system relies on the length between supports. in my case, it's long--basically the head to the one behind the rear o2 sensor somewhere (I forget and am above the car currently). That's a pretty long lever arm and it doesn't make the rest of the system move much.
Attaching it to the tranny shortens that lever arm. Also if you just do the easy "tack on a hanger rod" method, it focuses a lot of stress at one point. result: a hole ripped in your pipe where the hanger was.
Attaching it to the tranny shortens that lever arm. Also if you just do the easy "tack on a hanger rod" method, it focuses a lot of stress at one point. result: a hole ripped in your pipe where the hanger was.
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11-10-2009, 09:32 PM
#26
Haven't had a flex pipe for months now and I have a hanger attached to the trans tail. No issues so far.
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11-10-2009, 11:42 PM
#29
Not that it's any scientific proof, but FM does not use flex joints in their downpipes and who knows how many they've shipped and are used. From their website:
"The pipes are cut and bent on a massive CNC (computer numerical control) pipe bender for consistency and accuracy. Due to the accuracy of the process, we were able to remove a heavy, expensive flex joint that was also a potential failure point."
"The pipes are cut and bent on a massive CNC (computer numerical control) pipe bender for consistency and accuracy. Due to the accuracy of the process, we were able to remove a heavy, expensive flex joint that was also a potential failure point."
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11-10-2009, 11:44 PM
#31
Actually since I've always had daily drivers I only put about 1k miles on my miata since the day I BOUGHT IT. 95% of those miles are WOT pulls though
I sold my suby though, so as soon as the motor is back in, the miata will be getting daily useage.
My 6 speed showed up today. I want to make love to it.
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11-11-2009, 01:58 AM
#35
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I don't have one. Greddy cast manifold, greddy turbo, the used kit came with a custom 2.5" DP, bolted to 2.5" mid pipe that's welded to a 2.5" cat, then VTA. I had more pipe after the cat going to a magnaflow muffler for about a year, and so far about 1.5 year without the muffler, a dozen or more track days, no cracking.
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11-11-2009, 02:33 AM
#36
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Interesting debate.
I seem to want to agree with both sides as with having a car that sits pretty low hitting the exhaust seems to be pretty common and I imagine having that shock being able to be absorbed by a flex tube placed at the right spot in the system seems like it would do the job of saving parts in the long run.
My current downpipe is my exhaust and isnt but the distance from the turbine outlet to in front of the drivers side tire. No flex for me until I get the full 3in out the back. Im just worried about hitting hard things in the road.
I seem to want to agree with both sides as with having a car that sits pretty low hitting the exhaust seems to be pretty common and I imagine having that shock being able to be absorbed by a flex tube placed at the right spot in the system seems like it would do the job of saving parts in the long run.
My current downpipe is my exhaust and isnt but the distance from the turbine outlet to in front of the drivers side tire. No flex for me until I get the full 3in out the back. Im just worried about hitting hard things in the road.
Last edited by Tw34k; 11-11-2009 at 04:01 AM.
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I use a $80 "turbo" flex with the smooth inside.
