Miata Turbo Forum - Boost cars, acquire cats.
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Miata Turbo Forum - Boost cars, acquire cats. (https://www.miataturbo.net/)
-   DIY Turbo Discussion (https://www.miataturbo.net/diy-turbo-discussion-14/)
-   -   Is a flex tube 100% necessary on the DP? (https://www.miataturbo.net/diy-turbo-discussion-14/flex-tube-100%25-necessary-dp-41044/)

wayne_curr 11-11-2009 01:09 PM
hard-mounting to the transmission is also not a good idea.

http://www.boostedmiata.com/gallery2...serialNumber=1

Braineack 11-11-2009 01:11 PM
:)

Bond 11-11-2009 01:42 PM
Originally Posted by Braineack (Post 481033)
:)
lol. :brain:

Two of my exhaust hangars broke which inevitably lead to my manifold stud failures. Tack welding hangars is FTL.

hustler 11-11-2009 02:43 PM
Originally Posted by TurboTim (Post 480714)
Ouch.

I am pretty sure none of the 'street' manifolds I have done have a flex section except for Evan's MSM; everyone else was too cheap ;) None of them have cracked.

I now require them on the 'track' downpipes I do.
What a dumb place to cut corners.

Originally Posted by 18psi (Post 480720)
Careful not to seize your Motec muffler bearings though
lol

Rennkafer 11-11-2009 05:01 PM
Originally Posted by TurboTim (Post 480714)
I am pretty sure none of the 'street' manifolds I have done have a flex section except for Evan's MSM; everyone else was too cheap ;) None of them have cracked.
Maybe it's not such a bad place to get cheap given none of them have cracked.

I'd also point out that FM's current DP's don't have flex sections like they used to. Do they have a reputation for breaking?

ARTech 11-12-2009 11:36 PM
I'd like to point out FM uses a 100lb cast dp elbow.

"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."

Ironic isn't it. "We saved 3lbs on your downpipe by adding a 20lb elbow."

Rennkafer 11-13-2009 01:10 AM
Originally Posted by ARTech (Post 481929)
I'd like to point out FM uses a 100lb cast dp elbow.

"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."

Ironic isn't it. "We saved 3lbs on your downpipe by adding a 20lb elbow."
I have one.. the cast piece isn't light but I'd put money on there being less than 6-7lbs of difference.

What I asked wasn't whether it's heavier but whether the current FM downpipe tends to break. If your only answer is useless sarcasm why bother.

p51hellfire 11-13-2009 02:43 AM
butt hurt much....^^

hustler 11-13-2009 10:05 AM
Originally Posted by Rennkafer (Post 481942)
If your only answer is useless sarcasm why bother.
Sandy vagina fail.

ARTech 11-13-2009 11:20 AM
lol

Guess I have to spell it out for you. It can't break because they use a heavy wall, cast iron piece. FM has no place in this conversation because no one else uses a cast elbow. Just because they don't use one, doesn't mean one is not needed.

Tim on the other hand makes a fabricated piece, so if he doesn't use a flex, maybe one isn't needed. Either way, I'll take my cheap insurance.

jayc72 11-13-2009 11:27 AM
My fabricated Greddy replacement DP didn't have a flex, and never had a problem with it (neither did the original DP either). My BEGI does have a flex and I wish it didn't. The flex is significantly larger than the 2.5" pipe leaving very little clearance around it, so getting the DP in a place where the flex doesn't rub is difficult.

y8s 11-13-2009 11:40 PM
honda civic doesn't have a flex...

zoomin 11-14-2009 01:42 PM
Originally Posted by Full_Tilt_Boogie (Post 480671)
I think its needed, especially the way the BP shakes, its not the smoothest engine in the world
Shakes? More like you probably have bad motor mounts.

zoomin 11-14-2009 01:45 PM
For the record, I haven't had a flex pipe on any of the 3 turbo setups I have used and had no issues with cracking. But I also never attached it at the transmission and had good motor mounts.

zoomin 11-14-2009 01:47 PM
Originally Posted by Bond (Post 481063)
lol. :brain:

Two of my exhaust hangars broke which inevitably lead to my manifold stud failures. Tack welding hangars is FTL.
Common sense....

ARTech 11-14-2009 02:08 PM
Every other car I've owned, civic included, had some form of flex joint from the factory between the manifold and exhaust. Most OEMs use a donut and spring bolts.

I think Full-Tilt meant vibrating, not shaking. Not sure stiffer mounts would help there.

y8s 11-14-2009 02:45 PM
Originally Posted by y8s (Post 482308)
honda civic doesn't have a flex...
Originally Posted by ARTech (Post 482431)
Every other car I've owned, civic included, had some form of flex joint from the factory between the manifold and exhaust. Most OEMs use a donut and spring bolts.

I think Full-Tilt meant vibrating, not shaking. Not sure stiffer mounts would help there.
duh youre right. and dammit when i swapped midpipes i forgot the donuts.

triple88a 11-14-2009 02:51 PM
Originally Posted by jayc72 (Post 482029)
My BEGI does have a flex and I wish it didn't. The flex is significantly larger than the 2.5" pipe leaving very little clearance around it
Why do you need clearance at that location? I have a begi downpipe as well with a flex pipe and has had 0 problems with clearance around the flex pipe.

jayc72 11-15-2009 01:31 PM
Originally Posted by triple88a (Post 482448)
Why do you need clearance at that location? I have a begi downpipe as well with a flex pipe and has had 0 problems with clearance around the flex pipe.
NB:ne:NA ? BEGI fit is inconsistent as hell?

triple88a 11-15-2009 03:48 PM
op sorry didnt see that, nvm then :)


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