Is a flex tube 100% necessary on the DP? - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 11-11-2009, 02:09 PM   #41
Elite Member
Thread Starter
iTrader: (8)
 
Join Date: Aug 2007
Location: Bellingham, Wa
Posts: 2,732
Total Cats: 3
Default

hard-mounting to the transmission is also not a good idea.

wayne_curr is offline   Reply With Quote
Old 11-11-2009, 02:11 PM   #42
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,872
Total Cats: 1,790
Default

Braineack is offline   Reply With Quote
Old 11-11-2009, 02:42 PM   #43
Elite Member
iTrader: (6)
 
Join Date: Nov 2007
Location: Southlake,Texas
Posts: 3,251
Total Cats: 17
Default

Quote:
Originally Posted by Braineack View Post
lol.

Two of my exhaust hangars broke which inevitably lead to my manifold stud failures. Tack welding hangars is FTL.
Bond is offline   Reply With Quote
Old 11-11-2009, 03:43 PM   #44
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by TurboTim View Post
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.

Quote:
Originally Posted by 18psi View Post
Careful not to seize your Motec muffler bearings though
lol
hustler is offline   Reply With Quote
Old 11-11-2009, 06:01 PM   #45
Senior Member
iTrader: (3)
 
Join Date: Jun 2008
Location: Port Orchard, WA
Posts: 620
Total Cats: 4
Default

Quote:
Originally Posted by TurboTim View Post
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?
Rennkafer is offline   Reply With Quote
Old 11-13-2009, 12:36 AM   #46
Senior Member
iTrader: (34)
 
ARTech's Avatar
 
Join Date: Mar 2009
Location: Dallas
Posts: 530
Total Cats: 9
Default

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."
ARTech is offline   Reply With Quote
Old 11-13-2009, 02:10 AM   #47
Senior Member
iTrader: (3)
 
Join Date: Jun 2008
Location: Port Orchard, WA
Posts: 620
Total Cats: 4
Default

Quote:
Originally Posted by ARTech View Post
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.
Rennkafer is offline   Reply With Quote
Old 11-13-2009, 03:43 AM   #48
Elite Member
iTrader: (28)
 
Join Date: May 2008
Location: St. Augustine FL
Posts: 2,310
Total Cats: 2
Default

butt hurt much....^^
p51hellfire is offline   Reply With Quote
Old 11-13-2009, 11:05 AM   #49
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by Rennkafer View Post
If your only answer is useless sarcasm why bother.
Sandy vagina fail.
hustler is offline   Reply With Quote
Old 11-13-2009, 12:20 PM   #50
Senior Member
iTrader: (34)
 
ARTech's Avatar
 
Join Date: Mar 2009
Location: Dallas
Posts: 530
Total Cats: 9
Default

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.
ARTech is offline   Reply With Quote
Old 11-13-2009, 12:27 PM   #51
Elite Member
iTrader: (14)
 
Join Date: Mar 2006
Location: Edmonton, AB
Posts: 4,921
Total Cats: 0
Default

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.
jayc72 is offline   Reply With Quote
Old 11-14-2009, 12:40 AM   #52
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

honda civic doesn't have a flex...
y8s is offline   Reply With Quote
Old 11-14-2009, 02:42 PM   #53
I'm Miserable!
iTrader: (16)
 
Join Date: Dec 2008
Location: where most people are Utarded
Posts: 1,323
Total Cats: 0
Default

Quote:
Originally Posted by Full_Tilt_Boogie View Post
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 is offline   Reply With Quote
Old 11-14-2009, 02:45 PM   #54
I'm Miserable!
iTrader: (16)
 
Join Date: Dec 2008
Location: where most people are Utarded
Posts: 1,323
Total Cats: 0
Default

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 is offline   Reply With Quote
Old 11-14-2009, 02:47 PM   #55
I'm Miserable!
iTrader: (16)
 
Join Date: Dec 2008
Location: where most people are Utarded
Posts: 1,323
Total Cats: 0
Default

Quote:
Originally Posted by Bond View Post
lol.

Two of my exhaust hangars broke which inevitably lead to my manifold stud failures. Tack welding hangars is FTL.
Common sense....
zoomin is offline   Reply With Quote
Old 11-14-2009, 03:08 PM   #56
Senior Member
iTrader: (34)
 
ARTech's Avatar
 
Join Date: Mar 2009
Location: Dallas
Posts: 530
Total Cats: 9
Default

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.
ARTech is offline   Reply With Quote
Old 11-14-2009, 03:45 PM   #57
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

Quote:
Originally Posted by y8s View Post
honda civic doesn't have a flex...
Quote:
Originally Posted by ARTech View Post
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.
y8s is offline   Reply With Quote
Old 11-14-2009, 03:51 PM   #58
Elite Member
iTrader: (2)
 
triple88a's Avatar
 
Join Date: Apr 2006
Location: Chicago, IL
Posts: 9,131
Total Cats: 598
Default

Quote:
Originally Posted by jayc72 View Post
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.
triple88a is offline   Reply With Quote
Old 11-15-2009, 02:31 PM   #59
Elite Member
iTrader: (14)
 
Join Date: Mar 2006
Location: Edmonton, AB
Posts: 4,921
Total Cats: 0
Default

Quote:
Originally Posted by triple88a View Post
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.
NBNA ? BEGI fit is inconsistent as hell?
jayc72 is offline   Reply With Quote
Old 11-15-2009, 04:48 PM   #60
Elite Member
iTrader: (2)
 
triple88a's Avatar
 
Join Date: Apr 2006
Location: Chicago, IL
Posts: 9,131
Total Cats: 598
Default

op sorry didnt see that, nvm then
triple88a is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Garrett Turbo, 1.8 Oil Pan, & Misc. Stuff nbdooey Miata parts for sale/trade 9 08-30-2017 10:50 PM
Re-Spring Tein FLEX or replace? Mazdaspeeder Suspension, Brakes, Drivetrain 21 10-03-2015 07:45 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
"Chimney Ethanol" E100 MiataGarage Engine Performance 5 09-30-2015 12:04 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 08:55 PM.