Notices
DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Cutting the shelf behind downpipe

Old Jun 7, 2010 | 01:14 PM
  #21  
falcon's Avatar
Thread Starter
Elite Member
iTrader: (13)
 
Joined: Dec 2009
Posts: 2,499
Total Cats: 16
Default

Originally Posted by wayne_curr
I really think you should go with a bottom mount setup. You're still going to have a hard time getting a 3" downpipe in there with that removed.

I can seam weld it if you need me to. I could probably tote my welder up there without too much issue except I dont know how they feel about bringing pressurized gasses across the border.
No reason to sell what I already have. Even if I keep the current DP, I'll be happy. I just want to be able to put the downpipe on after the turbine housing gets bolted on.

Are you up for making me an exhaust though? From my "cat" back... I want to re-locate the magnaflow I have on the back to right after the downpipe and run a left exit "straight pipe".
Old Jun 7, 2010 | 01:22 PM
  #22  
wayne_curr's Avatar
Elite Member
iTrader: (8)
 
Joined: Aug 2007
Posts: 2,712
Total Cats: 5
From: Bellingham, Wa
Default

Always down to do exhaust work. This left-exit exhaust trend is really interesting.
Old Jun 7, 2010 | 01:28 PM
  #23  
falcon's Avatar
Thread Starter
Elite Member
iTrader: (13)
 
Joined: Dec 2009
Posts: 2,499
Total Cats: 16
Default

I'm cutting my bumper, and want to get rid of as much weight as possible. And the exhaust I have droops too low and always scrapes (and I'm not even that low!). There is ample room to re-do the exhaust a good 2-3 inches higher. And it will involve very few bends = more flow.
Old Jun 7, 2010 | 01:54 PM
  #24  
m2cupcar's Avatar
Elite Member
iTrader: (5)
 
Joined: Jan 2005
Posts: 7,486
Total Cats: 372
From: Atlanta
Default

I did it for a smooth top-mount 3" dp. But wouldn't do it w/o welding some plate in.
Old Jun 7, 2010 | 02:05 PM
  #25  
chpmnsws6's Avatar
Elite Member
iTrader: (12)
 
Joined: Apr 2008
Posts: 2,712
Total Cats: 25
From: Springfield IL
Default

Originally Posted by rugger
Don't cut into it anymore than you have. There is structure behind there, and you don't want to mess with it. However, the "ears" against the firewall can be cut out entirely. Every v8 miata has them cut out. Picture of mine before paint:


edit: There are some subframe mods that can be done as well that will give you crazy room. Let me know if you want to consider that.
You left a lot of meat on that! Mine is cut flush with the "frame rail" on both sides. We added in 1/8th inch steel plates to both sides for some added bracing, and was going to triangulate the corners some, but ended up getting lazy
Old Jun 7, 2010 | 02:24 PM
  #26  
wayne_curr's Avatar
Elite Member
iTrader: (8)
 
Joined: Aug 2007
Posts: 2,712
Total Cats: 5
From: Bellingham, Wa
Default

Originally Posted by falcon
I'm cutting my bumper, and want to get rid of as much weight as possible. And the exhaust I have droops too low and always scrapes (and I'm not even that low!). There is ample room to re-do the exhaust a good 2-3 inches higher. And it will involve very few bends = more flow.
Remember me telling you I was afraid of that? I can redo the hangers on that so that it will never scrape (depending on how low you are) or bang around when you go around corners at the track.
Old Jun 7, 2010 | 04:02 PM
  #27  
rugger's Avatar
Junior Member
 
Joined: Apr 2009
Posts: 48
Total Cats: 0
From: Conifer, CO
Default

Originally Posted by chpmnsws6
You left a lot of meat on that! Mine is cut flush with the "frame rail" on both sides. We added in 1/8th inch steel plates to both sides for some added bracing, and was going to triangulate the corners some, but ended up getting lazy
I coped my cut around the steering shaft grommet/seal. I didn't feel like "fixing" that if I didn't have to!
Old Jun 7, 2010 | 10:32 PM
  #28  
Sokool's Avatar
Junior Member
iTrader: (1)
 
Joined: Jan 2009
Posts: 290
Total Cats: 5
From: Bradenton, FL
Default

I got 3" to fit just fine with out cutting the shelf.... Who needs mandrel bends? Pie cuts FTW!

Name:  exhaust2.jpg
Views: 779
Size:  66.1 KB

Name:  exhaust5.jpg
Views: 1027
Size:  73.9 KB
Old Jun 7, 2010 | 11:38 PM
  #29  
magnamx-5's Avatar
:(
iTrader: (7)
 
Joined: Jul 2006
Posts: 8,255
Total Cats: 4
From: nowhere
Default

Originally Posted by Sokool
I got 3" to fit just fine with out cutting the shelf.... Who needs mandrel bends? Pie cuts FTW!



mad skill
Old Jun 8, 2010 | 12:12 AM
  #30  
SKMetalworks's Avatar
Elite Member
iTrader: (7)
 
Joined: Jan 2007
Posts: 1,731
Total Cats: 4
From: Renton Washington
Default

Name:  P5020020.jpg
Views: 760
Size:  71.7 KB
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Full_Tilt_Boogie
Build Threads
84
Apr 12, 2021 04:21 PM
StratoBlue1109
Miata parts for sale/trade
21
Sep 30, 2018 01:09 PM
Goldwar
DIY Turbo Discussion
2
Sep 29, 2015 09:20 AM
Greasyman
General Miata Chat
2
Sep 28, 2015 10:44 AM


Thread Tools
Search this Thread

All times are GMT -4. The time now is 10:45 AM.