Cut "shelf" thread
#1
Senior Member
Thread Starter
iTrader: (1)
Join Date: Apr 2011
Location: Columbia, SC
Posts: 1,332
Total Cats: 87
Cut "shelf" thread
So, I have come to a crossroads in my turbo build. Cut the "shelf" to make a downpipe fit on my manifold, or sell my manifold and buy a new (likely log) one. I'm curious who all has cut theirs, and how much. Looking at the previous threads that pop up, it seems like most people either cut the sheet metal only to the bulkhead, or remove everything all the way back to the firewall. "Every v8 miata has them cut out"
In order for mine to fit, it is going to take at least the 1/2" sheet metal area, and only if I switch to a smaller diameter dp or to a SGDP. If I go with the 3" downpipe as planned, a fair bit would have to be removed.
What i'm looking for is people who I have actually removed it to say:
Amount removed: "Cut that bitch entirely out" or "Cut back 1" into the bulkhead"
Any reinforcements done: Gusset plates, etc.
Any opinions on why this shouldn't be done, or why it is acceptable are also welcome.
EDIT: Bonus props for pictures.
Picture of my personal situation. Even removing the v-band and welding straight to the 3" reducer, not much room. Welding a SGDP to a segregated flange still won't really leave much room.
In order for mine to fit, it is going to take at least the 1/2" sheet metal area, and only if I switch to a smaller diameter dp or to a SGDP. If I go with the 3" downpipe as planned, a fair bit would have to be removed.
What i'm looking for is people who I have actually removed it to say:
Amount removed: "Cut that bitch entirely out" or "Cut back 1" into the bulkhead"
Any reinforcements done: Gusset plates, etc.
Any opinions on why this shouldn't be done, or why it is acceptable are also welcome.
EDIT: Bonus props for pictures.
Picture of my personal situation. Even removing the v-band and welding straight to the 3" reducer, not much room. Welding a SGDP to a segregated flange still won't really leave much room.
#3
Elite Member
iTrader: (3)
Join Date: Apr 2014
Location: Huntington, Indiana
Posts: 2,885
Total Cats: 616
Here you be:
Got the ledge under the brake booster sectioned (plasma cutter win- again) and welded up with some L shaped plate - now have a place to run the down pipe.
Also got -10AN fittings brazed to the stock heater core tubes. Welded steel tubes (salvage from an old bike frame) to the steel AN fittings and then swaged the brass heater tubes for a slip fit. Then went to work with some silver solder and heat- just like sweating copper pipes. I'll weld some tabs on the fittings so they anchor to the firewall for support.
Also got -10AN fittings brazed to the stock heater core tubes. Welded steel tubes (salvage from an old bike frame) to the steel AN fittings and then swaged the brass heater tubes for a slip fit. Then went to work with some silver solder and heat- just like sweating copper pipes. I'll weld some tabs on the fittings so they anchor to the firewall for support.
#5
a nissan downpipe elbow usually works with that style of manifold
5 Bolt Elbow Down Pipe T25 Turbo Downpipe for Nissan s13 s14 S15 240sx | eBay
or you could fabricate a downpipe that has a bend at flange
5 Bolt Elbow Down Pipe T25 Turbo Downpipe for Nissan s13 s14 S15 240sx | eBay
or you could fabricate a downpipe that has a bend at flange
#6
mkturbo.com
iTrader: (24)
Join Date: May 2006
Location: Charleston SC
Posts: 15,193
Total Cats: 1,685
I am the one working on building Schuyler's down pipe. The way that MP2Cupcar has his shelf cut would make the down pipe easy to make. I just don't have an NB at the moment that I can hack up to build it on.
I actually tried the stock down pipe piece with the manifold on my NA and it seemed to fit. I will try to put it on an NB in the next day or so to see if it fits in there also, and may just go that route.
a nissan downpipe elbow usually works with that style of manifold
5 Bolt Elbow Down Pipe T25 Turbo Downpipe for Nissan s13 s14 S15 240sx | eBay
or you could fabricate a downpipe that has a bend at flange
5 Bolt Elbow Down Pipe T25 Turbo Downpipe for Nissan s13 s14 S15 240sx | eBay
or you could fabricate a downpipe that has a bend at flange
Thread
Thread Starter
Forum
Replies
Last Post
stoves
Suspension, Brakes, Drivetrain
5
04-21-2016 03:00 PM
Greasyman
General Miata Chat
2
09-28-2015 10:44 AM