Greddy with external WG? - 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 03-15-2008, 01:17 PM   #1
Elite Member
Thread Starter
iTrader: (10)
 
IcantDo55's Avatar
 
Join Date: Apr 2007
Location: VA Beach
Posts: 1,764
Total Cats: 18
Default Greddy with external WG?

So here the setup.

Setup:

1992 1.6 5spd
150K stock motor
Greddy kit with the only remaining part not upgraded being the turbo
ETD manifold
Tony's 2.5" DP to 3" cat to 2.5" exhaust straight through muffler
Stripes intercooler kit
460cc inj
Braineack MS with EBC boomslang
CLutchnet 3X PP and 4 puck sprung disk
Godspeed rad


Here the question...as we all know the greddy WG needs springs and still has issues on any boost level over about 8psi. Being I have the ETD manifold and there is a ton of room under it what do you think of the idea of welding on a WG to the bottom of the manifold under where the turbo mounts? I think there is plenty of room and hopefully that will let us close the internal WG for ever and regulate boost accurately with the underside WG?

OK, lets hear it......good idea or bad?
IcantDo55 is offline   Reply With Quote
Old 03-15-2008, 04:59 PM   #2
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

uh no that is plane silly.
magnamx-5 is offline   Reply With Quote
Old 03-15-2008, 05:04 PM   #3
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

Expensive, much more epensive than 30 minutes with a die grinder to port the internal WG hole and add a helper spring. It would work great though. Add the external WG and tack weld the WG flap closed. Or drill and tap a hole in the current DP flange and use a bolt through that hole to hold the flap closed.
cjernigan is offline   Reply With Quote
Old 06-03-2008, 03:28 AM   #4
Junior Member
iTrader: (1)
 
Join Date: Mar 2008
Location: Los angeles, San diego
Posts: 89
Total Cats: -22
Default

seen it done on evo stock turbo worked nice but imo not worth the cost
jdmcwestevo is offline   Reply With Quote
Old 06-03-2008, 03:39 AM   #5
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,362
Total Cats: 1,323
Default

May as well sell the ETD, buy a BEGi S5, and build a DP.
Savington is offline   Reply With Quote
Old 06-03-2008, 03:41 AM   #6
Guest
iTrader: (6)
 
Join Date: Sep 2007
Location: Vaughan, On, Canada
Posts: 1,092
Total Cats: 0
Default

You could add the external wastegate as mentioned and have solid boost control. Not really that big of a deal. The greddy is a good turbo with great top end!
M-Tuned is offline   Reply With Quote
Old 06-03-2008, 01:16 PM   #7
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,914
Default

You could also simply replace the wastegate actuator with a more stout unit.
Details at post # 18 of this thread: https://www.miataturbo.net/forum/showthread.php?t=21069
and # 35 in this thread: https://www.miataturbo.net/forum/showthread.php?t=13351

Additionally, I moved my WG reference from the stock location at the outlet of the compressor to a nipple which I screwed into the pipe between the intercooler and the throttle body. Abe suggested that to me, and it worked wonders.

Between these two changes, my boost is quite stable at ~13 PSI all the way to redline. Apart from the fact that I'm still using an MBC, my setup is basically identical to yours- unported TD04H-15G, no helper spring, Tony 2.5" DP, 2.5" cat, 2.5" straight-through exhaust.
Joe Perez is offline   Reply With Quote
Old 06-03-2008, 02:18 PM   #8
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

The EBC with the helper spring (or improved actuator) would give you everything you want. It did exactly that for my t3.
m2cupcar is offline   Reply With Quote
Old 06-03-2008, 11:06 PM   #9
Senior Member
iTrader: (6)
 
nester's Avatar
 
Join Date: Sep 2005
Location: Houston, TX
Posts: 812
Total Cats: 0
Default

bottom mounted wg sucks for maintenance.
nester is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Miata new person and a what's it worth! Model192 Meet and Greet 16 09-29-2015 09:50 PM
WTB T25/T28 flanged turbo ASAP JesseTheNoob WTB 4 09-11-2015 02:25 PM


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 03:37 AM.