External Wastegate Dump Tube Question Newb ? - 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 12-10-2007, 12:07 PM   #1
Elite Member
Thread Starter
iTrader: (6)
 
Join Date: Sep 2007
Location: CA
Posts: 1,990
Total Cats: 9
Default External Wastegate Dump Tube Question Newb ?

What part of the dump tube would need to be modified to run an internal wastegate? I thought I'd be able to just section off the dump tube portion of the downpipe and cap off the wastegate hole on the exhaust manifold? FM told me there's more to it than that.

I thought internal wastegates just vented to atmosphere and dump tubes weren't necessary.

Name:  91.jpg
Views: 10
Size:  11.4 KB
kenzo42 is offline   Reply With Quote
Old 12-10-2007, 12:11 PM   #2
Senior Member
iTrader: (14)
 
brgracer's Avatar
 
Join Date: Nov 2004
Location: Ambler, PA
Posts: 1,275
Total Cats: 1
Default

Basically you'd need to connect the external wastegate pipe portion of the DP to the DP turbo flange right next to the main turbo outlet where you'd typically have the internal wastegate and drill out the flange as well. Internal wastegates dump out into the DP either with a bellmouth DP or separated as you see in your pic. If you just drilled out the turbo flange where the internal wastegate is you'd have exhaust emptying right out into the engine bay.
brgracer is offline   Reply With Quote
Old 12-10-2007, 12:14 PM   #3
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

weld the internal wg flapper shut and run the external
that's a DAMN GOOD DEAL for that stuff...
Ben is offline   Reply With Quote
Old 12-10-2007, 12:23 PM   #4
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

Makes me want to buy a 1.6 just to run that. That's awesome.
cjernigan is offline   Reply With Quote
Old 12-10-2007, 01:43 PM   #5
Elite Member
Thread Starter
iTrader: (6)
 
Join Date: Sep 2007
Location: CA
Posts: 1,990
Total Cats: 9
Default

Can you control boost w/ a MBC on an external wastegate? I believe the weakest spring for this Tial is .6 bar (9psi) which is alot higher than I'd like to run.
kenzo42 is offline   Reply With Quote
Old 12-10-2007, 01:46 PM   #6
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Of course you can, but a MBC won't reduce boost under the WG.
Ben is offline   Reply With Quote
Old 12-10-2007, 01:47 PM   #7
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,840
Total Cats: 1,786
Default

Quote:
Originally Posted by kenzo42 View Post
...(9psi) which is alot higher than I'd like to run.

no it's not, run it as is.


if you block the external port, you'd still have to modify the DP itself to run an internal.....it's not worth the trouble, I'd run that as is and be very very very happy. 9psi is nothing.
Braineack is offline   Reply With Quote
Old 12-10-2007, 01:50 PM   #8
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

I have a 7 psi spring in my tial.
cjernigan is offline   Reply With Quote
Old 12-10-2007, 01:55 PM   #9
Senior Member
iTrader: (12)
 
Join Date: Nov 2005
Location: Murfreesboro, TN
Posts: 596
Total Cats: 3
Default

You can get springs as low as around 3.5 psi for the Tial WG FWIW.
sbrian2 is offline   Reply With Quote
Old 12-10-2007, 01:55 PM   #10
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

Yeah, pretty sure Y8s is running a 3.5 or close to it.
cjernigan is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Another Cast Manifold Corky Bell Prefabbed Turbo Kits 18 11-22-2016 10:01 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 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 02:20 PM.