Straight out downpipe, no exhaust? (In theory) - Page 2 - 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 04-09-2008, 10:34 PM   #21
Elite Member
iTrader: (5)
 
Atlanta93LE's Avatar
 
Join Date: Sep 2006
Location: Marietta, GA
Posts: 2,198
Total Cats: 1
Default

First time I started my car with the turbo bolted on was 3" open DP...in a small, one-car garage. DAMN. Loud. Tried driving to Ben's with the wastegate wired open, but got pulled over and sent home right as I pulled onto the main street.

I would never wish that upon anyone.
Atlanta93LE is offline   Reply With Quote
Old 04-09-2008, 10:42 PM   #22
Elite Member
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default

elesjuan is offline   Reply With Quote
Old 04-09-2008, 11:07 PM   #23
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

My old turbo setup was more quiet with open downpipe than my roommates 91 with a old cat and a straight through resonator.
cjernigan is offline   Reply With Quote
Old 04-10-2008, 01:45 AM   #24
I'm Miserable!
 
Join Date: Dec 2007
Posts: 46
Total Cats: 0
Default

I've used a 3.5" DMH cutout and spoolup was improved compared to the 2.5" muffler (small impact on boost threshold, yet notable difference in transient response), but I would recommend giving the cutout priority flow. The QTP merger is a piece of ****.
opek is offline   Reply With Quote
Old 04-10-2008, 02:52 AM   #25
Supporting Vendor
Thread Starter
iTrader: (3)
 
Join Date: Jul 2006
Location: San Diego
Posts: 2,863
Total Cats: 485
Default

Maybe I'll unbolt the exhaust and fab a turn-down tip onto a flange to put on the end of the downpipe for race days... More work than I want though... Kinda rather do the cut-out switch.
Seriously, I need to find a guy in CA who can do a custom DP...
ThePass is offline   Reply With Quote
Old 04-10-2008, 03:04 AM   #26
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

If you buy into the enthuza exhaust GB. Call him up and talk to him. I bet if you tell him you want a test pipe for you car, with a built in manual cutout, that he could do it easily for you. He would have to cut two angles and weld one extra flange on the end of the cutout but you could get him to tack weld studs in that flange so you use wing nuts to hold the plate on when not in use.
cjernigan is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 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
1996 Turbo Build Goldwar DIY Turbo Discussion 2 09-29-2015 10:20 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 01:33 AM.