2nd Generation Specific 1986-1992 Discussion

31/4 inch dowpipe

Old 12-31-2005, 05:09 PM
  #1  
Senior Member
Thread Starter
 
Join Date: Nov 2005
Location: CHARLOTTE,NC.
Posts: 390
Default

i was told a 31/4 inch dowpipe is too big ? for the stock turbo motor is new street port someone told me to port the wastegate is it tru do i have any problem ? will i blow the motor ?
1979rx7 is offline  
Old 12-31-2005, 05:17 PM
  #2  
Senior Member
 
Join Date: May 2005
Posts: 277
Default

3" downpipe is big enough. Porting wastegate will not blow motor, it should prevent overboost problems that can happen when exhaust backpressure is redused. If you dont want overboost problems and dont want to port wastegate using 2 1/2" for at least a meter should prevent.
Nospig is offline  
Old 12-31-2005, 05:25 PM
  #3  
Senior Member
Thread Starter
 
Join Date: Nov 2005
Location: CHARLOTTE,NC.
Posts: 390
Default

Originally Posted by Nospig' post='791266' date='Dec 31 2005, 07:17 PM

3" downpipe is big enough. Porting wastegate will not blow motor, it should prevent overboost problems that can happen when exhaust backpressure is redused. If you dont want overboost problems and dont want to port wastegate using 2 1/2" for at least a meter should prevent.




how hard is to port the wastegate or how is done ?wil a resonator work ?
1979rx7 is offline  
Old 12-31-2005, 05:55 PM
  #4  
Senior Member
 
Join Date: May 2005
Posts: 277
Default

With s4 and s5, turbo back cover needs to be removed. ( after removing exhaust housing) using a die grinder open waste gate hole as big as possible but flap door still needs to seal when shut or turbo will feel lazy.
Nospig is offline  
Old 12-31-2005, 06:36 PM
  #5  
Senior Member
 
Join Date: May 2002
Location: California
Posts: 22,466
Default

you either want a restrictive exhaust, so that the wastegate can control the boost, or a really free flowing exhaust so the turbo cant make enough boost.
j9fd3s is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Benny
RX-7 & RX-8 Parts For Sale & Wanted
13
05-07-2003 06:43 PM
CrazyAssRX7
RX-7 & RX-8 Parts For Sale & Wanted
0
04-03-2003 11:34 AM
madscientistrx7
RX-7 & RX-8 Parts For Sale & Wanted
4
01-23-2003 10:55 PM
pstonssuk
RX-7 & RX-8 Parts For Sale & Wanted
14
12-20-2002 02:19 PM
ForceFed
RX-7 & RX-8 Parts For Sale & Wanted
11
06-29-2002 07:15 AM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Quick Reply: 31/4 inch dowpipe


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.