sizing intercooler piping q's - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to   Members

DIY Turbo Discussion greddy on a 1.8? homebrew kit?

LinkBack Thread Tools
Old 04-06-2012, 07:04 PM   #1
Junior Member
Thread Starter
Join Date: Apr 2011
Location: Oregon
Posts: 278
Total Cats: 7
Default sizing intercooler piping q's

I am in the process of upgrading the turbo on an 04 msm, from the ihi to a little larger garrett 2860. I have a larger intercooler but have used the OEM piping.

The OEM intercooler piping is 2 1/8". Is this too restrictive? What sizes would be optimal for a boost level of 10-12#?
gtred is offline   Reply With Quote
Old 04-06-2012, 07:09 PM   #2
Cpt. Slow
iTrader: (25)
curly's Avatar
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,107
Total Cats: 518

curly is offline   Reply With Quote
Old 04-08-2012, 10:21 PM   #3
Former Vendor
Join Date: Dec 2007
Location: Texas Hill Country
Posts: 271
Total Cats: 16

Curly may think he is right. I think he's right also.

Corky Bell is offline   Reply With Quote
Old 04-08-2012, 11:49 PM   #4
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
y8s's Avatar
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407

I run 2-1/2". well I take that back, it's 2-1/4" in some spots. But to be honest, it doesn't feel sluggish or laggy to run slightly larger piping. you certainly wouldn't notice it on a 60mm compressor.

course the poster above this post may have welded my pipes or at least delegated the work so I'd defer to him.
y8s is offline   Reply With Quote
Old 04-09-2012, 12:27 AM   #5
Elite Member
iTrader: (2)
Mobius's Avatar
Join Date: May 2008
Location: Portland, Oregon
Posts: 3,178
Total Cats: 266

The MSM piping is 2". That will be plenty for 10-12". If you move away from stock piping, the MSM has that elbow connecting to the throttle body that you'll have to replace as well. It has a bung for the second IAT sensor on it. Honestly if you're going to make the piping bigger, I'd use either the Begi or the FM intercooler->throttlebody solutions for the MSM.

Easiest thing to do is plumb the new intercooler into the existing piping and not worry about it. Definitely the most cost-effective route.

My plumbing is 2" compressor to intercooler, then 2.5" to the throttle body.
Mobius is offline   Reply With Quote
Old 04-09-2012, 01:14 AM   #6
Elite Member
iTrader: (13)
Join Date: Dec 2009
Location: Fraser Valley, British Columbia
Posts: 2,502
Total Cats: 13

I run 2.5 all around with my Rotrex. I use to run 2'' hotside and 2.5'' coldside with my ole 10psi GReddy set up. I'm going to go to a new bigger IC with 3'' in/out and keep my 2.5'' hotside and go to a 3'' coldside pipe when I up the boost.
falcon is offline   Reply With Quote
Old 04-09-2012, 01:45 AM   #7
Senior Member
iTrader: (4)
mr_hyde's Avatar
Join Date: Jul 2009
Location: Seattle
Posts: 799
Total Cats: 25

The stock MSM throttle body elbow is crappy rubber that will balloon at best and split at worst so make sure it is replaced with the BEGI or FM part no matter what you run before it.
mr_hyde is offline   Reply With Quote
Old 04-09-2012, 01:48 AM   #8
Elite Member
iTrader: (10)
soviet's Avatar
Join Date: Jan 2010
Location: VA
Posts: 3,517
Total Cats: 257

I'm willing to bet that 2" hot side and 2.5" coldside is the most common

stock throttle body is 2.5"
a lot of turbo outlets are 2"
soviet is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 58 Yesterday 10:04 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
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 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 09:41 AM.