Forums
New posts
Search forums
What's new
New posts
New profile posts
Latest activity
Members
Registered members
Current visitors
New profile posts
Search profile posts
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
RAM TRX - TRX-Forum.com
Bronco Raptor - BroncoRaptorForum.com
Forums
GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Tune plus downpipes, worth it??
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="wjn" data-source="post: 1290956" data-attributes="member: 28348"><p>I double the diameter, and get a ten times bigger surface, no sir. The 4" dia has 12.5 sq-in, 4 times difference, not ten. (Formula is pi * r2.)</p><p></p><p>And as stated above, normally the cell count is in CPSI (cells per square inch). Your example for flow difference is good, but maybe better turn it around: 1500 devided by 4 (difference in surface) equals 375. If the stock cat has 1500 cpsi and 8" diameter, it will flow (approx.) like a 375 cpsi with 4" diameter. In this case a 200 cpsi with 4" diameter will have a better "flow".</p></blockquote><p></p>
[QUOTE="wjn, post: 1290956, member: 28348"] I double the diameter, and get a ten times bigger surface, no sir. The 4" dia has 12.5 sq-in, 4 times difference, not ten. (Formula is pi * r2.) And as stated above, normally the cell count is in CPSI (cells per square inch). Your example for flow difference is good, but maybe better turn it around: 1500 devided by 4 (difference in surface) equals 375. If the stock cat has 1500 cpsi and 8" diameter, it will flow (approx.) like a 375 cpsi with 4" diameter. In this case a 200 cpsi with 4" diameter will have a better "flow". [/QUOTE]
Insert quotes…
Verification
Post reply
Members online
Dameatz
shank_guru
dvm
freddyttt
JFKwasAFK
Sergio212
SuprSeb
jake85
Rucku5
Forum statistics
Threads
93,202
Posts
1,955,938
Members
56,485
Latest member
bjorn-dpc
Forums
GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
Tune plus downpipes, worth it??
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top