Exhaust Question
#1
Registered!!
Thread Starter
Join Date: Feb 2010
Location: Peoria, IL
Posts: 26
Likes: 0
Received 0 Likes
on
0 Posts
Rep Power: 0 Exhaust Question
hey, i have a 01 ex. and im planning on putting a DC sports stainless steel header and a apexi world sport 2 catback exhaust. should i put a highflo cat also? and was wondering what kind of hp gain do you think ill be getting? thanks
#2
Registered!!
Join Date: Apr 2008
Location: Calgary, Alberta
Age: 40
Posts: 954
Likes: 0
Received 1 Like
on
1 Post
Rep Power: 206 Re: Exhaust Question
from your dc header and the apexi catback, youre looking at a gain of maybe 3 hp or so. if you want any extra gains you should replace your downpipe as well (i would suggest the random-tech downpipe with high-flow cat). without replacing your downipe (with cat on it), you are somewhat 'choking' the system.
imagine your header flowing smooth, stock downpipe restricting airflow, and catback flowing smooth, youd get a sort of system like in traffic. 3 lanes of traffic being forced into 2 lanes, then allowed to open up again into 3 lanes.
even by adding the high flow res/downpipe, it will still only get you an extra maybe 1.5-2hp though.
imagine your header flowing smooth, stock downpipe restricting airflow, and catback flowing smooth, youd get a sort of system like in traffic. 3 lanes of traffic being forced into 2 lanes, then allowed to open up again into 3 lanes.
even by adding the high flow res/downpipe, it will still only get you an extra maybe 1.5-2hp though.
#3
Registered!!
Join Date: Jan 2009
Location: Fort Edward/South Glens Falls
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
Rep Power: 0 Re: Exhaust Question
i wouldnt say it would only give 3hp. i dynod mine on a chassis dyno w. a i/h/e and stock replacement cat and i put 115whp and 104tq.
#4
Registered!!
Thread Starter
Join Date: Feb 2010
Location: Peoria, IL
Posts: 26
Likes: 0
Received 0 Likes
on
0 Posts
Rep Power: 0 Re: Exhaust Question
ok thanks thats all i was wonderin for now. i also plan on putting a cai to help open things up. something to help with low range power.
#7
Registered!!
Join Date: Jan 2009
Location: Fort Edward/South Glens Falls
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
Rep Power: 0
#8
Premium Member
Hey! Look At Me!! I'm a Supporting Member!!
iTrader: (14)
Join Date: Aug 2006
Location: Portland, Oregon
Age: 39
Posts: 8,362
Likes: 0
Received 1 Like
on
1 Post
Rep Power: 364 Re: Exhaust Question
At the wheels, a stock civic only has between 90-95hp... Dealers rate them at the crank because they get a higher number. On my LX with aem v2, stock EX header and stock EX downpipe, and a DC TCS exahust I made 107 (numbers in sig). Thats 12-17 hp increase with the STOCK cat and STOCK downpipe. I really dont think you'll make more power with a high flow cat. Dyno before and after you replace it to see if its worth keeping.
#9
Low and slow!
Join Date: Jan 2010
Location: Marion, NC
Posts: 1,628
Likes: 0
Received 1 Like
on
1 Post
Rep Power: 190 Re: Exhaust Question
The cat does not really restrict anything at all so you do not have to worry bout that. And the the 127 hp is to the crank not the wheels. The power to the wheels is all you need to worry about. Take the power to your wheels and times that by 15% drivetrain power loss and minus that from the original hp. And that is a rough estimate. It all depends on how good you treat your car and what octane you use to.
#11
Registered!!
Join Date: Jan 2009
Location: Fort Edward/South Glens Falls
Posts: 50
Likes: 0
Received 0 Likes
on
0 Posts
Rep Power: 0 Re: Exhaust Question
im now runnin a custom high flow cat. it feel like it has more torque but i havent had the chance to go back to dyno it again. hoping to go back sumtime in the summer.
Thread
Thread Starter
Honda Civic Forum
Replies
Last Post
hayden55
Archive - Wanted Parts (WTB's)
0
07-08-2015 11:38 PM
fvckbg
Mechanical Problems/Vehicle Issues and Fix-it Forum
4
07-07-2015 07:08 PM