H2B exhuast 3" torque loss?..
#1
H2B exhuast 3" torque loss?..
So Ive been reading up that H22's are responding well to 3" exhausts all motor... but I was just wondering if anybody with some first hand experience or knowledge on the subject can verify that there is any torque loss... or maybe a bigger torque gain in 2.5 over 3... if this is the case I may consider 2.75 piping... mandrel bent side exit no cat or muffler... I just don't want to sacrifice torque... (Im also a muscle car guy lol... so I like my torque to a degree)
#3
Re: H2B exhuast 3" torque loss?..
you might see a tiny amount of torque loss down low from less backpressure but increasing your exhaust size should always net higher numbers because the engine can breathe better with less force in the exhaust system.
#4
Re: H2B exhuast 3" torque loss?..
Yeah but isn't it quite dependent on the ability to flow the exhaust pressure through the exhaust... you need back pressure for torque in some situations... you put a 3" exhaust on a D or B series motor... most likely going to loss ALOT of low/mid range HP and mayyybe gain a little way up top... and probably look TQ across your entire curve (keep in mind Im not speaking about turbo'd applications or extreme HP applications) I want the ability to flow big numbers up top (as I am probably gonna be revving to 9000) but I want some good mid range punch aswell to get me there, and the torque to keep it moving... some people are telling me 2.75" will yield me more torque and a bit better mid range punch but cost me a few ponies up top... which wouldn't be the worst thing if the hp sacrifice wasn't insane then I would think it would be worthy of a few torque... something harder to come by in Honda's
#5
Honda-Tech Member
Join Date: Jan 2005
Location: Minneapolis MN
Posts: 575
Likes: 0
Received 0 Likes
on
0 Posts
Re: H2B exhuast 3" torque loss?..
Good info in this thread about backpressure misconceptions
https://honda-tech.com/forums/all-motor-naturally-aspirated-44/full-3-exhaust-b20-lost-torque-2971507/
Do the 3".
https://honda-tech.com/forums/all-motor-naturally-aspirated-44/full-3-exhaust-b20-lost-torque-2971507/
Do the 3".
#6
Re: H2B exhuast 3" torque loss?..
That was a good read :-) thanks, yea I'll probably just go with a 3" side exit, probably a Vibrant Performance 3" super quiet resonator coming off Bisimoto headers. we'll see how I fare with that
#7
Re: H2B exhuast 3" torque loss?..
Ugh... I just read a thread which is making me reconsider my Bisimoto header choice... it showed significant mid range loss... however this was on an engine running with like 200whp... I'm looking for nearly 300. faaaaack decisions decisions!!
Trending Topics
#8
All Motor Mentor
Join Date: Aug 2004
Location: 902, Nova Scotia, Canada
Posts: 6,987
Likes: 0
Received 1 Like
on
1 Post
Re: H2B exhuast 3" torque loss?..
So what makes you think that the Bisimoto header will perform any different on a 300hp motor? It was custom built for the 200whp motor and look how it did....
#9
Re: H2B exhuast 3" torque loss?..
Yeah I didn't go through the entire 14 pages of arguing... all I know is it wasn't built for the motor that it was dyno'd on from my understanding... but I'll probably go with a different header now after reading that, that mid range loss was way too much for my likings.
#10
All Motor Mentor
Join Date: Aug 2004
Location: 902, Nova Scotia, Canada
Posts: 6,987
Likes: 0
Received 1 Like
on
1 Post
Re: H2B exhuast 3" torque loss?..
Yeah I didn't go through the entire 14 pages of arguing... all I know is it wasn't built for the motor that it was dyno'd on from my understanding... but I'll probably go with a different header now after reading that, that mid range loss was way too much for my likings.
#12
Honda-Tech Member
Join Date: Mar 2004
Location: Disneyland
Posts: 1,328
Likes: 0
Received 0 Likes
on
0 Posts
Re: H2B exhuast 3" torque loss?..
wait...you're looking for nearly 300whp and you're asking if you should go with a 3" exhaust?
Sounds to me like you won't get near 300whp.
#13
B*a*n*n*e*d
iTrader: (1)
Re: H2B exhuast 3" torque loss?..
I just went with full 3" on my stock B20 (non VTEC) and did notice a very slight loss in bottom end torque, it wasn't much but it was noticeable by the butt dyno. However the car pulls much better all the way through the powerband and pulls all the way to redline now where it used to fall off up top.
Oh, and don't use the word "backpressure" on here... these guys take offense to that word for some reason...
Oh, and don't use the word "backpressure" on here... these guys take offense to that word for some reason...
#14
All Motor Mentor
Join Date: Aug 2004
Location: 902, Nova Scotia, Canada
Posts: 6,987
Likes: 0
Received 1 Like
on
1 Post
Re: H2B exhuast 3" torque loss?..
To me, that is making a subjective statement, not a factual one when it comes to suggesting exhaust sizing to go with. The other arguement would be that even if you did lose some bottom end torque, who's to say that it couldn't be corrected with additional tuning, now that the engine can breathe better?
Going to a 3" exhaust and properly tuning it afterwards, should always give you more power everywhere.
#15
Honda-Tech Member
Join Date: Aug 2006
Location: Nevada
Posts: 603
Likes: 0
Received 0 Likes
on
0 Posts
Re: H2B exhuast 3" torque loss?..
I have a header that would probably out-perform just about any header available to the h2b market. Let me know if your interested I don't want to turn your thread into a FS.
Thread
Thread Starter
Forum
Replies
Last Post
"Ridge"Racer
Honda Civic (2006 - 2015)
12
05-13-2007 06:31 AM