Open Header vs. Bolted on Exhaust comparison - K20A.org .:. The K Series Source . Honda / Acura K20a k24a Engine Forum
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Old 10-22-2009, 02:59 PM   #1
Ejohnson88
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Default Open Header vs. Bolted on Exhaust comparison

Alright before you blow off my head with rants about how I should use the search function... I have been searching all afternoon for this topic... and the ONE THREAD I found that talked about this specific topic did not have the dyno chart anymore and the posts within didn't really answer my questions. SO with that said on to my question....


I want to know if anyone out there has some information about a comparison test between some of the Nice K series swap headers out there running 2.5" but preferably 3" exhaust and testing it against an Open header run, and what the differences were.

There is currently a debate going on where another party is claiming that The difference between an Open header dyno pulll compared to the header being bolted up would be no different and that you really wouldn't see a difference. This is on a completely stock K20 with bolt ons mind you.

So I want to know what some of you NA people think... And if you have some dyno graphs or some other data that proves or disproves this That would be great!

FEEL FREE TO RESPOND THANKS!
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Old 10-22-2009, 03:23 PM   #2
PacDawg
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Default Re: Open Header vs. Bolted on Exhaust comparison

Don't have the dyno sheet available but I had my car tuned for open header a while ago and as an after thought wanted to see how much, if any, power would be lost after bolting up my 3" exhaust and there was no measurable loss in power. Maybe 1-2 hp loss here and 1-2 hp gain there but pretty much the same power band. FYI, this is for a DC5 chasis with a k24/20 making 254 whp / 193 lbtq.
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Old 10-22-2009, 03:36 PM   #3
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Default Re: Open Header vs. Bolted on Exhaust comparison

Cool anyone else?
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Old 10-22-2009, 07:29 PM   #4
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Default Re: Open Header vs. Bolted on Exhaust comparison

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Originally Posted by Ejohnson88 View Post
Cool anyone else?
it kinda depends on the muffler..on my last build which was not a a k series but a built ls vtec,when on the dyno i had the muffler bolted on and was only making 219 hp on a dynapack dyno....after unbolting it it made 259 hp!!!big jump
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Old 10-23-2009, 06:14 AM   #5
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Default Re: Open Header vs. Bolted on Exhaust comparison

Lol don't want to take anything away from you but I'd personally have to see that for myself before I believe that.
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Old 10-23-2009, 08:22 AM   #6
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Default Re: Open Header vs. Bolted on Exhaust comparison

i had mine tuned with and without, i saw 13hp gain open but i guess it could depend on muffler ur using. even on my b-series i saw a 5hp gain open
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Old 10-23-2009, 08:24 AM   #7
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Default Re: Open Header vs. Bolted on Exhaust comparison

Quote:
Originally Posted by insidiouseg6 View Post
it kinda depends on the muffler..on my last build which was not a a k series but a built ls vtec,when on the dyno i had the muffler bolted on and was only making 219 hp on a dynapack dyno....after unbolting it it made 259 hp!!!big jump
40 hp gain??
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Old 10-23-2009, 08:32 AM   #8
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Default Re: Open Header vs. Bolted on Exhaust comparison

Quote:
Originally Posted by insidiouseg6 View Post
it kinda depends on the muffler..on my last build which was not a a k series but a built ls vtec,when on the dyno i had the muffler bolted on and was only making 219 hp on a dynapack dyno....after unbolting it it made 259 hp!!!big jump
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Old 10-23-2009, 08:38 AM   #9
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Default Re: Open Header vs. Bolted on Exhaust comparison

KD what diameter piping do you have? How many resonators? Chassis? and what kind of muffler? I personally have a World Sport II 3"
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Old 10-23-2009, 08:40 AM   #10
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Default Re: Open Header vs. Bolted on Exhaust comparison

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lmfao
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Old 10-23-2009, 08:40 AM   #11
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Default Re: Open Header vs. Bolted on Exhaust comparison

And how were the gains through out the mid range not just peak?
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Old 10-23-2009, 08:43 AM   #12
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Default Re: Open Header vs. Bolted on Exhaust comparison

Id say the key is the 3+inch exhaust . . .

On a stock H2b car i picked up around 1-1.5 with a little over 2hp in the upper rpms of powerband from removing my 3 inch exhaust. 2hp is negligable. . . Although I was running a vibrant race muffler so I'm sure that had something to do with it.

I wouldnt put anything less than 3inch on a K
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Old 10-23-2009, 08:49 AM   #13
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Default Re: Open Header vs. Bolted on Exhaust comparison

Thanks for the info AMC. I am running 3" custom mandrel with a WSII muffler, not worried about that power... I am just having a debate with someone about how completely different it is running a K open header from running a K with an exhause bolted up, even if it is 3".
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Old 10-23-2009, 08:56 AM   #14
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Default Re: Open Header vs. Bolted on Exhaust comparison

it will always be different. granted not 40whp different, but different. prob 10whp, give or take normally.
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Old 10-23-2009, 09:40 AM   #15
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Default Re: Open Header vs. Bolted on Exhaust comparison

i haven't dyno my car with the apexi ws2 but when i run it open exhaust which was the way i tuned it, it fells like i just swaped engines. cause the ws2 has so much back pressure.
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Old 10-23-2009, 09:46 AM   #16
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Default Re: Open Header vs. Bolted on Exhaust comparison

Talk to Dave a Smsp he can set u up with a great cat ,res, muffler that will not kill ur power.
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Old 10-23-2009, 09:47 AM   #17
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Default Re: Open Header vs. Bolted on Exhaust comparison

on a typical k setup, i.e. i/h/e/cams/kpro, going from 3 inch to open header u'll be lucky to see a max of 3 whp increase, if that lol. In fact i've seen a car that ended up making 314/217 on final tune gain about 1 whp from swithcing to open header from his 3 inch, with the runs having been done back to back.
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Old 10-23-2009, 10:25 AM   #18
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Default Re: Open Header vs. Bolted on Exhaust comparison

I am not personally looking for exhaust setups because I am content with the one I have now... It fits my needs.

What I am interested in is just people's real life experiences and what they have seen with various setups and such. SO continue to post up the info its appreciated!

Also Peak numbers is not really my main concern I want to know ab out gains/losses through out the entire powerband. Thanks again!
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Old 10-23-2009, 10:46 AM   #19
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Default Re: Open Header vs. Bolted on Exhaust comparison

The last two cars we tested this on were:

K24(13.7:1) with a stock 06 tsx head/rcrew header. The car made 247whp with 2.5" exhaust, open header it made the same exact power!

The other car tested on was a H2b EG. Stock block, ported head, pro1's, SMSP Header, 3" Exhaust. The car made 246whp with and without the exhaust on.
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Old 10-23-2009, 11:10 AM   #20
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Default Re: Open Header vs. Bolted on Exhaust comparison

You guys are still only talking peak numbers I am interested in the midrange....
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