What setup can yield greater gains? Running header out or having an exhaust such as a Fireball or N1 with testpipe and 2.5 piping all around? I will be using the R strictly for track so sound isn't an issue at all. What do you guys think?

 

If sound is no issue then you don't run in sanctioned events or on tracks that impose sound limits I assume? I'm doing a side exit, no resonator, no muffler setup. Will hopefully get the piping, bends, etc this weekend so sat or sun I'll weld the system together and then dyno it on the 12th.

 

Correct!, Are you trying to achieve some type of gain by putting some length of piping after the header? I mean is there any difference between what your doing and what im thinking of doing aside from looks.

 

Here's my setup on my R ... it's also a dedicated track car. If you want more info IM me.

 

Yeah, trying not to need earplugs AND a helmet when driving it. lol seriously though, open header is LOUD AS ****. The only thing that makes my setup slightly different is that it's going to be letting out the exhaust on the pass side and behind me instead of 2 feet from me directly underneath the car reverberating (sp?) off the road.. Will extending it make any type of power difference? maybe, dunno if it'd be a good or bad difference, but I doubt it'd be much of a difference since I wont it'll still be straight piping.

 

Adam: That's what I'll be doing for my ITA integra as well. Cept my welds probably wont be THAT nice

 

Yeah ... it has some real clean welds. John at Hytech made it for me

 

Nice.. at least I can still tell myself that my setup will be cheaper then. lol

 

I was under the impression that an open header setup is inferior to adding at least a couple feet of piping after the collector. You need something to help maintain the velocity of exhaust gasses coming from the exhaust manifold. Otherwise, you could just run an open head! Usually, a few feet of pipe after the collector is all you need. Also, most sanctioning bodies require that the exhaust gasses are expelled behind the driver, if I'm not mistaken.

Nice setups, guys!

 

I agree 231,

I too have read for a long time now that running just the open header without at least some piping that is tuned to maintain exhaust velocity and reduce unwanted backpressure will actually detract from the cars performance, especially with a 1.8 liter engine that has far less exhaust velocity than say a C5 Corvette.

If sound, and law really was NOT the issue then, would we all run around with open headers?

H'mmm. also it was posted that the side exit piping was going to be dynoed, so is that to tune the exhaust pipe and do away with these negative issues?

How much HP are gained by running an open header?

Very Interesting,

A.

 

But isnt it true that at higher rpm's, the shorter the length of the piping the more power you would be getting? The exhaust gas would not need to travel through a lnegth of piping, rather it would be able to exit the engine and reach the atmosphere much quicker.

 

Makes sense, but I've never tested it so I can't comment beyond "I'm not sure.." But.. I did make sure that he wasn't running a sanctioned series, he's not.. I am with the ITA car (obviously) so mine will be like adams, bullet muffler

 

Well, you need to be able to pull as much exhaust gas out of the motor as possible. If you went open head, your car would run like complete ***. Open header might not be that much better.. not sure though, so I'll degress until I or someone else tests it.

 

Yes, that was supposed to be my point. I can't tell if it comes accross in my original wording or not. Perhaps "runs like ***" was more clear

The goal is not to get the exhaust gasses into the atmosphere ASAP. The goal is to get all of the burnt gasses out of the cylinder at each exhaust stroke. I still believe that most exhaust manifolds would benefit from having at least a couple of feet after the collector to maintain gas velocity, unless the header was built to run open (see the DC race header as an example...it's supposed to run open, and it's a couple feet longer after the collector, not that DC is any kind of reference point, LOL!).

 

I can't be completely sure as to how much different your engine would respond then mine....but what worked best for me was removing Adams extension section and bolting the muffler right to the end of the header. best performance for me was........

1. open header(with a specific pimary and secondary length
2. same as above with muffler on end of header
3. same as 1 with extension with muffler on the end exactly like adams
4. full system.

going from number 3 to 2 i gained roughly 2/10's in the quarter mile
going from number 2 to 1 i gained roughly 1/10+ in the quarter mile

 

Thanks for the info Lip. Too bad you didn't do piping after the header with no muffler.. we'll see how that responds on my car soon.

 

i did actually...and thats how i began to see that the quick exit worked best. i just didn't mention that testing. Some of my events i have to use a muffled vehicle. so what i did was......go with the same system adam uses now. then i removed the muffler when there are no sound ordinances. I then tried it shorter and pulled out the extension and ran open header only. on muffled days i just put the muffler on the end of the header. i came out with the results from above after trying different cam gear settings.