I think we shoud discuss the advantages of diffrent size exhaust (60-70mm) and dual vs. single. Loss of efficianecy, drone issues, actual gains; wether is be in the low to mid range or top end, and experiance with your current or past exhaust. Keep is S2k. & some pics would be cool.

as for me, im currently running the Apexi WSII, I like it, looks nice, probably no power gains in the top-end but feels quicker in the mid range, but that might be because of the test pipe. It has a great tone expecially in the Low rpm's. I believe the piping is 63mm, regardless I didnt want to go too big since I hear you actually loose power in the mid to high where I believe we need it most and gain only at peak. I like the look of dual mufflers but understand a single is more efficient.




Modified by CrankDatVtec at 4:07 PM 1/4/2008

 

70mm singles perform the best.

/thread

 

You loose power in the low & mid range where we need it most, not too much any ways, but our cars are sluggish in the low RPM's as it is. I belive it has to do with less back pressure, I may be wrong?


Modified by CrankDatVtec at 12:54 PM 1/4/2008

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CrankDatVtec &raquo;</TD></TR><TR><TD CLASS="quote">You loose power in the low & mid range where we need it most, not too much any ways, but our cars are sluggish in the low RPM's as it is. I belive it has to do with less back pressure, I may be wrong?
</TD></TR></TABLE>

A bit wrong. A 70mm has been proven numerous times to be the best for an NA s2000 all across the board.

If there is by any chance of a slight loss in the low RPM's it's irrelevant due to the extra gain in the mid and top end. When are you ever driving at under 3k rpms when you really need that extra power?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by papa5murf &raquo;</TD></TR><TR><TD CLASS="quote">
When are you ever driving at under 3k rpms when you really need that extra power? </TD></TR></TABLE>

When I'm trying to race outta my garage!! duh!!!

LOL j/k


I assume this is referring to a 70mm single exit exhaust?

 

I &lt;3 my 70mm single

 

What actually causes the drone in our cars? I would guess its the interference of the sound waves but why so bad around 3k-4k rpms??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by papa5murf &raquo;</TD></TR><TR><TD CLASS="quote">

A bit wrong. A 70mm has been proven numerous times to be the best for an NA s2000 all across the board.

If there is by any chance of a slight loss in the low RPM's it's irrelevant due to the extra gain in the mid and top end. When are you ever driving at under 3k rpms when you really need that extra power? </TD></TR></TABLE>

Ive seen dynos, where people have lost power even into the mid RPM's, but regardless I guess your right? when drag racing low RPM's are not needed.

I just rather gain in the Low-to-mid RPM range where the S2000 needs it most, but I guess its where ever you need the power on your car.

Personally I prefer a single 63mm exhaust, TP && headers which give you gains thru out the power band with no loss. But to each there own.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CrankDatVtec &raquo;</TD></TR><TR><TD CLASS="quote">

Ive seen dynos, where people have lost power even into the mid RPM's, but regardless I guess your right? when drag racing low RPM's are not needed.</TD></TR></TABLE>

When road racing or autocrossing, low RPM's are not needed. If you ever drop out of vtec on a road course or on an autocross course, then you're not driving properly.

The only time when 0(800)-3000 rpms is needed on this car is in stop and go traffic.

 

Id say you need everything between 6000 - 8700 or 9000 depending on application..lol..but seriously im not saying the 70mm dosent make power, its really great! but not for my style, the smaller piping gives you more power in the low-to-mid, and the power begins to drop as it gets into higher RPM's (at about 7600 - 8700+)

Im just saying there's no loss with a mid sized pipe, and you get power thru out the power band? as compared to only on top.

 

i need helpt finding headers, i have 70mm invidia test pipe and 70mm invidia dual catback, i want headers that join to a 70mm pipe, anyone familiar with this? does invidia offer headers like this? thanks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MADBADGER &raquo;</TD></TR><TR><TD CLASS="quote">i need helpt finding headers, i have 70mm invidia test pipe and 70mm invidia dual catback, i want headers that join to a 70mm pipe, anyone familiar with this? does invidia offer headers like this? thanks</TD></TR></TABLE>

J's racing. The collector is 70mm. I believe Berk has one that has a 70mm collector now also. Not 100% on this one though.

 

I have 70MM now and soon to be 3 inch

 

I have the 70RS on my turbo AP1 and i love it. I'm not sure how much more i'd beneift with a 3" catback, since half the exhaust is 3" from the turbo to the J's exhaust.

J's FTW!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by papa5murf &raquo;</TD></TR><TR><TD CLASS="quote">

A bit wrong. A 70mm has been proven numerous times to be the best for an NA s2000 all across the board.

If there is by any chance of a slight loss in the low RPM's it's irrelevant due to the extra gain in the mid and top end. When are you ever driving at under 3k rpms when you really need that extra power? </TD></TR></TABLE>

i've read many times that for NA S2000 70mm single is best.
but i've never read post about single vs. dual as in actual theory and why honda choose dual over single? wouldn't dual also cost more to produce it?

i have basic idea why single makes more power but i'd like to know more in detail and why manufactures choose dual over single.
thanks

 

i would say if the the tubing parted near the engine it would be pointless and you'd loose power, but being that its all the way at the rear it makes no diffrence, have you noticed our right exhaust lets out way more pressure then our left.

 

na or boost, a 70mm will give you the best performance.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bng &raquo;</TD></TR><TR><TD CLASS="quote">na or boost, a 70mm will give you the best performance. </TD></TR></TABLE>

wtf u talkin about.....2.755 is small for a turbo app.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xc1097 &raquo;</TD></TR><TR><TD CLASS="quote">

i've read many times that for NA S2000 70mm single is best.
but i've never read post about single vs. dual as in actual theory and why honda choose dual over single? wouldn't dual also cost more to produce it?

i have basic idea why single makes more power but i'd like to know more in detail and why manufactures choose dual over single.
thanks</TD></TR></TABLE>
i think they chose dual for a marketing purpose. it appeals more to people who buy it. but it's not a true dual, just a look alike. so its basically all for looks.<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HokieS2K &raquo;</TD></TR><TR><TD CLASS="quote">What actually causes the drone in our cars? I would guess its the interference of the sound waves but why so bad around 3k-4k rpms??</TD></TR></TABLE>
i think it has something to do with the straight-through design and the bend of the pipes, but as to the scientific theory idn. id like to know also

 

70mm is the best I don't know y u keep saying u loose power at 7800 and up. I personaly have a 63mm cause I love buddy club Spec III. Well atleast I think its a 63mm if any1 knows 100% plz chime in. Another reason why honda chose dual over single is cause duals are quieter than single and motor screams.

 

I have seen people's scanned dyno charts and at least from those it seems the 70mm singles do indeed boost power everywhere you'd want it for any kind of racing or *ahem* spirited driving

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MADBADGER &raquo;</TD></TR><TR><TD CLASS="quote">i need helpt finding headers, i have 70mm invidia test pipe and 70mm invidia dual catback, i want headers that join to a 70mm pipe, anyone familiar with this? does invidia offer headers like this? thanks</TD></TR></TABLE>

y do u need more than one? i think one will do you just fine...

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CrankDatVtec &raquo;</TD></TR><TR><TD CLASS="quote">I think we shoud discuss the advantages of diffrent size exhaust (60-70mm) and dual vs. single. Loss of efficianecy, drone issues, actual gains; wether is be in the low to mid range or top end, and experiance with your current or past exhaust. Keep is S2k. & some pics would be cool.

as for me, im currently running the Apexi WSII, I like it, looks nice, probably no power gains in the top-end but feels quicker in the mid range, but that might be because of the test pipe. It has a great tone expecially in the Low rpm's. I believe the piping is 63mm, regardless I didnt want to go too big since I hear you actually loose power in the mid to high where I believe we need it most and gain only at peak. I like the look of dual mufflers but understand a single is more efficient.



</TD></TR></TABLE>

I personally love the World Sport... could you please post up more pics... different angles? thanks buddy

 

maybe a 70mm alone has its advantages.

but paired with headers and a test pipe, has a disadvantage in my view. Exhaust is pushed out thru the pressue the engine creates. Having larger piping will diminish this pressure, especially at low & mid revolutions.

imagine squirting water @ a pre-determind pressure thru a 2 inch pipe and then again thru a 3 inch pipe, out of which do you think it'll come out faster?, then again the 3 may be able to exit more water, but not at the same velocity, even as you increase water the smaller piping will always have more pressure (eventualy a larger pipe would become more adequate..ex. F.I.) The goal is to have good pressure and good flow, thats why a 2.5 inch piping in this case would seem more adequate.

But exhaust isnt water, and we must also consider that if the pressure is diminished the engine cannot clear the piping and gases will be sucked back into the engine, this co2 rich air will diminish performance. and at low RPM's cause inparshall detonation & valve burning.

now at WOT at high-mids to high RPM's this obviously dosent matter because the engine is supplying enough pressure for the gasses to completly escape. but you must consider the low to mid rpm's that you use more often.

I may be wrong. Thats just how I see it.


&& sure i'll have more pics of my exhaust later this afternoon.

 

DRONING! i swear i never heard of such a thing till i got a S2K and still this is the only group of guys/gals that ask about it. personally if you are putting a exhasut on droning should be the least of your worries.

but again for power SINGLE 70mm OWNZ for nice street/look dual OWNZ

 

the dual design was for the masses. ie: bitches. If you notice on the Ap1s you have an option of getting a filler replacement to make it single. Notice on AP2s...welll sadly you cant...forever bitch by design. Yea i went there hahaha.