HKS Hi-Power Exhaust Question
Originally Posted by aHero4Eternity
so then you bought hks because? sorry, just trying to understand. 
and resonators don't effectively affect performance so much as they do sound.
those resonators are there to help baffle the sound. any exhaust louder than 95dB is illegal in CA, and hks is already louder than that if i'm not mistaken (not by much). removing those resonators may cause a loud/raspy exhaust.
and resonators don't effectively affect performance so much as they do sound.
those resonators are there to help baffle the sound. any exhaust louder than 95dB is illegal in CA, and hks is already louder than that if i'm not mistaken (not by much). removing those resonators may cause a loud/raspy exhaust.
for example the stock intake vs. z tube pipe
why do people even buy a z tube?
Originally Posted by trueskillz12
wouldnt resonators reduce power since the flow isn't completely smooth?
for example the stock intake vs. z tube pipe
why do people even buy a z tube?
for example the stock intake vs. z tube pipe
why do people even buy a z tube?
people order the ztube to replace the gtube because the gtube has a "resonator," as you called it. the purpose of this "resonator" is to be a sound baffler. this reduces induction noise since our car is meant to be an entry level luxury sport coupe. a lot of g owners that don't look to mod their cars don't want the induction noise to be so loud and thus the sound baffler.
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Originally Posted by aHero4Eternity
what? resonated test pipes and non resonated test pipes perform the same. the ztube and gtube will perform the same.
people order the ztube to replace the gtube because the gtube has a "resonator," as you called it. the purpose of this "resonator" is to be a sound baffler. this reduces induction noise since our car is meant to be an entry level luxury sport coupe. a lot of g owners that don't look to mod their cars don't want the induction noise to be so loud and thus the sound baffler.
people order the ztube to replace the gtube because the gtube has a "resonator," as you called it. the purpose of this "resonator" is to be a sound baffler. this reduces induction noise since our car is meant to be an entry level luxury sport coupe. a lot of g owners that don't look to mod their cars don't want the induction noise to be so loud and thus the sound baffler.
Originally Posted by b00stedjustin
sounds like someone is a little confused lol. Just either install the exhaust system as is or re-sell it and don't ruine it. It's a great system.
Originally Posted by aHero4Eternity
what? resonated test pipes and non resonated test pipes perform the same. the ztube and gtube will perform the same.
people order the ztube to replace the gtube because the gtube has a "resonator," as you called it. the purpose of this "resonator" is to be a sound baffler. this reduces induction noise since our car is meant to be an entry level luxury sport coupe. a lot of g owners that don't look to mod their cars don't want the induction noise to be so loud and thus the sound baffler.
people order the ztube to replace the gtube because the gtube has a "resonator," as you called it. the purpose of this "resonator" is to be a sound baffler. this reduces induction noise since our car is meant to be an entry level luxury sport coupe. a lot of g owners that don't look to mod their cars don't want the induction noise to be so loud and thus the sound baffler.
so you're saying they will perform the same?
i highly doubt it
if the above diagram were 2 straws, you're telling me that blowing out of both of them would create the same force?
i would put money down on non resonated pipes producing more hp than a resonated pipe. less resitriction always mean more hp. even if it's a little, gain is gain. there is always a trade off.
tell me why is the 06 350z rated @ 300 and g35 rated @ 298?
because of the g and z tube difference
side note:
if both z and g are 6mt, there is Continuously Variable Valve Timing Control System (CVTCS) for intake valves and eCVTCS for exhaust valves.
autos only get Continuously Variable Valve Timing Control System (CVTCS) for intake valves.
which is why there is a hp differenece in 6mt and auto
Originally Posted by trueskillz12
http://img118.imageshack.us/img118/1624/hksfw0.jpg
so you're saying they will perform the same?
i highly doubt it
if the above diagram were 2 straws, you're telling me that blowing out of both of them would create the same force?
i would put money down on non resonated pipes producing more hp than a resonated pipe. less resitriction always mean more hp. even if it's a little, gain is gain. there is always a trade off.
tell me why is the 06 350z rated @ 300 and g35 rated @ 298?
because of the g and z tube difference
side note:
if both z and g are 6mt, there is Continuously Variable Valve Timing Control System (CVTCS) for intake valves and eCVTCS for exhaust valves.
autos only get Continuously Variable Valve Timing Control System (CVTCS) for intake valves.
which is why there is a hp differenece in 6mt and auto
so you're saying they will perform the same?
i highly doubt it
if the above diagram were 2 straws, you're telling me that blowing out of both of them would create the same force?
i would put money down on non resonated pipes producing more hp than a resonated pipe. less resitriction always mean more hp. even if it's a little, gain is gain. there is always a trade off.
tell me why is the 06 350z rated @ 300 and g35 rated @ 298?
because of the g and z tube difference
side note:
if both z and g are 6mt, there is Continuously Variable Valve Timing Control System (CVTCS) for intake valves and eCVTCS for exhaust valves.
autos only get Continuously Variable Valve Timing Control System (CVTCS) for intake valves.
which is why there is a hp differenece in 6mt and auto
if only it were as simple as your diagram. in regard to this diagram...to get the same amount of force out of the above one as compared to the bottom one...will it require more force from the engine or less? the engine needs to make more power to make the top one put out the same exhaust level as the bottom. hence if you get rid of the resonator, the louder sound from the same engine.
first of all, free flow is not always a good thing. if it was, then my e-cutout would have blew everyone else's exhaust away. if the exhaust manifolds/headers just dumped to the open atmosphere(not considering sound regulations or emissions issues), somewhat similar to my e-cutout, how would the efficiency of such a system compare an exhaust with full tubing/the right tubing? would the short distance to travel overcome the rapid cool-down effects, and the positive effects of the tubing? if free flow exhausts are most efficient, wouldn't a larger diameter exhaust allow for better flow? i'd assume not as there is such thing as exhaust gas velocity -and it's this velocity that helps "pull" the gasses and helps it out of the engine. when you have a long train of pulses going down a tube, they all help push/pull the others along. for the record, i myself don't know the answers to these questions.
you and i both know, the the exhaust market these days is always hyped up with dyno numbers. when a new exhaust comes out, the first thing most people want to know is the dyno numbers. so why would HKS sacrafice ANY power whatsoever with these resonators? their intentions are not to baffle the sound, as they could care less about US laws - not that HKS is even legal in CA (not sure about the other states). they know that what draws most people's attention is "dyno numbers." so yes, those canisters help create the "exotic" (this is argueable) sound of hks...but i doubt they would be there if they really hurt performance measurably. theoretically, maybe. actually, probably not. this is a good time to remind you, i myself don't know the answers to everything. take my post for what it's worth to you and nothing more.
so with your argument, high flow cats will not perform as well as non resonated test pipes. unfortunately, i can't find the sheets (so you'll have to take my word for what it's worth) but someone dyno'd HFCs and non resonated test pipes the same day under the same conditions etc. etc. and found 1whp difference. now, that is within the margin of error and doesn't support your argument of free flow = more power. yes, that's only one example and i'm sure you can find countless other examples to refute. ultimately, this could go on forever.
i agree that free flow is better - to a point. otherwise, i wouldn't have my HFCs lol. i also like the design of the JIC ypipe, particularly because of it's design. it has less harshly bent piping and thus allowing for a smoother flow for the exhaust. but there gets to a point where there is such a thing as too much free flow, imo.
given that hks is a true dual, it will lose some power in the low end - as with most all true duals. again, too much free flow. but hks, and all other td exhausts are okay with that...they know that. that's just something that comes with all true duals so there isn't much they can do to stop that.
i'm agreeing to disagree for now.
Last edited by Calvin; May 3, 2007 at 02:10 AM.
Originally Posted by aHero4Eternity
if only it were as simple as your diagram. in regard to this diagram...to get the same amount of force out of the above one as compared to the bottom one...will it require more force from the engine or less? the engine needs to make more power to make the top one put out the same exhaust level as the bottom. hence if you get rid of the resonator, the louder sound from the same engine.
first of all, free flow is not always a good thing. if it was, then my e-cutout would have blew everyone else's exhaust away. if the exhaust manifolds/headers just dumped to the open atmosphere(not considering sound regulations or emissions issues), somewhat similar to my e-cutout, how would the efficiency of such a system compare an exhaust with full tubing/the right tubing? would the short distance to travel overcome the rapid cool-down effects, and the positive effects of the tubing? if free flow exhausts are most efficient, wouldn't a larger diameter exhaust allow for better flow? i'd assume not as there is such thing as exhaust gas velocity -and it's this velocity that helps "pull" the gasses and helps it out of the engine. when you have a long train of pulses going down a tube, they all help push/pull the others along. for the record, i myself don't know the answers to these questions.
you and i both know, the the exhaust market these days is always hyped up with dyno numbers. when a new exhaust comes out, the first thing most people want to know is the dyno numbers. so why would HKS sacrafice ANY power whatsoever with these resonators? their intentions are not to baffle the sound, as they could care less about US laws - not that HKS is even legal in CA (not sure about the other states). they know that what draws most people's attention is "dyno numbers." so yes, those canisters help create the "exotic" (this is argueable) sound of hks...but i doubt they would be there if they really hurt performance measurably. theoretically, maybe. actually, probably not. this is a good time to remind you, i myself don't know the answers to everything. take my post for what it's worth to you and nothing more.
so with your argument, high flow cats will not perform as well as non resonated test pipes. unfortunately, i can't find the sheets (so you'll have to take my word for what it's worth) but someone dyno'd HFCs and non resonated test pipes the same day under the same conditions etc. etc. and found 1whp difference. now, that is within the margin of error and doesn't support your argument of free flow = more power. yes, that's only one example and i'm sure you can find countless other examples to refute. ultimately, this could go on forever.
i agree that free flow is better - to a point. otherwise, i wouldn't have my HFCs lol. i also like the design of the JIC ypipe, particularly because of it's design. it has less harshly bent piping and thus allowing for a smoother flow for the exhaust. but there gets to a point where there is such a thing as too much free flow, imo.
given that hks is a true dual, it will lose some power in the low end - as with most all true duals. again, too much free flow. but hks, and all other td exhausts are okay with that...they know that. that's just something that comes with all true duals so there isn't much they can do to stop that.
i'm agreeing to disagree for now.
first of all, free flow is not always a good thing. if it was, then my e-cutout would have blew everyone else's exhaust away. if the exhaust manifolds/headers just dumped to the open atmosphere(not considering sound regulations or emissions issues), somewhat similar to my e-cutout, how would the efficiency of such a system compare an exhaust with full tubing/the right tubing? would the short distance to travel overcome the rapid cool-down effects, and the positive effects of the tubing? if free flow exhausts are most efficient, wouldn't a larger diameter exhaust allow for better flow? i'd assume not as there is such thing as exhaust gas velocity -and it's this velocity that helps "pull" the gasses and helps it out of the engine. when you have a long train of pulses going down a tube, they all help push/pull the others along. for the record, i myself don't know the answers to these questions.
you and i both know, the the exhaust market these days is always hyped up with dyno numbers. when a new exhaust comes out, the first thing most people want to know is the dyno numbers. so why would HKS sacrafice ANY power whatsoever with these resonators? their intentions are not to baffle the sound, as they could care less about US laws - not that HKS is even legal in CA (not sure about the other states). they know that what draws most people's attention is "dyno numbers." so yes, those canisters help create the "exotic" (this is argueable) sound of hks...but i doubt they would be there if they really hurt performance measurably. theoretically, maybe. actually, probably not. this is a good time to remind you, i myself don't know the answers to everything. take my post for what it's worth to you and nothing more.
so with your argument, high flow cats will not perform as well as non resonated test pipes. unfortunately, i can't find the sheets (so you'll have to take my word for what it's worth) but someone dyno'd HFCs and non resonated test pipes the same day under the same conditions etc. etc. and found 1whp difference. now, that is within the margin of error and doesn't support your argument of free flow = more power. yes, that's only one example and i'm sure you can find countless other examples to refute. ultimately, this could go on forever.
i agree that free flow is better - to a point. otherwise, i wouldn't have my HFCs lol. i also like the design of the JIC ypipe, particularly because of it's design. it has less harshly bent piping and thus allowing for a smoother flow for the exhaust. but there gets to a point where there is such a thing as too much free flow, imo.
given that hks is a true dual, it will lose some power in the low end - as with most all true duals. again, too much free flow. but hks, and all other td exhausts are okay with that...they know that. that's just something that comes with all true duals so there isn't much they can do to stop that.
i'm agreeing to disagree for now.
Originally Posted by aHero4Eternity
if only it were as simple as your diagram. in regard to this diagram...to get the same amount of force out of the above one as compared to the bottom one...will it require more force from the engine or less? the engine needs to make more power to make the top one put out the same exhaust level as the bottom. hence if you get rid of the resonator, the louder sound from the same engine.
i understood your overall argument to be that a free flowing exhaust will perform better...and thus non-resonated pipes will perform better than resonated pipes (this being merely an example of free flow/restricting pipes).
but whatever, like i said before. agree to disagree.
but whatever, like i said before. agree to disagree.
Ive only really skimmed over this thread but from what Ive read, the OP sounds like a moron. Why would you buy an exhaust system that is as expensive as it is if you didnt like it and you planned on cutting it up? Seems like a waste to me...
Cal, give it up. He's not worth your time
Cal, give it up. He's not worth your time
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From: Redlands CA
i cut them off and i love the sound it is a low rumble at idle and a really sweet sounding raspy tone when you really step on it and the overrun is AMAZING it pops 2-3 times when it hits 1800 to about 1200 RPM's
