is 260whp at 4500ft elevation possible with stock exh+hfc?
08-02-2010, 11:29 AM
#1
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is 260whp at 4500ft elevation possible with stock exh+hfc?
or am i dreaming?
is it possible or am i setting the bar too high? would prob do most internals so i could rev to 8000, cams, and maybe a stroker kit if sleeves arent required. thoughts? its on a DEvq, auto trans, g35 coupe
is it possible or am i setting the bar too high? would prob do most internals so i could rev to 8000, cams, and maybe a stroker kit if sleeves arent required. thoughts? its on a DEvq, auto trans, g35 coupe
08-02-2010, 01:18 PM
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I second this. And I understand that you are using the stock exhaust to control the ehaust note but, this would be like building the motor around the exhaust. This isn't the most productive way to spend time or money.
08-02-2010, 01:25 PM
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08-02-2010, 01:28 PM
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ok, fair enough, good points. i just do not like the sound of aftermarket exhausts. to me they sound loud and annoying. i was hoping to hear that the stock exhaust was fairly decent and would only limit the power slightly. is it really that bad? what about 250whp?
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08-02-2010, 02:07 PM
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Cow drowning in syrup.. Hehe... Best description of stock exhaust note I've heard.... If your not fond of loud exhausts you can always buy a setup that isn't........ Loud that is. I've hears plenty of non restrictive exhausts that are easily as quiet as stock. And based on your future mod list money doesn't seem to be a factor so throw some motordyne art pipes on and clean/quiet that exhaust note even more. Tanabe's medallion touring exhaust is fairly quiet. If your going to put that kind of money into internals why leave cheaper and easier to obtain hp on the table? Good luck
08-02-2010, 02:28 PM
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Cow drowning in syrup.. Hehe... Best description of stock exhaust note I've heard.... If your not fond of loud exhausts you can always buy a setup that isn't........ Loud that is. I've hears plenty of non restrictive exhausts that are easily as quiet as stock. And based on your future mod list money doesn't seem to be a factor so throw some motordyne art pipes on and clean/quiet that exhaust note even more. Tanabe's medallion touring exhaust is fairly quiet. If your going to put that kind of money into internals why leave cheaper and easier to obtain hp on the table? Good luck
i dont like the very loud exhausts, but i also dont like the lower pitched exhausts, which is what seems to be the case with aftermarket systems. i guess im just very picky since i seem to be in the minority here. to be honest, i really like the sound with just hfc added, minus that terrible rasp of course.
either way, anyone have any idea on how much an exhaust is worth on a mildly built 11.1:1 high-rev de?
Last edited by mgrotel; 08-02-2010 at 02:31 PM.
08-02-2010, 02:28 PM
#11
I think what everyone is trying to say is, you're being counter productive with your mod selections. First determine how far you want to go then factor in the amount of livability you're willing to lose (Noise included). At that point you can better judge if what your thinking about is worth trying.
To me, its sounds like you don't want a loud exhaust. However, to do all of that to a motor and then bottleneck all your mods in the exhaust wouldn't make sense.
To me, its sounds like you don't want a loud exhaust. However, to do all of that to a motor and then bottleneck all your mods in the exhaust wouldn't make sense.
Last edited by Zazz93; 08-02-2010 at 03:35 PM.
08-02-2010, 02:46 PM
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^thats a good point.
maybe i should explain how i got to this point. my car is almost at 100,000 miles. because of the high miles, i almost sold it to get something else, but i dont really want a car payment right now so i decided to keep it. like most, i am never satisfied with stock power, so for a while i was spraying nitrous. but, i kept detonating, and no matter what i threw at it, it would not stop detonating. long story short, the motor runs good now, but i dont know how long it will last. since i dont want a payment, i am left with building an engine, or just getting a junk yard replacement when it goes. building one sounds like a lot more fun. i figure since im building, i might as well throw some cams etc at it. dont want boost because i want reliability.
maybe i should explain how i got to this point. my car is almost at 100,000 miles. because of the high miles, i almost sold it to get something else, but i dont really want a car payment right now so i decided to keep it. like most, i am never satisfied with stock power, so for a while i was spraying nitrous. but, i kept detonating, and no matter what i threw at it, it would not stop detonating. long story short, the motor runs good now, but i dont know how long it will last. since i dont want a payment, i am left with building an engine, or just getting a junk yard replacement when it goes. building one sounds like a lot more fun. i figure since im building, i might as well throw some cams etc at it. dont want boost because i want reliability.
08-02-2010, 05:43 PM
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You must ask if you could nit get the car properly tuned with nitrous who is going to tune it with the new engine?
A z with basic bolt ons properly tuned on drag radials should not have an issue running at or near 13.5 at that elevation.
There are more than a few mild sounding exhausts fwiw
Have you set a budget? Decisions at this level
of mods tend to be dashed or realized by $
Wait, you're trying to achieve a 13.5 and you have no
idea what it runs now ? Talk about cart before horse.
A z with basic bolt ons properly tuned on drag radials should not have an issue running at or near 13.5 at that elevation.
There are more than a few mild sounding exhausts fwiw
Have you set a budget? Decisions at this level
of mods tend to be dashed or realized by $
Wait, you're trying to achieve a 13.5 and you have no
idea what it runs now ? Talk about cart before horse.
Last edited by Z1 Performance; 08-02-2010 at 05:47 PM.
08-02-2010, 05:52 PM
#16
You might want to look into Motordyne's VQ exhaust. It tries to keep the stock exhaust note while allowing for some performance. There's a video of it somewhere and it sounds really close to stock. 260whp is very realistic but without a full exhaust, you won't be able to hit it. I hit 267whp with just the nismo exhaust, ART pipes, popcharger, and a osiris tune, of course that was at 300ft elevation.
08-02-2010, 06:40 PM
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You must ask if you could nit get the car properly tuned with nitrous who is going to tune it with the new engine?
A z with basic bolt ons properly tuned on drag radials should not have an issue running at or near 13.5 at that elevation.
There are more than a few mild sounding exhausts fwiw
Have you set a budget? Decisions at this level
of mods tend to be dashed or realized by $
Wait, you're trying to achieve a 13.5 and you have no
idea what it runs now ? Talk about cart before horse.
A z with basic bolt ons properly tuned on drag radials should not have an issue running at or near 13.5 at that elevation.
There are more than a few mild sounding exhausts fwiw
Have you set a budget? Decisions at this level
of mods tend to be dashed or realized by $
Wait, you're trying to achieve a 13.5 and you have no
idea what it runs now ? Talk about cart before horse.
tuning for nitrous is not difficult, something weird was going on with the car, i pulled a lot of timing, monitored a/fs, installed methanol injection, lowered the shot size dramatically, etc. but i have been over that in the proper section already, and to answer your question, with cams i would have it professionally tuned. although i did some tuning without nitrous and definitely got more power by logging a base map, tuning to 13:1, and advancing timing until i saw the slightest knock.
i dont have a z, i have a g which is heavier, its an auto, and i dont have drag radials, so maybe that has something to do with the times, although the transgo valvebody shift kit shifts very very fast. the time i went to the track it was raining so i was in the 16s, spinning through second and then some. i guessed at the 14.5 because that is what others have done in the area. but we are getting quite a ways off topic.
have not set a budget, because im not in a hurry to get it done and i can just build as time permits, but if i had to nail down a specific number, i would say i would be ok with spending about 8000 from start to finish. i already got the block and all accessories for 700.
videos of exhausts never give an accurate representation of what it sounds like in person. its too dependent on the sound system and other things. i guess i will do some more research looking for quieter exhausts. any other exhaust suggestions?
whew, did i miss anything? oh yea, is the stock exhaust going to restrict a mild high-rev build that much?
08-02-2010, 06:42 PM
#20
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You might want to look into Motordyne's VQ exhaust. It tries to keep the stock exhaust note while allowing for some performance. There's a video of it somewhere and it sounds really close to stock. 260whp is very realistic but without a full exhaust, you won't be able to hit it. I hit 267whp with just the nismo exhaust, ART pipes, popcharger, and a osiris tune, of course that was at 300ft elevation.