Back to stock plenum from Crawford..interesting
04-28-2005, 12:57 PM
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Back to stock plenum from Crawford..interesting
I decided to take off the Crawford plenum recently and go back to stock for a while before I decide on another plenum. Strange enough my car feels much much quicker. I didn't know what to make of this honestly, so I let a good buddy of mine (who has enough experience in my car) take it for a spin to get his opinion. Never the less he agreed with me! Im sitting there wonndering what could possibly have happened. Install and uninstall went perfectly normal for all I remember. I casually glance down at the odometer and it said 5030..thats when I remembered someone saying the car gets quicker after 5000 miles. Anyone know what happened here.....Is the 5k theory true? I thought typical break in was around 1200miles max...Your thoughts please bc im really impressed with the cars power afterwards? The only other mod I have is the Greddy Evo exhaust...... 
04-28-2005, 01:13 PM
#3
see this thread:
https://my350z.com/forum/tuning/119243-any-current-ts-reflash-experiences.html
we're discusing a theory about the ECU degrading performance for the sake of emissions.
Maybe when you added the crawford plenum, it added power at first, but later stole it back from you via pulling timing. Once you removed it, maybe the ECU determined it could add the timing back?
https://my350z.com/forum/tuning/119243-any-current-ts-reflash-experiences.html
we're discusing a theory about the ECU degrading performance for the sake of emissions.
Maybe when you added the crawford plenum, it added power at first, but later stole it back from you via pulling timing. Once you removed it, maybe the ECU determined it could add the timing back?
Last edited by sentry65; 04-28-2005 at 01:20 PM.
04-28-2005, 04:31 PM
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Maybe a leak in the install process of the plenum? This is the first time I've read of someone having even a remote loss in power b/c of the plenum. Oh well, more power the better! I have mine on the way, I'll post my findings.
ravi
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04-28-2005, 05:23 PM
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Originally Posted by GQ 350z
Maybe a leak in the install process of the plenum? This is the first time I've read of someone having even a remote loss in power b/c of the plenum. Oh well, more power the better! I have mine on the way, I'll post my findings.
ravi
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04-28-2005, 05:39 PM
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give me a break...
you are relying on your butt dyno and how the car feels to determine if it is quicker w/o the plenum? you cannot be serious?
the only way to be sure is to have gotten the car dyno'd. anything is pure speculation and a waste of time.
plenums have proven to increase horsepower.
you are relying on your butt dyno and how the car feels to determine if it is quicker w/o the plenum? you cannot be serious?
the only way to be sure is to have gotten the car dyno'd. anything is pure speculation and a waste of time.
plenums have proven to increase horsepower.
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04-28-2005, 05:47 PM
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Originally Posted by drsifu
give me a break...
you are relying on your butt dyno and how the car feels to determine if it is quicker w/o the plenum? you cannot be serious?
the only way to be sure is to have gotten the car dyno'd. anything is pure speculation and a waste of time.
plenums have proven to increase horsepower.
you are relying on your butt dyno and how the car feels to determine if it is quicker w/o the plenum? you cannot be serious?
the only way to be sure is to have gotten the car dyno'd. anything is pure speculation and a waste of time.
plenums have proven to increase horsepower.
04-28-2005, 05:55 PM
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sorry if i came off wrong.
but i don't believe you can feel your car going faster, unless there was a huge change in power when the crawford was removed.
the reason for dyno is hard numbers, or the best you can get given the science of dyno testing.
did the car feel faster in the low rpm's or high rpm's? maybe he re-gained some low-end torque.
nevermind....maybe the car does feel faster w/o the plenum. since feeling is objective, i'll leave it at that.
but i don't believe you can feel your car going faster, unless there was a huge change in power when the crawford was removed.
the reason for dyno is hard numbers, or the best you can get given the science of dyno testing.
did the car feel faster in the low rpm's or high rpm's? maybe he re-gained some low-end torque.
nevermind....maybe the car does feel faster w/o the plenum. since feeling is objective, i'll leave it at that.
04-28-2005, 06:06 PM
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I thought about the fact that I will regain torque down low once removed....but even on the highway in 5th the car pulls really well. I was easily at 110mph. Before, it felt like it would take forever. Im actually kinda worried that there is such a difference....oh well I guess I'll just enjoy it and leave it at that.
04-28-2005, 06:20 PM
#12
when i first put my crawford V5 plenum on, I noticed the sound difference and I *think* I noticed more power up top, but wasn't at all like "holy crap!!!!!" like some of the early adopters have written. I kinda felt cheesed out with how overhyped MANY of these products are.
Maybe I'm just expecting too much from parts to make me say "holy crap!!!!"
Maybe I'm just expecting too much from parts to make me say "holy crap!!!!"
04-28-2005, 06:23 PM
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Originally Posted by sentry65
when i first put my crawford V5 plenum on, I noticed the sound difference and I *think* I noticed more power up top, but wasn't at all like "holy crap!!!!!" like some of the early adopters have written. I kinda felt cheesed out with how overhyped MANY of these products are.
Maybe I'm just expecting too much from parts to make me say "holy crap!!!!"
Maybe I'm just expecting too much from parts to make me say "holy crap!!!!"
04-28-2005, 06:36 PM
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Originally Posted by zman1910
+1...thats why im ending it and going straight to FI
04-28-2005, 06:41 PM
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Originally Posted by phile
I'd love to go FI, but engine reliability becomes a problem. Oh, and I'm going to upgrade the suspension/wheels/tires before anything else.
04-28-2005, 08:16 PM
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Originally Posted by sentry65
Maybe I'm just expecting too much from parts to make me say "holy crap!!!!"
If you plan to also invest in forged internals, add a tranny cooler, a power steering fluid cooler, a larger radiator, and a new thermostat, you might do OK if you only plan to drive your car 10k mi./yr., sell it in several yrs, and don't drive it like a mutt all the time.
OTOH, why not just buy a new C6 ZO6 'Vette (500 hp) if you're a raw power junkie? It won't cost much if any more than a Z w/all the above, even a base level if you add all the "typical" mods of sound system, rims, intake, exhaust, body kit, etc., and the ZO6 will still be more exotic, even if your blown Z could outrun it, which is possible but unlikely.
For many of us who HATE taking our cars in for repairs, who put 25k mi./yr. on our Z as a primary daily driver, and plan to have the car for possibly 100k mi. or more, it ISN'T worth the risk. That's the great thing about a free country, though; to each his own.
04-28-2005, 08:38 PM
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Originally Posted by OneFast944Turbo
Very sorry but what is a Plenum? IS that what oyu guys call an intake?
04-29-2005, 07:08 AM
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zman1910's exactly right: the problem with the stock upper plenum is that it is designed as a "wedge," which robs cyl. 5 & 6 (the two "front" ones) of air for a faster intake needed to keep a proper F/A mix, esp. above 5krpm. Sad thing is, the only apparent reason for it was to get it under the stock strut bar on the vert., and to accomodate that lovely, tasteful, plastic gladiator shield over the front of the plenum.
And I'm also happy you got a helpful response to your question. One of my partners is a certified car nut and drives a Boxster S; one of my neighbors mods American muscle cars; and neither one had any idea what a "plenum" was until I said the magic words, "intake manifold." But when most of the people on here talk about the plenum, they mean "upper plenum," which is the top part of the intake manifold.
And I'm also happy you got a helpful response to your question. One of my partners is a certified car nut and drives a Boxster S; one of my neighbors mods American muscle cars; and neither one had any idea what a "plenum" was until I said the magic words, "intake manifold." But when most of the people on here talk about the plenum, they mean "upper plenum," which is the top part of the intake manifold.
04-29-2005, 07:56 AM
#20
Originally Posted by Darthvol
I agree w/some that the only single "holy crap!!!!" mod is a FI kit; probably a TT that will get you over 500 at the rear wheels. Unfortunately, you also go "holy crap!!!!" 20-30k mi. later when your engine/tranny blows up.
If you plan to also invest in forged internals, add a tranny cooler, a power steering fluid cooler, a larger radiator, and a new thermostat, you might do OK if you only plan to drive your car 10k mi./yr., sell it in several yrs, and don't drive it like a mutt all the time.
OTOH, why not just buy a new C6 ZO6 'Vette (500 hp) if you're a raw power junkie? It won't cost much if any more than a Z w/all the above, even a base level if you add all the "typical" mods of sound system, rims, intake, exhaust, body kit, etc., and the ZO6 will still be more exotic, even if your blown Z could outrun it, which is possible but unlikely.
For many of us who HATE taking our cars in for repairs, who put 25k mi./yr. on our Z as a primary daily driver, and plan to have the car for possibly 100k mi. or more, it ISN'T worth the risk. That's the great thing about a free country, though; to each his own.
If you plan to also invest in forged internals, add a tranny cooler, a power steering fluid cooler, a larger radiator, and a new thermostat, you might do OK if you only plan to drive your car 10k mi./yr., sell it in several yrs, and don't drive it like a mutt all the time.
OTOH, why not just buy a new C6 ZO6 'Vette (500 hp) if you're a raw power junkie? It won't cost much if any more than a Z w/all the above, even a base level if you add all the "typical" mods of sound system, rims, intake, exhaust, body kit, etc., and the ZO6 will still be more exotic, even if your blown Z could outrun it, which is possible but unlikely.
For many of us who HATE taking our cars in for repairs, who put 25k mi./yr. on our Z as a primary daily driver, and plan to have the car for possibly 100k mi. or more, it ISN'T worth the risk. That's the great thing about a free country, though; to each his own.
I plan on having my 350 way beyond 150k, especially with the miles I put on each year. It's why I will never go FI, besides being way to expensive to maintain. But if you have plenty of dough, I say do it, FI is always fun
I have 1500 miles on my AAM spacer and it still pulls hard. It was instant gratification...imo, BBB for the butt dyno!
Zquicksilver