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The rev's slow to drop problem exists whenever the revs go above say 3000 regardless of which gear, it's just more noticable with 1st to 2nd.
This problem punishes the synchromesh.
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No offense to any one who has done this mod but, the "hanging revs" was most likely designed that way on purpose to make driving and shifting a manual transmission a much more pleasant and invisible experience for the regular driver. I for one am not a typical driver most of the time but, in the moments that I am in a relaxed and causal state the shifting feels easier and care free...it leaves the revs up for a just a little bit longer to make the shift less obvious.
Granted this comes at cost of performance...I can live with it though.
__________________ 2005 Spark Blue Spectra 5 with 108k on it.
Drives: 1982 Fiat Spyder, 2007 VW Eos 2L Turbo, 2005 Kia Spectra5
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I don't believe Kia did this for ease of shifting, but instead for emissions reasons. A sudden drop in revs dumps raw fuel into the exhaust. I find it much easier to shift with the revs dropping quickly. Our other cars do not let the revs hang and I found the Kia to be annoying to shift. This fix is relatively minor and can be changed back easily. If you are happy with your car the way it is, that's great! Don't fix what ain't broke.
Quote:
Originally Posted by axl_rose
No offense to any one who has done this mod but, the "hanging revs" was most likely designed that way on purpose to make driving and shifting a manual transmission a much more pleasant and invisible experience for the regular driver. I for one am not a typical driver most of the time but, in the moments that I am in a relaxed and causal state the shifting feels easier and care free...it leaves the revs up for a just a little bit longer to make the shift less obvious.
Granted this comes at cost of performance...I can live with it though.
Considering all this talk of shifting.... I know on Elantras many owners do what they call the "Clutch Valvectomy". Basically, there's a restrictor orifice in the hydraulic clutch that prevents abrupt shifts. No matter how quickly you let out the clutch pedal, the orifice prevents a sudden clutch engagement. I'm not sure if they put this in for ease of shifting or because they knew the revs would hang or what, but it keeps the clutch from engaging all at once. Allowing only a slow engagement, though, can increase clutch wear.
So many Elantra owners simply remove the restrictor orifice to provide more control over clutch engagement. I am not 100% positive the Spectra has the same piece, but if it does, removing it can improve the shift feel of the car and increase the clutch life.
Drives: 1982 Fiat Spyder, 2007 VW Eos 2L Turbo, 2005 Kia Spectra5
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This looks interesting. A friend of mine who is into BMW's says later models also have this valve. He said it's basically for people who don't know how to shift and who stall the car by letting out the clutch too quickly. People in the know, remove them. I will give this a try as soon as I have some time.
Thanks both you guys for all the info. I took the plastic cover off, and used your great photo on the Elantra forum to locate the idle control valve, which seems a bit different than the Kia. I am about to go in now, and would have been lost without that photo. I replaced the slave cylinder on my '86 Camry, so I'm going to give it a rip taking that valve and spring out as well. What a great link!
Thanks again,
mantraelantra
PS It's a bit more stressful tearing apart my new car compared to the old Camry, but bet high and sleep in the streets, I say.
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