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08-13-2003, 10:03 PM | #1 |
Scooby Specialist
Member#: 31948
Join Date: Jan 2003
Location: SoCal
Vehicle:2004 STi Aspen White |
Noob Question
my previous stick car was so damn old i can't compare to any modern day stick cars.
hence the newbie question. every time shift from 4 to 5 , or 5 to 6, the RPM would rise about 700 rpm or so as i clutch in. i thought it might be that my foot was still on the gas. but i tried to take my foot off the gas for 1/2-1 second before i clutch in.. it still does the rpm rising thing. i usually shift @ 3500-4000 rpm (break in), but going from 4-5 the engine revs a little more than 4000 rpm, it bothers me because the shift up indicator will sound which scares me a tiny bit. i thought this hike in rpm should happen in low gears rather than high gear, but i haven't noticed anything in the low gears.. Does it sound weird to you guys? |
08-13-2003, 10:07 PM | #2 |
Scooby Specialist
Member#: 31948
Join Date: Jan 2003
Location: SoCal
Vehicle:2004 STi Aspen White |
i asked my buddy who drives a 350 Z.
He said he never paid attention to that, but he tried it out as we were talking over the phone. He said the Z risese rpm as you clutch in in low gears, neutral to 1st, 1st to 2nd.. |
08-13-2003, 11:23 PM | #3 |
Scooby Newbie
Member#: 38643
Join Date: Jun 2003
Location: Boise, ID
Vehicle:2004 STi Silver/Silver |
I have noticed something similar with mine, too. When I go to shift and push in clutch/let off gas, the car seems to maintain its RPMs for a couple seconds (sometimes it even rises by a couple hundred RPM). The only other vehicle I've ever seen do this my my dad's old Chevy truck, and that was because it had problems with the cruise control.
Huh. |
08-13-2003, 11:38 PM | #4 |
Scooby Specialist
Member#: 31948
Join Date: Jan 2003
Location: SoCal
Vehicle:2004 STi Aspen White |
do you know in what gear it does this?
seems like mine only does it in high gears in lower gears, once i clutch in. the RPM drops instantly |
08-14-2003, 08:22 AM | #5 |
Scooby Guru
Member#: 32636
Join Date: Feb 2003
Chapter/Region:
MWSOC
Location: Dayton, OH
Vehicle:2004 Impreza STi Silver/Silver |
I wonder if this could be Dive by Wire lag; or if it could be intentional so some people don't need to heel-toe and can granny shift. Maybe the ECU monitors to see if a person is not heel-toeing properly and then sets a granny shift mode on?? I would be interested in this answer as well.
offset |
08-14-2003, 12:38 PM | #6 |
Scooby Specialist
Member#: 31948
Join Date: Jan 2003
Location: SoCal
Vehicle:2004 STi Aspen White |
not on high gear upshifts
i thought about it. thats why the low gear rpm rise makes more sense. |
08-14-2003, 12:45 PM | #7 |
Scooby Newbie
Member#: 27616
Join Date: Oct 2002
Location: Tucson, Az
Vehicle:2004 STi White |
Could it be some kind of BOV delay? The surge from the turbo could be keeping the rpms up if this happens. Just a thought.
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08-14-2003, 02:26 PM | #8 |
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Join Date: Jul 2003
Chapter/Region:
MWSOC
Location: Chicago
Vehicle:2017 BRZ WRB |
Maybe it's because all of a sudden you've release all this weight from the engine. Previously the engine is using a certain amount of air and fuel, as soon as you put in the clutch, you're still using that amount of a/f but pushing almost no weight so the engine actually speeds up for a second before the a/f is cut to bring the engine down to idle...
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08-14-2003, 02:41 PM | #9 |
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Chapter/Region:
NESIC
Location: N. Kingstown RI
Vehicle:2oo4 WRX PSM Sedan 2oo3 MINI cooper RED/WHT |
with my boring old wrx, when I shift with very little time off the gas the rpms go up a bit, but if I take my foot off the gas a bit earlier they drop right off the bat. I think (<---- complete idiot, do not listen) the turbo is still pushing some air in there, and when you disengage the drivetrain the rpms spike a wee bit....
Who knows, but that was my thinking.... It was annoying hwen braking in though because if you take it right to 4k rpms while accelerating it would always go up to like 4250 or 4300... Ben |
08-15-2003, 12:42 PM | #10 |
Scooby Specialist
Member#: 31948
Join Date: Jan 2003
Location: SoCal
Vehicle:2004 STi Aspen White |
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