Welcome to the North American Subaru Impreza Owners Club Saturday August 1, 2015
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC General > General Community

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 01-29-2004, 04:54 PM   #26
1FastSTI
Scooby Newbie
 
Member#: 53235
Join Date: Jan 2004
Location: Reading Pa
Vehicle:
2004 STI
Blue

Default

Hey guys it all has the do with the "drive by wire" and the emission contols on the cars. I think someone has mentioned it already.
* Registered users of the site do not see these ads.
1FastSTI is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 01-29-2004, 05:37 PM   #27
rexxer
Scooby Specialist
 
Member#: 27624
Join Date: Oct 2002
Chapter/Region: W. Canada
Location: "Somewhere cheap... Red Deer"
Vehicle:
2014 WRX
White

Default

No drive by wire on the WRX.
rexxer is offline   Reply With Quote
Old 01-29-2004, 05:46 PM   #28
rexxer
Scooby Specialist
 
Member#: 27624
Join Date: Oct 2002
Chapter/Region: W. Canada
Location: "Somewhere cheap... Red Deer"
Vehicle:
2014 WRX
White

Default

Quote:
Originally posted by fliz


That logic is flawed. The mass you remove is still spinning. It's momentum is not magically transferred to the flywheel upon clutch engagement.

The rpms rise because power is being generated in the engine (fuel igniting) without any load.

The power either comes from the ECU dumping fuel for a split second until the intake pressure is relieved (maybe to prevent lean combustion that would increase the EGT's and output of nitrous oxides) or a slow reaction between the release of the gas pedal and the closure of the TB.
Yes, sorry, you are correct.
rexxer is offline   Reply With Quote
Old 01-29-2004, 05:48 PM   #29
Slowpoke
Scooby Specialist
 
Member#: 19879
Join Date: Jun 2002
Location: Boston, MA
Vehicle:
2004 WRX
Java Black

Default

Wow, I'm surprised we are on the 2nd page already and there has not been a single "It happens because you do not know how to drive MT" post.

It's not due to poor driving technique - although altering your driving technique can prevent it.

It's not momentum - momentum will not cause the flywheel to accelerate, it will only slow the rate of deceleration.

Edit: Fixed typo in the 2nd paragraph - I mean to say, it's NOT due to poor driving technique.

Last edited by Slowpoke; 01-30-2004 at 03:51 PM.
Slowpoke is offline   Reply With Quote
Old 01-30-2004, 12:15 AM   #30
Stanley
Scooby Guru
 
Member#: 7374
Join Date: Jun 2001
Location: North Bay, SFCA
Vehicle:
2007 Grandpamobile
BlingBlingBlue

Default

Quote:
Originally posted by Slowpoke
It's due to poor driving technique - although altering your driving technique can prevent it.
I agree altering your driving technique can prevent this from happening. But I disagree that it is from poor technique. It is a quirk to modern turbo charged vehicles to which one has to adapt. You could have perfect technique for a Porsche GT3, but it would have to modified for the quirks of a turbo Impreza...
Stanley is offline   Reply With Quote
Old 01-30-2004, 01:53 AM   #31
alster
Scooby Newbie
 
Member#: 37480
Join Date: May 2003
Location: CA
Default

And that's why I got a lighter pulley...
Here's the link to my review http://forums.nasioc.com/forums/show...hreadid=491523
alster is offline   Reply With Quote
Old 01-30-2004, 02:09 AM   #32
kdmd2b
Scooby Newbie
 
Member#: 6670
Join Date: May 2001
Location: Redlands, CA
Vehicle:
2002 WRX Sedan
WR Blue

Default

Quote:
Originally posted by Slowpoke
Wow, I'm surprised we are on the 2nd page already and there has not been a single "It happens because you do not know how to drive MT" post.

It's due to poor driving technique - although altering your driving technique can prevent it.

It's not momentum - momentum will not cause the flywheel to accelerate, it will only slow the rate of deceleration.
Yes it can be avoided if you wait longer enough between shifts but I know that I can take my foot all the way off the gas before engaging the clutch and it still has the small blip.
kdmd2b is offline   Reply With Quote
Old 01-30-2004, 10:05 AM   #33
DISCOPOPE
Scooby Specialist
 
Member#: 43339
Join Date: Sep 2003
Location: mpls, mn
Vehicle:
2oo4 STi
URgt35r w/t3hM3finj3cki0n

Default

Quote:
Originally posted by Slowpoke
Wow, I'm surprised we are on the 2nd page already and there has not been a single "It happens because you do not know how to drive MT" post.

It's due to poor driving technique - although altering your driving technique can prevent it.

It's not momentum - momentum will not cause the flywheel to accelerate, it will only slow the rate of deceleration.
not poor driving... not poor timing, as stated above, you can have the car in neutral, build boost, blip the pedal, and hear the hang/surge.... i'm betting on emmisions.
DISCOPOPE is offline   Reply With Quote
Old 01-30-2004, 03:55 PM   #34
Slowpoke
Scooby Specialist
 
Member#: 19879
Join Date: Jun 2002
Location: Boston, MA
Vehicle:
2004 WRX
Java Black

Default

Quote:
Originally posted by Stanley
Quote:
It's due to poor driving technique - although altering your driving technique can prevent it.
I agree altering your driving technique can prevent this from happening. But I disagree that it is from poor technique. It is a quirk to modern turbo charged vehicles to which one has to adapt. You could have perfect technique for a Porsche GT3, but it would have to modified for the quirks of a turbo Impreza...
Sorry that was a huge typo on my part, I meant to say, "It's not due to poor driving technique". In the context of my entire message, or even in the context of that sentence that you quoted, I'm sure that makes a whole lot more sense now
Slowpoke is offline   Reply With Quote
Old 01-31-2004, 01:01 PM   #35
Zuffy
Scooby Specialist
 
Member#: 35268
Join Date: Apr 2003
Chapter/Region: W. Canada
Location: Canada
Vehicle:
2004 WRX Stg2 & with
added PDX goodness

Default

Hummmmm, this querk has always frustrated me, when the engine has boost and I go to shift, there's a unwanted blip between shifts. I guess there has to me a longer delay between the point where, the right foot is out of the gas and the point where the clutch is disengaged. The combination of actions still needs to be performed quickly and smoothy or else jerky shifts result. I guess practice makes perfect.

I noticed that it doesn't seem to happen in the 1-2 shift, but more on the 2-3, and 3-4 shifts. I assume it's because it's because the WRX is boost limited in 1st gear, so this problem isn't as prevailent.
Zuffy is offline   Reply With Quote
Old 02-01-2004, 12:40 PM   #36
rodon
Scooby Newbie
 
Member#: 36372
Join Date: May 2003
Location: Delaware
Vehicle:
'03 WRX Sedan
Silver

Default

This has just started happening with my car at around the 12,000 mile mark - and I haven't changed my driving technique. I'm concerned the the BOV is hanging up a bit.
rodon is offline   Reply With Quote
Old 02-01-2004, 12:45 PM   #37
SWRX
Scooby Specialist
 
Member#: 52706
Join Date: Jan 2004
Chapter/Region: SCIC
Location: SoCal
Default

I just got my 2004 WRX about 3 weeks ago, i noticed that "rpm jump" almost every time when I'm accelerating (doesn't have to be hard accelerating) and upshifting between 3500 rpm to 4200 rpm. I have about 1300 miles on my car. I noticed this "jump" when I first got the car... ...what to do?? what to do??
SWRX is offline   Reply With Quote
Old 02-01-2004, 02:37 PM   #38
Thevaliantknite
Scooby Newbie
 
Member#: 49272
Join Date: Nov 2003
Chapter/Region: SCIC
Location: Ca, Yorba Linda
Vehicle:
02 WRX & STi>Past

Default

i checked this out last night and it doesnt do it when you let all the way off the gas. the gas pedal is erally sensetive and even basically when your foot is touching it it will have a little play. beacuse i put it in neutral to make sure and the rpm's go up about as much as the "spike". so i say that is how you drive, not the car.
Thevaliantknite is offline   Reply With Quote
Old 02-02-2004, 10:26 AM   #39
Undepelo
Scooby Specialist
 
Member#: 34960
Join Date: Apr 2003
Chapter/Region: MAIC
Location: MD
Vehicle:
What would baby
Jesus say of OT?

Default

Could it be that leftover boost in the mainfold is just pushing the pistons on the intake cycle even though there is no fuel?
Undepelo is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
noise when letting off the gas crxgator Transmission (AT/MT) & Driveline 2 06-28-2009 10:25 PM
rpm spike when coming to a stop fnlyfnd Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 10 12-04-2008 06:20 PM
RPM spikes when shifting apak123 Newbies & FAQs 9 08-24-2005 02:15 PM
grr. EGT's spike when letting of the gas (highway cruise) :( munkis Normally Aspirated with bolt-on Forced Induction Powertrain 20 06-14-2004 06:32 PM
RPMs spike when shifting? quynce Newbies & FAQs 15 06-21-2002 05:42 PM


All times are GMT -4. The time now is 04:32 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2015, North American Subaru Impreza Owners Club, Inc.