Welcome to the North American Subaru Impreza Owners Club Tuesday July 22, 2014
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 Technical > Engine Management & Tuning

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 01-22-2005, 07:10 PM   #1
mistaboosta
Scooby Newbie
 
Member#: 68722
Join Date: Aug 2004
Default stall problem after flywheel install

Did anyone experienced such a problem after the lightened flywheel
I've got the Exedy and sometimes the car stalls at idle just all of a sudden.
* Registered users of the site do not see these ads.
mistaboosta is offline   Reply With Quote
Old 01-22-2005, 07:18 PM   #2
SaabTuner
Scooby Specialist
 
Member#: 67608
Join Date: Aug 2004
Location: SoCal
Default

Next comes the camshaft timing belt ...

Remember that, between combustions (they're not constant), only the inertia of the flywheel, crankshaft, and pully's really keeps the engine rotating. In fact, it's all that powers the car forward when the crankshaft is parrallel with the ground on the boxer 4 cyllinder, because no net rotational-force is acting on it at that time other than "the inertial force".

Sooo ... take away too much weight, sometimes the engine doesn't make it between combustions. All it would take is one or two mis-fires in a row to stal it. Normally that wouldn't even be noticed exept as a bump in the idle.

Adrian~

p.s. One of the advantages to 6, 8 (only with 180 crank), 10, and 12 cyllinder engines is the fact that there is always some amount of "push" from the pistons creating useful torque against the crankshaft. 180 degree cranks in V8's, such as in Ferrari's, and 6 cyllinders are renowned for smoothness; that is part of the reason. They can also have drastically reduced rotating mass for their displacement as a result.
SaabTuner is offline   Reply With Quote
Old 01-23-2005, 09:47 AM   #3
mistaboosta
Scooby Newbie
 
Member#: 68722
Join Date: Aug 2004
Default

You are right Adrian but as i knew about this already, i didn't go with a lightened pulley or too light flywheel (like ACT or else, The exedy is 14.9 lbs).

btw if there was a misfire, shouldn't i receive some CELs??? I had no CEL yet.

p.s: This happens only when the car is not on a gear. So do you still think that the timing belt would jump some teeths?

Thanks for the nice info
mistaboosta is offline   Reply With Quote
Old 01-23-2005, 11:54 AM   #4
SaabTuner
Scooby Specialist
 
Member#: 67608
Join Date: Aug 2004
Location: SoCal
Default

Nah ... just a 15 lb flywheel probably won't make your timing belt jump teeth. Takes a lot of mods to get that far ...

It doesn't have to be a "misfire" ... even a combustion irregularity, such as a late burn, on two cyllinders in a row could cause a car to stall with a much lighter flywheel. Seems to me though, with a 15 lb flywheel you should be ok, or lots of others should be having troubles.

Hmmm ... weird. Not sure how else to explain it unless something got bumped and disconnected in the instal.

Adrian~
SaabTuner is offline   Reply With Quote
Old 01-23-2005, 01:00 PM   #5
mistaboosta
Scooby Newbie
 
Member#: 68722
Join Date: Aug 2004
Default

maybe the exedy flywheel and rps max clutch don't make well togather??

the car stalls as if it has a serious boost leak somewhere. Once one of my intercooler pipes was loosen and the car was stalling at idle just like this. all of a sudden very smoothly.

thanks again for your help.
mistaboosta is offline   Reply With Quote
Old 01-23-2005, 07:18 PM   #6
SaabTuner
Scooby Specialist
 
Member#: 67608
Join Date: Aug 2004
Location: SoCal
Default

Whoa ... is the clutch a lot lighter than the OEM!!???? That would do it!!
SaabTuner is offline   Reply With Quote
Old 01-24-2005, 06:19 PM   #7
mistaboosta
Scooby Newbie
 
Member#: 68722
Join Date: Aug 2004
Default

well i'm not sure how light or heavy the clutch is

BTW I have the gt-spec headers and the gasket at uppipe-headers connection has a very very serious leak issue. Does that also cause stalling at idle ?
mistaboosta is offline   Reply With Quote
Old 01-24-2005, 07:34 PM   #8
Unabomber
Big Ron
Moderator
 
Member#: 18062
Join Date: Apr 2002
Chapter/Region: MAIC
Location: I can save you a ton of cash
Vehicle:
on car parts so PM
me b4 j00 buy

Default

Leaks don't cause you to stall. Do you have a lightened pulley as well?
Unabomber is offline   Reply With Quote
Old 01-24-2005, 09:05 PM   #9
quazimoto
Scooby Guru
 
Member#: 70395
Join Date: Sep 2004
Chapter/Region: MAIC
Location: Da-boonies,Va
Default

I'm running the ACt streetlite flywheel(13.9lbs) and a Spec "stage l" clutch kit and cars idles and drives like stock.
quazimoto is offline   Reply With Quote
Old 01-25-2005, 04:49 AM   #10
mistaboosta
Scooby Newbie
 
Member#: 68722
Join Date: Aug 2004
Default

No my car has only lightened flywheel and in order not to reduce the inertia much I didn't go with another lightened part. Also the flywheel is not so much light as ACT. It's 14.9lbs afterall.


I wonder what causes this stall..
It happens like this:

First the idle becomes rough and rpm changes between 600 - 900 and then the rpms drop and the car stall. Can it be just a rough idle problem ???

I didn't have it until my last garage visit. We installed flywheel, rps max clutch, inlet pipe, smc alky inj.

I guess it is something about the clutch or the flywheel or both.
mistaboosta is offline   Reply With Quote
Old 01-25-2005, 09:29 AM   #11
mbiker97
Scooby Guru
 
Member#: 7922
Join Date: Jun 2001
Chapter/Region: MWSOC
Location: Tucson
Vehicle:
04 CTS-V b/b/b
99 GMC Highrider

Default

Quote:
Originally Posted by mistaboosta
We installed flywheel, rps max clutch, inlet pipe, smc alky inj.
Your inlet pipe is probably loose. Check the connections. The Exedy flywheel (or any lightened flywheel) won't cause your car to just stall at a light. It generally throws misfire codes if it is too light. The Exedy isn't too light though.
mbiker97 is offline   Reply With Quote
Old 01-25-2005, 09:30 AM   #12
mbiker97
Scooby Guru
 
Member#: 7922
Join Date: Jun 2001
Chapter/Region: MWSOC
Location: Tucson
Vehicle:
04 CTS-V b/b/b
99 GMC Highrider

Default

double post.

Last edited by mbiker97; 01-26-2005 at 09:56 AM.
mbiker97 is offline   Reply With Quote
Old 01-25-2005, 07:45 PM   #13
mistaboosta
Scooby Newbie
 
Member#: 68722
Join Date: Aug 2004
Default

that might be possible because i realized that I hear the noise of the turbo more than before.


Another thing i found out is that, this happens only after some hard driving.
mistaboosta is offline   Reply With Quote
Old 01-27-2005, 04:57 PM   #14
mistaboosta
Scooby Newbie
 
Member#: 68722
Join Date: Aug 2004
Default

i've checked the inlet pipe and the smc injection nozzle. No problems there.

It is very weird.

This only happens after I push hard on the car. I stop and take the car out of gear. The idle starts to become funny going up and down pegging between 600 - 1000 and the car stalls.
mistaboosta is offline   Reply With Quote
Old 01-28-2005, 12:06 PM   #15
ride5000
Scooby Guru
 
Member#: 32792
Join Date: Feb 2003
Chapter/Region: NESIC
Location: lincoln, ri
Vehicle:
2003 GGA MBP
12.9 / 105+

Default

have you cleaned your IAC recently? inspected it at least?
ride5000 is offline   Reply With Quote
Old 01-28-2005, 01:19 PM   #16
Hitokiri
Scooby Specialist
 
Member#: 2604
Join Date: Oct 2000
Chapter/Region: NESIC
Location: CA
Vehicle:
1999 2.5RSt
RBP

Default

definitely clean the IAC it helped my stalling some. I have GFB pully and JUN 14lb flywheel and I can stall the car pretty easily if I am not careful. I am going to put the stock pully back on definitley to help.

Also make sure your grounds are good and you have a quality battery in the car.

but otherwise you are going to have to make sure you help the car find idle. It seems to me that the ECU just catches the transition from decel (decel fuel cut on RS ecus) to idle fueling too late as a result of the revs falling faster with lighter parts.
Hitokiri is offline   Reply With Quote
Old 01-28-2005, 06:24 PM   #17
Brahmzy
Scooby Specialist
 
Member#: 3293
Join Date: Dec 2000
Location: CO
Vehicle:
'14 FXT-T
'15 WRX? '15 STI?

Default

Just take a couple minutes and throw the stock flywheel in.
Brahmzy is offline   Reply With Quote
Old 01-28-2005, 07:12 PM   #18
Uncle Scotty
Scooby Guru
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK Houston
we have an Uncle

Default

Vac/intake leak.... and the exhaust leak....
Uncle Scotty is offline   Reply With Quote
Old 01-28-2005, 07:28 PM   #19
Koua Jones
Scooby Newbie
 
Member#: 3806
Join Date: Jan 2001
Chapter/Region: NWIC
Location: WA
Vehicle:
2010 MX-5 Touring
Silver

Default

I started getting misfire codes after having my exedy clutch/flywheel installed. My car idles low at ~600 rpm but doesn't stall.
Koua Jones is offline   Reply With Quote
Old 01-28-2005, 09:02 PM   #20
mistaboosta
Scooby Newbie
 
Member#: 68722
Join Date: Aug 2004
Default

what is IAC??? is it same as maf? if so i've already cleaned it with pressurized air. hope did the right thing.
mistaboosta is offline   Reply With Quote
Old 01-29-2005, 10:36 AM   #21
quazimoto
Scooby Guru
 
Member#: 70395
Join Date: Sep 2004
Chapter/Region: MAIC
Location: Da-boonies,Va
Default

The IAC(Intake Air Control valve) is located on top of the throttlebody.It is used to control the idle air flow.So basicly it is what controls the cars idle.It comes off pretty easy.Just clean it with some carb cleaner and slap it back on.
quazimoto is offline   Reply With Quote
Old 01-29-2005, 12:13 PM   #22
ride5000
Scooby Guru
 
Member#: 32792
Join Date: Feb 2003
Chapter/Region: NESIC
Location: lincoln, ri
Vehicle:
2003 GGA MBP
12.9 / 105+

Default

you should not clean your MAF sensor with pressurized air. it is a very thin exposed metal wire.

when you remove the IAC, watch the gasket and remove carefully... and DON'T strip the mounting bolts.
ride5000 is offline   Reply With Quote
Old 01-29-2005, 07:43 PM   #23
mistaboosta
Scooby Newbie
 
Member#: 68722
Join Date: Aug 2004
Default

thanks for those advices everyone

you're all great
mistaboosta is offline   Reply With Quote
Old 02-07-2005, 02:13 AM   #24
firedog25
Scooby Specialist
 
Member#: 12570
Join Date: Nov 2001
Location: Land of Dust and Wind
Vehicle:
2002 White WRX
'91 Turbo Miata

Default

Quote:
Originally Posted by dumdum
I'm running the ACt streetlite flywheel(13.9lbs) and a Spec "stage l" clutch kit and cars idles and drives like stock.

I hate to bump old stuff, but I have a Spec Stage 1 and an Exedy flywheel, mine feels nothing like my stocker did. I have to re-learn how to drive it from first gear now.
firedog25 is offline   Reply With Quote
Old 02-08-2005, 04:57 PM   #25
Kingpin
Vendor
 
Member#: 41252
Join Date: Aug 2003
Chapter/Region: SWIC
Location: 602-795-3036
Vehicle:
Twin 2005 600WHP
FormulaD/TimeAttack Sti's

Default

If you guys raise the idle 100-150 rpm with deltadash your problems will go away. Actual idle speed is lower with the light flywheel due to the loss of enertia.

Clark
Kingpin 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
Misfire in Cylinder 1 CEL after Flywheel install?? Scoobs2002 Engine Management & Tuning 19 05-13-2008 09:14 AM
Car stalling out after intake install! Saabzilla Normally Aspirated Powertrain 4 02-17-2006 09:24 PM
Problem after stereo install... please help WRXVII Electrical & Lighting 1 11-20-2003 02:33 PM
Help car making noise! Problem after uppipe install jbogli Factory 2.0L Turbo Powertrain 12 06-20-2003 10:25 AM
problem after alarm installed Evil Imports Electrical & Lighting 1 04-15-2003 09:56 AM


All times are GMT -4. The time now is 10:07 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.