Pros and Cons of a light weight flywheel. - Page 2

will12345 · 08-30-2007, 10:24 PM

sti's usually dont throw a misfire code with a light flywheel unless you have an issue with your management or just something wrong with your motor

mxpop · 08-30-2007, 10:33 PM

I was told that even a lightweight pulley can throw codes or make erratic issues, esp at low RPMs.

Any truth?

**elirentz** · 08-31-2007, 12:10 PM

I thought that mine was causing a misfire, but come to find out it was just a bad injector. From what I've read sti's don't have problems with lighter flywheels.

double down · 09-01-2007, 05:39 PM

I put a hundred plus miles on my STI with the new clutch/ light weight fly wheel set up today. I stalled the car on the first try, not so much because of the fly wheel but because the clutch pedal engages an inch off the floor! The new clutch is pretty grabby . The car pulls much harder than it used to with the stock weight flywheel . I.m very happy with the end result.

mxpop · 09-01-2007, 09:27 PM

DD,

what clutch did you get?

double down · 09-02-2007, 04:16 AM

mxpop my bad its an ACT clutch and I dont know what flywheel they used.Its half the weight of the stocker thats all I know.

mxpop · 09-02-2007, 09:14 AM

I just had my motor out last week and was gonna put an ACT clutch in at the same time. I didnt cause the stock clutch was still over 50% and I only roadrace, no launches for me, so I saved the $.

My tuner did suggest the ACT clutch if I did one and he said that its a little stiffer but otherwise the same as stock. I think he was intending to reuse my stock pressure plate so if yours is lighter, that's prob what is making the most difficulty driving it.

As for your diff engagement point, I wonder if flushing the clutch fluid would help with that?

pooster.online · 09-08-2007, 11:03 AM

Quote:

On the other hand, the car pulls noticably harder in the lower gears.

I had an ACT clutch and gruppe-s flywheel installed last thursday and I feel like I have lost some torque in the car.. Does anyone else feel this way? I might get up to 100 mph faster than I used to, but I jsut don't feel the pull of the stg 2 I felt before? Is it all in my head? BTW.. the chatter and whine is kinda annoying... I almost wish I had resurfaced the stock one..

jays05 · 09-08-2007, 11:24 AM

My STI never threw a misfire code with a lightweight flywheel (ACT Prolite).

***Neanderthal Racing*** · 09-08-2007, 12:10 PM

Quote:

Originally Posted by pooster.online

I had an ACT clutch and gruppe-s flywheel installed last thursday and I feel like I have lost some torque in the car.. Does anyone else feel this way? I might get up to 100 mph faster than I used to, but I jsut don't feel the pull of the stg 2 I felt before? Is it all in my head?

it is not in your head. it is the predictable effect of losing the rotational mass of the oem fw.

pooster.online · 09-10-2007, 11:08 PM

also discovered I don't hit max boost of 20 psi like I used to with the stock flywheel. man... lightweight flywheel sucks.

V8Huntr · 09-11-2007, 07:45 AM

From my understanding, putting a lighter flywheel on throws off the balance of your rotating mass and lessens the life of the engine. Has anyone else heard of that?

**Z1 Performance** · 09-11-2007, 08:13 AM

Quote:

Originally Posted by V8Huntr

From my understanding, putting a lighter flywheel on throws off the balance of your rotating mass and lessens the life of the engine. Has anyone else heard of that?

only if Helen Keller made the aftermarket flywheel - the ACT ones are balanced even better than the stock one is

AnorexicSTI · 09-11-2007, 10:01 PM

Quote:

Originally Posted by pooster.online

also discovered I don't hit max boost of 20 psi like I used to with the stock flywheel. man... lightweight flywheel sucks.

What boost are u hitting then? And is this even after a retune? In all gears?

rasheedn · 09-12-2007, 10:30 AM

i didnt notice much difference after installing ACT prolite

what i did notice is that i need to rev to 5500 now to launch the car otherwise it just bogggs down

even with LC !!

08-30-2007, 10:24 PM	#16
will12345 STI Driver Car: 04 subaru sti Fav Mod: 35r turbo kit Location: sunny san diego Posts: 294 Join Date: Apr 2007 Trader Rating: (1)	Re: Pros and Cons of a light weight flywheel. sti's usually dont throw a misfire code with a light flywheel unless you have an issue with your management or just something wrong with your motor This ad is not endorsed by this member. Please register or login to hide this ad.

08-30-2007, 10:33 PM	#17
mxpop Spec C Club Car: '06 STI Fav Mod: air freshener!!! Location: Santa barbara area Posts: 2,289 Join Date: Jan 2006 Trader Rating: (2)	Re: Pros and Cons of a light weight flywheel. I was told that even a lightweight pulley can throw codes or make erratic issues, esp at low RPMs. Any truth?

08-31-2007, 12:10 PM	#18
elirentz Gold Member Car: 05 STi, 99 2.5rs Fav Mod: ohlins w/RCE springs, sz55 Location: charleston Posts: 424 Join Date: Nov 2005 Trader Rating: (1)	Re: Pros and Cons of a light weight flywheel. I thought that mine was causing a misfire, but come to find out it was just a bad injector. From what I've read sti's don't have problems with lighter flywheels.

09-01-2007, 05:39 PM	#19
double down Amateur STI Driver Car: silver 05 STI Location: CT. Posts: 8 Join Date: Aug 2007 Trader Rating: (0)	Re: Pros and Cons of a light weight flywheel. I put a hundred plus miles on my STI with the new clutch/ light weight fly wheel set up today. I stalled the car on the first try, not so much because of the fly wheel but because the clutch pedal engages an inch off the floor! The new clutch is pretty grabby . The car pulls much harder than it used to with the stock weight flywheel . I.m very happy with the end result.

09-01-2007, 09:27 PM	#20
mxpop Spec C Club Car: '06 STI Fav Mod: air freshener!!! Location: Santa barbara area Posts: 2,289 Join Date: Jan 2006 Trader Rating: (2)	Re: Pros and Cons of a light weight flywheel. DD, what clutch did you get?

09-02-2007, 04:16 AM	#21
double down Amateur STI Driver Car: silver 05 STI Location: CT. Posts: 8 Join Date: Aug 2007 Trader Rating: (0)	Re: Pros and Cons of a light weight flywheel. mxpop my bad its an ACT clutch and I dont know what flywheel they used.Its half the weight of the stocker thats all I know.

09-02-2007, 09:14 AM	#22
mxpop Spec C Club Car: '06 STI Fav Mod: air freshener!!! Location: Santa barbara area Posts: 2,289 Join Date: Jan 2006 Trader Rating: (2)	Re: Pros and Cons of a light weight flywheel. I just had my motor out last week and was gonna put an ACT clutch in at the same time. I didnt cause the stock clutch was still over 50% and I only roadrace, no launches for me, so I saved the $. My tuner did suggest the ACT clutch if I did one and he said that its a little stiffer but otherwise the same as stock. I think he was intending to reuse my stock pressure plate so if yours is lighter, that's prob what is making the most difficulty driving it. As for your diff engagement point, I wonder if flushing the clutch fluid would help with that?

09-08-2007, 11:24 AM	#24
jays05 Spec C Club Fav Mod: when it's not blown up Location: Upstate NY Posts: 1,482 Join Date: Nov 2004 Trader Rating: (0)	Re: Pros and Cons of a light weight flywheel. My STI never threw a misfire code with a lightweight flywheel (ACT Prolite).

09-10-2007, 11:08 PM	#26
pooster.online Amateur STI Driver Posts: 41 Join Date: Jul 2006 Trader Rating: (0)	Re: Pros and Cons of a light weight flywheel. also discovered I don't hit max boost of 20 psi like I used to with the stock flywheel. man... lightweight flywheel sucks.

09-11-2007, 07:45 AM	#27
V8Huntr Spec C Club Car: 04' WRB STi Fav Mod: TBE Location: Allentown, PA Posts: 1,515 Join Date: Sep 2006 Trader Rating: (0)	Re: Pros and Cons of a light weight flywheel. From my understanding, putting a lighter flywheel on throws off the balance of your rotating mass and lessens the life of the engine. Has anyone else heard of that?

09-12-2007, 10:30 AM	#30
rasheedn Junior STI Driver Car: 04 STi Fav Mod: remap Location: Jerusalem Posts: 104 Join Date: Apr 2007 Trader Rating: (0)	Re: Pros and Cons of a light weight flywheel. i didnt notice much difference after installing ACT prolite what i did notice is that i need to rev to 5500 now to launch the car otherwise it just bogggs down even with LC !! This ad is not endorsed by this member. Please register or login to hide this ad.