Has anyone install a light weight flywheel?

[20valvewynn83]

Just asking if other members of this forum have installed a light weight flywheel and if so what are your thoughts. I am installing my flywheel on Tuesday and want to know what to expect out of this mod. I will be using factory clutch.

http://www.evolution-industries.com/dyn2.aspx

[CSG David]

The CSG BRZ doesn't have a lightweight flywheel yet. However, on my personal S2000, I have the Exedy OE Replacement clutch kit and a Toda flywheel. The stock AP2 flywheel is 22lbs and the Toda flywheel is 8.4lbs. You will expect to have better engine response when you rev match and the engine will sound a little livelier. It is an overall better driving experience.

[MTCRX]

I haven't put one on these cars, so I don't know the level of difficulty. But I did put one on a 1.5L Honda engine and love it. The engine revs so much faster and easier, it really took a lot of the response lag out of the engine. The car became much quicker at autocross. I put a heavier duty clutch and pressure plate in while I was there since it does take time to get everything apart. Dissasembly of pieces to get at the transmission and clutch are the biggest time sinks in the project. Make sure you remember where everything goes to reassemble it.

Let us know how it goes, what you encounter along the way, and how it behaves later.

[20valvewynn83]

Originally Posted by CSG David

The CSG BRZ doesn't have a lightweight flywheel yet. However, on my personal S2000, I have the Exedy OE Replacement clutch kit and a Toda flywheel. The stock AP2 flywheel is 22lbs and the Toda flywheel is 8.4lbs. You will expect to have better engine response when you rev match and the engine will sound a little livelier. It is an overall better driving experience.

Yeah I grasp the concept but I guess I'm looking to see how the FRS takes the flywheel. I understand the revs come quick but during daily driving how is it

[20valvewynn83]

Originally Posted by MTCRX

I haven't put one on these cars, so I don't know the level of difficulty. But I did put one on a 1.5L Honda engine and love it. The engine revs so much faster and easier, it really took a lot of the response lag out of the engine. The car became much quicker at autocross. I put a heavier duty clutch and pressure plate in while I was there since it does take time to get everything apart. Dissasembly of pieces to get at the transmission and clutch are the biggest time sinks in the project. Make sure you remember where everything goes to reassemble it.

Let us know how it goes, what you encounter along the way, and how it behaves later.

I'm sure I will remember how it all goes back as I do work for Toyota as a tech. It should only take a few hours to complete. I will give an update on Tuesday if all goes well

[wparsons]

I've heard some Subaru's don't idle properly, and can throw codes if the mass is reduced too much.

[20valvewynn83]

Originally Posted by wparsons

I've heard some Subaru's don't idle properly, and can throw codes if the mass is reduced too much.

Interesting do you remember where you found this info. I would like to know weights

[Gixxersixxerman]

Originally Posted by wparsons

I've heard some Subaru's don't idle properly, and can throw codes if the mass is reduced too much.

I'm trying for a search.. I read the same with a fly wheel and pulley it was throwing codes.. I'll see if I can find the info.. I am pretty sure it was a isolated case.. But don't remember much of it

[20valvewynn83]

Nobody has this mod yet (on an FRS)

[Ranatsu]

Originally Posted by Gixxersixxerman

I'm trying for a search.. I read the same with a fly wheel and pulley it was throwing codes.. I'll see if I can find the info.. I am pretty sure it was a isolated case.. But don't remember much of it

That was a problem that happened with the 02-05 WRX.. When you combined the LW pulley with the LW flywheel.. the car would rev so fast and engine speed would drop so rapidly that the ecu thought the car was misfiring and thus it would pull timing and freak out.

It was a fairly rare occurrence.

[20valvewynn83]

Originally Posted by Ranatsu

That was a problem that happened with the 02-05 WRX.. When you combined the LW pulley with the LW flywheel.. the car would rev so fast and engine speed would drop so rapidly that the ecu thought the car was misfiring and thus it would pull timing and freak out.

It was a fairly rare occurrence.

Was this only happening with an extremely light flywheel or it didn't matter?

[Ranatsu]

Originally Posted by 20valvewynn83

Was this only happening with an extremely light flywheel or it didn't matter?

Usually the lightest flywheels on the WRX I think were less than 10 lbs, combined with a ~1 lbs crank pulley..

I personally knew people who ran that setup and never had the issue.. It was pretty rare, but as you know only the people with problems say anything. Not the hundreds that don't have problems.

I've never heard of anyone with a newer Subaru on the 32 bit ecu or canbus ecu have any such problem.

I would do it and not look back if it were me. In fact eventually I will have the lightened crank, lightened flywheel, and carbon fiber driveshaft.

[20valvewynn83]

Originally Posted by Ranatsu

Usually the lightest flywheels on the WRX I think were less than 10 lbs, combined with a ~1 lbs crank pulley..

I personally knew people who ran that setup and never had the issue.. It was pretty rare, but as you know only the people with problems say anything. Not the hundreds that don't have problems.

I've never heard of anyone with a newer Subaru on the 32 bit ecu or canbus ecu have any such problem.

I would do it and not look back if it were me. In fact eventually I will have the lightened crank, lightened flywheel, and carbon fiber driveshaft.

Damn 10lbs is too light for me I think my flywheel is about 12-16lbs. I have the crank pulley so I'm sure my revs will go quick enough and like you said I'm sure I will have a lighten driveshaft as well. Now you got me thinking I will get a check engine light but its all good ill just have to save up for a tune

[Ranatsu]

Originally Posted by 20valvewynn83

Damn 10lbs is too light for me I think my flywheel is about 12-16lbs. I have the crank pulley so I'm sure my revs will go quick enough and like you said I'm sure I will have a lighten driveshaft as well. Now you got me thinking I will get a check engine light but its all good ill just have to save up for a tune

I doubt you will get a cel from it.. Like i said it was very rare. I wouldn't worry about it at all.