DodgyTim
11-22-2013, 02:00 PM
I’m looking at purchasing a lighter flywheel for my 818R.
My donor is a 2006 WRX with the EJ255
Standard flywheel weight seems to be 25lbs for the WRX and 18.9lbs for the STI?
A quick search online I found “lightweight” flywheels as light as 8.6lb, with common weights about 12 to 14 lb.
Also found some posts on NASIOC;
“I have a 06 WRX and just installed an F1 Racing, 13.7 lbs flywheel and a Clutch Masters FX200 today. The RPMs don't fall that fast, maybe just a slight hesitation of letting off the gas while shifting, but nothing that a week or two of driving won’t get you used to. I was also surprised to see no change at idle. The needle is as steady as it ever was. The car definitely pulls quicker and you barely have to touch the gas to keep it at 80 on the highway. I was surprised that the FX200 felt really light and gummy compared to the stocker being that it’s a Stage 2 clutch. It feels all right though and grips like a b*stard too I did upgrade my clutch line to steel braided so that could have something to do with the feel also.
The flywheel didn't throw any codes but it did misfire and stall today while casually driving down a residential street. After a rough re start and some bucking as I was getting going I was surprised to see absolutely no code at all? I have an appt to get a tune on Monday so hopefully it was just a learning process for the car and won't happen again. It drove fine after that.
I know you were looking for a STi but this is what I got. I know mine hits boost and spools even faster now than it did before, launch is significantly "touchier" but by no means have to rev to 1000s of rpms just to get it going, and you'll get put back in the seat noticeably further ha-ha. One last thing is it does feel like the top speed may have gotten decreased but I won't try that till after the tune. I can't comment on top end because I haven't taken it over 3500 yet. Hope this helps a little.”
and
“I fitted a 5kg aluminium flywheel to an '03 STi motor in my dd. The snappy acceleration and on-off nature of the motor is just plain fun. But not plain sailing. I've never seen a CEL but the first thing I got was a heap of shuddering on take-off and sometimes full on kangaroo hopping which was very hard to avoid. The only solution was to take off in a rush all the time. Might sound like fun, but gets a bit tedious for the favourite passenger!
I spoke to the clutch people about this and they said it is a common problem in efi vehicles, many people pull them out after a while as they can't live with it. Despite that it appears for all the world as if there is a gummy clutch plate issue or the like he said it will be fixed by adjusting the tune. He was right. Easy if you've got a Vipec or similar of course, as I do. The fix was to put a heap more fuel into the cells that the engine should never get to, like 500rpm. Totally eliminated the problem and I didn't see shuddering at all in any gentle take-off, much to the delight of the chick when the car was full of shopping.
So now I can just enjoy the boost the seat of the pants dyno gets with the snappier acceleration. But my advice would only be to do a lightened flywheel if you are able to adjust your tune or happy to take it to someone that will.
Fidanza Aluminium flywheel LAF8006 (5kg)
RPM2133SSCC Stage 2 Clutch, pressure plate, throwout brg & spigot brg.”
My questions are;
Does anyone have a light flywheel in their donor or DD?
What weight is it?
How liveable (is that a word?) would it be for 50/50 DD/track use?
Any thoughts on what will be the effect of the much lighter 818 R or S, can we go lighter than the equivalent flywheel in a WRX due to the 818’s weight reduction?
Cheers
Tim
My donor is a 2006 WRX with the EJ255
Standard flywheel weight seems to be 25lbs for the WRX and 18.9lbs for the STI?
A quick search online I found “lightweight” flywheels as light as 8.6lb, with common weights about 12 to 14 lb.
Also found some posts on NASIOC;
“I have a 06 WRX and just installed an F1 Racing, 13.7 lbs flywheel and a Clutch Masters FX200 today. The RPMs don't fall that fast, maybe just a slight hesitation of letting off the gas while shifting, but nothing that a week or two of driving won’t get you used to. I was also surprised to see no change at idle. The needle is as steady as it ever was. The car definitely pulls quicker and you barely have to touch the gas to keep it at 80 on the highway. I was surprised that the FX200 felt really light and gummy compared to the stocker being that it’s a Stage 2 clutch. It feels all right though and grips like a b*stard too I did upgrade my clutch line to steel braided so that could have something to do with the feel also.
The flywheel didn't throw any codes but it did misfire and stall today while casually driving down a residential street. After a rough re start and some bucking as I was getting going I was surprised to see absolutely no code at all? I have an appt to get a tune on Monday so hopefully it was just a learning process for the car and won't happen again. It drove fine after that.
I know you were looking for a STi but this is what I got. I know mine hits boost and spools even faster now than it did before, launch is significantly "touchier" but by no means have to rev to 1000s of rpms just to get it going, and you'll get put back in the seat noticeably further ha-ha. One last thing is it does feel like the top speed may have gotten decreased but I won't try that till after the tune. I can't comment on top end because I haven't taken it over 3500 yet. Hope this helps a little.”
and
“I fitted a 5kg aluminium flywheel to an '03 STi motor in my dd. The snappy acceleration and on-off nature of the motor is just plain fun. But not plain sailing. I've never seen a CEL but the first thing I got was a heap of shuddering on take-off and sometimes full on kangaroo hopping which was very hard to avoid. The only solution was to take off in a rush all the time. Might sound like fun, but gets a bit tedious for the favourite passenger!
I spoke to the clutch people about this and they said it is a common problem in efi vehicles, many people pull them out after a while as they can't live with it. Despite that it appears for all the world as if there is a gummy clutch plate issue or the like he said it will be fixed by adjusting the tune. He was right. Easy if you've got a Vipec or similar of course, as I do. The fix was to put a heap more fuel into the cells that the engine should never get to, like 500rpm. Totally eliminated the problem and I didn't see shuddering at all in any gentle take-off, much to the delight of the chick when the car was full of shopping.
So now I can just enjoy the boost the seat of the pants dyno gets with the snappier acceleration. But my advice would only be to do a lightened flywheel if you are able to adjust your tune or happy to take it to someone that will.
Fidanza Aluminium flywheel LAF8006 (5kg)
RPM2133SSCC Stage 2 Clutch, pressure plate, throwout brg & spigot brg.”
My questions are;
Does anyone have a light flywheel in their donor or DD?
What weight is it?
How liveable (is that a word?) would it be for 50/50 DD/track use?
Any thoughts on what will be the effect of the much lighter 818 R or S, can we go lighter than the equivalent flywheel in a WRX due to the 818’s weight reduction?
Cheers
Tim