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Old 09-26-2007, 05:22 PM   #1
SAIKOU
Scooby Newbie
 
Member#: 92718
Join Date: Aug 2005
Chapter/Region: Tri-State
Location: Jersey
Vehicle:
04 WRX 2.5 Hybrid
Aspen White

Default 2.5 Hybrid, lightened or stock flywheel?

Thoughts on using a wrx ACT lightened flywheel (13.5lbs) over the stock wrx one (something like 30lbs) with my hybrid 2.5 build. My tuner/builder recommended going back to the stock one, but there was a noticeable diff in revs, acceleration, and 1/4 track time (slower launch but a couple mph faster) when 2.0L

My build:

New STI shortblock w/ JE forged 2618 pistons
reconditioned WRX heads, stock cams
FP green 3"in, 7cm hot
catless uppipe, 2.5" tbe
UTEC
EBAY Huge TMIC
ACT street/strip clutch kit (has springs)
and supporting mods

Pros/cons plz. some ppl say more engine vibration b/c less mass, others say less vibration. i dunno which.
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Old 09-27-2007, 12:17 AM   #2
wrxed04
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Member#: 67115
Join Date: Jul 2004
Chapter/Region: Tri-State
Location: New Jersey
Vehicle:
2005 STi
OBP

Default hybrid question

By any chance did you get the hybrid done by Precision tuning? I'm considering towing mine in for an engine and they reccommended a hybrid setup. What did you pay for the engine setup? Any more details/recommendations? Reliability is my most important concern, but a little HP boost would be nice. I'm not familiar with the FP turbo. Why UTEC and not AP?
Thanks for any advice, Steve

Last edited by wrxed04; 09-27-2007 at 12:53 AM.
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Old 09-27-2007, 04:02 PM   #3
ovedrivex
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Member#: 116774
Join Date: Jun 2006
Chapter/Region: TXIC
Location: Tropioca.com
Vehicle:
1997 Project GC8

Default

13.5 isnt too bad but your rpms drop quicker, but rev's faster.
so spirited driving = fun
slow/city driving = not so fun, but very bearable
traffic = hella sux id rather get out my car and walk to where im going.
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Old 09-28-2007, 11:48 AM   #4
Le Saboteur
Scooby Specialist
 
Member#: 142244
Join Date: Mar 2007
Chapter/Region: MAIC
Location: baltimore
Vehicle:
2007 SWP STi
WFC #243

Default

stick with the stockerr
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Old 09-28-2007, 01:46 PM   #5
jblaine
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Member#: 8512
Join Date: Jul 2001
Chapter/Region: South East
Location: St. Pete, FL
Vehicle:
2002 WRX chassis...
stage-infinity.com

Default

I've been waiting 6 years for someone to make a 17lb flywheel.
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Old 09-28-2007, 05:48 PM   #6
SubaruCO
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Member#: 33566
Join Date: Mar 2003
Chapter/Region: International
Location: Aberdeen, Scotland
Default

^^ - I hear you there. When it comes time to replace the flywheel during a normal clutch job I'd like to have a "reasonable" option. It's either stock or pain in the ass light.
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Old 10-24-2007, 05:09 PM   #7
SAIKOU
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Member#: 92718
Join Date: Aug 2005
Chapter/Region: Tri-State
Location: Jersey
Vehicle:
04 WRX 2.5 Hybrid
Aspen White

Default

i used the ACT 13.5lb flywheel w/ my 2.5 hybrid and act clutch and love it. it was a pain in the arse w/ 2.0 but 2.5 torque got rid of that. I'd def recommend it to anyone
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