Quote:
Originally Posted by glamcem
because I need to be able to blip the throttle for rev matching since it's a safety issue at track, I locked up my rear tires and spun out at 90 mph  no phun!! .. since with SC parasitic load/loss comes in play which ultimately slows the engine revving I have to find a way to compensate that..
the only alternatives seem like lighter crank pulley and/or lighter flywheel at the moment..I also ordered some Cusco Accelerator pedal but it will maybe a help a bit but I don't expect by much..
AFAIK, FA20 engine doesn't use harmonic balancers is that what you mean in your first paragraph? |
harmonic balancer is a misnomer....the proper term is harmonic damper. all factory crank pulleys are harmonic dampers. going to a non-dampened lightweight aluminum pulley is a step backwards...a step forward would be an ATI damper or maybe have one custom made by BHJ.
here is a link to the ATI product:
http://www.atiracing.com/products/da...dam-subaru.htm
Here is a link to BHJ and also technical whitepapers about the importance of Harmonic Dampers:
http://www.bhjdynamics.com/index.php...vrsueignutk6u3
as for locking up and spinning out...dont dump the clutch. aside from that if you are trying to make the engine 'blip' faster, the crank pulley is the wrong place to look for that response. as was said before, start in the areas with the highest MOI (moment of inertia)..the crank pulley does not have enough mass or diameter to significantly impact the rate the engine spins up or spins down.....start at the flywheel and clutch package. an ideal set-up for you would be an ultralight flywheel combined with a 7" twin-disc carbon clutch (which you can feather and ride/slip all you want if you need to)...if the clutch isnt in the budget, even the flywheel alone will make a significant difference.