i'd say performance gained using 1.6 clutch from a 1.3L engine aint much... hence, i would suggest u to go for lightened flywheel but maintain using 1.3L clutch...
clutch surface area of grip will only comes into effect when ur engine is producing power which ur 1.3L clutch cannot handle and began to slip... if its not slipping by anyhow u trash it, its useless using bigger clutch...
by lightening the angular momentum of ur rotating crank (this includes crankshaft, flywheel, clutch, crankpulley), ur engine is able to rev up faster... this increases acceleration, but with the downside of losing top speed... because the lower inertia means lower momentum... hence, lower energy stored in ur rotating crank, u will need more power to get it spinning continuously...
yeap... if ur car has catcon, remove it and replace with midbullet... if ur oem exhaust piping has a restrictive midbox, replace it with a freeflow midbullet... (old saga iswara does not have catcon, but it does have a midbox)...
left is s-flow muffler... right is straight flow muffler... as u can see, s-flow is more restrictive compare to straight flow muffler... restrictiveness means good in sound dampening... which means s-flow muffler will emit less noise compare to straight flow muffler.... another tip, auto transmission better use s-flow to hold the backpressure... manual tranny can use either s-flow or straight flow muffler...
if inlet diameter too big, ur exhaust will lose too much backpressure... this is bad for low end torque... hence, for 1.5L NA engine and below, it is best to keep the inlet muffler approx 2.0"... outlet tip mostly for cosmetic purpose... if dont wanna attract too much attention from abang jaypeejay, dont use too big lo....
as for adj campulley, u can adjust the cam timing advance/retard... for SOHC engine, u can adjust the cam timing for better acceleration OR top speed... or in other words, better low end torque or better mid-high rpm power.... or in other words also, shifting the powerband...
if jz change adj campulley for SOHC engine, it has minor performance gain as i said, u only play with the powerband... thats why adj campulley best paired with high profile camshaft... higher profile camshaft gives good mid-high rpm gain, but loose abit of low end torque... but adjusting the cam timing, u can bring the powerband lower so u dont sacrifice too much low end torque and have the powerband at an achievable rev range... no point having the powerband way above 7k rpm when ur engine internals cannot handle it rite??...
