Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

A friend tested a light flywheel and a stock flywheel on the exact same setup (2g eclipse with a TD06) .
With the light flywheel it does spool up faster(not by TOO much) and rev way faster to redline once it started to spool.

Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

Lightweight flywheels make the engine work less to cause the same number of revolutions.

It's kinda like running small ports on a turbo-manifold. Smaller diameter tubing will decrease spool time (increasing velocity), but cause more backpressure in the system, correct? You'll probably spool the turbo faster, but overall your car won't be any faster as you're wasting energy?

Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

smaller ports (to an extent, you dont want them TOO small) will increase exhaust gas velocity and increase turbo spool. Kinda how if you port out the exhast ports in a cyl head too much, youll end up with a lag monster t25

Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

heavy fly will get you to achieve maximum boost pressure lower down the rev range

Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

Don't most lightweight pulleys no longer act as a harmonic balancer wich will screw you motor up?

Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

if your engine is built isnt it no longer internally balanced anyways??

Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

It all depends on the build, if you use a stock honda crank and pulley you will be balanced, if you use some no name crank, some half assed crank pulley made on a lathe in pakistan by a guy who makes $0.50/hour then offcourse you wont have a ballanced engine.

A flywheel has nothing to do with harmonics, because that is what the pulley is for.

Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

i think hes talkign about the weight of the piston and the rod in a built engine.

Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

a properly built engine is weight balanced meaning all rotating parts are matched winthin grams of each other ie. rods caps are weight matched,rods,pistons,,even bearing weight is taken into consideration. an unbalance motor will not run smooth or long for that matter.then the crank is balanced by adding or removing weight from the crank lobes to acheive a neutral balance. HONDAS ARE INTERALLY BALANCED. the flywheel has nothing to do with harmonically balancing the rotating assembly

:6

Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

I agree, the flywheel, nor the pulley has nothing to do w/ balance either. The pulley is just that, a pulley, not a harmonic balancer. This is not a V8. There is no fluid damper on hondas. I see why cheapo underdrive pulleys that do not spin true can impact the bearings, but a quality one that is properly machined, and balanced to zero, will not blow your oil pump, or spin a bearing. Now, with that said, I do believe ATI or Fluidamper makes a real silicon filled harmonic balancer for Hondas. I dont know why, but Id assume that it is for the retarded high spinning race motors (10k rpm?), but I dunno. Some one elaborate on this?? Main point, an underdrive WILL NOT kill your bearings/ oil pump, as long as it is not a chepo pulley. (as far as Ive seen)

Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

agreed i think a well made lw crank pulley will not hurt for example who ever heard of a CTR N1 pulley causing oil pump or bearing failure??! it weighs nothing. the fluidamper is made for high rpm motors or motors that put out way more tq and hp then stock was ever intended for. i imagine it would lessen vibrations on the crank and rotating assembly?

Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

The CTR N1 pulley has smashed many a bearing and oil pump.They have no harmonic balancer/rubber thing in it.I have one sitting here and Im scared to use it but i only run a alternator so i want a single groove pulley :-\

Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

lol don't speak without experience. many honda pulleys have no rubber, crx hf,civic base models, any honda with no a/c and just an alt or p/s to run have all steel pulleys with no rubber inside or out. cut it open . besides you make no sense you even just admitted its sitting there but you never used it so how would you know? and you said you need a single groove pulley............HELLO the N1 is a single groove for alt. only :S

Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

That rubber band in the pulley isn't a balancer it's a dampener, to stop crank flex.

Re: What spools a turbo faster: Light flywheel or Heavy flywheel
 

crank flex? explain...

Id have to think that the rubber is there to isolate the accesories, not to stop "crank flex" but im just guessing. Isnt crank flex when your crank internally is flexing between the bearing caps from the torque load (i.e. not a good thing...only occurs in high HP cars...isnt that why 4 bolt mains are better than 2 bolt?). I dunno, anyone else know what crank flex is, maybe explain this?

If your scared to use it, whyd you buy it? Also, why do you want to get a single groove pulley if you think the multiple belt one is going to ---- your bearings up, why spend the money on a single groove thats potentially just as bad? ::)

Id like to see the damage these pulleys supposedly inflict on bearings/pumps. I want pics or vids, I have only heard this "underdrive pulleys blow your engine" stuff online. Ive never seen it in person, heard about it hapening to anyone, or even seen pics of it. Im curious to see what happens, plus carnage pics always rock! :y