Any difference between ka24de ISIS crank pulley vs ASP crank pulley

[a_ahmed]

Just curious if there is any difference between the two? Quality or otherwise? Anyone run them before?

I know the ASP was dyno'd to make something ridiculous like 10whp across the whole powerband... but other than that are either of them any different?

I THINK the ISIS one is advertised as 'undersized' requiring a smaller belt.... but I am NOT sure about the ASP... someone mind chiming in?

[SoSideways]

Did you just ask about a "knock-off" part?

[a_ahmed]

I honestly don't know what would be 'original' to begin with.

[flip240]

I used to run the ASP, it is undersized and lightened, it definitely helped with faster revving, but it wasn't worth it to me in the end since it isn't a harmonic dampener.

[a_ahmed]

what do you run now?

I dont rev my KA over 5500rpm, no point as the power just falls off.. and ive tested it so many times and i end up going faster straight and otherwise if i simply rev at 5500rpm... until i guess get an n60, get an ecu retune and what have you... Since I'm not going turbo any lil thing I can do to the KA's NA power is win for me... Pretty much all I'm missing is N60 maf, maybe larger injectors (based on what i read from bigvinnie), ecu tune and this... plus ill be getting rid of power steering/ps pulley. I don't think I'd want to even with these things polished out (as bigvinnie how he did it) rev more than 6000rpm ever. Without an ecu tune and a wallbro i ran mega rich but I found my timing was retarded (lol), I set it to 28* and run 94 octane... car pulls so f'en strong... and sounds healthy while before it sounded like it struggled and ran like ****. So far one year plus track days, no problems...

I love how my KA is also revvy with the solid mounts, lightened flywheel/clutch and alum 1piece driveshaft... if this adds a healthy 10whp (as on the dynos) throughout the powerband AND makes the ka more revvy... = win... ECU tunes from what I've seen of people with standalones have netted a healthy 15-25whp... that's sick... if I can get 190whp and keep it from blowing lol.. I'm a happy camper until I go v8... I love NA power... and response...

[djsilver]

I can't find any info about ISIS pulleys but I'll tell you about my ASP crank pulley.

Measurements are approximate;
OEM=5.875"/149mm diameter and 18.5"/ 468mmm circumference.
ASP= 5.25"/ 133.5mm diameter and 16.5"/ 420mm circumference.

That works out to about 10% underdrive for the ASP pulley. Oh yes, the OEM pulley is just a pulley, not a harmonic dampener....,

If you want a harmonic dampener you can get one from ATI or BHJdyanamics

http://www.atiracing.com/products/dampers/index.htm

http://www.bhjdynamics.com/index.php?main_page=index&cPath=10&zenid=r3qjvj9bgpogldt1dqua8eak90

[Def]

The stock crank pulley is indeed a harmonic damper. (It's not a dampener, nothing is getting wet ).

The outer section bonded to the inner section with a piece of rubber acts just like a mass suspended by a spring, except aimed at countering torsional(twisting) vibrations in the crank.

I've posted this a million times on forums, but I guess this is such a non-intuitive concept people need to see something to believe it. The middle one is what the stock crank pulley does at the natural frequency of the crank(i.e. where it naturally wants to vibrate like a tuning fork).

[djsilver]

We'll, you said I was all wet so it must apply here somewhere! The GIF you posted won't display but I found it here;

http://paws.kettering.edu/~drussell/Demos/absorber/DynamicAbsorber.html

[KA240SX808]

I see the BJD Damper has a 6.26" OD, so it's also an Overdrive Pulley (~7%)?

[a_ahmed]

Stupid question but if the ASP and ISIS are 10% underdriven... what sort of belt would one get? 10% smaller (lol I don't know...) Pardon my ignorance *blush*

I am trying to get sohc upper and lower brackets and thermostat housing in order to get rid of the power steering pulley. Supposedly I'll need a 35" 3 rib belt for that... but if i also get this pulley then how does that 10% apply?

[Colorado S14]

I have the ASP and it does indeed help the motor rev out a bit quicker, and as you mention can add a few ponies. The ASP on the KADE underdrives the PS and the alternator by 15% and does require new belts. From their site:
INSTALL NEW GATES BELT (OR EQUIVALENT) FOR PART NO. 331070:
ALTERNATOR BELT: K040292
PS/WP BELT: K030455
A/C BELT: RETAINS STOCK BELT

I have been very torn recently on continuing to run it or going back to stock. Everyone talks about the risks of not running a dampened pulley but I have yet to see a problem in the KA. I also just saw this thread on MotoIQ and some pretty smart guys gave their opinion on the topic:MotoIQ Thread

[a_ahmed]

hmmm so what length is the stock belt? For the setup with stock crank pulley its a 35" 3 rib belt i would need.... whats the stock one WITH PS?

So I can kind of guess what would fit... since ifi ts 10-15% less then... i need to calculate what other belt options i have u know what i mean

[Def]

I have been very torn recently on continuing to run it or going back to stock. Everyone talks about the risks of not running a dampened pulley but I have yet to see a problem in the KA. I also just saw this thread on MotoIQ and some pretty smart guys gave their opinion on the topic:MotoIQ Thread

Honestly, I think a lot of it has to do with the specific engine you're using and how often you're at WOT as you pass through that RPM range where the torsional vibrations peak. Some engines like the S52 (3.2L US spec E36 M3 engine) have a torsional vibration peak at 3600 RPM. You can EASILY hear the engine "ringing" if you put a solid crankshaft pulley on the car. But then again, out on track it wasn't that common to sweep past 3600 RPM, or stay around there in a corner for long periods of time so some guys were perfectly fine running them on track. Some guys on the street had their oil pump nut(that drives the gear/chain for the oil pump) spin off as they sit at 3600 RPM for a long period of time cruising etc.

Mike Kojima is a nice guy, but he's using some incorrect terminology in the thread you linked... Actually everybody trying to talk technically in that thread is using incorrect terms or just doesn't understand that there are multiple bending modes at different frequencies. Most are probably outside the RPM range the crank operates in, so they are of no concern. Yet some are deemed to cause increased wear, and that's the frequency the stock harmonic damper(dynamic vibrational absorber) is tuned to damp. It has *NOTHING* to do with balancing the engine, nothing at all.

I think it's just one of those things that's very usage dependent. You might be fine, you might not be. In fact, you might have the torsional vibrations in your usual RPM range DECREASE by putting on a solid crank pulley, since adding a dynamic vibration absorber makes one very large amplitutde peak turn into two smaller peaks to either side of the original(frequency wise). But by deleting it, there is no question that you will now have at least one RPM where you get greatly increased torsional vibrations, and you could possibly get other natural frequency modes such as single mode or double mode bending.

[Matt93SE]

I've run an ASP pulley on my DE for years. no issues *yet*, but I have started noticing some oil seepage on the front of the block. I don't know if it's related to the pulley or just the fact the engine is 130k miles old and I shift at 6800rpm on every straight.

[Def]

I've run an ASP pulley on my DE for years. no issues *yet*, but I have started noticing some oil seepage on the front of the block. I don't know if it's related to the pulley or just the fact the engine is 130k miles old and I shift at 6800rpm on every straight.

If you weren't granny shifting, not double clutching like you should then it wouldn't be a problem.