Msulic01

Hey guys,

I am debating on doing a crank pulley, after searching the forums its seems people say stay away while others have said make sure it is pinned and reputable install. Planning on grabbing a belt wrap kit along with new S/C pulley (debating on 84/77). Currently have headers no cats, S/C pulley (haven't measured guessing 84 based on eyeball view), 1 stage colder plugs, upper HE.

Anyone on here that has been running a crank pulley for awhile? And what is the best recommended size for my current set up. Any feedback appreciated. Planning on going through Raceiq.

VictoryRoadPerformance

Skip the crank, you can run a 76 clutched with your mods with no issue. Crank is much more risky than the SC pulley. infact we have had 0 SC pulley failures since we started manufacturing them with heavy duty springs, while with the crank pulleys you can read a number of posts with them having issues even when installed correctly. (dont forget to replace the crank bolt if you decide to go with one)

You could also go to the 74mm fixed if you wanted to dump the clutch, but anything beyond that (72 or 70) youd want an ice tank and meth. Shoot us a PM and we will send you a coupon code for a pulley/tune combo of your choice.

shardul

iTrader: (1)

77mm and stock lower
83mm and 168mm lower

Crank pulleys will generate more torque

Tavs

Is the crank pulley generating more torque a dyno confirmed issue? Any science as to why?

MACEDON

Crank pulleys are typically lighter than the stock (ASP ones anyway)

You would get more grip out of it on the belt, the rest I'm not so sure how it would generate more torque

Hulk

I like that crank better
the only reason why some vendors push a sc pulley is because they are afraid the buyer will not install it properly and will destroy the crank on these cars. If you have a qualified person that has done many crank pulley installs in these cars go with the crank pulley

Tavs

I can defiantly see the angle with more grip on the belt. Lighter weight vs the stock crank pulley would be a plus for sure.

Personally I am no stranger to the product, I may have only just purchased a E55 a couple months ago but I remember doing PDI's on them when they were new. (A lifetime ago by the way)

My only question would be, 180/90 vs 154/77. Both show 14.0 psi on the random chart I just looked at. All other things equal, will they dyno the same?

StarvingArtist

The rubber in your stock crank pulley has got to be getting near the end of it's life. Anybody know more about that? How long can the stock harmonic balancer run under this load?

shardul

iTrader: (1)

1 hr, 1 day, 1 year you cannot tell. Sometimes the rubber will not laminate

This is what happens when someone takes a used stock crank pulley to turn it into a bigger one. Off lately I don't accept any used unit to turn into a bigger crank pulley

Hulk

Shards is doing the right thing on the crank pulley

Msulic01

Hulk

Yes sir

VictoryRoadPerformance

You'e not gaining anything with a crank pulley. And I would Definitely not reccomend the adjustable ones. (Very high failure rate even with a pin kit, when they do fail the installation will be blamed, seen it before)

We also sell the remanufactured New OEM core crank pulleys. But I would still reccomend a SC pulley over crank all day long.

install is 30 minutes
same power
lower price
less risk

hell, you could do a brand new OEM crank pulley with an upgraded SC for the same price.

VictoryRoadPerformance

Something that hasn't been mentioned also Is that most of the oversized crank pulleys have steel rings. They are not lighter than factory crank pulleys although someone mentioned that above.

There is a large weight savings with the 76mm over the factory 90mm supercharger pulley. (76 also makes more power than the 77)

the 2 sizes you mentioned are identical. Crank pulley will have less belt slip. But you could buy a belt wrap kit for the difference and still have $100 left over.

shardul

iTrader: (1)

If you choose to go the SC route
77mm SCP is the smallest you show go without over spinning the blower past its efficiency point and generating heat.
Lot of cars are running the 77mm with out any issues and running good times.
Too bad I don't tell my customers to make pointless you tubes video showing a single pull.

VictoryRoadPerformance

you say 77 is the smallest. Yet you encourage stacked pulley setups.
you say 72 is a heat pump. Yet you encourage stacked pulley setups.
on your own car you ran a 195CP.

--------------

76 Will not overspin the blower or create any measurable amount of heat over the 77. It' a better pulley with a slightly smaller dimension.

Its Annodized with zinc coated heavy duty springs. And we maintain a 0 failure rate. Also made right here in the USA.

wether you decide on a crank or supercharger pulley we are here to help. Feel free to give us a call if you' like to talk about them in depth.

There' nothing wrong with a crank pulley if it's in your budget, but we feel there are more efficient ways to spend your money given the advantages of the SC pulleys.

shardul

iTrader: (1)

If they have adequate cooling, ported heads, etc etc why not.
A majority of customers don't have the above mentioned mod so we recommend sticking with a 77mm as the smallest size.
Besides youtube videos do you have any good 1/4 miles times to support you claims?