flanders

ATI is either 10% underdrive or 7% overdrive for the street version.
Not sure why you would want to change the ratio but I read it was designed for another engine so that might be the reason.
I would probably go for the Fluidamper instead Fluidampr URGE designs

sirbikealot7

I'll be using a Fluidampr

justin3

Yes, the ATI race version which is 10% underdriven won't clear the factory water pump pulley so either custom WP pulley must be used or some other form of external water pump must be fitted. The advantage of an underdriven dampner is that it is less drag on the engine. Now the overdriven street version can be beneficial to the supercharged crowd out there in allowing them to make a little bit more boost by changing the pulley ratio from the bottom end not just the top.

flanders

Does the alternator, water pump and AC like to be over driven though?

E4RTH WORM JIM

Just thought I'd update this thread, my pulley has failed and has started to get a wobble on when the engine/motor is running.

For the record my car is SC'ed, I think the CT pulley that mounts onto the OEM pulley has caused it.

Just wish there was any after market one that worked with SC'ed cars

Sylvain2000

Well that is the first tome i read about a bad crank pulley!!

Good to know!!

As i was going trought this thread i really tought this had kind of never happen. But there it is.

Thanks for sharing!!!

Was there any sign before it got bad ??

Chibo

I put one through the hood of my BMW 335D at 40k miles.

E4RTH WORM JIM

Wow

justin3

I don't know much about the fluidamper ones as far as compatibility with other aftermarket pulley setups, but I know ATI has provisions for other pulleys and mandrels to bolt up to the front of them. Plus if they don't have it on a shelf, you can have it custom made with out much effort, typically just takes a phone call and a brief explanation of what you have going on and they can set you up with what you need.

thomsbrain

Good ol' German engineering.