final verdict on FFP UD pulley for 3400?

[Froggx]

I've heard good and bad things about this little guy.

Good things are things like "he will add 5 hp and 8 ft-lbs of torque and will extend how high your motor can rev before hp drops off" and I see this and I say "this is good."

Then I see bad things like "your motor will shake apart due to the crank pulley acting as a harmonic balancer and the ffp pulley is too light, you will be so dead" and I say "this is not so good."

So, anyone have real dyno #'s for this guy, experiences with him, etc.?

Keep in mind I am not speaking of the RSM pulley, that thing should be regulated to scrap piles for being too light and not actually providing an underdrive effect.

[imported_germ]

the FFP UD Pully is the SHIT!

i love mine and will always have one on my car

i have had ZERO vibration issues

and our motors are internally balanced, so the crank pulley does nothing for balancing, except for that TINY bit of rubber on the stock pulley that does nothing except asbsorb the smallest amount of vibration, but you cant tell either way.

yes it adds HP

yes it does help rev faster

and yes, i recomend it 100%

[SappySE107]

Well, that small rubber part is important for vibrations due to internal combustion...nothing to do with internally balanced at all. However, it doesn't seem to be causing any issues with the motors they are on so I can't see it being too important either. So, its worth getting, the dyno numbers on FFP's site are real, and if you COULD find an underdrive pulley with the rubber ring...that would be the only reason not to get the FFP one.

[imported_germ]

my post must have been read wrong, i did say that it was for vibrations, but i see where you think i ment it was from the balancing, which is not what i ment.


and yes, if there "were" an UD pulley with the rubber seal, that would be the "best" design, but may not be the best overall.

personally, i see no harm or ill effects with the FFP UD Pulley

[feavs]

I have the pulley, and although I can't vouch for performance, as I added every other mod to my engine at the same time, therefore not having a bench mark, I like it. I do think it rev's up quicker, which is awesome, because it takes no time to get to 4000 rpm, and thats when my cam really opens up. My engine runs smooth as hell. You could set a glass of water on it while running, and the water will barely move. But, my crank has been turned and balanced (balanced beyond what they are from the factory), so that could be part of it to. I say for the money, you can't beat it.


feavs

https://www.feavs.com

[vsop4me3.1]

I am very satisfied with mine. Well worth the money

[Robb235]

No problems with mine.

I say that if you're really concerned with these "vibrations", stuff a flame retardant pillow under your hood. That will absorb more vibration than that little piece of rubber ever will.

[Froggx]

All the positive responses have managed to land one in a fedex truck with my name on it, thanks for the input.

[SappySE107]

The pillow isn't gonna absorb the vibrations we are discussing.

[Rhedalert]

The pillow isn't gonna absorb the vibrations we are discussing.

It might help the engine get a good 8 hours sleep though.

[Robb235]

The pillow isn't gonna absorb the vibrations we are discussing.

Neither is that little strip of rubber.

[RacerX11]

The pillow isn't gonna absorb the vibrations we are discussing.

Neither is that little strip of rubber.

The strip of rubber doesn't absorb anything....its the outer metal ring attached to the inner part of the pulley via the rubber strip that does. It acts lie a spring/mass/damper system to cancel out the torsional vibrations. That being said, I own a FFP pulley. The lack of a damper isn't going to kill your engine....it is more of a long-term fatigue issue, much like any other mod that increases the power of the engine.

Marty

[Froggx]

The pillow isn't gonna absorb the vibrations we are discussing.

Neither is that little strip of rubber.

The strip of rubber doesn't absorb anything....its the outer metal ring attached to the inner part of the pulley via the rubber strip that does. It acts lie a spring/mass/damper system to cancel out the torsional vibrations. That being said, I own a FFP pulley. The lack of a damper isn't going to kill your engine....it is more of a long-term fatigue issue, much like any other mod that increases the power of the engine.

Marty

In terms of long term fatigue, I can name at least 5 things on my engine that will wear it out before the lack of a crank pulley damper can get to it.