It's not a case of poor quality on the part of the unit but an inability to handle abrupt changes in crankshaft rpm (deceleration as the clutch is dropped) while the accessories (A/C clutch, alternator, etc) momentum momentarily overdrives the outer ring.
Last edited by Hemissary; 01-03-2012 at 11:55 PM.
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Id have to agree, the SLP unit is not a good match to a big power 6 speed.
9.18 @ 150 mph
Wouldn't your comment be similar to the same reaction we're creating by upgrading the trans with blue tops, valve bodies and increasing the shift firmness with a tune?
'06 Silver R/T with Road and Track on UAS
the 3rd one ran almost a year with a ATI and dropped a valve the crank was inspected and rebalanced for different pistons then ran 6 weeks less than 400 mi with the SLP Afterwards I took all the parts back to the machine shop to get the block and rods checked the machinist threw the SLP underdrive into the trashcan and stated " Don't ever put one of these pieces of SH!T on a race engine" only use a ATI or fluid type dampener.
the SLP had slipped on itself also in the end
Listen for a couple hundred extra bux, get the ATI. Just my opinion but its worth it when you are spending thousands on your motor.
This can easily be seen on datalogs where folks leave the line with a standard, versus say 1/2 shift on an automatic (look at the rpm slope)
Your suggestion does indeed add another element though cause the failures appear to be automatics...
thats cause manual cars that are raced are few and far between.
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I think a lot of it has to do with cheap ass Chinese crank castings lightened too much and the fact that there is no main/rod journal overlap . The 7/8 throw has very little metal to handle the torque of the first 6 rods and pushing 2 tons of car = short life span
And a Psycho behind the wheel doesn't help matters much.
My comment on the ATI pulley as opposed to the SLP pulley is based on actual friends that have used both in auto and std. applications and all have much more success and no failures to date using the ATI damper pulley.
A good friend has a 530rwhp / 500rwtq 6spd. 5.7 Chally with the ATI and the engine is smooth as silk and strong as an ox, and for the extra $$$ it is worth it for the added measure of peace of mind.
I'm not at all trying to trash the SLP, but based on what I've read and expereinced first hand in real world track conditions the ATI damper is just that much better to employ on ones engine.
However, we also all know of one particular Sik300SRT8 that is crazy fast and powerful with higher mileage, a stock block and done up top end with juice that is as dependable as ever and still keeps going that uses the SLP, and to the best of my knowledge he has had not one single problem related at all to do with using the SLP.
In the end one can just call it to each their own and do whatever the heck you want with your own $$$.
My $$$ is on the ATI, and that is my $0.02 on that.
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ATI has been around for a long long time. Im sorry but those two pullys are apple and oranges THe ATI is FAR superior then the Powerdyne. Once you see the two next to each other you can see what most of us are referring too.
Anyways here's another one for ya. k-1 crank running a Powerdyne. Coincidence? Ill let someone else find out ..lol