I called up ATI and they said any of these would work for a street/strip 383 that might see a shot of nitrous. I couldn't for the life of me get the ATI guy to say exactly which one was best for my setup.

I've asked around and heard recommendations from different people saying different things. Things like steel is for drag, steel is for circle track, aluminum is for drag, and every combination in between.

For the Fbody ATI offers these three options. Two stock diameter dampers, one with a steel shell and one with an aluminum shell. The only difference here is weight, a 3lb advantage for aluminum. Then there is an underdrive model that is a smaller diameter than stock which is a 5.25lb advantage over the stock diameter steel unit. All units offer a steel hub. There is an aluminum hub available, but I don't want to go that far.

As of right now I'll only being running a relocated alternator, so I'm not sure if the 10% underdrive model would help with anything other than weight. This is a drag car that will see occasional street duty, it has a spool, FMVB, and no HVAC.

I always thought the more weight you can take from the rotating assembly the better, but I also know you don't gain something without losing something else. It seems most cars who see street duty run steel ones.

Here are the options with part numbers.

917270 - 7.53" - 9.75 LBS - STEEL
917268 - 7.53" - 6.75 LBS - ALUM
917271 - 6.78" - 4.50 LBS - ALUM [10% Underdrive]

http://www.atiracing.com/products/da...ts/damserp.htm

Thoughts, experiences, or recommendations?

-Dustin-

 

What is your bobweight and how was your rotating assy balanced?

I use the heavier damper most of the time because they do a better job of dampening. If you're running really lightweight components and have a really good balance job then the aluminum would be my choice.

I would rather protect the rotating assy better over making an extra .2 hp

 

I would choose the stock size steel one.

 

The rotating assembly is getting balanced tomorrow. I have standard weight Callies crank, Eagle H beams, and Mahle pistons.

Sounds like I should just run the steel one. I figured I might gain a little with something lighter, but I'd rather have a reliable motor.

-Dustin-

 

Agree.

Rich

 

I went with the stock sized steel Superdamper on my 383 for the reasons noted above.