ATI Super Damper

[Speed Junkie]

So has anyone installed one of these? Coming from the Miata world, they're pretty common with the BP engine since the crank/rotating assembly starts vibrating at higher RPMs and the damper seems to eliminate that.

I know that the RPM limiting factor in SRs are the rockers but I wonder if there's any advantage to be gained in <7000 RPM operation. At least in having a "smoother" running engine.

[jumpman2334]

i have seen plenty of builds with dampers (SR and non SR). I also came from the Miata world many moons ago and that was a must if you were going to use anything other than stock, BP powerplants turn into a ticking time bomb if you put a non dampered crank pulley on it. other platforms seem to handle non dampered pulleys 'better'.


will it be stock, or will you be building it? if its the latter I suggest a ATI damper for added insurance.


I suggest you read this:
http://www.atiracing.com/products/dampers/damper_dinan.htm

[Speed Junkie]

I plan on keeping my engine relatively mild and not going over 300hp. I currently have S14 SR with S15 turbo, S15 injectors, and 300ZX MAF. Maybe it will lower engine vibrations at idle.


EDIT:

Another important thing to note is how the S15 factory flywheels are dual mass flywheels. I wonder if reducing torsional crank vibrations was the main reason Nissan used one in the later iterations of the SR considering how hefty these things are. Seems like an overly-engineered part if it was just designed to reduce the friction disc engagement.

[jumpman2334]

is the stock pulley dampened? im gonna assume so; you could probably get away with buying a new oem one if you don't want to shell out money for a ATI (its double the price of the oem one). I don't have any direct experience with SRs, but I know the BP/Miata guys did that on mild turbo builds and got away with it just fine.


edit:
I googled "sr20det crank pulley oem vs ati" and got some hits. I recommend you check that out and see what people are saying as its specific to this powerplant.

[Speed Junkie]

Yeah, as I mentioned on the edit above, I have a suspicion Nissan came to later discover higher(?) order vibrations on the SR cranks and added the dual mass Flywheel as an improvement in the S15 generation.

[TheRealSy90]

I’d recommend an ATI damper even on a stock sr20 if it’s going to be driven hard.

[tuzzio]

I have one on my KA with no issues.