ZR-1 Net Registry Forums - View Single Post - Dual Mass vs. Single Mass Flywheels, Advantages/Disadvantages??????????

Paul Workman · 08-18-2014

I guess I'm just lucky. I have very little rattle if any in neutral (evident by the video I linked to). Lee reminded me too that in addition to the 850 rpm idle, Accel injectors, new plugs, I also have a Centerforce, Camaro LT1 sprung hub (Centerforce # 381039 from Summit Racing).

I noticed a difference in technique when pulling away from a stop, i.e., a little more feathering perhaps than was needed with the heavier FW. But, after just a couple hours in traffic, I no longer notice it.

As for deceleration, maybe because mine is a 90 and typically is slow to return to idle (that was later "fixed" in subsequent calibrations) I can't say it has been a problem - decelerating to quickly*.

*I notice tho that when decelerating from speed, as in during the Mountain Run 2, the engine stalled - an old problem that seemed to return that had disappeared for a couple years. The stalling isn't the fault of the flywheel, I don't think. I rather suspect it might be something like oil in the MAP tube - which was an issue once when I first got the car in 2007.

I had already purchased the oil separator to address oil getting into the MAP and fouling the valves and combustion chambers. So, now that it has been installed, we'll see if that was the issue. However, the flywheel weight isn't a serious consideration, at this time.

08-18-2014	#30
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	Re: Dual Mass vs. Single Mass Flywheels, Advantages/Disadvantages?????????? I guess I'm just lucky. I have very little rattle if any in neutral (evident by the video I linked to). Lee reminded me too that in addition to the 850 rpm idle, Accel injectors, new plugs, I also have a Centerforce, Camaro LT1 sprung hub (Centerforce # 381039 from Summit Racing). I noticed a difference in technique when pulling away from a stop, i.e., a little more feathering perhaps than was needed with the heavier FW. But, after just a couple hours in traffic, I no longer notice it. As for deceleration, maybe because mine is a 90 and typically is slow to return to idle (that was later "fixed" in subsequent calibrations) I can't say it has been a problem - decelerating to quickly. I notice tho that when decelerating from speed, as in during the Mountain Run 2, the engine stalled - an old problem that seemed to return that had disappeared for a couple years. The stalling isn't the fault of the flywheel, I don't think. I rather suspect it might be something like oil in the MAP tube - which was an issue once when I first got the car in 2007. I had already purchased the oil separator to address oil getting into the MAP and fouling the valves and combustion chambers. So, now that it has been installed, we'll see if that was the issue. However, the flywheel weight isn't a serious consideration, at this time. Last edited by Paul Workman; 08-20-2014 at 07:25 AM.