The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Holley Sniper Timing Control

davepl · 05-14-2018, 12:06 PM

I have a ZZ502 that I am putting a Holley Sniper EFI unit on. I'm wondering if the car would actually benefit much from ECM timing control. Right now I'm not planning on it, and will just continue with the mechanical distributor.

The cam in the ZZ502 is 224/234. In theory, the computer should be able to "smooth" the idle out by advancing/retarding individual spark pulses.

What I don't know is how well it does that and whether it's worth it on a motor with this cam.

Would I like it to idle smoother? Sure, I suppose I would. But I have no idea what kind of difference if any, it would make. Has anyone experimented with enabling/disabling computer control of the timing to see what difference it makes?

05-14-2018, 12:06 PM	#1
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Holley Sniper Timing Control - Worth it on ZZ502? I have a ZZ502 that I am putting a Holley Sniper EFI unit on. I'm wondering if the car would actually benefit much from ECM timing control. Right now I'm not planning on it, and will just continue with the mechanical distributor. The cam in the ZZ502 is 224/234. In theory, the computer should be able to "smooth" the idle out by advancing/retarding individual spark pulses. What I don't know is how well it does that and whether it's worth it on a motor with this cam. Would I like it to idle smoother? Sure, I suppose I would. But I have no idea what kind of difference if any, it would make. Has anyone experimented with enabling/disabling computer control of the timing to see what difference it makes? __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible