Single channel O2

Michael Beard · 07-18-2011, 06:02 PM

I just have it in closed loop in these early stages while I try to get the fuel map in the ballpark. At least if I get it too lean, it tries to richen it back up toward the Target A/F so I'm less likely to hurt something. I actually got things pretty close to where I wanted them at Maryland last week. Once I'm comfy with my general setup, I'll go back to open loop.

My biggest question marks currently are around the driveability/staging/launch area. Right now it's reading lean driving around the pits, real rich around launch in order to cover up any launch stumble (I know this really needs to be done rather with the acceleration enrichment deal, but I need to gain a better understanding of its use in practice. I understand that it's like an accelrator pump shot, but like everything else, I'm just trying to get a handle on what the numbers mean and "how much is how much?").

I've done a little reading in different forums, and seems like they're saying I should be around 14.5 or so driving around the pits (low TPS, low rpm). I've heard some people say they've got it CRAZY lean at launch rpm (doesn't sound like a good idea to me, don't want to hurt something), and others say a hair on the rich side (12.5). Again, as far as downtrack performance, this thing just flat hits a wall at 13.3 and won't get out of its own way unless I richen it up. In total, this thing just gobbles fuel.

Oh, one other (unrelated?) issue I'm having is that about once every 8-10 starts, the starter's kicking back. Never did that with the old motor, and all the other times, it fires right up almost instantly.

I don't have internal logging set up just yet, but have logged some runs via the laptop in testing.

07-18-2011, 06:02 PM	#18
Michael Beard VIP Member Join Date: Sep 2002 Location: Columbus, OH Posts: 4,060 Likes: 0 Liked 13 Times in 9 Posts	Re: Single channel O2 I just have it in closed loop in these early stages while I try to get the fuel map in the ballpark. At least if I get it too lean, it tries to richen it back up toward the Target A/F so I'm less likely to hurt something. I actually got things pretty close to where I wanted them at Maryland last week. Once I'm comfy with my general setup, I'll go back to open loop. My biggest question marks currently are around the driveability/staging/launch area. Right now it's reading lean driving around the pits, real rich around launch in order to cover up any launch stumble (I know this really needs to be done rather with the acceleration enrichment deal, but I need to gain a better understanding of its use in practice. I understand that it's like an accelrator pump shot, but like everything else, I'm just trying to get a handle on what the numbers mean and "how much is how much?"). I've done a little reading in different forums, and seems like they're saying I should be around 14.5 or so driving around the pits (low TPS, low rpm). I've heard some people say they've got it CRAZY lean at launch rpm (doesn't sound like a good idea to me, don't want to hurt something), and others say a hair on the rich side (12.5). Again, as far as downtrack performance, this thing just flat hits a wall at 13.3 and won't get out of its own way unless I richen it up. In total, this thing just gobbles fuel. Oh, one other (unrelated?) issue I'm having is that about once every 8-10 starts, the starter's kicking back. Never did that with the old motor, and all the other times, it fires right up almost instantly. I don't have internal logging set up just yet, but have logged some runs via the laptop in testing. __________________ Michael Beard - NHRA/IHRA 3216 S/SS