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| Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here. |
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#1
11-12-2018, 02:57 PM
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My apologies Squid. You have always been a source of helpful information. Sorry for the hi jack
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462 Yc Block, zero deck Probe forged pistons 6cc relief, Scatt Hbeam rods floating pins aprox. 10.21 CR Comp Hyd-roller cam,roller lifters,springs ect. 236 244@ .050 108 LSA .511 lift, duration 289,297 @.oo6 Edelbrock Aluminum 87cc round port heads Larger valves ,ported polished and cut Powerjection3,T2 manifold, Try-y’s Flowcooler water pump. 71 formula with TKO600,hydraulic clutch 3.42 posi and 26 inch tire. 17x9 YO Honeycombs with Nitto 555's |
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#2
11-12-2018, 03:09 PM
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Quote:
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"...ridge reamer and ring compressor? Do they have tools like that?" |
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#3
11-12-2018, 04:10 PM
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I downloaded my data logs, and did some charting. Attached below are a couple of runs, back to back, with some of the dead time truncated. The composite of rpm, afr, etc. is the first one. The next ones scale back the size by eliminating the rpm and fuel flow rate to focus on the smaller numerical data streams (afr, afr target, inject duty cycle).
One thing I was worried about was fuel flow up around 5k, and if I had any unexpected lean condition. Power has always nosed over above 5k, and I wondered if there was a fuel delivery issue from the pump/regulator. This doesn't show any evidence of fuel starvation, since the system was able to maintain afr of 12.5 to 11.9 against a target of 12.1 throughout the WOT condition. I suspect the variation was due to shifting gears, and the engine loading change. Looking at the injector duty cycle, it never got over 30-something percent. I guess that means I have a lot of headroom for a bigger engine, huh?  The only 2 things of concern I could see were highlighted in yellow. 1. At the start of the run (launch), It went momentarily a little lean, and then over-corrected. It started out with idle afr target of 13.45. Then I launched off the foot brake and mashed the pedal to WOT. AFR went up to 14.0, then corrected down to 11.9 until coming back to the targeted 12.1. I'm thinking maybe I give it some more "pump shot" fuel to smooth out that lean jump? I also wondered if I can speed up the response gain to minimize the overshoot below afr target (when it went to 11.9). 2. Letting off the pedal at the end of the track caused my AFR to jump lean to 20.6. Is this normal, or something to be concerned with? At this time it was just coasting and braking. Maybe an adjustment to the decel fuel cutout? It seems odd to me that the computer would be targeting 14.2-14.3, yet readback was at 20.6. Thoughts welcome!
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"...ridge reamer and ring compressor? Do they have tools like that?" Last edited by Squidward; 11-12-2018 at 04:15 PM. |
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