Fun with troubleshooting leanness (and 5th gear cruising temps) |
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Fun with troubleshooting leanness (and 5th gear cruising temps) |
emerygt350 |
Mar 15 2024, 03:37 PM
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#1
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Advanced Member Group: Members Posts: 2,140 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
So I have been playing with adding resistance to the cht to bump my mixture. Messing with the mps was not getting me to where I wanted to be I wanted something a little more global. Anyway, bought a 10 dollar Bluetooth relay. Set it up so one channel was clean the other had 50ohms resistance in it. As I am driving I can switch back and forth and watch the results on the cht and AFR. 50 is really working well (this is all in addition to my 250ohm found on 73s). Now I have added another 20 ohms to the alternate so the relay will switch between 50 and 70. It ain't pretty but it's only for troubleshooting.
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emerygt350 |
Mar 16 2024, 07:37 PM
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#2
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Advanced Member Group: Members Posts: 2,140 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
I put a boroscope on my fuel pressure gauge and put it through its paces, all good. 29lbs.
Yeah, my tests are done at 72, then I try it at 60, checking the plugs after immediate shutdowns. I have an AFR but I don't trust it much. It can tell me if I am richer or leaner than before but I don't have much faith in the number it gives me. I have it set up with a 150 +the 250 for tomorrow. I want to see if I can go a little into the stinky rich range. So far I am not there. I have found this more useful than tweaking the mps. This seems to behave better across rpms, throttle position , and vacuum level. I think setting the curve in the mps perfectly, richening to taste with the inner screw, then fine tuning with resistance might be the right thing, at least for this engine. I found the inner screw would give me rich spots I didn't want and barely nudged my cruising AFR (17-12inhg). |
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