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: 2,131 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 17 2024, 01:50 PM
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#2
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Advanced Member Group: Members Posts: 2,131 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
I went all the way to 200+the 250 today. Played with timing (left the advance hooked up all day), gave it a little more on the inner screw, etc. even took the shield off the fan intake (stole it from a bus motor). I had a brand new O2 sensor I put in today as well. I was running 12.8 to 13 at cruise. Never went over 400, tends to sit at 375 up and down small hills at 72 mph 3200rpm. Cools rapidly on down hill. It was a cool day today though, 45 degrees at the warmest. Oil was great all day till I dropped the timing to 7, then the oil warmed a little. Put it back up to 8.5 and the oil came back down. Didn't change cht much. Extended long hill sat me steady at 394 (fighting a strong wind too). Cht from plug on cylinder 3 of course.
I may just have to suck it up and deal with it. Maybe I went a little higher than the 8.6 I calculated for compression. Probably get to the Dyno next week. |
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