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: 2,132 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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Superhawk996 |
Apr 2 2024, 12:06 PM
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#2
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914 Guru Group: Members Posts: 5,875 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
Two things likely contributing to ignition related RF.
1) Pertronix coil is lower resistance than a Bosch blue coil - therefore generates more RF. 2) 123 dizzy uses electronic switching which is almost instantaneous off/on vs mechanical points switching. This too increases RF. To reduce RF at the source: Spiral wound spark plug wires Resister plugs Go back to Blue Coil These are the quick go to solutions. He could also shield his torque sensor and instrumentation wiring as another option that might help |
emerygt350 |
Apr 2 2024, 12:26 PM
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#3
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Advanced Member Group: Members Posts: 2,132 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Two things likely contributing to ignition related RF. 1) Pertronix coil is lower resistance than a Bosch blue coil - therefore generates more RF. 2) 123 dizzy uses electronic switching which is almost instantaneous off/on vs mechanical points switching. This too increases RF. To reduce RF at the source: Spiral wound spark plug wires Resister plugs Go back to Blue Coil These are the quick go to solutions. He could also shield his torque sensor and instrumentation wiring as another option that might help I have the bosch coil sitting there, I was trouble shooting with the pertronix. I will go back (I like the look of it). |
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