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: 2,139 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 |
Apr 1 2024, 05:56 PM
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#2
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Advanced Member Group: Members Posts: 2,139 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Sooooo.... Got to the Dyno yesterday (Easter miracle). Some kind of rf interference caused his equipment to malfunction (474 foot pounds of torque?). However, we were able to work on the mix. I am now back to nothing but the 250 ohm resistance that the car originally had from the factory. I was so rich his equipment didn't go that low. We did some cruise at speed tests on the Dyno and made sure my AFR was healthy under all conditions.
That smoothed out the curves, and we bumped it to 29 degrees at 3400, which improved the imaginary numbers over 3k quite a bit. He suggested experimenting with higher octane. I put some octane booster in it today and it seemed to make a significant difference at cruise. I am keeping my fat switch though, I have an extra 100ohm resistor I can activate at will. That richens it nearly a whole point. Just in case. Anyone ever notice if the Dakota digital cht is sensitive to voltage? My regulator was misbehaving (14+ volts). Replaced it today with an adjustable solid state. Have not driven it yet however. |
Superhawk996 |
Apr 2 2024, 07:14 AM
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#3
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914 Guru Group: Members Posts: 5,891 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
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emerygt350 |
Apr 2 2024, 07:54 AM
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#4
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Advanced Member Group: Members Posts: 2,139 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Sooooo.... Got to the Dyno yesterday (Easter miracle). Some kind of rf interference caused his equipment to malfunction Could it have been your car with its old school unsuppressed ignition system? Did the problem only exist then your car was runnning? Yes, only when running, but I had it on his dyno a couple years ago before the 123ignition dizzy. It is a pertronix coil at the moment. I was suspecting the failing voltage regulator and now I wonder if the super cheap chinese bluetooth radio I installed might have been the culprit. Although that would have made a mess of things with the ignition on engine not running, which wasn't the case. |
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