Fun with troubleshooting leanness (and 5th gear cruising temps) Options

[emerygt350]

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.

[emerygt350]

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.

[Porschef]

That smoothed out the curves, and we bumped it to 29 degrees at 3400, which improved the imaginary numbers over 3k quite a bit.

[That’s where I have mine set, I believe that is the typical setting.]

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.

[I usually run 87 until the weather gets hot, then 89. Never seemed to see the benefit from 93]

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.

The Dakota unit seems to be unaffected by what is usually slightly lower voltage in my car, it typically runs at just under 13V

If you really want to improve the shifting, spring for the Tangerine firewall bushing. I’m sure you got a big improvement with the factory style bushing, but Chris’ product really made a major difference