Thrust issues with AFR gauge and Brawler carb
I did a voltage measurement from ballast resistor that is blue ignition on- wire. While ignition key on, it showed excessive voltage drop about 2 volts (between battery and ballast resistor).
With key on, engine off, there should be very little voltage drop because the only current moving is to power alternator field, the coil (and ECU if there is one). If the ammeter shows more than 5 amps discharge then something is wrong (or there have been modifications).
With the engine running, the voltage difference between the alternator output and the VR input (ign terminal) should be small. Less than 0.5 volts. With an electronic ECU, the closest place to measure is the ballast resistor ignition run wires (J2 blue with stripe), the bulkhead connector, or the alternator's field terminal wire (blue, from ignition). The power source is the alternator. Measure from there. Make the voltage drop measurement after the battery is recharged.
Do a search for more about this. I'm short on time to type. Sorry.
I have already bypassed the bulkhead connector from firewall. I need to figure out where the problem is.
Losses in the steering column connector are common, and on some years there is a also an engine connector.
I ordered pin gauges and emulsion jets.
Good.
Always good to measure out the carb restrictions and placements.
Some details on excessive emulsion here
racingfuelsystems-Emulsion Tuning
Bottom line is two is enough, especially with a kill bleed. As long as they are not too big
Three is OK if they are small enough.
Seeing it drop stepwise rather than taper suggests it may not be a jetting or air bleed issue.
Being in second gear it may only be hitting load part way up the rpm. Load slows the engine, adds heat, and is the engine condition that really matters at WOT.
As far as the AFR numbers, they make sense. Rich idle. Leaner off-idle light load, low throttle. Leanest moderate throttle acceleration. Then rich approaching full throttle.
https://www.tapatalk.com/groups/rac...or-afr-characteristics-at-differen-t1350.html