djhedges

I can't run the round tops in ITS and I've heard of others getting the flat tops to work really well. The guy I bought the car from won plenty of races with the flat tops so they are doable.

Has anyone had any experience or tips for tuning these carbs for specifically for racing? I recently bought a ITS prepped 260z with the flat tops. All the emission stuff is plugged and the choke removed. The car has EGTs which show about 1100F at WOT on the straights. Last weekend we had a test and tune day at Oregon Raceway Park. The track is at about 2300ft elevation and the temperature was in the low 40 to mid 40's that day. We pulled the carbs and measured the needle at 45mm. We tried moving the needle to 45.5mm, 46.5mm and backwards to 44mm. EGTs still read 1100F except for the 44mm which was at 900F. We readjusted the valves and checked the compression. The plugs were gapped at 1.2mm instead 0.8mm. After regapping the plugs it idled much better but I won't have it on the track again until the 17th. Got any other suggestions?