67 twin turbo dart

Matts440 said
True, was just looking for in site. They have sent the tune to megasquirt to look it over and see if he missed anything. When I was there we did log and send some to be checked over to megasquirt as well. Not really they are pretty much the only dyno shop that does megasquirt, all others are the more popular ones like your Holley. I know he kept saying it felt like the brakes were on when driving, engine revs clean he had been tuning that just to clear up the issue of the crank signal drop out which is taken care of now. Rev limiter was set to 6900 where I set it. Unless they did change it here's where I had it.

View attachment 1715914994

View attachment 1715915000

View attachment 1715915009

You’re attachments aren’t working. Given the “brakes on” comment, I would be looking for issues with driveline, like transmission or converter. How does it shift? The feel of that would make one look closer or rule that out. It still doesn’t explain the cut out at exactly 4000 rpm. That looks suspect for engine issues. What do the plugs show? Those should be your go to for anything tune related. The widebands will lie to you, the plugs always tell the truth.