So im looking to experiment and wanted some feed back as how I might achieve this.

APD Max Speed Carb (throttle stop built in), Grid Ignition, Biondo Mega 450. I want to run 80% throttle or so for 500 feet then go wide open. How do I get to the 80% throttle, it would need to be 80% at launch or instantly after.

I am only really familiar with setting up for .90 racing but that's factored on RPMs while on the stop not an actual percentage.

I do it the same as S/C racing but don’t change the stop timer. Figure out about 80% open and an approximate time to get you to 500 feet. If you have a data logger it might be a little easier. Good luck!

quote:

Originally posted by Cashflow:
I do it the same as S/C racing but don’t change the stop timer. Figure out about 80% open and an approximate time to get you to 500 feet. If you have a data logger it might be a little easier. Good luck!

So I am assuming you would increase your stop RPM to 80% throttle then just figure out the time to the 500ft mark correct? Are you shifting on time or RPM?

Manually set the throttle shaft position with an angle gauge.

quote:

Originally posted by Goob:
Manually set the throttle shaft position with an angle gauge.

Can you explain this process using a MaxSpeed Carb

quote:

Originally posted by SmokinChicken:

quote:

Originally posted by Goob:
Manually set the throttle shaft position with an angle gauge.

Can you explain this process using a MaxSpeed Carb

I've only got one picture of one to look at, but if you can secure an angle gauge to the manual linkage, or maybe just a protractor to measure the sweep of the throttle arm?
Measure the throttle arm travel and stop it at 80%-ish?
Measure WOT at the throttle plate inside the bore, and close it down to 80%?

If it is like a stop. Count the turns from fully closed to fully open then close it 80% by the turns. So my stop is 15 turns from closed to open. So 12 turns is 80%.

ep

I shift by time, I don’t change it during the race.