Additional ignition timing for 60 feet"

September 22, 2025, 09:24 PM

Well, with my slow junk 5.40-5.50 setup I can run as much as 42 degrees on alky and pull 6 out of it down track. It 60 fts pretty good if it hooks. Fat + a bunch of timing = good 60 fts for me.

I figgerd that out years ago.

I do it with my delay box timers and a step retard.....

Cutting edge stuff.

October 20, 2025, 12:08 PM

B KING

quote:
Originally posted by David Gerard:
quote:
Originally posted by Mark Yeager:
Can you get some ET be leaving higher on launch rpm?

I talked with COAN this week and he said with our tight TD 2 piece converter, the 60', ET, etc., would not significantly change with 500 RPM more launch stall.

He did say that it should improve RT's a little!

Many members suggested going up in launch rpm instead of adding timing. It seemed like you kind of dismissed the suggestions or maybe you did try them.

Here's a little bit of testing I did at this past weekend's TnT on Fri. Both runs were made in the right lane & I was unable to make a 3rd attempt because it was a cluster F...!

Anyway the 1st pass was made at our normal launch rpm. The 2nd run we added 400 rpm to the launch limiter.

Results:

1 lb. more boost at the launch & a quicker 60' by .022. This of course improved all times & mph down track.

I wanted to get the 3rd run in with another 400-rpm added to the launch rpm but that didn't due to the track cluster. That would have added another 2 lbs. of boost.

2BKING

October 20, 2025, 12:25 PM

moparacer

On my NA car 4500 RPM launch is 1.21-1.22 60 ft. IF it hooks. 4000 Puts me at High 1.23-1.24 range and is more consistent. So it slows me up roughly .02 to .025 also.

November 06, 2025, 10:33 PM

seabass

quote:
Originally posted by B KING:
quote:
Originally posted by David Gerard:
quote:
Originally posted by Mark Yeager:
Can you get some ET be leaving higher on launch rpm?

I talked with COAN this week and he said with our tight TD 2 piece converter, the 60', ET, etc., would not significantly change with 500 RPM more launch stall.

He did say that it should improve RT's a little!

Many members suggested going up in launch rpm instead of adding timing. It seemed like you kind of dismissed the suggestions or maybe you did try them.

Here's a little bit of testing I did at this past weekend's TnT on Fri. Both runs were made in the right lane & I was unable to make a 3rd attempt because it was a cluster F...!

Anyway the 1st pass was made at our normal launch rpm. The 2nd run we added 400 rpm to the launch limiter.

Results:

1 lb. more boost at the launch & a quicker 60' by .022. This of course improved all times & mph down track.

I wanted to get the 3rd run in with another 400-rpm added to the launch rpm but that didn't due to the track cluster. That would have added another 2 lbs. of boost.

2BKING

rpms on the line definitely help the bottom end, depending on the size of the blower