We run a ProCharger Top Dragster with 25 degrees of ignition timing going down the track. Engine make about 2000HP at 8000 RPM.

I was wondering if any of the other ProCharger cars advance the launch timing arout 5 degrees or more and then retard it back to initial timing at the 60 foot ET?

Looking to pick up the 60 foot times a little!

What kind of fuel are you using?

Methanol!

We typically need to pull timing in my car. Any reason your running so little timing? We run 28 degrees in ours.

These were the best numbers on the dyno and safe A/F.

We are three ol' guys and don't want to blow it up in a fast bracket race!

Can you get some ET be leaving higher on launch rpm?

no, imo if you can advance your timing then your car isnt very aggressive down low...most have to kill et anyway so trying to gain some in the 60' doesnt usually make sense

We run a 665 BBC with an F-3 Pro Charger on methanol. The motor was built by Reher & Morrison. David Reher told me not to run more than 20 degrees or it would melt pistons. I know of 2 other teams that have tried 23 and 25 degrees and both have burned pistons. I believe the fuel system is not able to deliver the amount of fuel to use more than 20 degrees. David has told me personally do not run more that 20 degrees on our Pro Charged motor. We also run another car with a 557 BBC on methanol, with a 14-17 PSI blower with Enderle style fuel injection system. We run this combination at 36 degrees and have not had any piston problems. I believe if more fuel could be added on the Pro Charged motor, more timing could be used.

I run 28 degrees and usually pull some in the first little bit to calm it down and just be easier on parts overall. Its been as quick as .957 to the 60', but we try to keep it around .990-1.00 or so. We've ran it several seasons with no issues going 4.10-teens

This is only an F1R Side Slinger on a 582 though.

i tried that in denver once and burned a strap

just keep going up on launch

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!

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!

Curios on that your 60's are now? What rpm are you leaving at?

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!

What's it going to hurt by trying more launch rpm?

I know when I leave at a higher rpm. I have more boost = more power & if you can put it to the ground, it's quicker.

2BKING

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!

I can tell you from experience that launch rpms make a huge difference. What do you launch at now?

We ran our engine on Vrbabcic's dyno and it made just over 2000HP at 8000 RPM with 25 degrees initial lead. The MSD 7530 is set at 4,400 RPM launch.

We are three 'Ol Guys and want to run a "safe" combination all of the time!

Of course quicker and faster is always better!

quote:

Originally posted by David Gerard:
We ran our engine on Vrbabcic's dyno and it made just over 2000HP at 8000 RPM with 25 degrees initial lead. The MSD 7530 is set at 4,400 RPM launch.

We are three 'Ol Guys and want to run a "safe" combination all of the time!

Of course quicker and faster is always better!

Like J.R. mentioned, turn up the wick down low. What is your 60'?

especially if he uses a 1.65 first gear or something similar... we use 1.80's

We have a 1.80 low gear in the PG and a 4.10 gear in the rear. We are old Comp racers, so running a lot of RPM is usually just increasing the valve spring checks.

We usually run in the very low one second range and out best 6.136 ET @ 224MPH pass, we ran a 0.988 in 'mine shaft' DA.

We were 'extra strong' that weekend and qualified #1 in Q1 and ended up Q2 at the end of qualifying.

We were on an even better pass in E2, when the older Nitrous U-Joints had enough and exited the car at just before the 1000 lights. We went to Mark Williams and bought a much strong CV drive shaft.

Sounds like your setup pretty close now…