Problem cutting a light

Myron Piatek · 09-21-2014, 10:16 PM

It's a good sign if you're consistent. But is there another carb you could try? Could you have a carb "flat spot" that's not very obvious? Converter might be at least part of it, but that's still a lot to be "off".

russellauto1 · 09-21-2014, 10:18 PM

It's a fuel injected car. It could possibly be converter. I ordered this one from mark yacovone . I have never tried another converter in it.

west coast · 09-21-2014, 10:21 PM

Whats the launch rpm?

russellauto1 · 09-21-2014, 10:27 PM

Starting line rpms are 1500. I've tried 2000, but 60s slowed down and didn't seem to improve lights.

Myron Piatek · 09-21-2014, 11:06 PM

Quote:

Originally Posted by russellauto1

It's a fuel injected car. It could possibly be converter. I ordered this one from mark yacovone . I have never tried another converter in it.

I'm not familiar with FI cars, but I suppose it could still have a "flat spot" at the hit if the fuel curve isn't correct. Kind of like having an accelerator pump squirter that is way off on size and/or duration.

Off hand, I can't imagine a converter affecting RT's that much.

As an experiment, perhaps you can compare yourself to someone else in another car or practice tree to see how much of a variable you might be. Just trying to cover all the bases.

Mark Yacavone · 09-21-2014, 11:39 PM

Joe, How high can you foot brake it to? I can't imagine a higher starting line RPM not affecting r/t.
Being a Pure Stocker with limited duration, it may indeed go faster leaving at a low RPM.
You might end up with an eliminator setting and a different one for qualifying ..Not unheard of.

Neil Smedley · 09-22-2014, 12:11 AM

The last thing to leave the line is the front wheels...start limiting all the wasted motion that the car goes through........too much front end travel......not enough air in slicks ect....even consider solid body bushings...

Robert Simpson · 09-22-2014, 06:20 AM

How much air in the front? With 26" it would take a large change in air pressure to affect rollout. Also, how high can you make the rear tires? Lastly, you sound consistant at the tree. Try (in testing of course), bumping in deeper on the line. Two runs only bumping once, then two runs bumping twice etc. It is worth a shot.

GUMP · 09-22-2014, 07:40 AM

You might want to try a taller rear tire. I believe the class allows a 29.5" x 9".

09-21-2014, 10:16 PM	#1
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,542 Likes: 34 Liked 138 Times in 51 Posts	Re: Problem cutting a light It's a good sign if you're consistent. But is there another carb you could try? Could you have a carb "flat spot" that's not very obvious? Converter might be at least part of it, but that's still a lot to be "off". __________________ LOCOMOTION Racing

09-21-2014, 10:18 PM	#2
russellauto1 Member Join Date: Oct 2008 Posts: 150 Likes: 2 Liked 35 Times in 6 Posts	Re: Problem cutting a light It's a fuel injected car. It could possibly be converter. I ordered this one from mark yacovone . I have never tried another converter in it.

09-21-2014, 10:21 PM	#3
west coast Senior Member Join Date: Dec 2008 Location: Rainy Washington Posts: 613 Likes: 12 Liked 230 Times in 75 Posts	Re: Problem cutting a light Whats the launch rpm? __________________ James Boyce 6052 K/SA Stock National record holder 2015,2018,2 times in 2022,2023

09-21-2014, 10:27 PM	#4
russellauto1 Member Join Date: Oct 2008 Posts: 150 Likes: 2 Liked 35 Times in 6 Posts	Re: Problem cutting a light Starting line rpms are 1500. I've tried 2000, but 60s slowed down and didn't seem to improve lights.

09-21-2014, 11:39 PM	#6
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,840 Likes: 2,934 Liked 5,152 Times in 1,966 Posts	Re: Problem cutting a light Joe, How high can you foot brake it to? I can't imagine a higher starting line RPM not affecting r/t. Being a Pure Stocker with limited duration, it may indeed go faster leaving at a low RPM. You might end up with an eliminator setting and a different one for qualifying ..Not unheard of. __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers

09-22-2014, 12:11 AM	#7
Neil Smedley Member Join Date: Feb 2002 Location: Phoenix, AZ Posts: 163 Likes: 32 Liked 22 Times in 7 Posts	Re: Problem cutting a light The last thing to leave the line is the front wheels...start limiting all the wasted motion that the car goes through........too much front end travel......not enough air in slicks ect....even consider solid body bushings...

09-22-2014, 06:20 AM	#8
Robert Simpson Senior Member Join Date: Aug 2004 Location: Jacksonville, Florida Posts: 808 Likes: 7 Liked 20 Times in 12 Posts	Re: Problem cutting a light How much air in the front? With 26" it would take a large change in air pressure to affect rollout. Also, how high can you make the rear tires? Lastly, you sound consistant at the tree. Try (in testing of course), bumping in deeper on the line. Two runs only bumping once, then two runs bumping twice etc. It is worth a shot.

09-22-2014, 07:40 AM	#9
GUMP VIP Member Join Date: May 2002 Location: Shelby, NC Posts: 1,832 Likes: 2,198 Liked 2,364 Times in 560 Posts	Re: Problem cutting a light You might want to try a taller rear tire. I believe the class allows a 29.5" x 9".