advancing the timing
Thread Starter
Pro
Joined: Jun 2001
Posts: 520
Likes: 6
From: Elverson PA
advancing the timing
I was thinking about advancing my timing a couple degrees today before I go to the dragstrip today. I was reading here last night that 8 deg. btdc is a good place to start. What are the opinions on this? Will I gain anything from doing this?
Also, does anyone know how low air pressure you can use in bfgoodrich comp t/a zr's (255/50/16). I was going to try 20 psi today. I always have to launch from idle so I don't fry the tires, but I know if I can get traction from 2k rpms I can get a better time. I used to use 25 psi last year.
Thanks.
Dave Seel
Also, does anyone know how low air pressure you can use in bfgoodrich comp t/a zr's (255/50/16). I was going to try 20 psi today. I always have to launch from idle so I don't fry the tires, but I know if I can get traction from 2k rpms I can get a better time. I used to use 25 psi last year.
Thanks.
Dave Seel
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: advancing the timing (black85)
Often advancing the timing will provide great results. The best way *I* have found to determine the optimum number is to advance it 2* at a time and compare the 1/4 mile mph's. When It starts to slow down, back it off to the setting that gave the highest mph.
*I* don't have any experiece with those tires, but I'm guessing the 20# would be close to the bare minimum. You want to run the highest pressure, consistant with traction. More pressure equals less rolling resistance and better high speed handling.
I'll be at the track tonight, also, Good luck and...
RACE ON!!!
*I* don't have any experiece with those tires, but I'm guessing the 20# would be close to the bare minimum. You want to run the highest pressure, consistant with traction. More pressure equals less rolling resistance and better high speed handling.
I'll be at the track tonight, also, Good luck and...
RACE ON!!!
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Re: advancing the timing (black85)
Those BFGs have super stiff sidewalls... not the best thing for drag racing!!
you will have to mess with pressures until they make sense... remember one thing, when they heat up, the pressure WILL go up!
Good luck!!! :cheers:
you will have to mess with pressures until they make sense... remember one thing, when they heat up, the pressure WILL go up!
Good luck!!! :cheers:
