Visit The Dirt Forum for More Information

Author Topic:   Honest base line set up
20bmw
Dirt Full Roller

Total posts: 74
posted December 26, 2003 07:48 PM  
What would be a good base line starting point set up for a metric car weighing 3200-3400lbs with a sbc and powerglide running in high gear on a 3/8`s track??

What would be a honest starting point on gear ratio,wheel offset,roll out,springs,and the %`s

Thanks to all who help..

modracer09
Dirt Full Roller

Total posts: 66
posted December 26, 2003 08:53 PM  
quote:
Originally posted by 20bmw:
What would be a good base line starting point set up for a metric car weighing 3200-3400lbs with a sbc and powerglide running in high gear on a 3/8`s track??

What would be a honest starting point on gear ratio,wheel offset,roll out,springs,and the %`s

Thanks to all who help..



Id run in low with a 373 rear gear with 82- 84"s on the back with rr 2" offset and a 3" on the lr i ran about 1" of stagger in the rear with 14lbs in the rr and 10lbs in the right. springs 250lr,200rr 1100rf,900lf the front i ran 80-84" roll out and 1/2'-1" stagger with 2 and 3" offsets. i ran by track scales 50% rear and about 51%cross. i also ran hossiers and 8" racing wheels last year running in the ss class.

------------------
Currently looking for sponsors for the 2004 race season if interested please
email me or drop a pm

racer17j
Dirt Forum Champ
Total posts: 5390
posted December 26, 2003 09:27 PM  
6800-7000 will be to high. my valves float at 6800. cam is good to 6500

82-84 roll out is what i will be using but need to keep the r`s around 6000-6500.
what would my r`s be with 5.42 or 5.67 gears?

racer17j
Dirt Forum Champ
Total posts: 5390
posted December 27, 2003 10:35 PM  
With a 'glide you can run a 3.41 rear for a 6.00 if it's a 1.76,or run a 3.30 gear for 5.80.

Raz_900
Dirt Forum Champ
Total posts: 635
posted December 29, 2003 08:18 AM  
I wouldn't get too concerned with how high you rev the motor. It's all in where your motor is tuned to run. With 86" tires, I ran a 5.67 on a 4/10th-7/16th track turning around 6200 in high. I wouldn't run in low unless it's a really short straightaway track, or you want to give up the advantage of the 'glide on restarts. If I'm near the front, the auto is worth at least 2 car lengths on every restart, even over cars with 40-60hp more than me. Not matter how fast your left leg and right arm can move, I can click the shifter faster.

FWIW, I'd start with the 5.83s or maybe the 5.67s and go from there. On the last weekend of the season here, I ran against cars spinning over 7500 and some up near 8200 with my cracked block, overheating, water using stock rod & stock crank 355 spinning 6300 and held my own.

I agree with the spring rates mentioned above. My cars about 200lbs lighter, but I've run all those springs in the past. Just depends on what track it's on. The only thing I'll add is to try and find a front sway bar from a SS or LS. They're 1 1/8" I believe versus 1" on the rest of the cars. I lost my LS in a nasty accident in July and replaced it with a standard piece. The front felt a little mussy after that and skated the right front. So I'll either be getting another bar or upping the right front spring a bit (at 1100 now)

Back to the Archives