Pure Stock Drag Racing tips & tricks

**YENKO DEUCE REGISTRY** · #1 01-10-2003, 11:43 AM

I'm not sure that I understand how the lower rear tire pressure would cause the car to launch 'crooked'?? I thought the tire would 'flatten out' a little bit as it absorbed the initial 'shock' and thereby give a little better launch because you could hit the tires with a higher RPM?? Remember, this is completely new to me!

Casey Marks · #2 01-10-2003, 01:29 PM

Similar to Rob....

I run 48 psi in the front, and 44 psi in the rear. I've found that is where I get the most consistent contact patch for the tire in the rear.

If you put in the 32 psi recommended pressure, and do a quick blip in your driveway (OK - I do them in my driveway ......) anyway - - - you'll most likely find that you will see the outside edges of the tread making the darkest contact, and the inside 4 inches or so of the tread will be a simple *wisp* of black. As you air up the tire, the distance of the dark patch should get closer and closer, until you have a nice flat contact patch across the entire tread width of the tire. If you look at a Polyglas, there really is quite a bit of rubber that makes contact - as long as it ALL is making contact. Also, it seems to be fairly agreed upon by the Pure Stock guys that the more *seasoned* tires actually get BETTER traction with use. READ: DO LOTSA BURNOUTS to season them !!!! [img]/ubbthreads/images/icons/smirk.gif[/img]

Chevy454 · #3 01-10-2003, 04:47 PM

Marlin:

It wasn't that it "launched crooked", but the wheelspin got pretty bad...I pedaled it for a ways down the track, but when I got back into it, mayhem ensued! Luckily I can't leave off the converter anyway, so I was leaving pretty much from an idle, but it still spun it sideways HARD. It was probably a good run to WATCH, but made for a terrible ET/MPH!

**YENKO DEUCE REGISTRY** · #4 01-10-2003, 05:08 PM

I seee....

**Salvatore** · #5 01-10-2003, 10:12 PM

Marlin, A bias tire reacts different than a radial. (obviously) When air pressure is low it causes the bias tire (also Radial) to react like it is flat. You feel like you are getting a flat tire and the car vears all over the road. You need to do a burn out and see how the tire is planting itself. Look at the marks and see if you have a full tire width on the ground. If not, add or subtract air till you like your burn out marks. If the tire pressure is too low you could possibly spin your tire in its rim. It is trial and error, but we have faith in you. Just don't be upset if the car doesn't get out of the mid 14 teens set up like that. I can see day 2 is just around the corner! Ha-Ha Sam

**SmallHurst** · #6 01-23-2003, 12:43 AM

Casey,
It seems that I am chasing you around. Maybe I can keep you from getting in trouble (not). I was needing to talk with you about a driveshaft loop. Can you reply to me here or send me an e-mail. To everyone else, Hi! [img]/ubbthreads/images/icons/grin.gif[/img]

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