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Racing my stock '68 Dart
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Author:  CARS [ Tue Aug 03, 2010 3:16 pm ]
Post subject:  Racing my stock '68 Dart
I am finally going to Test N Tune this weekend in preparation for Kearney NE on the 21st/22nd.

It is totally stock as most will remember from last year. 13's in the front (too small dia, but it was all I could find in NE at last years race when I had a blow out) 14's in the rear (205/70) with the factory 7 1/4" rear (open) and 904 auto behind a stock 225 Holley 1 bbl.

I can hit the tree real good so I am not worried about roll out. What I am worried about is that at Kearney (and most tracks) they wont let me drive around the water box. I spin the right tire and drag water up to the line with the left. Unbelievably, I can get traction with the right tire on launch and then spin the wet left.

At NE last year someone mentioned lowering the air pressure in one of the rear tires. Which one and does that really work???

Are there any rear suspension tricks that work for one wheel wonders? Or should I just bite the bullet and get a sure grip 8 1/4"??

Any other things you would like to see me try to my 12 second car (1/8th mile :roll: ) ???

How do you guys with automatics do your burn out? Do you just put it in 2nd or do you start in 1st and shift in the water box??

(who knows, if lowering the psi makes a huge difference at the line maybe I wont be able to spin in the water anymore :lol: )
Author:  sergio G [ Tue Aug 03, 2010 8:33 pm ]
Post subject: 
Hi Cris great to hear you are coming. We were all thrown for a loop with the burnouts at Kearney. Most tracks out here do not want street tires in the water at all. I think more pressure on the left tire to try to get it to lock up. Or put air shocks on it and you can play with shock pressure to get more hook. I have even seen guys use different tire sizes try to get the left tire to hook. Its all trial and error.
Author:  Dart270 [ Wed Aug 04, 2010 5:18 am ]
Post subject: 
Air down both rear tires to 20-25 psi (play with it), and you should have no troubles. You could also do your burnout in the water, then stop short of the line and hit it again to make sure left does not spin.

No possibility of binding suspension??

Lou
Author:  CARS [ Wed Aug 04, 2010 6:22 am ]
Post subject: 
Quote:
No possibility of binding suspension??

Lou
Anything is possible. Please elaborate. How do you know and what should be done about it?

When I pre-load the car at the line, the right side squats. When I release the brakes it doesn't raise the rear like it should to plant the tire (tires). I know this is a problem but didn't think it would be an issue in a 12/20 second car :?
Author:  Dart270 [ Wed Aug 04, 2010 6:44 am ]
Post subject: 
I would look at all bump stop and snubber positions on front and rear suspensions, and make sure nothing is in full contact or close to it. If you are resting on a bump stop, or hitting one at launch, that could make a tire spin easily.

Lou
Author:  CARS [ Wed Aug 04, 2010 9:15 am ]
Post subject: 
Thanks Lou. Since I can't launch and look under the car at the same time I guess I will have to steal some playdough from a kid, put a gob on top of the stops and see if I compress the playdough at all :wink:


I would still like opinions on doing my burn out. What procedure do you recommend? Short spins in 1st gear?? High speeds in 2nd???
Author:  Dart270 [ Wed Aug 04, 2010 10:08 am ]
Post subject: 
You need to get the water boiled off and out of the tire treads.

Best to start in 1st gear, shift to 2nd, and make sure you come out of the water and let it heat up. Not sure about the left tire, though...

Lou
Author:  CARS [ Mon Aug 09, 2010 10:27 am ]
Post subject:  Oh no.....
Well, it rained in the morning but still got some passes in. The car likes to be hot so it worked out good because the heat index was just retarded high.

I was going to make a few passes for practice before I started testing the suspension.

My reaction time is still great (at least I am happy with it and stay consistent) but the car.........

It stumbled (like it always does) for the first pass. For some reason that carb likes heat. Anyway... .043 R/T, 2.733 60', 12.19 @ 58.68

That is right there with the hundreds of passes I made at Grove Creek last year. But then each pass just got worse.

12.20's, then 12.30's. 60' were slipping away too. Hmmmmm

I still drove it home. The fluid doesn't smell burnt. In fact it is still nice and pink. I don't see any sparkles. Going to have to look into what the heck is happening. I don't notice any slipping when I punch it on the highway. But, really, how much does a 80 hp engine set you back in the seat????

Can first gear slip and not the other's??
Author:  Dart270 [ Mon Aug 09, 2010 1:41 pm ]
Post subject: 
Why do you think it's the tranny and not just the car heating up and getting out the sweet spot in fuel mixture? Don't see why it would be the trans.

Lou
Author:  66aCUDA [ Mon Aug 09, 2010 7:08 pm ]
Post subject: 
Chris I agree with Lou. Why the tranny?
Frank
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