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SillyOne
Dodge Dakota
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12/05/2002
13:11:32
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 Subject: Idea of what I'm about to gain?
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My truck, a 2000 CC 4.7L, with 3.55 open diff in rear, on some Kumho 215/75/15's, and with just tailgate removed and 360airintakes 4.7 setup added, ran a 15.5 at the track.
My LSD should arrive today, and 3.92 gears next week or the week after. With the new gears, and LSD, and after removing the clutch fan, and the spare (as well as the tailgate again) is it totally out of the question to expect breaking into the 14's this time, what do you guys think?
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.alex.
Dodge Dakota
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12/05/2002
13:31:14
| RE: Idea of what I'm about to gain?
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What were your 60' times on that 15.5 pass?
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SillyOne
Dodge Dakota
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12/05/2002
13:39:12
| RE: Idea of what I'm about to gain?
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2.333
1/8 mile was a 9.883
I was launching VERY easily, no traction at all practically
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.alex.
Dodge Dakota
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12/05/2002
13:54:20
| RE: Idea of what I'm about to gain?
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Okay, so let's say you add the limited slip 3.92 ratio and you are able to modulate the clutch (is yours a 5 spd?) and you get yourself a 2.1 short time. That's .2 off in the 60' and approx .4 off in the full 1/4 mile. Now you're at 15.1, but you are going to free up the 5-7 hp from the clutch fan. And you will be removing another 50 lb worth of spare tire. I think you stand a fair chance of seeing a 15.0 or a 14.9 somewhere in there. Just let your rear tires down to about 26-28 psi and don't do a huge burnout.
If you can swing it, get some 275/60/15 tires for the rear and you'll get about another 1-2" of footprint when you air them down. The Firestone Firehawk ss20's are about $55-$60 a piece. That's what I run on the street.
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Waltherone
Dodge Dakota
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12/05/2002
19:43:58
| RE: Idea of what I'm about to gain?
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Nah I'm not gonna die if I don't hit 14's
I'm about to buy a guy's 16x8 wheels with some 75% tread Goodyear 255/60/16's so I don't want to spend the cash (which I'm short on kind of) on tires just for a track run.
It's an auto by the way so I guess I can prolly rule out 14's for my next run :)
Thanks though!
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Waltherone
Dodge Dakota
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12/05/2002
19:45:25
| RE: Idea of what I'm about to gain?
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Err by the way, I am "sillyone" I was telling my sister to post that cuz she wanted to type, and she decided to be a lil prick..
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Waltherone
Dodge Dakota
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12/06/2002
01:19:08
| RE: Idea of what I'm about to gain?
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by the way, why NOT do a large burnout?
Forgive me but I'm a bit new to the track world, but I would have thought it would help more to do a longer one. I'm about to junk the tires anyway, if that's any matter at all?
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dragrdan
Dodge Dakota
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12/06/2002
03:49:58
| RE: Idea of what I'm about to gain?
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because street tires(and slicks for that matter) get greasy if they get too hot. slicks can handle the burnout a little better. for street tires avoid the water box(if at all possible), the water will stay in the tread while spinning and dribble down to the track under your tires when you sit still(stage). a short dry burnout just to clean off the tread usually worked best for me.
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.alex.
Dodge Dakota
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12/06/2002
07:42:55
| RE: Idea of what I'm about to gain?
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The rubber compounds in slicks are different from the compounds in street tires. When you do a huge burnout on street tires, the rubbre comes off in little balls and wormy looking things. These stick to the treads of a street tire, but they are easily "rolled" off the tread with your bare hand. Well, when you pull to the line with all these little rubber marbles on the tread, it is indeed like trying to launch while sitting on marbles.
A huge burnout with slicks or DOT tires produces rubber that's more like rubber cement. This makes for nice black-ass stripes on the street and some really sticky launches on the track. Next time you are at the track, go over to someone's pit that has slicks and has raced that day. Ask if you can put your hand on the tire... and when they say, sure, wipe off the rocks & debris and put your palm flat on the surface. It's verry sticky. You can do the same on a street tire and it's just kinda hard.
So, a big burnout with street tires is actually hurting your launch quite a bit. Just do a short burn to haze the street tires (if you even do that much). Then pull up and stage. It also helps to have the rear tires down to about 28 psi. You can also pump up your fronts to 50 psi for the day. Be sure to air them down before you leave the track....
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big_torque
Dodge Dakota
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12/06/2002
09:36:18
| RE: Idea of what I'm about to gain?
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I agree on the smaller dry burnout. Worked better for me and my MT ET streets. So who gets the best benefit from going in to the water box ? The guys with the huge ,wide slicks ?
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.alex.
Dodge Dakota
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12/06/2002
11:44:15
| RE: Idea of what I'm about to gain?
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Yes, they are the ones who need the water box. If you have a high horsepower motor and sticky tires, and you don't prime them with a little water, one of two things will happen:
1. You will twist the axles until they break. Bad.
2. You will only spin a little and may actually pull a lil ol' wheelie (only the Top Fuelers and NMCA cars etc). Then the tires will still not be hot enough and when you launch with full power, the slicks will not be very effective.
So the only guys that really need to go thru the water box are the ones with the skinny no foot-print front tires and huge wide big meat slicks in the rear.
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