knockin on the 13 sec. door...
10-12-2002 | 05:10 PM
#3
I hate the Mets
Joined: Jun 2002
Posts: 4,994
Likes: 0
From: Philly Burbs
What could you have done to lower that time even more??? I know you have the weight reduction--and the basic other mods- ( I/H) and pullies if Im not mistaken---So what else you gonna do to break into the 13's? Or do you think it is a matter of environmental conditions and driving?
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10-12-2002 | 05:41 PM
#10
Suzuka Master
Joined: Nov 2000
Posts: 7,388
Likes: 1
From: Ninth Gate & So Cal
Originally posted by mattg
the 50 degree temp. helped i'm sure. spare, jack were removed.
i still don't have my alt. pulley installed
light weight wheels should yield high 13's.
the 50 degree temp. helped i'm sure. spare, jack were removed.
i still don't have my alt. pulley installed
light weight wheels should yield high 13's.
The car seems to "like" the weight drop and it feels like dumping a passenger out the window (prehaps you can find a buddy to toss out the window during a run for timing purposes [j/k])
The ligher and stickier rubber would drop your 60' times and the wheels would amplify the effect of the pulleys...
BTW, a superglue gel formula applied to upper and lower teeth can make any diet a "sure thing" and you could go for the "skeleton drag racer look" too...
Nice job!
10-12-2002 | 06:15 PM
#17
Suzuka Master
Joined: Nov 2000
Posts: 7,388
Likes: 1
From: Ninth Gate & So Cal
BTW, if you have the barometic pressure too (or just toss in a 30 if you don't know), you can correct to standard conditions
http://www.prestage.com/carmath/calc...o_standard.asp
http://www.prestage.com/carmath/calc...o_standard.asp
10-12-2002 | 07:04 PM
#25
Suzuka Master
Joined: Nov 2000
Posts: 7,388
Likes: 1
From: Ninth Gate & So Cal
Originally posted by Nashua_Night_Hawk
so you have more rveroultion per mile....? than stock... does this insrease torque to the wheel? I guess so...
so you have more rveroultion per mile....? than stock... does this insrease torque to the wheel? I guess so...
There's also the issue of lighter weight too. The weight of a tire is generally concentrated at the tread (steel belts, etc). If you move that in, you are altering the rotational inertia by the square of the radius. So, you get:
1. Increased torque from an effectively lower overall ratio.
2. Less weight in tire
3. Less weight at outside of tire.
4. Highest concentration of weight is moved in a bit and effect is nonlinear (it's r^2)
One day, it would be nice to see someone make a machine with a strain gauge and an electric motor that rotated wheel, tire, and/or wheel/tire combos from 0 to xxx RPM to come up with a "standardized" moment of inertia figure to allow people to compare different wheels and tires and wheel/tire combos on various web sites.
10-12-2002 | 07:25 PM
#26
shooting for 1200+rwhp
Joined: Apr 2001
Posts: 1,045
Likes: 0
From: NC
MattG...congratulations....i plan on being in the 13's in about a month....with that trap speed, you should be able to pull it off, maybe one or two more mph and you should run a 13.9....we'll see who get's there first
10-12-2002 | 08:05 PM
#27
Evil Bob Knieval
Joined: Jul 2001
Posts: 2,386
Likes: 7
Originally posted by mattg
comptech headers, exhaust
aem cai
ur pulleys, alt. pulley not yet installed
koni yellows
kumho 712, 235/40-17
comptech headers, exhaust
aem cai
ur pulleys, alt. pulley not yet installed
koni yellows
kumho 712, 235/40-17
hmmmmm not bad at all
10-12-2002 | 11:28 PM
#36
Lead Footed
Joined: May 2001
Posts: 3,415
Likes: 15
From: Plano - Texas
Originally posted by EricL
Yes, it really does help... It's like putting in a different (lower) set of rear end gears.
There's also the issue of lighter weight too. The weight of a tire is generally concentrated at the tread (steel belts, etc). If you move that in, you are altering the rotational inertia by the square of the radius. So, you get:
1. Increased torque from an effectively lower overall ratio.
2. Less weight in tire
3. Less weight at outside of tire.
4. Highest concentration of weight is moved in a bit and effect is not linear (it's r^2)
Eric, you are really too much!
Some folks might have thought me nuts, but I spent weeks of research on various tires and wheels. The whole point was trying to achive better traction, reduce wheel and tire weights, and maintain as much a balance as possible.
The result was 18.2lb wheels, 20.8lb tires, a 1/2" less dia and slightly wider tire. All this resulted in my 0-60 time dropping by 4-tenths. So my total weight reduction is 8lbs, plus considering the slightly smaller dia and wheel design that puts more weight to the center of the wheel.
No other mods were done, tested at the same place, weather similar, etc.
The only downside are the dia issue and dirty air filter. To compensate for the dia difference, I took it to about 61MPH.
So not exact science, but pretty close.
RUF
One day, it would be nice to see someone make a machine with a strain gauge and an electric motor that rotated wheel, tire, and/or wheel/tire combos from 0 to xxx RPM to come up with a "standardized" moment of inertia figure to allow people to compare different wheels and tires and wheel/tire combos on various web sites.
Yes, it really does help... It's like putting in a different (lower) set of rear end gears.
There's also the issue of lighter weight too. The weight of a tire is generally concentrated at the tread (steel belts, etc). If you move that in, you are altering the rotational inertia by the square of the radius. So, you get:
1. Increased torque from an effectively lower overall ratio.
2. Less weight in tire
3. Less weight at outside of tire.
4. Highest concentration of weight is moved in a bit and effect is not linear (it's r^2)
Eric, you are really too much!
Some folks might have thought me nuts, but I spent weeks of research on various tires and wheels. The whole point was trying to achive better traction, reduce wheel and tire weights, and maintain as much a balance as possible.
The result was 18.2lb wheels, 20.8lb tires, a 1/2" less dia and slightly wider tire. All this resulted in my 0-60 time dropping by 4-tenths. So my total weight reduction is 8lbs, plus considering the slightly smaller dia and wheel design that puts more weight to the center of the wheel.
No other mods were done, tested at the same place, weather similar, etc.
The only downside are the dia issue and dirty air filter. To compensate for the dia difference, I took it to about 61MPH.
So not exact science, but pretty close.
RUF
One day, it would be nice to see someone make a machine with a strain gauge and an electric motor that rotated wheel, tire, and/or wheel/tire combos from 0 to xxx RPM to come up with a "standardized" moment of inertia figure to allow people to compare different wheels and tires and wheel/tire combos on various web sites.
