1/4 mile not making sense?? Help!

[Bwinkelsas]

Originally Posted by Roushturboedzx3

Bogarts do fine on the roads ;)

speaking from experience much?

[AllOutZX2]

Originally Posted by Roushturboedzx3

Bogarts do fine on the roads ;) stay away from pot holes

Gah...Pot Holes... I just ordered a replacement Rota Slipstream, A Pot Hole Bent it out of shape pretty good but I was doing 80 when I hit it lol.

THanks for the feedback on the tires!

[Roushturboedzx3]

Originally Posted by Bwinkelsas

speaking from experience much?

haah

Originally Posted by AllOutZX2

Gah...Pot Holes... I just ordered a replacement Rota Slipstream, A Pot Hole Bent it out of shape pretty good but I was doing 80 when I hit it lol.

THanks for the feedback on the tires!

My steel slick wheels should never bend, a reason why i bought them

[AllOutZX2]

Originally Posted by Roushturboedzx3

haah



My steel slick wheels should never bend, a reason why i bought them

With the amount of power you make having a heavy steel wheel is not an issue lol. On my end of town I needed the lightest wheel possibly they make. Running on just motor :) Actually the Boggarts weigh in around 7lbs and the M&H weigh in at 16lbs, so 23lbs total weight. I know alot of street tires that weigh 23lbs alone.

My current street set-up is 16" and weighs 34.5lbs(13.5lbs Rota's, 21lbs Kumho's.

[Roushturboedzx3]

Originally Posted by AllOutZX2

With the amount of power you make having a heavy steel wheel is not an issue lol. On my end of town I needed the lightest wheel possibly they make. Running on just motor :) Actually the Boggarts weigh in around 7lbs and the M&H weigh in at 16lbs, so 23lbs total weight. I know alot of street tires that weigh 23lbs alone.

My current street set-up is 16" and weighs 34.5lbs(13.5lbs Rota's, 21lbs Kumho's.

I dont even wanna know what my street tires weigh. there Enkei mm2 with 245/45/17 Nitto 555r dragradials im sure they weigh a ton lol

[AllOutZX2]

Originally Posted by Roushturboedzx3

I dont even wanna know what my street tires weigh. there Enkei mm2 with 245/45/17 Nitto 555r dragradials im sure they weigh a ton lol

245's? wow I guess the Focus Wheel well has more room then the ZX2. 215 Seems to be about the max width before we need to start rolling the rear fenders.

[Roushturboedzx3]

Originally Posted by AllOutZX2

245's? wow I guess the Focus Wheel well has more room then the ZX2. 215 Seems to be about the max width before we need to start rolling the rear fenders.

I rolled the inner lip on my fenders

[AllOutZX2]

Well Back on topic, 92-93MPH the car has power to do a high 14, low 15.

[iminhell]

I made some graphs.
Use the equation listed by the line to get exact numbers.
The graphs are Time on the up axis and RPM on the horizontal ... as RPM goes up time goes down, which is obvious.
The graph is figured by,
- finding the MPH vs gear ratio and tire diameter
- converting that # to Feet Per Hour, multiply by 5,280
- convert that # to Feet Per Second, divide by 3600
- divide 1,320 by ^ and you get the time it takes to reach the end of the 1/mile, if at a constant RPM


22" tire:




26" tire:





22" MPH and RPM drop:





26" MPH and RPM drop:




If I shift @ 8,000,
2nd drops to 4,700
3rd drops to 5,500


So I'm really/still confused on why a smaller tire supposedly gives a better time. By everything I can figure a taller tire should be faster providing the car has good power above the rpm each shift drops too ... in my case I need good TQ up high.

[Roushturboedzx3]

Originally Posted by iminhell

I made some graphs.
Use the equation listed by the line to get exact numbers.
The graphs are Time on the up axis and RPM on the horizontal ... as RPM goes up time goes down, which is obvious.
The graph is figured by,
- finding the MPH vs gear ratio and tire diameter
- converting that # to Feet Per Hour, multiply by 5,280
- convert that # to Feet Per Second, divide by 3600
- divide 1,320 by ^ and you get the time it takes to reach the end of the 1/mile, if at a constant RPM


22" tire:




26" tire:





22" MPH and RPM drop:





26" MPH and RPM drop:




If I shift @ 8,000,
2nd drops to 4,700
3rd drops to 5,500


So I'm really/still confused on why a smaller tire supposedly gives a better time. By everything I can figure a taller tire should be faster providing the car has good power above the rpm each shift drops too ... in my case I need good TQ up high.

The problem is you dont have the power near enough to run a 26 tire. i promise you a 22in will be all you need. remember you need to have enought power to get out of the whole too.

Take bryan focus as a example stock duratec with header and intake and 75shot. he used my 24.5 tire at 14psi (alot for a slick) he had to launch off the limiter 7100 and the spray to avoid bogging it. he is also on standard 3.82 gears, he has a set of 23in slick on it now and he cant get out of the whole without bogging off the bottle and that from a 7100rpm launch.

Your example has the real world factors that are not in there. gear ration, tire pressure, width of slick, etc. a smaller tire acts as a shorter gear ration effectively getting you to the line quicker. but there a point where to small wont work, which is why there are diff size slicks.