i want to hit 13's this season really bad i ran a 14.409 @98.01 at bandimere elevation 6200ft i will be able to make it to the track one more time this season the track will be like 4200ft so that should help but i was going to get drag radials and i was thinking about tire size if i went with a bfg drag radial(track use only) on a 14 inch rim with a 45 series instead of a 60 sidewall and 225 wide that should lower my 60ft times and and give better acceleration right?

 

Well the smaller aspect ratio will make the overall gearing slightly shorter as well as decrease the weight of the tire itself...slightly. However, the sidewall won't flex as much as a 60 series would so traction might suffer. Not even sure you need a 225 for drag (are you making that much power?), as the wider you go, the more drag and weight.

 

In theory, smaller diameter wheels will increase acceleration at the expense of top speed.

I've run a 13x8" wheel with 235-50-13 tires for autox. The combination of stickier compound, increased width(+2") and smaller diameter(-.5") make for insane hookup. Even with a pretty high RPM clutch drop, there is minimal wheelspin.
I've never taken it to the strip but if I did, this is what I would try first.

 

really how would my top speed suffer i would assume it would have been higher. i need the added traction because of my 75 shot it just tears the tires loose in 1st and 2nd

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sloweredcivic &raquo;</TD></TR><TR><TD CLASS="quote">really how would my top speed suffer i would assume it would have been higher. i need the added traction because of my 75 shot it just tears the tires loose in 1st and 2nd</TD></TR></TABLE>

Use the shot in 3rd+.

http://crx.honda-perf.org/math/index.html

Transmission calculator.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LaFawnduh &raquo;</TD></TR><TR><TD CLASS="quote">Use the shot in 3rd+. </TD></TR></TABLE>

Spray right out of the hole if traction permits, which you should be able too with the right tire...otherwise its just a waste.

 

That tire is only 3/4 of an inch shorter than stock. Get it, should work great.

 

that is why i want drag radials so i can spray all the way through and i was hopeing that widening the tire would help with shortening it

 

do you have a calulator for the jdm ys1 with oem lsd if that makes a difference

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sloweredcivic &raquo;</TD></TR><TR><TD CLASS="quote">that is why i want drag radials so i can spray all the way through and i was hopeing that widening the tire would help with shortening it</TD></TR></TABLE>

no, WIDEening the tire will not change it, its how tall the tire\rim is.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sloweredcivic &raquo;</TD></TR><TR><TD CLASS="quote">that is why i want drag radials so i can spray all the way through and i was hopeing that widening the tire would help with shortening it</TD></TR></TABLE><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LaFawnduh &raquo;</TD></TR><TR><TD CLASS="quote">no, WIDEening the tire will not change it, its how tall the tire\rim is.</TD></TR></TABLE>

I think he meant that widening the tire will give him better traction which it will. And in turn make his 1/4 times drop.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by g-ride-si &raquo;</TD></TR><TR><TD CLASS="quote">I think he meant that widening the tire will give him better traction which it will. And in turn make his 1/4 times drop.</TD></TR></TABLE>

ahhhhh got it.

 

exactly!!!

what is the difference between the usdm ys1 and the jdm ys1

 

Like the people so far have said, changing your tires to a smaller size will increase acceleration but also keep in mind the weight of the tires.

If the tires are heavy and more weight are on the outside of the whole wheel then you would need more force than if more of the weight was concentrated towards the centre of the whole wheel.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sloweredcivic &raquo;</TD></TR><TR><TD CLASS="quote">really how would my top speed suffer i would assume it would have been higher. </TD></TR></TABLE>

Thats physics...don't look at me, I don't make up the rules.
Think about a 3 speed bicycle...gear one is easy to pedal, even on steep incline, but it doesn't go very fast. Gear three is harder to pedal on anything but a flat surface, but it has the highest top speed.
Look at the actual diameter of the gears on the bike...gear one is smaller then gear three. See where this is going..?

 

Davens stated it pretty well.

Essentially the engine has an easier time pushing lower(smaller) gears than higher(bigger) gears. If your car didn't have a redline we'd all be pushing an ideal single gear, but it does and this redline limits the amount of speed you can travel based on the gear in a given rpm range.

Fun stuff, gear ratios and all, I considered it an overlooked option when people start to go fast.

 

so do you think this would help with at least a tenth or 2 i think that is all need with the altitude change in the tracks.

 

There are 2 YS1 tranny's that were made for the NA market; the LS YS1 which has long gear ratios and the short-gear YS1 made for the rare B17A. None of these came or had an LSD option. In Japan however, there version of the YS1 has the exact same short gear ratios as the B17A motor in the US BUT had the option of an LSD.

 

Dont think the altitude change and smaller tire size would get you in the high 13's

What tires were you running before on your 14 sec run?

 

nitto neo gens i think the elevation will help alot altitude corrected i ran a 13.8 at sea level