RsSean

iTrader: (27)

I am running a 28x11.50x15 inch tall tire and a 3.90 rear gear thur a 6 speed. I was looking and buying some tires for my Prostars, 15x 3.5 but hell they go from 22in to 27.5 does that have dastic effect on ET?

Can someone shine some light in that area for me.

Thanks

blackls1ta00

iTrader: (27)

im wanting to know the same,good question!

tektrans

iTrader: (23)

The bigger the front tire the further the car can roll past the beam before tripping it and starting the clock. A little "rolling start" so to speak. So you will ET quicker with the bigger tire.

RsSean

iTrader: (27)

A taller tire is a heavier tire, I see what u mean tho roll threw the beams a little bit kinda like a staggered front wheels on a jr dragster

Coach 02 A3 Z/28

iTrader: (10)

IMO-Picking a front tire depends on what kind of racing you will be doing.

On my car, I run 28's on the front for bracket racing on a .500 tree. I use 26's if running a Pro .400 tree.

These 2 types of racing are won/lost at the tree.
PS. (I know you have to run the top end also but that is for another post)!

Coach

MUSTANGBRKR02

iTrader: (91)

28's require some fender modification also correct?

tektrans

iTrader: (23)

Coach is KING here!

RsSean

iTrader: (27)

Its a street strip car that normally runs a on a strandard tree.

I was thinking a either 26 or 27 inch tall tire now. Do the slicks being a 28, and the street tires being 26. So where in there so the abs and TCS dont have heart attacks

JL ws-6

iTrader: (50)

Hoosier sells a 27 inch tire. I put a set on my car to try to help prevent redlighting on a 400 tree.

With about 600 rwhp, I was getting a little too close to red lighting, and doing it a little too often... when the car's back together with probably 900 rwhp I know it's going to react alot faster, so I went with the 27 inch tire.

I also had the spindles built with 1.5 inches of drop in them to compensate for the added tire height, and the front end, as already mentioned can be done. My k member was was built with about a 1/2 inch of stagger in it, left front came forward about 1/4 of an inch, right front went back about 1/4 of an inch. Again, to get the car a little bit of a rolling start to help with ET, and to help prevent the red lighting. The class I want to run, you need to be able to run .01x lights on a consistant basis off a 400 tree, if you want to win, fwiw.

The 28 inch tire, will require that the fender liners be removed, and it may, still rub depending on how much travel the car sees. 27, you probably should take the liners out, but if you don't have alot of front end downtravel happening, it should be o.k. 26 inch tire you can leave all that in if you want the only way it's rubbing is if you bottom the car out.

Hope this helps...

oChristiano

iTrader: (6)

Can someone explain alittle more in depth what front tire height has to do with ET/RT besides bigger weighing more? Only thing I can think of is taller front tire would change the stance of the car and effect weight transfer maybe?

JL ws-6

iTrader: (50)

Let me try to explain.

Take 2 pens, put them on a table, about 1/2 an inch space between them. Take a small can of soup, lay it on it's side, look at the pens from the end (so you can see them as 2 round circles). Roll the can until it's blocking your view of the pens. Now, look at how much movement you can get out of the can before you can see the pens.. not alot. Now, get a coffee can, and do the same. Notice you can roll that alot more and still not see the pens?

The effect, is that you can hit it, and as the car starts moving the beams are still broken at the track and the timer hasn't started yet. This effectively is giving you a rolling start to your run before you actually start the timers.. hence reducing the time that you're on the timer, reducing ET.

If you build an offset into the front end, so one tire is farther forward by an inch then the other, you get a little more of this. It's not legal for some classes, other classes they won't really check for it. This, increases the effect even further. Essentially, making a 26 inch tire go thru the beams like a 28 inch tire would. Or, if you put a 1/2 inch in like I did, the 27 is going to act like a 28.5 inch front tire or so.

Hope that explanation helps.. I couldn' think of an easier way to simulate the effect with household items.

oChristiano

iTrader: (6)

That actually made alot of sense, thank you for taking the time to explain that to me.

ssdeuce74

iTrader: (2)

yes he's totaly right i put 26in with 15x3.5 on my nova to see if it would be quicker but just ended up making me go red 50% more. i need the 27in for my footbraker