Just wanted to throw this out there and get some feedback:


If money, time, and fabrication were no object (like in all of our dreams lol) what would you do to increase your mph at the traps:

Keep the same final drive and upsize your tires

;or:

Lower your final drive and keep the same tires


Any what and why's or links to other threads would help!

thanks!

 

i guess if you are making power, you will need the sidewall for traction, (i.e. tire height)

so i guess my thoughts would go towards final drive or custom gear 1-4 set.

 

What are the incrementals? 60', 330', etc. Are you breaking tranny parts? What does the car weigh? No simple answer without all the variables.

 

Well, this isn't about a specific car persay, but more about theory and trying to learn how to make proper decisions.

What would be better to increase you 60'? or 330'? are we talking et or MPH?


What are the advantages/disadvantages to running more or less side wall? How much sidewall is too much sidewall?

What would put more stress on the tranny?

NA VS. Boost VS. NOS What factor does torque / and rpm range of power band play on this selection?

How does weight affect your decision?


I'm not looking for a simple answer, I'm looking to pick the brains of some of the brilliant tuners on here

 

Anyone??

 

if money were no object than I would try both.

 

Man this is a great question and one that should be easily answered. But it isn't!

There are some general rules, it seems from your questions you understand them. If I was testing to see what helped my car most i would do my best to source some different diameter tires and starting from largest to smallest would make three runs each. From there you can equate what you would need as far as a final drive to run a specific diameter tire. You might find that on a 26" tire you bog horribly and the car doesn't make any MPH with a slower ET. Switch to the 24.5 and then to a 23. At some point you will gain ET and loose MPH. This should point to a balance.

What's most important to me lately is that is works, not what it is...

 

After talking to some racing buddies who have varied backgrounds I got a few more insights into this.

A larger tire (even if its just height) will always have a larger contact patch, weather longer or wider, therefore, will offer more traction.

More sidewall = more flex = less chance of wheel spin and better launch due to smaller rollout distance (diameter) under flex.

A larger tire will expand more at speed and give you a longer rollout (larger diameter), giving you longer legs at the end of the track.

A lager tire will also give you more unsprung weight, putting more load on suspension components and drivetrain.


Does this sound right to you guys?? Makes sense to me

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by logg_frogg &raquo;</TD></TR><TR><TD CLASS="quote">Makes sense to me </TD></TR></TABLE>

Me too. Now the only thing you need is to find the right diameter to match you power level and so on. Even if you raise a F/D to 4.25+ a larger tire won't be ale to help you if you only have 200Wheel.

 

Anyone have anything else to add??