i have a five speed, and i am running 15" M and H slicks, 6 x 26. last time at the track, someone said "26 inches, that a tall tire" so i was just wondering, do you think that it is too tall? should i go for a smaller diameter? i dont even know if there is one that would fit.

doesn't the fact that it is large in diameter make my acceleration lower but my top speed higher?

 

are you auto or manual?

how much power are you trying to apply through those 26s?

 

He is 5spd. Try a 23-24.5" slick.

 

damn. i asked and asked on here before i bought them and that is the size everyone recommended.

i have intake, y-pipe, muffler, UDP.

 

here we go again... the reason everyone recommended it is because the wheel you said you were using was too skinny to run any other slick... if you are going to limit yourself to wheel sizes you are going to be limited on the tire size you can put on those wheels. you are using a 15x6 or 15x6.5 right? well that means you have one of TWO choices for slicks, M&H 7.5x23-15 or 6.0x26-15. 23" is FAR too short for a 5 speed, it will force you to shift into 4th and an extra shift = time wasted, 26" is a bit tall for your current power level but it leaves you room to improve when you are putting down more power, and it makes it so you dont have to shift into 4th.

 

I dont think you should have slicks at the point your at . I would not risk my drivetrain unless i was going to run a low 13 or a high 12 with them. My opinion.

 

wow neal, do you just not like me or something? it seems like every time i post something, you complain because i have already asked or it has already been discussed. i saw your response to my other post too. sorry to ask the same questions, i just don't know myself, and was wondering.

i have no idea how to figure what diameter tire to run for any given horsepower or transmission. i really dont know. like how you say 23" is far too short. how do you know that? is there a formula or something? if you could point me to a resource for that info, i will gladly stop bugging you guys.

also, i was reading on another post that shifting into fourth was actually getting some guys better e.t.'s. is that not true?

 

I doubt it's anything personal.

I remember when you were asking questions on which slicks you should buy. You told us what size rim they were going on and we have you the two options you had, the taller slicks being the better of the two considering you car and mods.

So why the confusion now? Because some guy at the track said they were tall??

Changing the diameter of the tire will change your gearing. The shorter the diameter the slower you will be going at a given rpm in any given gear.

 

yeah pretty much. what a jerk.

 

I'm sorry for the way my post was worded, I was having a bad day yesterday
and I did word it a little harshly, however if you recall you did ask
basically the same question back in march or so, and I gave you basically
the same answer. You've asked quite a few questions which were seeking
basically the same info, since I know firsthand about the use of slicks, I
feel compelled to answer, but sometimes it feels like you are asking the
same question more than once and I think to my self "did this guy just
ignore what I said on the last thread he asked about this?"

Don't take this as a personal attack on you or anything, There is alot of
redundance on this board (mostly questions about MEVIs and ECUs) that I
answer with the same answer each time, and then 4 days later someone else
asks the same question and it gets frustrating. The only reason I sortof
took it out on you is because I knew you had asked before about the sizing
of slicks, and I knew I had answered it before. Sorry.

As far as formulae to calculate the optimal tire size, yes there are some
out there. They are quite complicated though, and it's easier if you get a
program which has them already programmed in and you can just input the
parameters and it will show you the results. One such program is CarTest.
It's a very easy to use and very accurate vehicle acceleration simulator.
SteVtec and myself use it extensively. You can alter just about any
parameter about your car you choose to, including tire diameter.

I'm about to leave work so I have to log off this computer. When I get home
I will either send you a PM or post again here if you'd like to go into
greater detail as to why I suggested you go with a 26" slick rather than a
shorter slick. In a nut shell though I advised you to go with 26" slicks
so that you don't "outgrow" them and need a different size next year when
you are making more power.

 

oh. ok.

 

>>Changing the diameter of the tire will change your gearing. The shorter the diameter the slower you will be going at a given rpm in any given gear.<<

Uh, excuse me, but isn't it the EXACT opposite? Smaller tires give you more acceleration but limit your top speed.

 

no. if you are at 3000rpm in 5th gear with a 22" tire you are moving slower than you would be if you had a 26" tire and are at 3000rpm in 5th gear. he wasnt talking about acceleration.