stealth1281

I recently had my car tuned and the majority of the power is top end. I currently have MT ET Streets 275/60/r15 and they are too tall. I have 4:10's and I'm shifting into 4th right before I hit the quarter mile mark.
I'm in the market for new tires, and any tire size suggestions would be greatly appreciated.

stealth1281

It's also a 6-speed. Ideally, I want to hit the quarter mile mark at the top of 4th and I'm just trying to figure out what size tire will allow me to do that. What I have now is overkill.

mikh338

iTrader: (16)

how much power is the car making? im in the same boat as to what size tires to buy for the rears on my new drag setup. im at 26" now in the rear with 4.10s and 440whp 6 spd. been wanting to step up to a 28" tire to fill my wheel well but dont want it to effect the 1\4 time negatively

stealth1281

That's a good question. I never had my car on a dyno. I was running 12.3's at 115 before my motor rebuild. That was with my current 28" tires and I was crossing the 1/4 mile at the end of 4th, which was ideal. Now, my car has much more top end power and my tuner told me a smaller tire would help my gearing out. He just didn't know what size to go with.

mikh338

iTrader: (16)

alright now im confused. in your first post you said you were just shifting into 4th at the end of 1/4 and your last post said tou were in the end of forth?

stealth1281

Sorry for the confusion, but if you read carefully, I stated in my last post that I was crossing the 1/4 mile mark at the end of 4th BEFORE my motor was rebuilt.

mikh338

iTrader: (16)

ohhhh ok i see that now sorry. what are your mods so we csn guess a power level? after entering all my info into the gear and tire calculator i think i should stick with a 26"-27" tops for my car to be innthe range i want in the end of 4th crossing the 1/4

stealth1281

Here are my mods:

6.0 built iron block engine bored over and with flat head pistons
l92 heads that were professionally CNC'ed and ported
90mm tb
90mm MAF
42lb injectors
cam (232/238)
lt headers, ORY, Borla catback
built tranny
steel driveshaft
4.10's
sfc's
ford 9" moser rearend
15" rims
More, but can't think of them at the moment...

What gear/tire calculator did you use? Thanks

mikh338

iTrader: (16)

let me know how those ported ls3 heads work on your motor. ive been told a few times they will not work well with a motor of our size so im interested to see how the car runs and what it makkes for power once its dynoed. but here is the site for the calculotar. just make sure you put in the 4th gear box the ratio of 1.00 and then you can enter different tire sizes and your rear axle ratio.
http://www.f-body.org/gears/

stealth1281

From my research and asking around, the l92 heads work quite well with the 6.0, but not with the 5.7. Thanks for the link by the way!

mikh338

iTrader: (16)

np man, deff wanna see what the car makes with your setup, when are you having it tuned?

stealth1281

Actually, the car is already tuned with hp tuners.

mikh338

iTrader: (16)

track times then haha

stealth1281

I'm stuck at 12.4-12.7 because I have to shift into 4th right before the 1/4 mile, thus the reason I started this thread lol

mikh338

iTrader: (16)

deff go to a 26" tire