I was just wondering if my tire size effecting my gear ratio and how bad I'm running a 275/60r15 Hoosier drag radial

 

Anyone

 

its not throwing it off that much couple mph

 

Well, for one you should mention what gears you currently have.

Secondly, a stock sized tire is 25.7" in diameter. The size you mentioned is 28" in diameter. That is a decent jump. A 28" tall tire with 3.73s is basically the same final drive ratio as a completely stock gear/tire sized car (3.42's with 25.7" tire).

EDIT: At 60, your speedometer is reading roughly 5mph too slow. You are actually going 65.

Tools I used for calculations:

http://www.miata.net/garage/tirecalc.html

http://www.richmondgear.com/101032.html

 

Sorry I thought I put the gear I'm running lol I'm running 3.23

 

I forgot you are auto. I am not 100% sure on how to calculate what gears you should run with the taller tire since you have to allow for a certain amount of slip in the torque converter. I am a T-56 guy myself (if you could not tell by my name) so I have never had to calculate that. Depends on how much power you make, if you are spraying, etc. etc. We had a local out here that ran a 4000 stall with 3.73 gears and 26" tall slicks, with just headers he would lift a tire on the launch. I am assuming you are not making crazy power, so with the 28" tall tire you could probably get away with 4.10 gears. Really depends how much highway driving you do and such though. With that gearing setup and proper suspension I could definitely see you scraping a 1.4x 60' though.

 

Yea imma find some 26 tires see if it does better then imma get some gears caint figure what gears I want 3.90 or 4.11

 

Well I did a cam swap like a month ago I'm running a 232/234 598/598 112 cam and did long tube and exhaust I ran a best of 8.2 right now I no I need gears just time seem very slow to me and thought it was messing up my et I hit a best 1.7 60ft still haven't ran it much on the track

 

Sounds like your car is not producing the power it should. With a 1.88 60' I ran a 7.65 in the 1/8th. If I could pull a mid 1.7 I bet I would running like a 7.3/7.4 in the 1/8th. Sounds like you need a tune or something along those lines. You ever put your car on the dyno?

 

No I haven't got it in a dyno just street tune but my tuner hasn't had time to tune since I did header swap and its throwing rear 02 and egr since I no longer have them and ran it like that so u think I should be faster even with the 3.23 and 28 tire

 

Not with those gear and tire combo.

 

Yea bolo I know what u mean worst combo lol