1/4 mile time estimate

[98extgreen]

its a 98 chevy ecsb 5.7

mods are

long tube headers
2.5" exh no cats
k&n cai
u/d pulley
efans
tb spacer
3.90 gear ratio no posi


when i just had k&n pulley and efans i ran 15.4 1/4 mile on orginal wheels...and on 22's 15.9

i sold my original wheels and now i have 22's with airbag suspension with all the mods shown above and i ran 15.5

what should it be at if i ran it again on original wheels...im hoping 14.9 to 15.0 then ill put the zz4cam in it and get it tuned maybe nitrous

[custm2500]

What was your original gear ratio?

I don't think that your currant mods will drop a half a second of you best time. They may be good for 2-3 tenths but I am rather confident you will be at best 15.1. Especially if you have an open diff. Now if you went from some crazy gear of 2.73 to your current 3.90 then you should break into the 14s but I am guessing you had a 3.73 stock?

[98extgreen]

What was your original gear ratio?

I don't think that your currant mods will drop a half a second of you best time. They may be good for 2-3 tenths but I am rather confident you will be at best 15.1. Especially if you have an open diff. Now if you went from some crazy gear of 2.73 to your current 3.90 then you should break into the 14s but I am guessing you had a 3.73 stock?

yea they were 3.73 stock

[Outlawz2004]

14.9-15.1

[98extgreen]

im gonna get it tuned tommorw....would it affect it if i have it tuned with my 22s then switch to the orignals performance wise....??

[Pewter-Q]

It more depends on the tire size, if it changes too much, your shift points will be thrown off a bit.

[SilveradoSexy]

There is no good way to guess this, you have to go run.

[custm2500]

yea they were 3.73 stock

Why did you waist the time swapping them out? Did the old gear set get ruined? Just seems like such a waist to change gears with no noticable differance in ratio.

[98extgreen]

Why did you waist the time swapping them out? Did the old gear set get ruined? Just seems like such a waist to change gears with no noticable differance in ratio.

becuase us the original ones where whininng really loud whihc eventually led to them ****ing up

[98extgreen]

ok i got my truck tuned....it feels really good..the only thins is he tuned it for thre 22;s and i had the stockers on so i did notice the speedometer was way off....im gonna get it retuned before track night which is wednesday

[98extgreen]

i ran a best of 14.9 in 1/4 mile

had heave traction issues .....my speedometer was still off even after the retune.....which i feel caused the rpms to be off but could just be me

[Outlawz2004]

Quess I was right on the time.Wheel change wont affect its performance that much, I had mine tuned for 20s and run 16s with a 26" tire on the rear at the track with no problems.

[Air_jordan99]

Without changing the tire diameter changing rims can affect your times... Going from a wheel that weighs 15lb to a wheel that weighs 30lb increases your rotating mass. The more weight the motor has to spin the slower your times will be.

[Outlawz2004]

Without changing the tire diameter changing rims can affect your times... Going from a wheel that weighs 15lb to a wheel that weighs 30lb increases your rotating mass. The more weight the motor has to spin the slower your times will be.

Yes it will. :patriot: But I was explaining how running a truck tuned for a 30" tall tire and going to a 26" tall tire wont affect the shifts points bad enough to outweigh the good that comes from loosing all the wheel weight and getting a better gear ratio. Of course this is all up to a certain point, you cant go from 30" tires and 4.56 gears to 26" tires without possibly loosing alot of top end.