how to know what gear ratio you have will do in the 1/8 mile

#1 Postal service by **dirttracker** » Tue Jul 06, 2010 eight:34 pm

New to dragracing been a dirtracer 40 years would like advice on gear for my s15 gmc.Has a 406 modest cake edelbrock performer aluminum heads stock out of box,12.5kbpistons,550liftsolidlifter camshaft,victor jr intake,willys 750gas carb,msd cranktrigger ignition with 7 al box,powergide with 8inch bte 4500 stall converter with trans brake,narrowed strange rearend with 33 spline axles,29/eleven.5w 07 compound hoosier slicks with 97 inch rollout,truck weighs 3050 lbs,has 12 bespeak cage,10 gal jail cell mounted back of bed along side the battery,I can't give hp#s not a dynoed motor merely a balmy 406,I shift it at 6400,I tried a 456 went seven.32 @98mph with i.seventy lx ft time in 1/8 mile ,went through lites at 5400,would like some input on what others think about gearing,all motor NO NOS,Thanks capeesh any comments.

#2 Mail by **BracketNova** » Tue Jul 06, 2010 9:31 pm

I have iv.88s with alot of similaraties to your setup. I believe I'g at 5800/5900 in the eigth.

#3 Post by **Bruce69Camaro** » Wed Jul 07, 2010 5:31 am

Here'due south a formula for yous to use.

Maybe this will help you lot out?

Tire Bore 10 RPM / (336 x mph) = Gear Ratio

IE: 29 x 6400 / (336 10 113) = iv.89

Bruce

#4 Postal service past **mytmouz** » Wed Jul 07, 2010 10:17 am

I ran 5:13's with a similar combo on that size tire on motor...

#5 Post past **wikd69** » Wednesday Jul 07, 2010 11:00 am

dirttracker wrote:New to dragracing been a dirtracer 40 years would like advice on gear for my s15 gmc.Has a 406 pocket-sized cake edelbrock performer aluminum heads stock out of box,12.5kbpistons,550liftsolidlifter camshaft,victor jr intake,willys 750gas carb,msd cranktrigger ignition with 7 al box,powergide with 8inch bte 4500 stall converter with trans brake,narrowed strange rearend with 33 spline axles,29/11.5w 07 compound hoosier slicks with 97 inch rollout,truck weighs 3050 lbs,has 12 betoken muzzle,10 gal jail cell mounted dorsum of bed along side the battery,I can't requite hp#s non a dynoed motor just a balmy 406,I shift it at 6400,I tried a 456 went 7.32 @98mph with ane.70 threescore ft time in one/eight mile ,went through lites at 5400,would like some input on what others think about gearing,all motor NO NOS,Thanks appreciate whatever comments.

This is what I used to calculate RPM & gear ratios.

http://www.markwilliams.com/calculators.aspx

#6 Mail service by **dirttracker** » Wed Jul 07, 2010 iii:47 pm

Appreciate the come back I believe you answered my question.I will build a fix 4.88 and give information technology try and keep you posted. Cheers.

#vii Post by **dirttracker** » Saturday Jul 10, 2010 8:43 pm

I put a 5.29 gear in it and ran 7.02 at 98mph with a ane.58 60 still simply turned 6000 out the lights. I'yard going to put some new slicks on this calendar week and I'thousand hoping to get in the 6'southward.Thank you once more for the input.

#8 Postal service past **Speedster** » Wed Jul xiv, 2010 11:52 pm

we have a real simular gear up except 31.0x12x15w tires launch on the trans restriction 4000rpm. 4.88 spool pg trans.
60ft i.718
330 4.959
1/eighth vii.717
mph 89.32
grand x.091
1/4 12.092
mph 112.59

i hope that helps

I went to denton tx. last night and ran a 6.9621,/1.5374 60 ft./4.4591 330 ft./ 97.61 mph./with a .1740 reaction fourth dimension please don't laugh thats my best reaction time so far.Thats our fastest run yet. Olaho oregon is a beautiful place we lived in Eugene for 14 years.I raced dirt modifieds at willamette speedway in lebanon and at cottage grove,coosbay ,medford,up in washington at skagit speedway,every bit well as downwardly in california.I was a decent dirt racer just I'm finding drag racing very challenging and that tree is a real hummer.Thank you for the info,I need all the advice I can go.You have a actually prissy ride and fast too.

#10 Post past **Speedster** » Thu Jul xv, 2010 7:02 pm

I'k a recent switch back to drag racing also! We started racing stock cars at portland speedway in the late 80's early on 90'south and some modifieds at south audio and in 98 we switched to dirt rails racing and won eight runway championship 5 in a dirt street stock and 3 in a open wheel midget and ran virtually of those tracks you said. My son started in a camaro when he was 12 and we did that for 3 years and i got tired of all the work and money and sold everything to do with roundy round and bought a drag car and man everything has changed a agglomeration over the years merely nosotros are getting the swing of it once again and take made all the way to the semi'southward one time this twelvemonth and my son is starting to chop the tree pretty adept. he is living around .020 ave light and has a all-time of .002 this year. and number #1 qualifier once this year likewise. we started the year running thirteen.00 and our best this year is now 12.09 @ 112.59mph.

#eleven Post by **dirttracker** » Fri Jul 16, 2010 5:07 pm

Thats kinda wild our backgrounds existence almost the same.I enjoy this aspect of racing at my historic period [58] because it is less piece of work, I tin can't say I don't miss going in circles but I too don't miss the work involved in going in circles.I have just went to testntunes then far but tomorrow I'm going to get attempt out what I've learned so far, they are having some index races and I'm gonna run the seven.00 index class. I remember my kickoff clay race I did'nt win it either in fact it took well-nigh of the year before I won my first heat race .It sounds similar your son is a heck of a driver and thats awesome.We don't take but a couple of quarter mile tracks left around hither and they run 1/8 mile most of the time only run the 1/4 mile a couple times I guessa twelvemonth.Do you run the same gear in the 1/eight mile as the 1/4.I wish you guys lots of success sounds like your going in the right management.I'll permit you lot know how I fare tomorrow night.Thanks for the come dorsum.

#12 Post by **Speedster** » Fri Jul 16, 2010 10:37 pm

yes we but run the aforementioned gear. im 45 on sun and thats alot of the reason i quit circumvolve track racing too.
i similar to sit inside and play on the computer more and so thrash on a car every night for hours. now i put in a couple hours a week and race when we experience like it and are having a expert time. no stress. lol

#13 Postal service by **BracketNova** » Sat Jul 17, 2010 12:06 am

dirttracker wrote:......with a .1740 reaction time please don't express mirth thats my all-time reaction time so far.

I'thousand not trying to be an A$$, I believe you said you were new to drag racing. Anywhoo - are you whacking the throttle when yous see the light-green lite? If your not using a delay box it y'all need to leave on or before long after the last xanthous. With your motorcar probably shortly after.

My best reaction pes braking was .0001 in a reaction time contest...won 300 bucks for one pass =)

#14 Mail by **dirttracker** » Sat Jul 17, 2010 vii:45 am

I know what your saying speedster I had 2 or 3 jobs near of my life and 1 of them has been circletrack racing,but you know I'm enjoying this new challenge........spaz109 thanks for the advice I appreciate the come up back and I'll effort it.

Well I went and tried to win my get-go dragrace and went 7.03 the first pass,7.10 the 2nd pass,so the pass that counted I went six.97 and broke out running in the 7.00 index class and to peak it off I did a heck of a chore I redlighted past .0085 on on pro tree.lol.Well I've requested assistance to brand my ride faster and you guys came through my truck is pretty quick and consequent heres my next request how you gonna assist a old dirttracker go more consistent on the lights,I know practice would assist but come on guys I'thou sometime and looking for magic!Appreciated the come backs and aid,I'm having a smash and looking frontwards to getter ameliorate.Skillful luck to you all.

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