What Is a Good Gear Ratio for 1-8 Mile With 32 Inch Tires
i/8 mile gear selections
Everything from the motor to the wheels
Moderator: John_Heard
- dirttracker
- Posts: 26
- Joined: Mon Jul 05, 2010 seven:25 pm
one/viii mile gear selections
New to dragracing been a dirtracer 40 years would like advice on gear for my s15 gmc.Has a 406 small 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 point cage,10 gal cell mounted back of bed along side the battery,I can't requite hp#south not a dynoed motor but a mild 406,I shift it at 6400,I tried a 456 went 7.32 @98mph with ane.70 sixty ft time in 1/viii mile ,went through lites at 5400,would similar some input on what others think about gearing,all motor NO NOS,Thanks appreciate whatsoever comments. 
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BracketNova
- Posts: 618
- Joined: Sat April 25, 2009 6:46 pm
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Re: i/8 mile gear selections
I have 4.88s with alot of similaraties to your setup. I believe I'm at 5800/5900 in the eigth.
"I always compare elevate racing to lighting $100 bills on fire, merely information technology's more expensive." - Craig Due west.
Check out my website...
http://www.findmoneyraces.com
'71 Nova E85
6.69 @ 100.ii MPH ix/half-dozen/xiv
one.4257 60'
1700' DA
13:i 439 BBC
3330 lbs
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Bruce69Camaro
- Posts: 1798
- Joined: Thu Jul 23, 2009 11:07 am
- Location: PA
Re: 1/8 mile gear selections
Here's a formula for you to utilise.
Perchance this will assist you out?
Tire Diameter 10 RPM / (336 x mph) = Gear Ratio
IE: 29 ten 6400 / (336 ten 113) = iv.89
Bruce
Those who remember they know it all have no fashion of finding out they don't......... 
- mytmouz
- Posts: 647
- Joined: Thu Sep 21, 2006 1:00 am
- Location: Pelahatchie,MS
Re: 1/8 mile gear selections
I ran 5:13's with a similar combo on that size tire on motor...
Trucks are for haulin...
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wikd69
- Posts: 2077
- Joined: Sat Feb 23, 2008 12:42 pm
- Location: Rocklin, CA
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Re: one/8 mile gear selections
dirttracker wrote:New to dragracing been a dirtracer 40 years would like communication on gear for my s15 gmc.Has a 406 modest block 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 point cage,10 gal cell mounted back of bed forth side the battery,I tin't give hp#southward not a dynoed motor just a balmy 406,I shift it at 6400,I tried a 456 went 7.32 @98mph with one.70 60 ft fourth dimension in one/8 mile ,went through lites at 5400,would like some input on what others think about gearing,all motor NO NOS,Thank you appreciate any comments.
This is what I used to calculate RPM & gear ratios.
http://www.markwilliams.com/calculators.aspx
- dirttracker
- Posts: 26
- Joined: Monday Jul 05, 2010 7:25 pm
Re: 1/8 mile gear selections
Capeesh the come up back I believe y'all answered my question.I will build a set 4.88 and requite it attempt and keep you posted. THANKS.
- dirttracker
- Posts: 26
- Joined: Mon Jul 05, 2010 7:25 pm
Re: 1/8 mile gear selections
I put a 5.29 gear in it and ran 7.02 at 98mph with a 1.58 60 still merely turned 6000 out the lights. I'm going to put some new slicks on this week and I'm hoping to become in the 6's.Thanks again for the input. 
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Speedster
- Posts: 183
- Joined: Monday Feb 08, 2010 2:35 pm
- Location: Aloha, Oregon
Re: ane/8 mile gear selections
nosotros have a existent simular ready except 31.0x12x15w tires launch on the trans brake 4000rpm. 4.88 spool pg trans.
60ft one.718
330 four.959
ane/eighth vii.717
mph 89.32
one thousand 10.091
1/4 12.092
mph 112.59
i promise that helps
- dirttracker
- Posts: 26
- Joined: Mon Jul 05, 2010 seven:25 pm
Re: 1/8 mile gear selections
I went to denton tx. last nighttime and ran a 6.9621,/1.5374 60 ft./four.4591 330 ft./ 97.61 mph./with a .1740 reaction time please don't laugh thats my all-time reaction time so far.Thats our fastest run yet. Olaho oregon is a cute place nosotros 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,as well every bit down in california.I was a decent clay racer but I'thousand finding elevate racing very challenging and that tree is a real hummer.Thanks for the info,I need all the communication I can get.You take a actually prissy ride and fast likewise.
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Speedster - Posts: 183
- Joined: Monday February 08, 2010 2:35 pm
- Location: Aloha, Oregon
Re: i/eight mile gear selections
I'm a recent switch back to drag racing too! We started racing stock cars at portland speedway in the late 80's early ninety'due south and some modifieds at south audio and in 98 we switched to dirt track racing and won 8 track championship v in a dirt street stock and 3 in a open bicycle midget and ran most of those tracks yous 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 circular and bought a drag car and homo everything has inverse a agglomeration over the years only we are getting the swing of information technology again and take made all the mode to the semi's once this year and my son is starting to chop the tree pretty good. he is living around .020 ave light and has a best of .002 this year. and number #1 qualifier one time this year likewise. nosotros started the year running thirteen.00 and our all-time this year is now 12.09 @ 112.59mph.
- dirttracker
- Posts: 26
- Joined: Mon Jul 05, 2010 7:25 pm
Re: 1/viii mile gear selections
Thats kinda wild our backgrounds being about the same.I enjoy this aspect of racing at my age [58] considering it is less work, I can't say I don't miss going in circles but I besides don't miss the piece of work involved in going in circles.I have only went to testntunes so far but tomorrow I'm going to become try out what I've learned so far, they are having some index races and I'k gonna run the vii.00 index class. I remember my beginning dirt 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 like your son is a heck of a driver and thats awesome.We don't have but a couple of quarter mile tracks left around here and they run i/8 mile near 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/iv.I wish y'all guys lots of success sounds like your going in the right management.I'll let you know how I fare tomorrow dark.Thanks for the come back.
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Speedster - Posts: 183
- Joined: Monday Feb 08, 2010 2:35 pm
- Location: Aloha, Oregon
Re: i/viii mile gear selections
yeah nosotros just run the same gear. im 45 on dominicus and thats alot of the reason i quit circle track racing as well.
i like to sit within and play on the computer more than then thrash on a machine every night for hours. now i put in a couple hours a week and race when we feel similar information technology and are having a expert time. no stress. lol
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BracketNova - Posts: 618
- Joined: Sat Apr 25, 2009 6:46 pm
- Contact:
Re: one/8 mile gear selections
dirttracker wrote:......with a .1740 reaction time delight don't laugh thats my best reaction fourth dimension so far.
I'm non trying to exist an A$$, I believe you said you were new to drag racing. Anywhoo - are yous whacking the throttle when you encounter the green light? If your not using a filibuster box it yous need to leave on or before long afterwards the concluding yellowish. With your car probably presently after.
My all-time reaction pes braking was .0001 in a reaction time contest...won 300 bucks for 1 laissez passer =)
"I always compare drag racing to lighting $100 bills on fire, only it's more expensive." - Craig West.
Check out my website...
http://world wide web.findmoneyraces.com
'71 Nova E85
6.69 @ 100.ii MPH 9/6/xiv
one.4257 60'
1700' DA
13:one 439 BBC
3330 lbs
- dirttracker
- Posts: 26
- Joined: Mon Jul 05, 2010 vii:25 pm
Re: 1/viii mile gear selections
I know what your saying speedster I had 2 or 3 jobs most of my life and ane of them has been circletrack racing,simply you lot know I'm enjoying this new claiming........spaz109 thanks for the advice I appreciate the come back and I'll try it.
- dirttracker
- Posts: 26
- Joined: Mon Jul 05, 2010 seven:25 pm
Re: ane/8 mile gear selections
Well I went and tried to win my first dragrace and went 7.03 the first pass,seven.x the second pass,then the laissez passer that counted I went half-dozen.97 and broke out running in the vii.00 alphabetize class and to top information technology off I did a heck of a job I redlighted by .0085 on on pro tree.lol.Well I've requested help to make my ride faster and you guys came through my truck is pretty quick and consistent heres my side by side asking how y'all gonna assist a old dirttracker get more consistent on the lights,I know practice would help but come on guys I'm one-time and looking for magic!Appreciated the come up backs and assist,I'k having a smash and looking forward to getter better.Skilful luck to you all. 
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