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What's the Best Gear Ratio for Drag Racing

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ddandurand
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Joined: Oct/21/2007
Location: Michigan
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Post Options Thank you(0) QuoteReply Topic: Best drag racing gear ratio
    Posted: Mar/eleven/2008 at three:05am

What would exist the all-time gear ratio for a motorcar but just for the strip. I was thinking 4.10s, just that seams balmy, what would you suggest?

Devin

'66 American

Brek
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Joined: Jul/07/2007
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Post Options Thank you(0) QuoteReply Posted: Mar/11/2008 at 3:45am

Gear ratios all depend on where in the rpm'due south you brand the bulk of ability & what height tire you volition be using.

When I purchased my motorcar it was prepare with 4.56 gears & 27" tires and I crossed the traps at 6100-6500rpm. I have since switched to iv.10 gears & 26" tires and I now cross the traps at 6000-6100 which worked out perfect for where my motor made power.

Edited past Brek - Mar/11/2008 at 5:47am

69' amx all-time et so far 12.06 @ 115 mph

FuzzFace2
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Mail Options Thanks(0) QuoteReply Posted: Mar/11/2008 at v:15am

Brek is correct When I did my elevate car I went with four.56 with nine x 28� One thousand/T slicks car started with a 304 w/big cam & automobile due west/4000 stall.

I also looked at it that down the road I will go bigger motor and run in the higher RPM range and did not desire to do some other gear change.

Right at present same rear and trany (TH400) and stall backside a 360 280H cam information technology runs thirteen.0�s and 6000 rpm at the line. Could use less gear or more motor just for mismatch parts it goes pretty good.

I was looking at 4.10 when I first started my rear end build. What is the residue of your build like motor, trany, rear tires?

Dave ----

PHAT69AMX
AMC Fond

Joined: Jul/07/2007
Location: West Virginia
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Mail service Options Thank you(0) QuoteRespond Posted: Mar/12/2008 at 8:09am

Beginning make up one's mind what ET and Speed you want to run in the 1/4 mile.

From that yous and then demand to know what the weight of yur vehichle will exist.

So from Weight and Speed or ET y'all can become required HP to do it.

Speed and ET are linked for "ideal" possible past Physics.

Then for the targeted weight and HP in that location is a Time and Speed.

From the "ideal" Speed work backwards through tire size and rear end gears

to get meridian engine rpm when crossing the end line at that "ideal" speed.

Choose the Gears that work for that Weight, HP, ET, Speed, Tire Size, Engine RPM.

Edited by PHAT69AMX - Mar/12/2008 at 8:09am

ddandurand
AMC Amateur

Joined: Oct/21/2007
Location: Michigan
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Post Options Thanks(0) QuoteReply Posted: Mar/13/2008 at 2:34am

I institute a few calculators that do all the math for yous, information technology worked out peachy

I wanted an eleven.00s motorcar

I put in that the iv-door rambler weight was 3200 lbs give or take a few

It told me that my car would run effectually 123 mph

and that it would take around 476 hp to achive that.

Does that sound right?

'66 American

PHAT69AMX
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Post Options Thanks(0) QuoteReply Posted: Mar/13/2008 at 4:44am

Aye that's pretty shut to what the Moroso Power Speed computer says.

11.00 goes with 120-121 mph and ~seven.five lbs/HP at the tires

3200 lbs / seven.five lbs/hp = 427 HP @ Tire & twenty% drivetrain loss = 534 HP @ Motor.

And then 121 mph = 10, 648 ft/min

28" slick = 7.33 ft circumference ( pure, no squish from auto weight )

x,648 ft/min / 7.33 ft/tire rev = 1453 RPM for 28" dia. Tire @ 121 mph

6500 rpm motor at stop line / 1453 rpm tire @ 121 mph = 4.47:ane Ring and Pinion.

as an instance

SS/AMX-MM
AMC Nut

Joined: Aug/15/2007
Location: Nebraska
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Post Options Thanks(0) QuoteReply Posted: Mar/xv/2008 at v:39am

PHAT69AMX

What does the Moroso Power Speed reckoner say for 7000 to 7200 RPM in traps.

I accept 5:xiv's at present with a 264 low T-10

 29" slick

3400 pound car

Sr.

PHAT69AMX
AMC Addicted

Joined: Jul/07/2007
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Mail Options Cheers(0) QuoteReply Posted: Mar/15/2008 at 4:05pm

seven,100 rpm / v.14 gear = 1,381 rpm @ tire

29" slick = 7.59 ft circumference ( pure, no squish from motorcar weight )

1,381 rpm @ tire x 7.59 ft circ. = 10,482 ft per minute

x,482 fpm = 119 mph for 29" slicks, 5.14 gears, and 7100 rpm @ motor

So information technology comes out nigh the same as the above example

around 11.00 sec @ 120 mph and the ~7.five lbs/HP at the tires

for 3400 lbs divide past 7.5 lbs/HP = 453 HP @ tires

then using xx% for drivetrain loss = 567 HP @ Motor

not that the caculator is gospel, but it'south fun to wait simply to look.

Edited past PHAT69AMX - Mar/15/2008 at 4:07pm

SS/AMX-MM
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Mail service Options Cheers(0) QuoteReply Posted: Mar/xvi/2008 at 7:46am

PHAT69AMX Cheers! I need to keep this car at 10.90 or xi.00. No Muzzle Sr

yanus32
AMC Fan

Joined: Apr/12/2012
Location: Slovakia
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Mail Options Thanks(0) QuoteAnswer Posted: Apr/twenty/2012 at 7:45am

Nice calculator is here:

http://www.cargister.com/calculator-gear-ratio

Edited by yanus32 - April/twenty/2012 at seven:45am

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