tire size vs gear ratio drag racing

It isn't realistic to think a 331 with 410 HP will propel a car like that to 150, or even 120 MPH on a drag strip, so let's say 110 MPH is a reasonable top speed for that car for either at the track or for running down the open back roads. ! If you are only wanting to drive around town and do effortless burnouts, be "quick", and look great at the Wednesday night drags, then you'll want a set of gears that best suits that style of driving, which will be low gears. The engine is literally only HALF of the battle. When you change your tire size you need to make sure you have the right gearing to get optimal fuel economy and power. Optional rock rings and center caps can allow you to customize your wheels.The classic D-Window wheel is one of the most recognized wheels in the industry. If you can't launch and GET to your speed quickly, you won't run a good elapse time. The aftermarket has responded to this by offering a plethora of ratios ranging from 2.91 to 6.50:1. Made of stamped heavy gauged steel with a black powder coated finish.Here's a formula you can use to calculate your vehicle's tire diameter: Rear end gears on cars are no different, and having the wrong gear ratio is exactly like trying to do a wheelie in 5th gear, or trying to go down the road at 30 MPH in 1st. Now divide the 179200 into the 1380.96 and we get 129.79. You have to remember, they are RATIOS, so the numbers can fool you. Sure, LOTS of engines can rev way past where they nose-over, but it's completely counter productive to run it past that point. Potential Maximum Safe Engine RPM : Tire Size Diameter: Desired Target MPH: Calculate. In almost all cases it's better to go less in RPM than too much. The value will be returned in estimated differential gear ratio, based on the entered values. Wallace Racing BACK to Auto Math. Gear ratio and tire diameter charts are ideal for making your car as efficient as possible. When guys want to make their cars "perform" better, (and don't know any better), the only thing they look at and consider is the engine. 70 MPH x the axle ratio you want to see about x 336. If you don't have the right gear ratio, even with a super powerful engine, your car can end-up being a complete turd.When selecting a set of rear end gears, it's always nice to know, (or at least closely estimate), what RPM you'll be at for any given speed you'll be traveling. That means our top speed at 6,400 RPM with a 28" tall rear tire will be right at 130 MPH.So looking at that 129.79 (130) MPH number we calculated, that's within the quarter mile time of a typical low to mid 10 second car. Too many guys like to brag about how high their engine can rev, which just shows how much they DON'T know about cars, engines, and performance. There are some 3.80 gears out there but for most gear manufacturers only offer 3.73's and 4.10's. A really tall set of gears would be something like 3.00's.Let me give you some examples: Firstly, always remember this, rear end gears are no different than the 5 sprockets you have on any given 10 speed bicycle. Now add the torque converter slippage of a couple of hundred RPM and you're up into the 6,300 RPM area which is just too high for an engine that noses-over in power at 5,700 RPM. The Spartacus Bumper features a satin black powder-coated finish on a sturdy 11 gauge stamped steel construction. Rear Axle Ratio x MPH x Transmission output ratio x 336 / tire diameter. 70 MPH x 3.00 gears x 336 = 70560 Divide that by the 28" tall tire diameter that I chose which = 2,520. You always go by where it peaks out on power... nothing higher in RPM than that!So using the 6,400 RPM example I gave in the past paragraph, you won't want to go through the finish line higher than that or the car is "nosing-over" and isn't pulling as hard as it was when it was under that peak RPM.The next thing you need to do is measure the diameter of the rear tires you're running.

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