I would like to cross the line in 4th gear in the 1/4 at 6200,instead of 4500 with the 3:55 's and i am running a 26.5 tire on my Ranchero .What gear would be close to this 4:11 or 4:62 ? I am a little limited on choices with my 8 inch ...
Need shift points and trans gear ratios to calculate the whole quarter mile. Also need to know what kinda elapsed time your looking for.
Sorry ,4 spd. toploader 2:78 1st ,1:93 2nd ,1:36 3rd ,and 1 to 1 in 4th.The Falcon shoots like a rocket in second but seems to stay in 3rd forever and i shift in to 4th about 30 yards from the finish line...I like to shift a little over 6000 in every gear. Currently running mid to low 14's but i would like to get in the 13's but still be able to drive around town locally.I know it wont be a cross country car with drag gears in it...
Yup. You won't be running down the highway at 2K with 4.11:1 final gears and a 1:1 4th ratio. I'll setup a calc for you, unless somebody else beats me to it.
You can play with this..... 336 X MPH X Gear ratio = RPM tire diameter You can re-arrange the #s to find out anything in the formula. Good luck, -Abone. PS. Remember, your fourth gear is one to one with your rear axle ratio.
Using flamedabone's calc, if you're doing 100mph at 1320, you need to jump to 4.89's. Seems a little high, but the right way to do it is an algorithmic type of calculation including weight, horsepower and torque curves, etc. It's almost worth the $$ to buy a desktop drag software package to do you iterations. The further along I got with setting up a calc, the more I realized that I was making way too many ***umptions about your setup.
Looks like i am going with the 4:62 's since this is as low as i can find for an 8 inch.I hope this will get me from the mid 14's to the mid 13's.If i can get a 13:99 with my little 302 , i will be as happy as a pig in ****.Who cares if i will have to drive to Temple at 50 mph at 4000 ,with people p***ing me and flipping me off all the way.I better leave a day early to get there on time...
According to your 4500 rpm and 3.55 gears and 26.5 inch tire you are crossing the line at 100 mph. ***uming 4.88 gears you would be turning 6187 rpm at that same speed. I haven't a clue what it would do for your E.T. but there is downloadable software online that will tell you.
I am crossing the line at 94 mph ,but the tire size could be a little off since i only had about 10 pounds of air in them when i ran it .
Thats ***uming my motor has the balls to pull it.The car weighs exactly 2900 with me in it ,and the motor has about 275 horses.Anyone care to take an educated guess on what this will do to my E.T.?Was running mid to low 14's with 3:55's...
Falcon? What year/weight? Seems like a lot of driveability is gonna be sacrificed for not too quick an ET. If i had to drive around town with 4.56's, my car better run bottom 12's or better. Are you very high in al***ude? Motor bone stock? That 2.78 1st gear might not like a 4.56 0r 4.62. Might act almost like a "granny" 1st gear and want to be shifted too soon to let the motor actually pull the car. I don't know. Just sounds wrong for some reason. The combo that is. OK, just read it's ONLY 2900 lbs with you in it. I think you need to put a little more power in it somehow. Sounds like gears are just a band aid. That's a LIGHT car!!! What's traction like? 60 foot times?
here's an old shareware DOS drag strip program, you can see if you can open it (having an older "traditional" computer helps) and play with it...lotsa fun.... before you click on the link, beware that it is a 600kb zip file
how about 4:11's, to keep things a bit more street-friendly, and a set of spare rims, with a shorter slick, for the track? hmmm...I guess that 26.5's are kinda short, to begin with...but? Does the motor keep pulling, beyond 6200? if so, how about shifting later, and going through the traps at the top of 3rd gear?
It sounds wrong to me, too...need to re-consider the whole, not just the gear...balance things out a bit, maybe?
It pulls up to about 6400 since i put new points in the Mallory.Although it has seen 6700 when i was speed shifting and blew the heater core up.I dont know how much the stock H.O. rods will take and i dont care to find out.I figure i am safe at 6200 since i have gone 500 higher and it stayed together...
All kidding aside. I think you will be going backwards I.E. slower. I'd go with a 3.80 and play with the tire sizes...
Traction ,you dont want to go there .It ****s if i leave much above an idle .Most of the races i get into with stock late model Mustangs and Camaros on the streets are usually rolling starts(because i plan it that way because of the traction) before we get into it and it usually ends sometime in 3rd gear for me on the parkway.
I don't know man. 2900 lbs WITH YOU IN IT, and enough cam/cylinder heads to go 6700? And it's that SLOW? What the hell am i missing here? Five bucks says your tach's way off. I'm serious. NOT trying to be a jerk here
Its only got a 600 carb on it and a small roller cam with 7.2 rockers ,Mallory dual point and coil with Accel race wires and open headers.The tach could be a ********ter i guess,but it seems accurate at lower rpm's and is consistant.It is an older sun super tach 2 .I know its not an Auto meter but i dont want one of them in a 60's g***er if i can help it
I'm not a drag racer, but it sounds like you'll spin off the line even more with higher gears. What have you got to help traction? The October issue of Car Craft has a good article on setting up leaf springs for drag racing. The article says "We've been told that for every .010 second that can be shaved off the 60-foot time, you get .020 second off of the e.t. in the quarter-mile." Thanks, Kurt
Running open headers may be giving you a little problem. The need a little back pressure. And maybe an H pipe.
it might improve, it might stay the same...hard to say...My Fairlane ran better through the exhaust, but...alot of drag cars don't have anything but open headers...is it still pulling at 6500+ for sure?...I think that carb is a bit on the conservative side...is it out of the box? Jets? squirter size? so many things to consider... If it still pulls to 6500+ I might leave it alone, be happy I had a cruising gear, and go through the traps in 3rd.
It looks out of the box 600 to me .Hey Danny you heard my motor several times at mokan at the end of the track .Did it sound like around 6200 to your ears when i shifted to 4th or not?
I hear what your saying , but i am thick headed and i trying to get her in the 13's ,the easiest way i can.To me going out and spending a few grand to gain 4 tenths makes no sense.If i can do it by sacrificing some drivabilty i will.Most of my driving with it is in town and on feeder roads.I have another car to take on long trips if i have to , but it isnt very cool .
Nope. Thats why I told you not to shift to 4th but you said it was banging. We did't hear any banging. You might try some cheap header mufflers just to see, find a friend with some more carb. at least a 650. I really thing a gear change is the wrong direction with that light of a car. I dont know what my sedan weighed but I had 3.80 in the rear. With TALL rear tires. I had sprint car baffels in my headers for back pressure.
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