What is the best Gear for drag racing
- Thread starter ALLAN_M
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300bhp/ton
New Member
agreed.try2catchmy99 said:
It will depend heavily on your setup though, and will the ONLY be used for drag racing or will it be used on the street too? And is this auto or manual?
KB recommend 3.73 with the manual box because with 4.10's you run the risk of spinning the blower to fast which may cause damage to it.
hotrodnut
Member
That is a good question and depends on a lot of factors, like what mods have you done, cam change, heads, what does the engine rev, when does it stop pulling, what transmission ratios do you have, what height rear tires are you running, etc. Most will say if you are close to stock, maybe exhaust, intake, tuner then 4.30's or 4.10's depending on your tire height and rpm limit. If you could get an idea of how many rpm's you need to be turning at the finish line then gear towards that. Ideally you want to be using all your useable power from the engine as close to the finish line as possible.
there are so many factors too consider.
Gunfighter
Founding Member
I couldn't agree more. You also have to consider that everything changes again if your are talking about an 1/8 mile track vs. the venerable 1/4 mile track, too.
hognutz
New Member
well what you would do for a race car is try to have it set where you are coming through the traps in you 1:1 gear at your peak rpm. not nessesarly realine but peak power producing rpm.
The factor is trap speed basically. if you run out of gear you will have to shift into overdrive. If you are not all the way to the end of you powerband you are proably leaving ET on the table.
For a stockGTit is probaly 4.30's as I think you would hit the rev limiter in 1:1 with 4.56's. Now a cobra could proably run 4.56's just fine because of its higher redline.
once you start moding you kind of have to play with it. you can also play with your rear tire size as well. if you put in 4.30's and started running out gear you could run a larger tire in the rear if you did not want to change your gears.
it is all about rpm's to make a short story long.
my advice would be to mod the car. go run it. take a look at your trap speed. then start doing some math. there are tones of calcutators on the web where you can enter you tire size, gear ratio, and it will spit out MPHvsRPM.
The factor is trap speed basically. if you run out of gear you will have to shift into overdrive. If you are not all the way to the end of you powerband you are proably leaving ET on the table.
For a stockGTit is probaly 4.30's as I think you would hit the rev limiter in 1:1 with 4.56's. Now a cobra could proably run 4.56's just fine because of its higher redline.
once you start moding you kind of have to play with it. you can also play with your rear tire size as well. if you put in 4.30's and started running out gear you could run a larger tire in the rear if you did not want to change your gears.
it is all about rpm's to make a short story long.
my advice would be to mod the car. go run it. take a look at your trap speed. then start doing some math. there are tones of calcutators on the web where you can enter you tire size, gear ratio, and it will spit out MPHvsRPM.
Kronos
New Member
you need to run dyno numbers to know where you make peak power and ge gears that compliment that the best
crazynorwegian
Dirt-Old 20+Year Member
higher gear ratio's wont help you much if you dont have good tires to get the torque to the ground. I've seen a lot of people who have gotten worse track time off 4.10's because they are running crappy tires. to get the real gains out of gears you need dr's or slicks.
hognutz
New Member
crazynorwegian said:
traction is a separate issue to gearing. If you like drag racing you will have good tires and suspention before long.
hognutz
New Member
it would be between 4.10's and 4.30's no doubt. that package gets you knowwhere near the power to run 3.73.
now pick you rear tire size and cam and intake and you should know what you new usable power band will be to decide between the 4:10 and 4:30
if you keep you stock limiter settign of 6050 I would go 4:10's. If you up it to 6500 I would go 4.30's. just my opinion though. 4.30's with stock tire diameter and 6000rpm redline giver you 107mph. I think you would want a little more margine. now you up the limiter 6500 and you would have to trap 115 to hit it.
now pick you rear tire size and cam and intake and you should know what you new usable power band will be to decide between the 4:10 and 4:30
if you keep you stock limiter settign of 6050 I would go 4:10's. If you up it to 6500 I would go 4.30's. just my opinion though. 4.30's with stock tire diameter and 6000rpm redline giver you 107mph. I think you would want a little more margine. now you up the limiter 6500 and you would have to trap 115 to hit it.
hognutz
New Member
I guess I was cosidering that implied but your rights. wile you doing gears if you plan on launching I woud upgrade axels and LS as well.
topless98gt
Adhesive Feces
higher gear ratios help, if you know how to drive. Traction on street tires is all about finessecrazynorwegian said:
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