I owned a vehicle armoring business and worked Dubai. We found we could gain more horse power,in this case translate, moving mass quicker and less costly by lowering gearing than exhaust, air intakes, cams, and other superficial add ins. Even though we also did many of the engine tweaks when clients would pay for it. I am ordering a new Bronco and buying it with the lowest gearing possible. Low gearing term equals high gear ratio,ie 4:11 gear is preferable for pulling power, 3:56 gears is great for low engine rpm's at highway speeds. That's how I always made the distinction.
guys, it's not about having a certain speed or torque number or conversion, but about understanding how it evolve with gears settings. For instance if you gain speed in mile per hour, you also gain speed in kilometers per hour, point being that changing LB.FT into nm isn't important to explain gear ratio work
Gear ratios exchange rpm for torque and vise versa depending on if it's induction or reduction. Understanding the correlation between rpm/torque is key.
I had 3.55 open gears on my Explorer with 4.6L V8 and they were ok at highway speeds but low end power suffered. I drive in the mountains a lot and frequently haul stuff, so I switched to 4.10 gears and added a limited slip differential. It helped a lot going up and down the mountains, I have more power going up, and more engine braking going down. The engine and transmission do not work as hard because the rear end is doing more of the work. Gas mileage you might ask? Well at 70 mph my tach says about 2300. Not bad at all. I just slow down on the highway and do about 60-65 mph now. I noticed barely 1 MPG lower than before. I used to get about 20-21 on the highway now I get 19-20. Barely any difference at all. With an overdrive gear, you are safe when driving on the highway with deeper rear end gears. On heavier cars or trucks with automatic transmissions, you need more gear in the back.
To anyone wondering, yes 4.00 and above with a engine that has about 350lbft of torque will do burnouts and if the motor has above 600lbft that's when you get tall wheelies.i know this because I have a gasser and I've been through it all
i have a 3.36 rear end and a 2004R trans with a fourth gear of .67. once lock-up engages and going up hill, my engine lugs and i’d have to downshift to third. my wheel/tire is 26” tall. i’d like to swap for a 3.55 but for now down shifting will do.
4.10s on my 2013 Mustang GT (manual) and topped out at 115mph in 4th gear at 7500rpm on 28" slicks. So I will gear down to 3.73s and that will increase the top speed in 4th at 7500rpm to around 130mph. Which will let me get into the 11s in 4th gear.
@@solangus7730 "pos ford" only thing that determines your speed at different gears is your transmission. Mines a six speed, so obviously gearing will be different than your 4 speed.
Hondas rev high so they use shorter gearing to reach the same speed as lower revving cars, shorter gearing means more torque at the wheels, and wheel torque is what pushes your car forward. That's why 200hp honda engine with "no torque" will accelerate similarly to 200hp turbodiesel, because although the diesel has more pushing force at the flywheel, it revs lower and needs longer gears to reach the same speed, so the wheel torque will be similar to the wheel torque of honda engine at given speed, while being vastly greater at the flywheel. That's concept of torque and horsepower for you.
so just a question that I am researching... if I lowered my final drive ratio from (idk how much it is right now) to a lower value /ratio it will allow me to cruise quiter in my car and have a higher top speed for the autobahn? but it will hurt my acceleration? did I get it correctly? if yes.. then if I do lower the final drive ratio to get a quiter car for long distances but then do few upgrades to the engine to increase HP / torque will I then be restoring the lost acceleration time (0 to 60) and still I would have a quiter car for traveling? (because my car right now is too noisy even at 50/60 mph the rpm would be at like 4/4.5k rpm...
I have a 5.3 2002 single cab. Chevy 1500 with 3.73 should i swap to 4:10. The most i drive on high is 2 hours for truck meets at 75-80 mph will it affect my vehicle? Help!!!! Advise needed!!
They could have said it produced 100 duck farts, the video wasn't explaining what torque is, just how gears worked and just how much it increase the power at the wheel
Squire T Funny though, if they'd simply made that clear in the video it would have made the overall picture simpler. It makes me think whomever edited or wrote this doesn't fully understand it at a fundamental level. Power is the torque applied & accumulated over a distance. When the torque is amplified via gearing, the wheels turn slower; when torque is reduced via gearing, the wheels turn faster. But given that fixed torque at the crank, getting from A-B over the road surface is the same overall power no matter what the gearing.
I think 3'73, is a Great gear for prrformance and Street.. I ran around. (Locally) a Few Years back, with a 55 Chevy, with 5'38 gears, then later, a 68 Camaro, with 5'38 gears! Both engines were built, and the cars, were very quick.. NOT A TRIP TAKING GEAR, for certain! I am building another 68 Camaro NOW.. IT has a CERTIFIED 400 HP 350 (Built by Mike Saye) with 4'56 gears.. STILL: Not a Gear, for LONG TRIPS!! ;)
In a video primarily about final drive gear ratios why do they keep showing the spider gears and even show what appears to be someone welding them solid? Back in the jacked-up four wheel drive craze days back in 1970s I used to get a kick out of watching guys take a truck with about 3 to 1 Street gear ratios and put tires twice the diameter of the stock tires and then destroy innumerable sets of universal joints as the huge tires made their final drive ratio more like 1.50 to 1 and when they ran it in the transfer case low range ( because they had to all the time ) it put all kinds of torque stress on the drive shaft. Same with brakes, I loved it when they would put monster tall tires on an axle with little car size brakes and wonder why they can't stop without blowing the hydraulic lines off. Haa ha ha
I recently bought a 2011 chevy colorado 2.9L and a 4speed transmission... I put a shift kit and buy a posi locker but dont know the ratio... if I wanna race 1/8"mile and drift what is the most suggested gears for that use?? I want good torque and also some speed
so when someone or a manufacturer claims a torque number, is the torque of the engine or after the gearbox and the diff? and does it mean that the actual toque numbers on the crank much lower?
mostly the flywheel power and torque is advertised.. because most of the time you have multiple rations (gears) to choose. And the difference from flywheel HP to WHP just are frictional losses i think
it's always measured at the crank with car manufacturing specs. When someone dyno's a car they always convert the horsepower at the wheels back to the original using the gear ratios. What you're then left with is your wheel horsepower. AKA engine horsepower minus friction losses
@@youridv you mean the use the trans in direct , 1:1 and calculate the torque multiplication given with the final drive out to get true 1:1 power at the tires A GM truck with the Vortec 350 advertised at 255 HP , will Dyno less , maybe 210 or so to the tires
Can never know enough,(when tuning) now, someone. Tell me what I tune each gear at for a - all wheel drive skyline gtr gear 1-5 (for a game ) wish it was mine lol)
2.95 or 3.73 final drive then work from sixth gear for the top end and the best acceleration for first. Use your 0-60 as a reference for first gear. I'm assuming your talking about Forza.
Tune them 20-30-40 mph apart using math to translate speed into engine rpm. Start your 2nd gear at 60-70 mph. Reason being, 1st gear is far too high in torque, so best to make it tall and get some grip/acceleration time in before the 1st/2nd gear shift.
My question is is there a gear a lot a variables but half turn or even a quarter turn at crank full turn at rear end that would save 3x gas I understand you’ll have 0 torque Thought process trucks use 2-3 speed rear ends could convert dually axel into single wheel axel and install two speed rear end if on the Hwy could shift into that final drive gear for maximum mpg knowing that gear is for fuel economy.. innovation also comes when feet are to flames gas $5+ per gallon. In a crooked world have to think of things like that if it doesn’t resist someone will make it
you wouldnt even notice a difference compared to a normal car... that'd be the same as when a car has a 3.73 diff and a 1:0.64 6th which is really common
really depends on how much power the engine has and what the weight of the car is. 100 hp on a 10000 pound truck is fuck all, but 100 hp on a 500 pound bike is soooo much
Depends on the transmission and the engine you have, a gas truck might need 4.10s to run 40s while a diesel can run 40s with 3.55 gears, there’s too many variables, it also depends on the actual weight of your vehicle
40 “ is pushing the envelope there. 38 “ is about all id go personally. 35 is standard size for most people who want to ruin gas mileage. The quality of the ride and increased rollovers. 👍👍.
If I go with a 3.73 gear will it make my car faster with the mods that if have on my firebird bc basically what your saying is the higher the gear ratio the lower my mph is in each gear shift...
Higher ratio: Quicker acceleration with lower top speed and more cruising RPM. Better off the line but tops out quickly and is loud on the highway. Lower ratio: Slower acceleration with higher top speed and less cruising RPM. Worse off the line but travels faster. Quieter when cruising on the highway.
@@80PercentAshamedOfU You have that A$$ backwards. A low gear is high number, a high gear is the lower number, Example A 4.56 gear is a lower gear. than a 3.73.
But in motorsports, how are gear ratios variable? Won't that mean replacing the whole gear for even the slightest change? (which is commonplace depending on tracks)
in some sports (rally) they have whole different gearboxes which they can swap for different stage types. On drag cars, they mostly use quick-change diffs.
oh i didnt heard of that, where did you read this? but unless they are using several CVTs inside a normal box, it isnt possible. Maybe they just in- or decrease the redline so they can go different speeds
@@ostfahrstreifen8421 i have known this for very long but never gotten around to understanding the engineering behind it. I'll do some search, maybe there's some new information and share
@@ostfahrstreifen8421 and no, it's not fiddling around with redlines. I agree with you that it's not possible without a CVT. Maybe some special sequential boxes?
3.70s wouldn't get me over 52 mph. But my final gear is 1:1. This comment is for classic car owners who's unsure about gearing. If you are NOT running an overdrive and want to drive regular highway speeds such as 55 or 60 on relativity flat terrain with the rpms decent and not about to sling a rod. Best gearing for 3 speed or 4 speed transmission ive found are 3.25 for a 6 cylinder and 3.00 for a v8. These gears are for regular driving not racing.
Haha so many mistakes with your graphics. The revs @ 70mph is bollocks. A 3.93 to 4.1 diff ratio would raise the rpm less than 200rpm, up from 4350 to 4538. Not the 1200rpm your graphic shows. Dumbing down for what you think your audience is? Heey nice you think so highly of us.
Qwertz Qwertz Except their visual suggests the gains from altering the diff ratio would be huge whereas the reality is 190rpm difference at what wouldn't even be top gear for most cars. Add another gear on top of the gearbox in that example and the drop in revs is even smaller.
My F250 & F350 have 3.73 gears, my old F250 had 4.10’s. Not much difference in the real world. Top speed in not an issue as these big 4x4’s ride so rough.
Except for the 18ish% difference in output rpm and 18ish% difference in torque. With very little torque outpour from your F series engines, you wouldn't feel much of a difference. 🤣
Ok, now do a video discussing parasitic loss as power is transferred from the crank through the drivetrain to the wheels. So all of you calculations in this video have to be tweaked by an average 10% loss.
@@mikionorton2236 It depends on the drivetrain. I believe modern setups (dual clutch sequential) have reduced the amount of loss a little bit. If it's a old school drivetrain, depends on if it's manual or auto (old autos can be horrible for loss).
2003-2007 G35coupes come with gearing from 3.3,3.5,3.6,3.9,4.10. And the absolutely best gearing for automatic with MM is 3.53 gearing which come in the 06-07 auto G35’coupe. basically at 65-70mph u can drop to 3rd gear and be at 5k rpm and the launch is unreal. Literally pulled on RTS upto 120mph. The manual transmissions from 06-07 come with 3.69 gearing and they are also bad as. Get 12 more whp but with the higher gearing manuals they sacrifice 10 torque compared to the automatic at 3.53 gearing if that makes sense.
It’s easy...race cars that are racing on tracks with many turns have gear ratios that allow them to pull out of corners...cars that run on tracks with long straights have ratios that allow them to pull mph down the long straightaways...🤣🤣🤣...now let’s everyone get along ...😂😂😂
Not quite right about why dyno in the 1:1 gear. It's not about output torque, it's about drag. The 1:1 gear is directly coupled, the input and output shaft are simply coupled together. This means the torque isn't being transferred through gears. This reduces drag producing a higher HP number.
Keep watching these videos and car videos and soon you will understand every word they are saying and i was at that point one year ago but then watched inital d and it got me into cars and mechanical stuff
Want to confuse someone, tell them with all things being equal, a 3.55 geared car will go faster than a 3.73 geared car. Now watch the arguments ensue. The smart ones will key into the "all things being equal" and know I'm right.
2014 ram with a 3.21 gear locked in 4x4 letting the trans shift by itself leaving at 800 rpm 14.3 2019 classic same truck with a 3.92 gear 13.99 Saying all that 2019 Redeye with a 2.62 gear and than the optional 3.09 ran .27 tenths faster so you are allowed your opinion but these are facts The only time the higher number goes against you if there are traction issues but I am talking quarter mile times all being the same trans also manuals are geared different my friend has a 14 cobra with a 3.31 gear that outruns 3.73 Cobra because of internals on 6 speed 1st will do 60 2 will do 102 3rd 142
@@kevinhatfield4078 Wow, I found another one who cannot comprehend the statement. LMAO. See what gets guys like you every single time is your head is in race TIME, and cannot comprehend the actual statement being made. None of your examples were all things being equal. Anyone else want to try? Fact still remains, ALL things being EQUAL, the 3.55 gearing is faster than 3.73 gearing. Think about the statement.
@@acdii Acceleration is quicker, max rpm comes quicker as well.....you have to match gearing with tire circumference for the track...I run 6.10 gearing on a bracket car that turns just above the cam rating of 6200 rpms.....it turns 6250 in the 1/8th mile. Makes a HUGE difference in 60 foot times, AKA acceleration.
@@imtheonevanhalen1557 Again, you would loose this if it were a bet. Read this very carefully. With ALL things being equal. ALL things, Every single thing being equal. It's a trick sure to win bet that has made me a LOT of money. Hint, it is not about time, it is about everything being EXACTLY the same, the only difference being the rear gear ratio.
Likewise. A taller rear end gear means higher speed, and usualky, better mileage. The engine better be able to put out quite a bit of horsepower for that, as well as torque to keep up with traffic off the line. I had a 3700 lb car that would get 17 mpg in the city, with a nice, big 5.7 liter under the hood. I don't know how fast it would go. I chickened out at 170 mph.
@@danieljones317 okay just so I’m getting this right say I had a heavy car like a caprice if I wanted it to get of the line easier, choosing a shorter gearing matched with it being turbo charged is like the best of both worlds? I’m just learning here don’t crucify me lolol
Disagree (respectfully) when talking about trucks in general. I swapped the 3.42 out of my old Suburban to 4.10, which is my daily driver. It does NOT use any noticeable amount more gas if doing "around town" driving. It will use more on the highway. I will never leave 3.42 in a truck again unless it's going to be driven for hours on the highway every day.
@@RedfishCarolina That’s not possible. If it’s burning more on the freeway,it’s burning more in town also. And going from 3.42 to 4.10 the ratio itself means you would burn more fuel.
@@1EVILZ06 No not really. Keep in mind this is after driving the truck for 3 years with 3.42 then another 3 years (and counting) on 4.10. Around town, you get to higher gear sooner with the 4.10. It up shifts sooner, thus spending LESS time at higher rpm. Whatever the physics is involved, gas has not cost me anything noticeably more since the swap. I still burn about 12 gallons of fuel per week (short work commute) before and after the swap. Highway mileage is worse but not such that I regret the swap. Obviously cruising at 70mph at higher rpm is going to burn more.
@@RedfishCarolina Copy that. In my brain I’m like your going to a lower ratio which means higher RPM’s. But what you’re stating makes sense. But on the freeway the RPM’s have to be higher than with 3.42’s. Just guessing about 600-850 RPMs higher? Like I mentioned I think 3.42’s are perfect. But if I were to ever switch it would be 3.73’s. 👍
@@1EVILZ06 I think I'm turning about 3000rpm in 3rd at 70mph (assuming I'm towing a heavy load, I'm using 3rd gear). Going to 3.73 won't seem like any difference at all. Trust me you won't regret going 4.10 in a truck unless you are putting 450+ hp to the ground. If I had a 4L80e trans, I'd prefer 4.56 gears because of how tall 1st gear is on the 4L80e.
You don't know what you're talking about Buddy you never once mentioned the total diameter of a tire ..tires are gears too.. you want to know what's better 373s or 410s go put 373s in your car run a quarter mile then pull the rear end out put a 410 in there then run the quarter mile you tell me.. it's 410s
@@TheUniversalid This was said at a NHRA fan event. They said 90% of race cars have to deep of gears. I guess you know more than these NHRA guys who have raced for their entire life. Call NHRA and tell them.
