Can a video be made to give good reasoning and explanations that will convince a persons significant other that a new expensive gearbox is both needed, practical and a smart purchase for the family.
That's easy -- if the top gear reduces rpm, that would reduce engine wear, noise and gas consumption. Maybe the other person is smart and says, let's just put in a lower final ratio. The problem there is that many modern cars don't have optional final ratios.
Dual clutch's generally provide more speed and better economy. I would presume the same could be said for a straight cut or dog box since they're more efficient than a normal manual. So not only will it save you money in fuel but it wil also mean you can get places faster which allows more time to spend with the family/better half. Hows that?
This video was exactly what I was googling for. The basic of what I wanted to know about all the different manual gearboxes. Presented in a clear and concise manner as well. Well done. Thank you.
I remember meeting Andrew when he did a feature on one of mi mates cars for ignition, been around along time mate glad to see you as one of the main faces in this industry, keep on going strong mate well done
Ive been searching for a good explanation of why people call synchro teeth or splines, dog teeth, when they are not the same. This was a great breakdown!
A "taller" 1st gear might also be used to downshift in very tight corners instead of trying to crawl out in 2nd to avoid blowing your engine in smithereens with a normal 1st gear.
Awesome video. Super informative for the enthusiast thats not an performance technician. Pros and cons layout was superb and just what i was looking for. Thanks.
Should have mentioned that a motorcycle cycle gearbox is sequential and dog clutch as a good example of this type of 'box. Like {Kroberter} said below, well spoken.
Robert D Way back in the day, I swapped a 5 speed close ratio in place of a 4 speed in a diesel rabbit. Those things are soooo slow, rated 52hp. Dropped like 5 seconds off the 0-60, felt like a comparison of it picking up 15-20hp. Way over on the other hand, I put a close ratio behind a late model diesel and while it would rip trees out, a buddies stock model was quicker.
Have to point out a straight cut gear is actually weaker than a helical gear. Its just they dont generate axial load which forces to 2 gears aparts and causes teeth to get munched off.
Peter Donaldson mate you might want to check your facts if size is equal helical gears are stronger because they are longer contact patch because theyre angled. Most straight cut gears replacing helical take up less room therefore can be made larger in same space. Its not to say they're stronger only that bigger teeth are stronger than smaller teeth. Once again my point is that its the axial load that causes helical gears to fail not that they are weaker
Swings and roundabouts... For the same tooth count, a helical gear is thinner in the loaded direction - approximately 90 degrees to the tooth face helix. A helical gear is point loaded, with a sliding action, whereas a spur/straight cut gear is loaded across the full width of the gear - so it has a higher stress on a smaller load bearing part of the tooth - you can verify that with a simple vector diagram. A helical gear has a higher axial force on the end thrust faces/bearings, which increases with the helix angle, and 'may' increase case loading and distortion. Despite the common misconception (even seen here) there is still a single tooth contact for most of the rotation of the gears, except the very small period when the load is transferred from one pair/set to the next. Where a helical gearbox has a big advantage is in reducing the backlash/chatter/shunting as torque is transferred more smoothly between the loaded teeth as the shafts rotate, which means they are much, much quieter - spur gears can be made relatively quiet ( I have known an instance where it sounded just like any normal helical type - but that was a single example), but the tooth design and manufacturing is expensive as the tolerances and design has to be right.
Thank you! This article synchronized my ideas about gearboxes. Q: is there a way to identify if a gear teeth is broken? Bcs a loose piece of metal can destroy the entire gearbox.
How do you engage reverse on a sequential gearbox? My only experience with sequential transmissions is with motorcycles or what BMW calls their sequential transmission, which is basically a manual transmission with an electro-hydraulic clutch.
Great video. I was excited when I saw the screen showing gears for the 6 speed until I saw that it was for a GT-R. I was looking for a sequential shifted, dog engaged, helical gear transmission that is rated for 900-1000 hp and had enough gear spread to allow 4.11 rear ratio and not have huge revs at highway speed. Think pro touring. I can find 3 out of 4.
I got a rally inspired 07 ford focus with a straight cut 5 speed from massive speed Racing. Its my Daily driver and my car for scca events. I love my straight cut baby.
Did you read my last comment then !? ,this video seems like a quick response then to me . Great explanation and footage love that getrag transmission with housing cut out
description on synchro engagement is slightly off. refer to bork rings and what they actually do, prior to synchro action. there is also a debate on material strength of helical vs dogbox strength. RE total surface area contact on the gears.
Quick Question. Can you bypass the ECU by pressing the clutch pedal in slightly? The reason I ask is because I seem to get better power response when pressing in the clutch pedal slightly and pressing the accelerator pedal at the same time. It's like a boost when doing this as opposed to just pressing the accelerator pedal normally. Cheers.
So, I have a question. What's better, high ratios in the box and low ratios in the diff, or low ratios in the box and high ratios in the diff? {{i.e. a 4.00 first gear with a 3.00 diff ratio, vs a 3.00 first gear and a 4.00 diff ratio. But, obviously, applied to all the gears and in a proportional fashion rather than just a random number comparison.}}
It matters a lot if it's a street car. I bought a retired drag car with 4.56 gears and the revs at 70 were insanely high. Old 56 chevy with a T10. I changed to 3.83. A little slower off the line but easier on the highway.
Great video, but did some looking and you left out the most important part of the ppg setup for stock cases that there over 14,000 dollars for a run of the mill t56 not saying it's not great stuff but it is a bit of a buzz kill then you need to pull your old one apart and swap in the guts
Because a clutch holds only as much torque as it's clamping spring allows, so a performance clutch will have stronger springs which need more force on your end to compress. Sounds while pressing the clutch are usually indicating thrust bearing problems, but racing parts might have some other oddity going on.
The noise is because they’re typically 2 or more disks without damper springs. So when released they rattle and make noise. They’re stiffer because the heavier springs increase clamping force on the plates so the clutch can hold more torque.
Very cool, think gear ratios is much simpler then people make it out. You basically want, the most granular gear ratios that means more gears as possible, but add's weight as literally more gears jamming into transmission. So like you said, you really don't have to worry about lower ratios cause your not in them ever on race track (except quarter mile). So by making the lower gear very long, you can be more granular on the top end, and that means you have more phases where you can be in the power band or torque band of the engine, and be faster.
This is the first time I've seen a motorcycle quickshifter like device, for a car. For open throttle upshifts. And couldn't the outside of the transmission case, be wraped in sound deadening material? To reduce the straight cut whine? Like between the skidplate/splitter-to diffuser-flat-belly, and the floor pan, especially around the transmission, and maybe the differential(s). Just fill that space up with sound insulation. Hex cut gears freak me out. I keep thinking of them sliding off each other. And with a flat belly car. Air entering the mouth & nose of the car, can exit out of vents & gills in the hood & fenders.
You can clutchless shift with synchros as well. Disengaging a gear is easy when you time the throttle release appropriately but engaging a gear without the clutch doesnt feel good but can be done haha!
I use to have a 95 s10 i could clutchless shift thur all the gears at rolling at idle or reving it out as high as it would go before i let off and it always shifted perfectly fine never grinded or was upset
That's me. I need and want car education anywhere anytime. Learned and corrected a lot of the things from MOTIVEDVD. Huge thanks for that. Keep up the good work Andrew 👍
Awesome vids and awesome channel. One question when you lift the gas are you cutting ignition or using a load cell shift knob for dog engagement helical gears.
I agree with everything you said but one thing, helical cut gears are generally stronger than strait cut due to the fact that there is more surface area of the teeth in contact with one another at any given moment. Strait cut gears are used a lot in racing applications because they are more efficient with less friction because there is less surface contact between gears.
Can a video be made to give good reasoning and explanations that will convince a persons significant other that a new expensive gearbox is both needed, practical and a smart purchase for the family.
Good luck
That's easy -- if the top gear reduces rpm, that would reduce engine wear, noise and gas consumption. Maybe the other person is smart and says, let's just put in a lower final ratio. The problem there is that many modern cars don't have optional final ratios.
Dual clutch's generally provide more speed and better economy. I would presume the same could be said for a straight cut or dog box since they're more efficient than a normal manual.
So not only will it save you money in fuel but it wil also mean you can get places faster which allows more time to spend with the family/better half.
Hows that?
I died when I reread that! Congratulations for reaffirming why I always read the messages!
LOL!! Yeah it's called a jewelry catalog video.
I knew nothing about sequential gearboxes before video. I feel completely comfortable talking about this topic now!
This video was exactly what I was googling for. The basic of what I wanted to know about all the different manual gearboxes. Presented in a clear and concise manner as well. Well done. Thank you.
This channel is SO underrated. Love the vids. Andrew Hawkins is the MAN!
thanks mate
Good one man very
detailing video keep it up ;-)
Andrew Hawkins; you've been feeding my thirst for car knowledge for the better part of a decade, thank you.
My daily car has factory straight cut gears, 5 speed with a nice loud cluncky gear change. Never gets old mate.
Mine too, when reversing :P
which model?
@@keegyweegy7803 1999/2000 Toyota Echo manual sedan
Always so well spoken. Barely any uhms even without a script. Excellent production quality as well.
how do you know it isn't a scripts? the script is most likely infront of the camera.
Alex Strömberg it's obvious there is no script.
Kroberter that's called a good script
Alex Strömberg sorry for assuming he was well spoken. I will never do that again, I'm really sorry.
Its great to see PPG, MotiveDVD, and TRC come together and giving us awesome content!
Couldn't be a better vid on the topic, not just the explanations but shows each in action!!
I still come back to watch this video when I need a refresher.
Is it just me - I LOVE the sound of a straight cut box! It's like the dry clutch sound of a Ducati. Awesome video and easy to understand. Thanks.
Best video about gearboxes period, was looking for perfectly layed out info like this all day!
Finally someone who doesn’t talk shit!, well done guys! Subbed 🔥
I remember meeting Andrew when he did a feature on one of mi mates cars for ignition, been around along time mate glad to see you as one of the main faces in this industry, keep on going strong mate well done
Andrew thats one of the best explanations ive ever heard for Dog and Syncro gear box's. The more you know!
Keep these coming mate, for an internet nerd like me this is pure gold
Ive been searching for a good explanation of why people call synchro teeth or splines, dog teeth, when they are not the same. This was a great breakdown!
Fascinating. You're the absolute best at explaining simply. I learned so much in a short space of time.
A "taller" 1st gear might also be used to downshift in very tight corners instead of trying to crawl out in 2nd to avoid blowing your engine in smithereens with a normal 1st gear.
Best transmission video on you tube hands down
Super well done - dog box was the one I was confused about and it seems like that confusion is because a lot of people use it incorrectly!
Great video. Well made and thought out without getting too detailed. And thank god it's not like others where some guy is rambling.
Awesome video. Super informative for the enthusiast thats not an performance technician. Pros and cons layout was superb and just what i was looking for. Thanks.
Seen plenty of tuff engined cars with crap gearbox setups, great explanation for the newbie.
Not that I’ll ever use it but now I know the different type of transmissions. Nice job
The noise from straight cuts are not a con, i love the sound!
Should have mentioned that a motorcycle cycle gearbox is sequential and dog clutch as a good example of this type of 'box. Like {Kroberter} said below, well spoken.
Very informative! Well done guys!
Excellent video! Great information; Not too much not too little and just the right amount of depth on each subtopic.
very good talker , very easy to understand everything explained really well
Extremely interested to see what you guys do next !!!
Great speech, sir. Not searching for your words. Marvelous
love the video and you are so right about how ratios impact not only performance but drivability as well.
Robert D
Way back in the day, I swapped a 5 speed close ratio in place of a 4 speed in a diesel rabbit.
Those things are soooo slow, rated 52hp.
Dropped like 5 seconds off the 0-60, felt like a comparison of it picking up 15-20hp.
Way over on the other hand, I put a close ratio behind a late model diesel and while it would rip trees out, a buddies stock model was quicker.
Very inciteful, heard these words tossed around now i am glad i can figure out a little bit more of the car community.
Well done Andrew. Very well explained and excellent footage.
Thank you, finally get good explanation of gearboxes!
Loved the info and the presentation of it. I suggest to put some less " busy" music under it so one can focus better on the video itself. :)
this explains gearboxes very well
crazy knowledge in this video !
Been looking for this exact video for ages and finally someone has made one! Cheers guys!
About time, someone made this video, cheers.
Have to point out a straight cut gear is actually weaker than a helical gear. Its just they dont generate axial load which forces to 2 gears aparts and causes teeth to get munched off.
LandRoverLife it's stronger because since 2 teeth are meshing at once instead of 2, more surface area=high load capacity
Peter Donaldson mate you might want to check your facts if size is equal helical gears are stronger because they are longer contact patch because theyre angled. Most straight cut gears replacing helical take up less room therefore can be made larger in same space. Its not to say they're stronger only that bigger teeth are stronger than smaller teeth. Once again my point is that its the axial load that causes helical gears to fail not that they are weaker
The helical gears also have higher parasitic power loss because of the sliding in and out of mesh.
Swings and roundabouts...
For the same tooth count, a helical gear is thinner in the loaded direction - approximately 90 degrees to the tooth face helix.
A helical gear is point loaded, with a sliding action, whereas a spur/straight cut gear is loaded across the full width of the gear - so it has a higher stress on a smaller load bearing part of the tooth - you can verify that with a simple vector diagram.
A helical gear has a higher axial force on the end thrust faces/bearings, which increases with the helix angle, and 'may' increase case loading and distortion.
Despite the common misconception (even seen here) there is still a single tooth contact for most of the rotation of the gears, except the very small period when the load is transferred from one pair/set to the next.
Where a helical gearbox has a big advantage is in reducing the backlash/chatter/shunting as torque is transferred more smoothly between the loaded teeth as the shafts rotate, which means they are much, much quieter - spur gears can be made relatively quiet ( I have known an instance where it sounded just like any normal helical type - but that was a single example), but the tooth design and manufacturing is expensive as the tolerances and design has to be right.
Thank you, I was just about to write this.
Nothing breaks my heart more than high rpm miss shifts 😅😅
OUCHIE-OUCHOUCHOUCH!!!!
If you cant find em'
Grind em'
BurnRubberNotYourSoul!!!
Andrew, I'd love to see a video like this on popular drag racing automatics as well.
That PPG gear box is a 32 33 box ? Is that kit a 6 speed conversion?
You guys are top notch. Keep it up. The world needs you
Excellent explaination Mr Hawkins
Thank you!
This article synchronized my ideas about gearboxes.
Q: is there a way to identify if a gear teeth is broken?
Bcs a loose piece of metal can destroy the entire gearbox.
I'm loving this new segment. Thanks
SUBBED! so what kind of trans is a Jericho? It only needs clutch engsgement in first gear but what does that mean hardware wise?
Your gtr gear and diff ratios are close to my 3.7 Cyclone swapped rx7(mt82&8.8irs)
Could you not make it so you can go into neutral if you pull a lever and shift either up or down
Very well explained and put together video Andrew. Was just wondering when the next video would be out about your sr20 with ve head?
Correct me if my wrong but i believe the only production car that came with a optional sequential gearbox is the ccxr
How do you engage reverse on a sequential gearbox? My only experience with sequential transmissions is with motorcycles or what BMW calls their sequential transmission, which is basically a manual transmission with an electro-hydraulic clutch.
I like that noise of a straight cut gearbox
Great technical information and very presented!
Great video. I was excited when I saw the screen showing gears for the 6 speed until I saw that it was for a GT-R. I was looking for a sequential shifted, dog engaged, helical gear transmission that is rated for 900-1000 hp and had enough gear spread to allow 4.11 rear ratio and not have huge revs at highway speed. Think pro touring. I can find 3 out of 4.
Our car doesnt have huge revs on the highway. Only slightly more than factoy overdrive
Engineering is just incredible. How on earth did a group of people manage to make a component that is so precise and methodical? Astounding to me.
I got a rally inspired 07 ford focus with a straight cut 5 speed from massive speed Racing. Its my Daily driver and my car for scca events. I love my straight cut baby.
Great info and very well explained. Learned quite a bit thanks.
Did you read my last comment then !? ,this video seems like a quick response then to me . Great explanation and footage love that getrag transmission with housing cut out
Good thing I love the loud sound of straight cut gears, I know a lot of people hate them
Would you say a sequential dog engagement is faster shifting than modern day automatics?
8:53...best sound in the world I think. That rally sound
Hi Andrew can you do a video on Diffs and diff gear ratios and what it means in the GT-R performance wise ?
WOW! Excellent video. Thank you very much for a concise explanation.
description on synchro engagement is slightly off. refer to bork rings and what they actually do, prior to synchro action.
there is also a debate on material strength of helical vs dogbox strength. RE total surface area contact on the gears.
Good stuff Andrew... One day I'll be able to get one of those badass sequentials!
great video, I learnt heaps
Quick Question. Can you bypass the ECU by pressing the clutch pedal in slightly? The reason I ask is because I seem to get better power response when pressing in the clutch pedal slightly and pressing the accelerator pedal at the same time. It's like a boost when doing this as opposed to just pressing the accelerator pedal normally. Cheers.
Just discovered your channel, you got me hooked, meat & potatoes.... ....that's all we want!
So, I have a question. What's better, high ratios in the box and low ratios in the diff, or low ratios in the box and high ratios in the diff? {{i.e. a 4.00 first gear with a 3.00 diff ratio, vs a 3.00 first gear and a 4.00 diff ratio. But, obviously, applied to all the gears and in a proportional fashion rather than just a random number comparison.}}
It matters a lot if it's a street car. I bought a retired drag car with 4.56 gears and the revs at 70 were insanely high. Old 56 chevy with a T10. I changed to 3.83. A little slower off the line but easier on the highway.
Thanks for the info, cool vid. I love my T56 and probably will never change it for anything, just to much fun imo :)
Great video, super informative and no nonsense!
Are helical geared dog box trans easier to downshift than straight cut gear dog box transmissions?
Great info! Also, nice studio and lighting :)
well executed explanation in short time frame :)
I first saw you in an old drift dvd (can't remember the name). Cool that you're on UA-cam.
I just want a long first, 2 3 4 5 close together and then a long 6 for the highway.
my dream gearbox for my s13 ca18det 😅
my old t5 m7003a uses that idea. hated it and put a .80od gear in it to replace the .63
Just come across your channel, nicely explained, easy to understand facts looking forward to seeing more 👍🏻
I love this channel already
Great video, but did some looking and you left out the most important part of the ppg setup for stock cases that there over 14,000 dollars for a run of the mill t56 not saying it's not great stuff but it is a bit of a buzz kill then you need to pull your old one apart and swap in the guts
Why racing clutch is requires greater force to be pressed using our foot ? And why i have that ‘kringkring’ sound when it is engaged ?
Because a clutch holds only as much torque as it's clamping spring allows, so a performance clutch will have stronger springs which need more force on your end to compress.
Sounds while pressing the clutch are usually indicating thrust bearing problems, but racing parts might have some other oddity going on.
The noise is because they’re typically 2 or more disks without damper springs. So when released they rattle and make noise. They’re stiffer because the heavier springs increase clamping force on the plates so the clutch can hold more torque.
The pedal feel has a lot to do with the the type of pressure plate as well for example a 2 finger versus diaphragm.
Very cool, think gear ratios is much simpler then people make it out. You basically want, the most granular gear ratios that means more gears as possible, but add's weight as literally more gears jamming into transmission. So like you said, you really don't have to worry about lower ratios cause your not in them ever on race track (except quarter mile). So by making the lower gear very long, you can be more granular on the top end, and that means you have more phases where you can be in the power band or torque band of the engine, and be faster.
This is the first time I've seen a motorcycle quickshifter like device, for a car. For open throttle upshifts.
And couldn't the outside of the transmission case, be wraped in sound deadening material? To reduce the straight cut whine?
Like between the skidplate/splitter-to diffuser-flat-belly, and the floor pan, especially around the transmission, and maybe the differential(s). Just fill that space up with sound insulation.
Hex cut gears freak me out. I keep thinking of them sliding off each other.
And with a flat belly car. Air entering the mouth & nose of the car, can exit out of vents & gills in the hood & fenders.
Great vid. Wish I could get a affordable sequential helix for my RX7 FC for the track.
You can clutchless shift with synchros as well. Disengaging a gear is easy when you time the throttle release appropriately but engaging a gear without the clutch doesnt feel good but can be done haha!
it can be done while rev matching and doing it slowly. Try it at 9000rpm flat out
I use to have a 95 s10 i could clutchless shift thur all the gears at rolling at idle or reving it out as high as it would go before i let off and it always shifted perfectly fine never grinded or was upset
Is it possible to change gears without clutch on H pattern if you have dog gears ?
sounds like this was a follow up to the visit from 1320 and them not understanding gearboxes
Mitchvr we just like to educate those who need or want educating 👌
That's me. I need and want car education anywhere anytime. Learned and corrected a lot of the things from MOTIVEDVD. Huge thanks for that. Keep up the good work Andrew 👍
my gtr gearbox is starting to grind every now and than, hope some redline heavy will keep me going a bit longer lol
Love your vids man!
Hats off to you, very well explained!
Awesome vids and awesome channel. One question when you lift the gas are you cutting ignition or using a load cell shift knob for dog engagement helical gears.
You can either lift or cut the ignition to unload transmission and make the shift.
Very good video mate!
Great video. Very interesting and informative!
Very good and knowledgeable video. Well done.
Any advantage of a dogbox compared to a DCT?
Is there a difference between faceplated and dog engagement?
I agree with everything you said but one thing, helical cut gears are generally stronger than strait cut due to the fact that there is more surface area of the teeth in contact with one another at any given moment. Strait cut gears are used a lot in racing applications because they are more efficient with less friction because there is less surface contact between gears.
Read our comment in the description. There is so many variables when it comes to gear strength we could have spoken about that for hours.