5 speed carnage
So I took apart my busted 5 speed:
http://lh3.ggpht.com/_RVtFpHgZITY/Sr...2/IMG_0027.JPG Here are the guts: http://lh6.ggpht.com/_RVtFpHgZITY/Sr...2/IMG_0017.JPG Where'd 3rd gear go? http://lh6.ggpht.com/_RVtFpHgZITY/Sr...2/IMG_0021.JPG Here it is! http://lh6.ggpht.com/_RVtFpHgZITY/Sr...2/IMG_0020.JPG What sucks is the syncros in this transmission are in perfect shape and it used to shift perfectly. The new (to me) one doesn't shift quite as nicely. This is kinda cool: http://lh5.ggpht.com/_RVtFpHgZITY/Sr...2/IMG_0023.JPG It's kind of a trough that collects oil and feeds the driveshaft bearing here: http://lh3.ggpht.com/_RVtFpHgZITY/Sr...2/IMG_0026.JPG Damnit I need a 6 speed. |
Wow that is brutal. I'm scared for my trans now :|
|
This is exactly why I shift my car slow like a pussy
|
Did it free-rev in 3rd? My tranny acted the same in 3rd as it did in neutral after I toasted it - I could put it in 3rd, let the clutch out, and get out of the car, and it wouldn't go anywhere. :bang:
|
Originally Posted by bryanlow
(Post 455019)
Is it not possible to just swap the 3rd gears out? |
I'm betting my 3rd gear is going to look like that soon.
__________________ Best Car Insurance | Auto Protection Today | FREE Trade-In Quote |
It is possible to swap gears, and replace broken ones. But unless it's a qualfie set, it's just going to break again. It looks like Mazda used a pretty steep helix angle to get rid of noise, if I'm not mistaken that's part of the reason the gears aren't terribly strong. That amd material I'm guessing.
|
Originally Posted by levnubhin
(Post 455119)
I'm betting my 3rd gear is going to look like that soon.
|
So who here's gunna try sourcing a tougher gear set to swap in that doesn't cost 3k like Queef?
|
Originally Posted by icantthink4155
(Post 455115)
I know nothing about transmissions, could someone take this pic and label 1st, 2nd, 4th, 5th, and reverse?
http://img39.imagefra.me/img/img39/2...pm_ab78008.png The main gear is always engaged on both the main shaft and the countershaft. The division between the input and output halves of the main shaft is just after (above) the main gear. All countergears are continuously engaged on the countershaft. The main gear drives the countershaft, and the four countergears continuously drive their mating gears on the main shaft. To select 1, 2, 3, or 5, the appropriate output gear is locked to the main output shaft, with the other output gears freewheeling. There is no 4'th gear per se. As 4'th is 1:1, to achieve that ratio, the input shaft and the output shaft are simply locked together, and the countershaft freewheels all of the main gears. Reverse is similar, but with one additional gear in the lineup- the reverse countergear drives an idler gear, and then the idler gear drives the reverse main output gear. |
I've said before, 3k for a transmission gear set from qualfie is very reasonable. Keep in mind a ring/pinion set is not terribly precise aside from a ground bore. Theyre a meshed set, meaning the more you run it, the more the pinion grinds into the ring. You can see from Joe perez's recent write up about his new gear set that the lathe grooves are still visible. Look up the price for a ring pinion gear set from a reputable gear company like qualfie, and times it by the six (I think reverse is included) gears you get with a transmission set, and add in the money to make the gears somewere near a quality class 12, and you should be somewhere near their price. Kudos to whoever prooves me wrong and makes a cheaper set, but I'd be incredibly surpised if it were possible.
|
Originally Posted by Savington
(Post 455036)
Did it free-rev in 3rd? My tranny acted the same in 3rd as it did in neutral after I toasted it - I could put it in 3rd, let the clutch out, and get out of the car, and it wouldn't go anywhere. :bang:
Originally Posted by icantthink4155
(Post 455115)
Is it not possible to just swap the 3rd gears out?
Originally Posted by Joe Perez
(Post 455218)
Here:
http://img39.imagefra.me/img/img39/2...pm_ab78008.png There is no 4'th gear per se. As 4'th is 1:1, to achieve that ratio, the input shaft and the output shaft are simply locked together, and the countershaft freewheels all of the main gears. Joe, you're badass. I was wondering where 4th gear was. |
Originally Posted by Joe Perez
(Post 455218)
. . .There is no 4'th gear per se. As 4'th is 1:1, to achieve that ratio, the input shaft and the output shaft are simply locked together, and the countershaft freewheels all of the main gears.
|
Additional information:
HowStuffWorks "How Manual Transmissions Work" There is a manual transmission simulator in that article that lets you switch gears and watch what happens in the transmission. |
Old thread, but does anyone still have Joe's picture of the 5speed with the labeled gears? If so, can you post it or send it to me?
|
Would it be impossible to just source some straight cut gears from another transmission that are the same size.
|
No OEM gears will either fit, be strong enough, or are straight cut. Or any combination of the three.
|
Has anyone ever treated some stock gears? Cryo or other wise... Or would the cost vs outcome not be worth it?
|
The cheapest answer to "How do I make my 5spd stronger" is "Buy a used 6spd."
|
^^^ All well and good....unless you are concerned about the gearing in the 6 speed SUCKING^^^
|
The 5 speed is bad enough, I can only imagine haw bad the 6 speed is. What about John Shepherd, anyone ever contacted them?
|
FM says they are building a T5 transmission housing for the Miata. I asked to be first on the list... If that takes to long, I'm going with a full race transmission $5,500.... With over 500 hp I'll need it.
|
Originally Posted by TNTUBA
(Post 796899)
^^^ All well and good....unless you are concerned about the gearing in the 6 speed SUCKING^^^
Or buy a R&P. |
When I talked to FM a few weeks ago about the T5 I asked about their timing for it and was told not to wait on it.
|
Everything else I've done is top notch so I guess I'll drop the money on the best.
|
Hello from Chile ¿Why don`t try using RX7 TurboII transmision?
I use it on my 265rwhp Miata 1.6 and never had any problem. You just have to make the plate adaptor, weld some mounts and cut the driveshaft. |
If my car actually made some kind of real power, mine would look like this after the first hard pull. My trans sounds like a soup can full of marbles when I am fully on or off the throttle. Go me, running it dry with no oil for 10 miles. :facepalm: It's held up for 3 years since then though.
|
I guess I should be knocking on wood. I've been beating the shit out of my 5spd with just shy of 300whp, track days, hill climbs, drag racing etc. and so far no breakage.
Originally Posted by johnT
(Post 801878)
Hello from Chile ¿Why don`t try using RX7 TurboII transmision?
I use it on my 265rwhp Miata 1.6 and never had any problem. You just have to make the plate adaptor, weld some mounts and cut the driveshaft. |
I'm going to try this:
http://www.motoiq.com/magazine_artic...nion-gear.aspx At least cryo and shot peening. I haven't decided 100% on WPC or not. It couldn't hurt, but it would cost several hundred dollars, and I don't know if I want to put that kind of cash into a trans that may still be a time bomb when I'm done with it. |
I don't understand why after all that work, they didn't remove the bearing? Seems stupid.
|
Because the cryo and WPC treatment helps the bearing just like it helps the other working surfaces. I won't argue that it seems sloppy not to pull it off and treat it separately, though.
|
All times are GMT -4. The time now is 11:46 PM. |
© 2024 MH Sub I, LLC dba Internet Brands