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Pushit2.0 · 06-12-2011

I think the Grinding gears does throw a few people off, the only gears that "move" inside the tranny on a dsm for shifting is reverse, and even then there is a synchro on reverse but it just stops the input shaft to select reverse.

As said above when you shift a synchro tranny the gears are always in mesh and spinning, but you are moving a hub that is on a slider that is attached to the main shaft. The hub applies force to the synchro ring to match the shaft speed to the gear speed to engage that gear. They use what is known as Dogs to apply the force from the hup to the synchro ring and match the speed. The synchros are also known as the breaks in a MT. So when you have a double or triple synchro you are making your "breaking" surface a lot bigger then a single synchro.

http://www.google.com/imgres?imgurl=...w=1920&bih=975

So on the left they show the neutral position for that gear.

And the middle they show you selecting that gear, so you are moving the slider onto the gear, as you do this it applies force threw the dogs to push the synchro onto the gear and match there speeds.

Then in the last pic it shows the hub fully engaged onto the gear, so the hub is on the out side and the dog is in the middle of the last pick, in the dsm tranny there are 3 of these for each gear. And the dogs have spring clips on both sides to help hold them in place, but I suspect under rpm its centrifugal force that pushes the dogs into the hub, and as you move the hub up or down to select a gear it pushes the dogs in to "grab" and push the synchro into the gear you are selecting.

Goodhart is talking about "Pro shifting" a tranny, that does not solve my problem. My tranny shifts great at 10,000rpm, but the gears are not strong enough to handle the crazy hp my car makes.

Doing a pro shift makes a synchro tranny shift like a dog box, or a motor cycle but the gears are not stronger because they are stock gears cut up in a mill.

http://www.google.com/imgres?imgurl=...w=1920&bih=975

Here they show a pro shifted tranny, its stock gears with dog engagement.

http://www.sheptrans.com/dogbox/dsm_awd.htm

This is a true dog box, with dog engagement and straight cut gears.

~John

06-12-2011	#700
Pushit2.0 15min late to the world 12 Babes of Christmas Champion! 3D Championship Golf Champion! Drag Race Champion! Drifting Champion! Duck Hunter Champion! Street Racer Champion! Tire Toss Champion! Join Date: Oct 2003 Location: getting a monster Drives: a moon taxi Posts: 3,692	Re: 91 Galant VR4 I think the Grinding gears does throw a few people off, the only gears that "move" inside the tranny on a dsm for shifting is reverse, and even then there is a synchro on reverse but it just stops the input shaft to select reverse. As said above when you shift a synchro tranny the gears are always in mesh and spinning, but you are moving a hub that is on a slider that is attached to the main shaft. The hub applies force to the synchro ring to match the shaft speed to the gear speed to engage that gear. They use what is known as Dogs to apply the force from the hup to the synchro ring and match the speed. The synchros are also known as the breaks in a MT. So when you have a double or triple synchro you are making your "breaking" surface a lot bigger then a single synchro. http://www.google.com/imgres?imgurl=...w=1920&bih=975 So on the left they show the neutral position for that gear. And the middle they show you selecting that gear, so you are moving the slider onto the gear, as you do this it applies force threw the dogs to push the synchro onto the gear and match there speeds. Then in the last pic it shows the hub fully engaged onto the gear, so the hub is on the out side and the dog is in the middle of the last pick, in the dsm tranny there are 3 of these for each gear. And the dogs have spring clips on both sides to help hold them in place, but I suspect under rpm its centrifugal force that pushes the dogs into the hub, and as you move the hub up or down to select a gear it pushes the dogs in to "grab" and push the synchro into the gear you are selecting. Goodhart is talking about "Pro shifting" a tranny, that does not solve my problem. My tranny shifts great at 10,000rpm, but the gears are not strong enough to handle the crazy hp my car makes. Doing a pro shift makes a synchro tranny shift like a dog box, or a motor cycle but the gears are not stronger because they are stock gears cut up in a mill. http://www.google.com/imgres?imgurl=...w=1920&bih=975 Here they show a pro shifted tranny, its stock gears with dog engagement. http://www.sheptrans.com/dogbox/dsm_awd.htm This is a true dog box, with dog engagement and straight cut gears. ~John __________________ Moon taxi: 9.45@156.9 mph 41psi 2011... Letting people down sense 2012. Last edited by Pushit2.0; 06-12-2011 at 09:17 PM..