I don't drive my car that often, but just a few days ago I drove it in traffic and the tranny became clunky again after a period of stop and go traffic. I can only imagine how hot the transmission fluid is

There's gotta be a fix somewhere. Tranny oil cooler anyone?

 

Maybe it's time to replace the tranny fluid?

 

Read the thread by cmnsnse. He's working on redesigning the synchros. He's already rebuilt one S2K tranny. Should be interesting to see what he can do.

 

Funny, my transmission is still very notchy also when warmed up. When my car is first driven in the day, my transmission feels very smooth, and also during nights when cold, it seems like my transmission is very smooth. I thought it was suppose to be the opposite?

 

Hey guys!

Guess what? My local service department tells me (last week) Oh we have a transmission for you, so let us know when you want us to put it in . . . well OK then . . .

So I load it up onto the trailer and drop it off (in pieces, without a tranny) and ask how long they think it will take them. I'm thinking about 4-5 hours is generous enough if they're experienced - remember they have to only put it in . . . the guy says about a day. I say ok so how many tranny's have you done? Turns out mine's their first one I've already pulled mine 5 times, crazy I know and I don't have a lift. First time it took me a day to get it out and a day to get it back in . . . now I can do it all in a short day . . .

Anyway, I have the 'other' tranny ready to modify. Ill start in a week or so, there may be an easy fix for the nochy-ness but I wont get into my theorys until I get a chance to play with it all.

Things I want to do:
Oil pump pickup - maybe a one-off exotic filter system - hey you could put a cooler on it
Syncro mod - basically a different profile with more metal (means welding and machining)
Reverse mod - making the teeth sharper so its easier to 'find' reverse I know they are quite blunt, possibly to reduce the chance of them braking off. Here is my mod PIC:

Shift effort - while I think the effort is low, it seems to be too robotic and less refined than it should be. I guess you could call part of that the nochy-ness.

I'll be sure to update everyone- I'm still not done with that other thread, gotta get those darn video's up - Shatten has 'em -

 

cool... keep us updated!!!

 

Im happy to say I am making some progress

I have finished work on the notchy shifting, and believe me its MUCH better.

Since the stiff springs and balls are only meant to hold the rods and forks in the right place and not withstand load, the spring pressure can be reduced a little bit. I got my hands on the perfect thing, precision washers .5mm thick and they fit perfectly on the spring retainers, reducing the pronounced 'Snick' to a gentle 'click'

The notchyness within the stroke of the shifter is integral to its operation, but it doesn't hurt to isolate it from the shifter by changing the hard plastic piece at the bottom to a softer urethane. Its kind of embarrassing to admit the material I used so I wont, but Ill see about getting some custom pieces made up specifically for this application.

Who's bragging about smooth as butter?? Gimme another month and Ill have the whole thing done, including the oil cooler/filter system

I just gotta get some work done on my other cars! I've pretty much ignored them since I bought the S2000 about 2.5 years ago

 

We discussed a cooler once before.. but $600 is an expensive experiment..

https://www.s2ki.com/forums/showthread.php?...smission+cooler

 

Yeah but thing is, our tranny's Have an oil pump w/ pressure

I like the idea of a filter also, a radiator plus filter shouldnt cost more than a couple hundred after its all said and done. And even just an external oil filter would have a significant cooling effect.

I can sump straight off the bottom(or at least just to the side for ground clearance) filter it and run it back into the pickup. Block off the original pickup, and bolt right into the original filter housing.

K.I.S.S. keep it simple stupid, lol ya think about something enough you just might find an easier way, beleive me I've thought of about 20 different set ups already.

As a matter of fact, I was thinking about changing the ramps on the synchro sleevs but it would be so much easier to find a ring, or have one made that is stiffer or thicker by .0005"
Since the notchy feel is fixed on my box, Ill build a little more resistance into the shift to combat the grind.

I know people think its a lubricant problem, but its not, the cones work just fine. Its those little spring rings, they deflect easier when hot - putting less force on the cones for a shorter period of time.

 

simple question, is this notchy feeling bad for the tranny? Mine is tough when cold then 10 minutes later is smooth then after driving for a while will be notchy in 2nd and 3rd.