K50 Gearbox

[Tiger]

OK... this may be a funny question to ask, but I feel no harm in asking?

Can K50 5 Speeds put up with anything up to 200bhp? Or will they become schrapnel internally before long? Is there a contact to build these boxes strong enough to withstand more power? Could T50 innards fit inside a K50 if this being the case? Is it WORTH building up one of these boxes?

I have run a sarch on this topic before asking and I haven't found anything that really answers this question... so any help on this question would be appreciate it.

 

I intend on keeping a 5K motor in the KE55 for a little bit, if this is of importance.

 

Cheers

[Tiger]

Maybe 200bhp is a far fetched figure.

 

I just realised what what I posted then. Try 120-130bhp from a 5K.

 

I seriously wouldn't want to get a Supra 5 speed for a 5K... I'd save that for a 1GGTTE or SR20DET or something of that nature.

[Super Jamie]

Can K50 5 Speeds put up with anything up to 200bhp? Or will they become schrapnel internally before long? Is there a contact to build these boxes strong enough to withstand more power? Could T50 innards fit inside a K50 if this being the case? Is it WORTH building up one of these boxes?

no, yes, no, no, no

 

a 5 speed will stand up to 5k power levels forever if you treat it nicely. if you go around launching and snapchanging everywhere then you'll be wanting to have lots of layshafts and second gears handy. having a freshly rebuilt box with new bearings and synchros will help the cause, but if you're killing boxes constantly you'd probably be better spending the $250+ that would cost on a T50 and K bellhousing, convert to hydro clutch and never worry about it again

 

i personally am going to get my spare good K50 rebuilt. my current box is a bit crunchy but it's been standing up to occasional punishment pretty well. 20 yearold synchros don't like shifting at 8500rpm for some reason :dance:

[Redwarf]

Maybe 200bhp is a far fetched figure.

 

I just realised what what I posted then. Try 120-130bhp from a 5K.

 

I seriously wouldn't want to get a Supra 5 speed for a 5K... I'd save that for a 1GGTTE or SR20DET or something of that nature.

I have around 115hp from my 3K, and the 4 speeds hold up reasonably well, however I have had 3rd gear exit stage left on two boxes, when they decided they didn't like being jumped. Word of mouth is that 5 speeds aren't quite as tough as 4 speeds, but they'll still cop punishment.

[Tiger]

T50 and K bellhousing, convert to hydro clutch and never worry about it again

I actually like that idea, dude. Cheers :dance:

Hydro clutch conversion wouldn't be an expensive issue? Or it would be?

 

I admit, I am gonna be giving the car abit of stick here and there.

 

T50... Celica 5 speed, the steel case.... yeah?

 

If this is true, I have been given a quote on a steel case 5 speed, which I may consider seriously.

 

So all up, K50s don't like mistreatment...

[Super Jamie]

steel 5 speed is a W50, which all the rotor boys love. corona 4 speed is W40

alloy 5 speed is W55-58

T50 is T50

 

hydro clutch is pretty easy, check jonny's webpage. basically a ta22 master cylinder bolts up, and you cut cut weld weld the stock clutch pedal to suit. fook could tell you how he did his as well

[kangaroosa]

I have a K50 behind my hot 5K and havent had any problems so far.

I also had a K50 behind my 4K, but broke two teeth off second gear after a quick shift. I must admit that the box that broke, put up with a heap of punishment for about 4 years. That time included about 3 years with a locker, which i imagine reduced its life span considerably.

So in my opinion, the K50's are pretty strong. As long as you don't give them a hard time day in and day out.

 

If you want the piece of mind of knowing that you have a strong gearbox, then go for the T50 or W* series box.

 

The only other problem is - If you don't break a gearbox, then generally something else fails in the driveline. Unless you upgrade other driveline components. I suppose a clutch is cheaper to replace anyway.

[Redwarf]

I can only talk about the K40's, but I think they're a strong little box for what they were built for. I had the one gearbox in Dwarf for almost 10years before it let go. Sadly, the replacements haven't been as robust. :dance:

[demuire]

I haven't had any luck whatsoever with T50 boxes (on my 5th box in 12 months, and it's sounding like it wants to die too), but that's probably just me, because everyone else I talk to hasn't had any problems. My car was dynoed at 69hp at the wheels.

[Xany]

i've got a K50 in my car atm.....and its holding up quite well, however i've gone through 2 boxes so far in the last 18months.....one of them second gear let go....stripped all the teeth off it....you might find a picture of it on here somewhere.

 

the second box i chipped a tooth off reverse gear....we all know not to clutch start in reverse.....thats the reason..... :dance:

[Redwarf]

They end up looking like this:

[Tiger]

OUCH!!!!!

 

OK, thanks for the warning, dude! :dance: hahaha

 

Well, I won't be giving my car full time hell, but I will stick it here and there, a few rev and dumps, occasionally heel-and-toe driving, but I think once the install is done, I'll be cruising with it mainly. Just straight line blasting if anything, not sideways on corners (unless it's wet, of course)

 

So I may hold out with the current K50 but if I wish to update, I'll go the steel case Celica 5 Speed. Usually I change the clutch to a more heavy duty unit regardless of any car I pick up for myself, so that should keep the gearbox safe for a while.

[Xany]

ummm..... just to let you know....

 

if you go for a heavy duty clutch, the gearbox is more prone to breaking....because basically there will be more force as the clutch wont slip as much..

 

and i wouldnt go dumping the clutch too much, if at all at higher rpms.....this is coming from a guy thats done it all before.

[Tiger]

I'll take your word for it, dude.. thanks for the advise.

I don't mind behaving with standard gear :dance:

But heavily modified gear (much later) I won't be so easy on.

 

And I honestly thought that putting in a H/D clutch would've helped a little. In my last rolla, I put in a "stage 2" RPM clutch and it was not bad at all... I did give it some fanging here and there, though... that's for sure.

 

Hmm....so you think just keeping a standard clutch will be better for it?

[Xany]

well if you are going to try and bolt up a t50 to it you'll have to change to a new clutch anyway....so i'd just stick with a normal clutch for now then go heavy duty when you go with the t50