hey i have a 1jz pickup with a manual r154 transmission from a supra... but my question is if i can upgrade the clutch master cylinder from the 1992 2wd pickup to lets say a 4wd pickup or a 4runner? do you think the master cylinder would have more travel in those vehicles?

my issue is that i find i have to push the clutch all the way down to shift nice and smooth and i dont really like the way it feels... i adjusted the pedal already but still not enough... im wondering if a bigger master cylinder for the clutch would help...

thanks guys

 

I just checked half a dozen cars at rockauto, MKIII supra turbo (has R154), the p/u, 4runner, 98 taco, etc....all have 5/8 bore master cylinder. You might have to look at an aftermarket upgrade if you want bigger.

AFAIK low engaging clutch means there's lots left: a good thing. Annoying when switching cars, but a good thing.

How did you adjust your pedal? tighten the rod linkage or change the stops? DON'T overtighten the rod or you'll blow the cylinders because they can't adjust. Without changing master cylinders you will have to increase the total travel of the pedal, either making it higher when released or push further down (obviously down is limited by the floor and up is limited by the bracket) by altering the position of the stops.

 

i had this same issue in my celica.

i put a w58 in and ended up getting the slaves mixed up.


after some research i found the bore to be the same, the rod was the same, but there was a ever so slight difference in mounting the mounting tabs that reduced the throw.

put the correct slave on and bam, fixed the issue.

in my research i found more then a few people that used the wrong clutch fork or throwout bearing mounting bit. which caused the same issue.


either way, there is something that doesnt quite travel as far as it should, and least likely is the pedal/master.