|
Post by coondog on Dec 28, 2015 10:25:50 GMT -5
Ok, so its time to try something different to bring the rpms down @ 70mph.
I am a transmission builder, and happen to own a justy, and I think I should do something about this high-revving transmission condition.
A few ideas I am tossing around are: -Changing the final drive ratio or -swapping the gears that make 5th gear.
Swapping the gears seems most logical, since 4th and 5th are very close in ratio, and would least likely affect driveability. But if there is a final drive swap I am able to do, that could also be a feasible option. Seems like I read a thread on here about the CVT and 5 spd transmissions having the same, or similar ratios.
I could also source the gears needed to make a more desirable ratio, if anyone had a lead on what I can grab them out of or, where a miracle kit could be purchases.
I've done a lot of odd honda transmission configurations for guys, but they brought me the parts, and I assembled everything. But then again, for these little honda guys, there is a lot of info available for making weird transmission setups, as far as what gears to use from what transmission to get the best ratios.
Any advice appreciated.
|
|
|
Post by coondog on Dec 28, 2015 11:23:40 GMT -5
Looks like there is a pretty big difference in the final drive of the FWD M/T vs the 4WD M/T in a justy. So I am wondering if the gear on the countershaft and the differential are interchangeable. Because the 5th gear in the 2wd is not as much as an overdive as the 5th gear of a 4wd, it allows them to use a 4.437 final drive, but I am guessing that since the 5th gear of the 4wd is more of an overdrive, they use the final drive @ 5.200...
We might be on to something?
|
|
|
Post by hollandjusty on Dec 28, 2015 11:34:26 GMT -5
|
|
|
Post by coondog on Dec 28, 2015 16:41:35 GMT -5
Good input, I enjoyed that read. Seems like his final drive is the highest possible, but I was thinking about doing the opposite of what his rally build has. I am still reasearching to find out if I can use the 1st gen 2wd final drive mated to my 2nd gen 4wd gearset to see if that will net me the lower rpms at 70mph. Seems like the hugh difference in final drive ration could do wonders and possibly set a new precedent for us that get out on the highway some. I use my justy mostly for getting from where I live to the mountains, where I need the 4x4 frequently, but there is also 150 miles of highway to drive to get there, so thats why I am mainly thinking of doing this.
If I can get some decent leads on whether or not this is possible, I will be testing some cool stuff that might provide a solution for the high rpm problem we all face.
Swapping the final drive gears from these two transmissions looks do-able according to the information ive looked at. But hopefully some others will experience on this will chime in.
I'll kick back and wait to see what other info pops up on this thread.
|
|
|
Post by ricer84 on Dec 30, 2015 16:08:55 GMT -5
hope this works so badly. I would love to bring the revs down above 70 MHP.
|
|
|
Post by coondog on Jan 7, 2016 13:45:26 GMT -5
hope this works so badly. I would love to bring the revs down above 70 MHP. I am working on locating a doner transmission to take apart and mess with. I have a hard time finding parts cars in my area, and just cant seem to find something locally. I want to take my trans apart and see what I can fit in it, but my DD is down right now, and so I have been driving the justy to work.
|
|