i picked up a set of rugger diffs the other day and have decided to throw them under my fez,
i will be using rear fez springs up front as well.
what are the important things to look out for?
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have diffs will sas
Moderator: Tiny
have diffs will sas
dont follow its going to hurt
Being blunt - they will be a disaster !
Highway revs will be waaaay to low IMO, 5th will be unuseable.
Feroza's low range is around 1.7 which is too high as stock let alone the wrong diffs and tyres. Feroza's also don't have excess power or torque so it all gets worse not better
I know there's lots of people on outers who are negative, but IMO this is a really bad idea. Spend some time with a gearing calculator ( lots on the internet ) and it will give you some idea of the magnitude of the problem. Around 3500 RPM @100k in 5th wouldn't be bad for a stockish engine.
As for low range crawl, a good place to start is 60:1+ on 31's, my guess is you would be lucky to get 25:1.... I am running around 160:1 includung the torque converer.
Some deep though now will save you lots of work, money and eventual misery.
Highway revs will be waaaay to low IMO, 5th will be unuseable.
Feroza's low range is around 1.7 which is too high as stock let alone the wrong diffs and tyres. Feroza's also don't have excess power or torque so it all gets worse not better
I know there's lots of people on outers who are negative, but IMO this is a really bad idea. Spend some time with a gearing calculator ( lots on the internet ) and it will give you some idea of the magnitude of the problem. Around 3500 RPM @100k in 5th wouldn't be bad for a stockish engine.
As for low range crawl, a good place to start is 60:1+ on 31's, my guess is you would be lucky to get 25:1.... I am running around 160:1 includung the torque converer.
Some deep though now will save you lots of work, money and eventual misery.
( usual disclaimers )
It seemed like a much better idea when I started it than it does now.
It seemed like a much better idea when I started it than it does now.
can you please explain this to me im not up with all the ratios etc. i'll also wont be running under 31's once i do the conversion. it will then be followd by a engine/drive chain upgrade. and im willing to loose top end speed if im correct in my thinking for the ability to go more places
dont follow its going to hurt
you will be adding a shitload of topend speed, and the gearing will be way to high offroad.2roky wrote:can you please explain this to me im not up with all the ratios etc. i'll also wont be running under 31's once i do the conversion. it will then be followd by a engine/drive chain upgrade. and im willing to loose top end speed if im correct in my thinking for the ability to go more places
Crawl ratio = diff ratio x low range ratio x 1st gear ratio
If its an auto then you can multiple by the converter stall ratio as well, but some will not agree so thats up to you - or irrelevant.
As for road speed.... if for example you half the diff ratio you car will do twice the speed as it did before at the same engine rpm.
In practice what it really means is that at 100k for example the engine will be doing half the rpm and thats impractical as the engine needs rpm to develop enough power to push you along.
So you need to know the transmission gear ratios, the diff ratio and the tyre diameter to calculate if the engine will be operating at a useable rpm at your targeted driving speed.
Same thing applies for a transplant, no matter how good the engine is if its wrongly geared it performance will be unsatisfactory.
Try talking to a few transmission rebuilders if you cant do the calcs yourself. You can download Feroza manuals from warfs.org which will give you the Feroza specs.
Randomly fitting mechanical components without a significant amount of understanding of how they all interact is VERY unlikely to work out.
Still you seem to have lots of energy and if you couple that with a sound design you could end up with a great toy.
If its an auto then you can multiple by the converter stall ratio as well, but some will not agree so thats up to you - or irrelevant.
As for road speed.... if for example you half the diff ratio you car will do twice the speed as it did before at the same engine rpm.
In practice what it really means is that at 100k for example the engine will be doing half the rpm and thats impractical as the engine needs rpm to develop enough power to push you along.
So you need to know the transmission gear ratios, the diff ratio and the tyre diameter to calculate if the engine will be operating at a useable rpm at your targeted driving speed.
Same thing applies for a transplant, no matter how good the engine is if its wrongly geared it performance will be unsatisfactory.
Try talking to a few transmission rebuilders if you cant do the calcs yourself. You can download Feroza manuals from warfs.org which will give you the Feroza specs.
Randomly fitting mechanical components without a significant amount of understanding of how they all interact is VERY unlikely to work out.
Still you seem to have lots of energy and if you couple that with a sound design you could end up with a great toy.
( usual disclaimers )
It seemed like a much better idea when I started it than it does now.
It seemed like a much better idea when I started it than it does now.
Yeah.. the ratio is high, but the number is too lowr0ck_m0nkey wrote:Way to high you meanHotFourOk wrote:They will most probably be 3.36363636
Waaaaay to low for a standard Roza tcase.
I was trying not to confuse him more! And I was conforming to MM's precedence of 'lower' as in the first reply.
[quote="RockyF70 - Coming out of the closet"]i'd be rushing out and buying an IFS rocky[/quote]
Yep the old two card shuffle...
A high numerical diff ratio gives a low speed.
Thats' one of the reasons I like Toyota centres, firstly because them make a 5.285:1 to match the Feroza and also because there are higher ratio's still available 5.71:1 which will be great for 33's
A high numerical diff ratio gives a low speed.
Thats' one of the reasons I like Toyota centres, firstly because them make a 5.285:1 to match the Feroza and also because there are higher ratio's still available 5.71:1 which will be great for 33's
( usual disclaimers )
It seemed like a much better idea when I started it than it does now.
It seemed like a much better idea when I started it than it does now.
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