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Location:
Melbourne
Registered:
May 2002
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How to define a W55 and a W58?
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Mon, 23 September 2002 12:08
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Friend of mine just did a conversion:
a 3SGE genII with a W58 on a Sprinter and a 4.3 rear diff
however, the result is not that impressive....
we feel that the gear ratio doesn't match up nicely
for example:
1st gear 7000rpm
then change to 2nd gear..
it will drop to 4800rpm-5000rpm mark....
can't keep the engine in the power range.....
so...how to define a W55 and W58 externally?
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Location:
c'town, NSW
Registered:
May 2002
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Location:
Melbourne
Registered:
May 2002
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Re: How to define a W55 and a W58?
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Mon, 23 September 2002 12:36
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thanks for that...
is the bell housing the same or different?
and..anyone know the formula to caculate the speed relative to engine speed and gear ratio?
I am not sure how to explain
it's like If I am doing 100km/h with a engine speed of 3000rpm and the fifth gear ratio is 0.783...what's the ratio on the rear diff? 4.3? 4.1? etc..
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: How to define a W55 and a W58?
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Mon, 23 September 2002 12:43
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Bellhousing will be identical.
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Registered:
May 2002
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Re: How to define a W55 and a W58?
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Mon, 23 September 2002 12:48
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you have to work out the rolling diameter of your tires first. Then, take 3000 RPM and work out how many RPM the wheels are doing using the gear ratio's then work out how far the car is travelling in a minute (wheel RMP * wheel diameter)
It's just all maths...I hate maths so I'll leave it to you to work out!
Tim.
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Toymods Board Member
I supported Toymods
Location:
Turramurra, Sydney.
Registered:
May 2002
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Re: How to define a W55 and a W58?
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Mon, 23 September 2002 12:59
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Figure out the distance the car travels with 1 complete rotation of the back wheels (same as the circumference of the tyre). This is the distance of the wheels revolution.
Take the rpm at a given speed, say 4000rpm at 60km/h, with the gearbox in 4th (again, to make things easier). The engine is doing 4000 revolutions per minute, and transmitted through a typical 4th 1:1 ratio, the driveshaft is doing the same rpm. Transmitted through the diff, which is a reduction gear, lets give it a ration of 4:1, when the driveshaft does 4000 revolutions, the axles will spin only 1000 times.
That means your wheels are spinning at 1000rpm. Get the distance your car travels on 1 wheel revolution, lets say 1m, times it by 1000 to get your km/minute, then by 60 to get your km/h.
The example car would do 60km/h at 4000rpm in 4th gear, which matches the given speed at the start...
That's just off the top of my head, there may be a quicker way.
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: How to define a W55 and a W58?
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Mon, 23 September 2002 23:14
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There are plenty of gear/speed/engine rpm calculators on the net. Do a search.
Albins off road can supply you with close ratio gears for your W5* box for around 1500.
http://www.albinsgear.com.au/
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: How to define a W55 and a W58?
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Tue, 24 September 2002 09:31
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what's the strength of those close ratio gears like?
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Location:
Perth
Registered:
August 2002
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Re: How to define a W55 and a W58?
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Tue, 24 September 2002 20:49
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Other people have already popsted ID methods but a w58 could be harder to find than you think. I spent a while looking and settled for a 55. apparently only 5% of w boxes are 58s.
perhaps you could consider the 4.7+ ring gear off a toyota VAN like they recommend on club4ag?
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Location:
Melbourne
Registered:
May 2002
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Re: How to define a W55 and a W58?
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Wed, 25 September 2002 23:12
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thanks heaps for your suggestion guys...
I think I will get a W55 boxes...
anyone want to swap for my W58??
actually....which one is stronger?
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: How to define a W55 and a W58?
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Thu, 26 September 2002 00:56
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The W58 is stronger...
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Location:
perth w.a
Registered:
June 2002
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Re: How to define a W55 and a W58?
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Thu, 26 September 2002 14:47
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for whats its worth i had a w58 close ratio box behind a 450+hp chevy - it was beautifully smooth shifting at w.o.t until i tried traction goo at the drags.
the cost for the close ratio 1st and 2nd set was $950 plus - that was 9 years ago and its still busted in the shed.
and im still looking for another $450 close ratio box!
the trick to the w58 was to get new syncros made to handle the power shifts and NEVER USE TRACTION GOO at the drags.
to this day the w58 is the best allround 5 spd i've used, and that includes new bmw and mercs! - go the toyo!!
just my 2c worth
avagoodone
dave
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Location:
Aucks NZ
Registered:
June 2002
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Re: How to define a W55 and a W58?
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Fri, 27 September 2002 07:08
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if the box is out of the car you could spin the input shaft and count the amount of rotations the output shaft turns in each gear. do say 10 turns to get it more accurate. (remember to divide the result by 10 once counted)
check a gearbox ratio chart to compare the ratio's of w55 and w58.
see here for one
http://www.geocities.com/MotorCity/Pit/9975/dataBy Subject/Gearboxes.html
if gearbox is in car. just a thought. if your speedo and tacho are correct. then you could drive at 100km/h in fourth gear (1:1 gearbox ratio) and the tacho will say what your diff ratio is. like 4100 rpm would be 4.1:1. sounds correct theoretically doesnt it?
or if you know the diff ratio already
using math calculations like said above. u could use the tacho and speedo and the diff ratio (thats if their all calibrated correctly) to find out what the gearbox ratios are. bit complicated if ur no good at maths me thinks. or turn the crank over by hand (plugs removed makes it easier) and count the rotations of the driveshaft in each gear (with the diff jacked up of course).
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