Isuzu MSA Gearbox to LT230

Now a problem may occur in such an event where at the desired ground speed there isn't enough available force (torque) applied to ground to get you up that say sand dune. ie. operating in the shaded area in this chart.

http://i1195.photobucket.com/albums/...b1/Operate.jpg

ie. if you are in 2nd gear = you can't go fast enough, and in 3rd gear you haven't enough force.

A few ways to fix this are;

1. Add another gear (6 speed) that fills this postion
2. Regear your transfer case/diffs/tyres to either put 2nd or 3rd gear in this operational area
3. Get a better run up so you need less torque
4. Fit better tyres/adjust air pressure for better traction so you need less speed
5. Up the power from your engine - turbo/intercool it
6. Do a combination of all above.

Each will have an advantage and disadvantage ie. adding a turbo will give extra force at all speeds while an extra gear will only improve specific speeds and option 4 and 5 may be cheap solutions that are all that is needed.

So 6 speed MYY-6S would fill LT85's 2nd-3rd speed gap;

http://i1195.photobucket.com/albums/...ubb1/MYY6S.jpg

So would regearing to LT230 with 1.22 and 35 in tyres;

http://i1195.photobucket.com/albums/...1/Tyres_TC.jpg

As would an increase of 20% torque from adding a turbo

http://i1195.photobucket.com/albums/...b1/Extra20.jpg

You will notice that the combinations can also modify most notably theoretical top speed and low down gearing.

Basically many ways to skin the cat, all I am trying to say is that a good spread between 1st and top gears to provide low down slow gearing for crawling and a top speed for cruising are the main requirement for the consideration for including in cost effectiveness, when balanced against where the extra money could be placed to improve the vehicle in other ways.


Don't get me wrong, if a 6 speed slotted in as easy as a 5 with the same wide ratio between 1st and 5th of the 5 speed then I would be all go :)

Quote:

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Originally Posted by steveG

For me, it would definitely be keep the existing length, for the following reasons (in a 110):
- 160mm further back would give clearance issues between turbo and heater. (Standard engine position with angled truck turbo manifold is in a good position).
- repositioning engine mounts is welding and technically requires engineering approval. The average punter that can change a g'box may not be up to welding mounts, so would need to get someone to do it (cost/hassle).
- requirement for different radiator hoses, and/or mods to radiator mounting, fan shroud etc.
- Don't see any big drama with access to the PS box in standard position. 3-bolt box was a bit tighter but still OK. 4-bolt is fine.
- Requirement to relocate the air filter isn't a show stopper, but an extra task and not sure I want to look like Roothy :wasntme:
- I cant see a need for a six speed. With a turbo - 4 is VERY driveable, 5 would be nice to drop a few revs for cruising.

And I agree with all of Isuzurover's points.

Steve

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Having still number 1 box in the shed awaiting fitment the KISS principle has to apply the less and easier the task is in fitting the more likely it going to be an option for more people. I am now reducing my projects and until the LT85 dies in the 120" I will not fit it till it breaks. I enjoy my cars more than working on under and in them, Sheldon walk about/drive about Oz sounds a good attitude to life. I think Steve sums it up well and as many of us know when modifing vehicles little things take just as much time somtimes more to get right . The more complex the changes the more expotential the effort and cost required when modifing.
I am sure there are uses for 10 speeds but how often, how muc hand how many would utilise a 10 speed option. While I appreciate Sheldons commitment a LOT of time has and continues to go into this set up at the end of day his effort needs to be rewarded. My 2c.

Garry

Nice work Sheldon... Time to leave Matlab behind and move to Python though ;)

Quote:

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Originally Posted by the_grubb

You will notice that the combinations can also modify most notably theoretical top speed and low down gearing.

Basically many ways to skin the cat, all I am trying to say is that a good spread between 1st and top gears to provide low down slow gearing for crawling and a top speed for cruising are the main requirement for the consideration for including in cost effectiveness, when balanced against where the extra money could be placed to improve the vehicle in other ways.


Don't get me wrong, if a 6 speed slotted in as easy as a 5 with the same wide ratio between 1st and 5th of the 5 speed then I would be all go :)

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Yeah wish it was easy :(

Any updates???

Hi Sheldon,

Are you still making your MSA Gearbox to LT230 adapters? If so do you have any?