FZJ71 1000WHP low range ratio (1 Viewer)

[Abosaud]

Hi everybody,
My car is FZJ71 with turboed 1fz-fe motor producing 1000 wheel horse power driven by h151 & hf1a. I'm facing issue with the low range ratio which is 2.488:1 and it isn't suitable for 1000whp so I couldn't find any higher ratio for hf1a TC. I'm thinking about 19 spline spilt case TC out from fj60 do you think I can hook it up to h151 tranny to get that 1.959:1 ratio? Do you guys suggest another solution to get the ratio around 2:1 for low range.

Thanks in advance

 

[FJBen]

First off, welcome.


Secondly, pictures please, would love to hear about that build to get to 1000whp.

I don’t believe that the split case will connect to the h151, from memory the bolt patterns are way different. I suppose you could make some adapters, but not sure how well they would hold up under that power.

do you have 4.11s in the axles?

 

[JuanJ]

Hello,

What about replacing the transfer case gears with, say, 2:1?

60 Series transfer cases have lower gearing but they were designed for lower power engines. 1000 HP may be a bit too much for them.

If you have 4.11:1 differential gears, replacing them with 3.7:1 ones may be an option as well.

Last but not least, pictures or it did not happen.





Juan

 

[JOCKERMACHINE]

What kind of tires you use?
What type offroad you gona do?

Here i see a few splitcases broken with ls engines swap....
The idler gear washers don't hold the load in long sand hill climb. (Around a minute at WOT) finally the idler gear comes ouf of the case... nice carnage

Greetings

 

[Abosaud]

First off, welcome.


Secondly, pictures please, would love to hear about that build to get to 1000whp.

I don’t believe that the split case will connect to the h151, from memory the bolt patterns are way different. I suppose you could make some adapters, but not sure how well they would hold up under that power.

do you have 4.11s in the axles? yes it is.

 

[Abosaud]

Hello,

What about replacing the transfer case gears with, say, 2:1? not available

60 Series transfer cases have lower gearing but they were designed for lower power engines. 1000 HP may be a bit too much for them.

If you have 4.11:1 differential gears, replacing them with 3.7:1 ones may be an option as well. still not the proper ratio even for 3.58

Last but not least, pictures or it did not happen.





Juan

 

[Abosaud]

What kind of tires you use? sand tires 32''
What type offroad you gona do? sand hill climbing

Here i see a few splitcases broken with ls engines swap....
The idler gear washers don't hold the load in long sand hill climb. (Around a minute at WOT) finally the idler gear comes ouf of the case... nice carnage

Greetings

 

[Abosaud]

I like the split case for 2 reasons:
1 I don't have to change the raer diff style.
2 the twin stick TC shifter.

 

[FJBen]

I like the split case for 2 reasons:
1 I don't have to change the raer diff style.
2 the twin stick TC shifter.

Nice pictures! That thing is sweet.

Again, as far as I know, no one has mated a split case to an H151.

You could machine a new case I suppose to match the bolt pattern???

You could run a divorced t-case setup and run an Atlas transfer case, the have 2.0 gear sets, but I'm not sure you have the drivetrain room to do that.

 

[JOCKERMACHINE]

And what is the reduction of the h2fa?

That happens with the split case under to much load