"PROJECT ROOBY" 80 all rounder build

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Great work with the suspension so far Darren and getting those 37's rolling without a sky-high lift! The part i'm hanging out for now (and i'm sure a heap of guys on here are) is when you blow that 1FZ!! :D
Nothin like a bit of forced-induction...
 
Great work with the suspension so far Darren and getting those 37's rolling without a sky-high lift! The part i'm hanging out for now (and i'm sure a heap of guys on here are) is when you blow that 1FZ!! :D
Nothin like a bit of forced-induction...

We ordered the de compression plate and computer, and dash adjuster/display as well today, so its coming soon :steer:
 
Give us an RTI, and we shall see how it compares, but it doesnt look close to grahams at this stage, bearing in mind Grahams is parked there in 2wd, without the locker in to take those pics..

You give us an RTI first. Course, I never realized that 2wd and lockers changed full compression and extension on a shock. That's some funky physics to be sure. Full extension and compression on a 14" travel shock is full extension and compression, doesn't matter if it's on a RTI ramp, a fork lift, or on a trail. It also doesn't matter how close you think it looks, full compression and full extension is 14" reguardless of how you squint your eyes - and it's of course going to look different - being completely different bodies and all.

And they are actually 16" shocks..

ha! nice how they changed from 14 to 16 after the advantage is challenged.
14 inches.JPG
 
You give us an RTI first. Course, I never realized that 2wd and lockers changed full compression and extension on a shock. That's some funky physics to be sure. Full extension and compression on a 14" travel shock is full extension and compression, doesn't matter if it's on a RTI ramp, a fork lift, or on a trail. It also doesn't matter how close you think it looks, full compression and full extension is 14" reguardless of how you squint your eyes - and it's of course going to look different - being completely different bodies and all.

The advantage of the uniball is rigidity and drastic reduction of stress on the mount, not flex vs. a rubber bushing. Durability of either depends on usage.

Extension and compression of the shock is a dick swingers competition. How the suspension works is what matters, and 80's need big tires a lot more than they need 14" of rear travel given the front can't manage half that without modification, and if you free up the front to match you're going to get a slinky.

2wd and locked does affect how you get up an RTI ramp, in 2wd a tire will spin before you lift it. Still not sure we really care whose is bigger :flipoff2:

Having said this, the 80's rear arm bushings can take a ton of flex and don't fall apart - it is a great design. I went back and forth on buying Slee arms with factory rubber vs. MAF 4+ with uniball, and I went Slee. Of course, my setup never has more than 5" of shock travel in any direction, so I'm not putting much stress on them, either.

The Rooby project is after 12" of travel, 8" down. I'd probably go uniball, too, given part of the usage is offroad speed oriented, if I was designing for the same outputs. Getting rubber out of the system becomes a greater priority as certain usage biases increase (long travel with frequent hardcore use being one of them in most applications).
 
Extension and compression of the shock is a dick swingers competition. How the suspension works is what matters, and 80's need big tires a lot more than they need 14" of rear travel given the front can't manage half that without modification, and if you free up the front to match you're going to get a slinky.
Real simple Nay - the statment was made

This is the sort of travel the swivel arms and a frame give an 80 with the sway bars disconnected.

And the counter statment is 'you can get that sort of travel with the stock set-up', which is 100% true. Extension and compression of a shock is only a way of measureing the sort of travel (amount of travel) you have, it's not about a swinging competition. If you go off pictures, you can argue angle, or tire size, if you go RTI ramp, you can argue tire composition, sidewall flex, air pressure, how you drive up the ramp, and on and on. If you measure shock extension on one side, and shock compression on the other side, that takes all the pissing contest out of it as that really tells you where the axle is relative to the frame.

Yes, it is only a measure of ultimate stuff and ultimate droop, and does nothing to speak of balance or quality of suspension travel. But that balance and quality isn't what was presented, what was presented was ultimate travel, and that is what was countered.

As far as the 80 not needing 14" of travel in the rear w/o freeing up the front, I can only speak from personal experience in that my 80 handles trails much better with 14" than it did with 10" and I haven't freed up the front.

Actually, the more interesting part of this build is how he frees up the front to make use of the longer travel front shocks, as making use of the longer rear shocks doesn't require any work. And we haven't seen anything on that yet, except the possible use of an X-link. Even in the rear, the more interesting thing in that frame work isn't the amount of travel that can be obtained with it, is the elimination of the panhard bar.
 
thanks for the exhaust route pics darren, a friend also did this and I like it a lot. I am going to go this way as well. i can print your photos as reference for the shop
 
The bad thing about going 14" travel in the rear without freeing the front is some unwanted movement.

ESPECIALLY when going down an off-camber spot. Going up it flexes sweet and you have no issues. When you start going on a trail or big obstacle, the front dictates where it goes and the whole body follows it. :eek:

this is where a 3 link would really help up front. Get the right springs/shocks/rates and balance and now it works well.
 
I prefer a parallel four link front. This is what the truck with the y rear link has in front.. If you bust one link and there is still 3 left with one on the other side of the axle. On a 3 link if the single upper link pops.. look out.
 
Oh the exhuast is some of the best I have seen...

One thing I would do different for a number of reasons is a side exit just before the rear wheel well.

Super simple to do.. More room for a subtank, custom suspension stuff I want to do later ( torsion bar remote swaybar, cantilever/rocker arm prerunner style suspension) or things like sub tanks.

I can also make a simple quick attatching exhaust snorkel much like that seen on real AMG hummers with fording kits but not as elaborate.
 
Oh the exhuast is some of the best I have seen...

One thing I would do different for a number of reasons is a side exit just before the rear wheel well.

Side exits are no good for us here, deep fast running water will stall the engine, and the water will run up the exhaust and fill the engine.

We also do hours and hours of driving [1000 miles a day +] sometimes to get where we are going for outback travel etc, so a side exit would just drive you mad on the road with the noise.
 
Was thinking more on the lines of this with a removable stack..

2001011630658657202_rs.jpg





I guess a side exit with a a QD snorkle off would be louder...

Rear doors on an 80 are much closer to the wheel well. Tight if possible at all.

Also one could make rear exit and put a QD hanger for the stack off a rear spare rack or ladder.
 
Was thinking more on the lines of this with a removable stack..

I guess a side exit with a a QD snorkle off would be louder...

Rear doors on an 80 are much closer to the wheel well. Tight if possible at all.

Also one could make rear exit and put a QD hanger for the stack off a rear spare rack or ladder.

Wouls be overkill for us, as the design on the truck covers what we need, though we are adding a resonator tomorrow, to the tail pipe, stop a little droning.
 
seen and driven a few US hummers like that too.

Look around a motor pool and you will see a good bit of that.

Yet to notice any difference. Outer lugs are angled the other way so that might be it..

The MT are not the only style you see either wrangler RTII are the other but bias ply.

Any how... DETAILS on the front for link please!
 
offtopic,

but dont mils pec hummers run random reverse pattern, so the tracks left cant tell very easily which direction the vehicle was heading ?

Exactly Right! :cheers:

(Still anyone who knows how vehicles steer and such can tell the difference especially with just one set of tracks to follow. I've also seen all four tires reversed but rarely all four are forward.) Anyways, that's the theory alright and I should also say it works best with 4 wheel steering as opposed to the typical setup. :cheers:
 
still off topic, but wouldn't just the rear two tires make the difference since they leave the last track?
 

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