Thinking that my be a nissan job.

 

Sheik will chime in
Keen to put a lift in ours after crissy so would be interesting on what set up you use.

 

I have brought 2" king springs for it and a lot of the tracks I drive the car bellys out so I want to raise it up 2" but I haven't seen anyone do it on HBMC model yet

 

I assume your getting just front springs to counter the drop from having a bar? My 200 certainly dropped a solid 1.5" with an arb unit and definitely affecting steering and the rear end bounced around more because of the weight distribution being thrown out. I'll definitely put down front springs in my ti-l, if possible, to balance out the ride height.

As far as bleeding the system, if it's anything like the 200 KDSS, it's simply a matter of putting the car up completely on a set of jacks, undoing a screw in the side of the shock and allowing the pressure to equilibrialise and then nip back up.

 

If you pm me your email address I will send that section of the manual.

Basically without the genuine Nissan tool you are screwed. You can't do anything. The bleed port on the PPMU is similar to the HP fitting on the AC system.

In order to level the vehicle and re equalise the accumulators you need the genuine Nissan gauge, or you need to go to Pirtek and get something made up.

I decided not to lower mine (yet) and I haven't pursued the fitting any further.

 

So, not to chime in ignorantly, but is it possible to put 2" lifted coils on the HBMC suspension and keep the original shocks?
Provided you get Nissan to reset the pressures etc.
I know a lot of guys on here are frustrated about not being able to lift a Ti/Ti-L.

 

It is now being done by Andrew Casser in Melbourne - apparently a really good setup.

 

Cool.
I would still love a Y62 but as the family wagon the missus demands a bit of luxury so an ST-L would never cut it.
Nice to know that if we ever get a Ti then we can still get a lift.
Especially now with the Gen 2's not having an ST-L option anymore.

 

What?, did I miss that all the series 2 models have the hmbc only?!

 

Yep, all hydraulic now.

Of course, that may encourage the after-market to put greater emphasis on coming up with compatible lift kits.

 

I was always under the impression the springs could be swapped out to counter the weight and sag of the bullbar?

 

Not with HBMC. STL only.

 

Found this online....
http://www.infiniti-club.org/manual/2011_QX/SCS.pdf
Its not for a QX80, but you can see the similarities in the HBMC suspension.
I am no mechanic but you would think these principles could be applied to the Y62 HBMC suspensions set up, and if so, you should be able to remove the front strut to replace the coil spring.
Then your big issue would just be making sure the factory HBMC shocks could deal with the 50mm lifted coils.

 

Did a quick search of the pump part number and guessing this is what Sheik did too as over $7000

Makes one wonder how somebody can dream up such a price for a hydraulic pump, gauge, tank and fittings

 

at this point i not keen on a lift, but i not keen on sagging either if i fit a bar/winch. with only the 1 option so far (changing the lower mount) i am re-assessing the need for a bar all together. the rears- i can see the rear springs getting upgraded to some that can handle a load and a van in tow. oh- i have a S.2 so it has hbmc.

 

Has anyone ever been given a proper technical explanation as to why the springs cant be swapped out?
I admit I am no mechanic but assuming the rear springs could be easily swapped out without touching the HBMC shock, and you could replace the front coil provided the system was re-pressurized/commissioned by a Nissan Dealer to make sure it was OK.
From my basic understanding, as the suspension is all independent, the travel of the wheels is governed by the members holding them in place, and as such, the shocks should have sufficient length for the wheel travel.
I would have thought the springs would simply be stiffer so as to sag less under the weight of the vehicle.
Even if the springs were physically higher, they could not be any higher than the limitations of the suspension assembly.
Thoughts and comments welcome.

 

The front HBMC coil over cant be disassembled. The top hat is captive maybe due to the hydraulics above it?

If someone built it then someone should be able to tear it down?

 

Anything is possible. All you need is the will to do it, the expertise to undertake the job, and the right tools.

I honestly think what we are seeing with the HBMC patrols is a combination of those three things.

I imagine that in the coming year or so, someone out there in the 4wd modification business will get sufficiently motivated to buy the Nissan bleeding pump. Then, opportunities will arise. At the moment though, who is willing to experiment? Disassembling the system means being unable to just fit all the parts back together and drive it again. There has to be a market in order for someone to make an investment. Maybe now that all Aus spec y62's are HBMC the situation will change.

 

No need to buy genuine, the fitting in the PPMU is a standard hydraulic fitting, the same as an air con fitting. I recon the pirtek bloke at work would be able to make something up pretty quick. All you need is an enerpac style pump and reservoir with a couple of needle valves and a basic low pressure gauge.

 

STL coil over

 

HBMC Coil over. There must be a way to get it apart?

 

There WILL be a way to get it apart, and non-destructively (which is imperative).

And there probably IS a way to make up a non-genuine pump/connections.

The problem is, who is going to volunteer their vehicle for the experiment? The is what's holding this up. You have to have someone who is willing to potentially have their vehicle unusable for conceivably a long period of time, if the aftermarket pump system doesn't work.

 

Looks like you should be able to simply lift the strut cap thing off the top of the spring and slide the spring straight off.
To me the biggest thing putting people off is draining and recharging the HBMC system itself.
I think we need to read between the lines a bit. It says the "shock absorber" cannot be disassembled. Not the whole assembly.
I appreciate that if the internal valving in the shock itself went that you could not take it apart to rebuild it but you would think having to replace the spring along with the shock in the event of a fault would be a bit extreme.
Interesting point though about who would volunteer their car to have it done.
I wonder what chance you would ever have of getting a Nissan Dealer to fit aftermarket springs for you.

 

Naw, you are wrong there. I have had a look at the top of the shock - the alloy extension piece- and there isn't a way to undo it that I can see. Not like the stl coil over where there is a nut to undo. It may all press fit together in the factory and there isn't any way to get it apart that doesn't destroy it.

The manual clearly says you can't remove the spring, if he Spring is sagged or damaged the whole coil over must be replaced.

 

Based on the Infiniti parts prices I have seen ex-USA, the coilover assembly for HBMC vehicles isn't expensive anyway.

 

Maybe should order one and see what disassembly takes...

Found this air intake while looking around on US ebay....

Afe Cold Intake Pro 5R for 11 15 Nissan Patrol Infiniti QX56 QX80 5 6L 54 76103 | eBay

 

I am not a mechanic but has anybody considered a 2" leveling kit to fit on top of the strut to take up sag of the bull bars and get it off the bump stops.
If the bull bar sags it by say 1" we are only talking an extra inch of CV angle
2” Lift Leveling Kit 2WD 4WD Pro for 2004 2015 Infiniti QX56 | eBay
They also do 1" leveling kits
1” inch Front Lift Leveling Kit 2WD 4WD 4x4 for 04 15 Infiniti QX56 | eBay

 

If you could pick up a pair of these and laser cut them in half horizontally to make 2 interlocking Cs that would work. You could drop the coil over and fit the two Cs around the shock top. I probably am not describing this well....

 

To fit those you would have to remove the hydraulic lines which means you need the pump to repressurise the accumulators. That's why most aftermarket people are looking at the bottom of the shock not the top.

 

A dude on facey grabbed one of those airboxes sheik, said it picked up another 25ish whp and torque over the entire rev range. He did have a uni chip as well though so maybe that was tweaked with to get the most out of the box.
It's on my list of things to buy.

Edit, old mate said it picked up good gains without any tuning.

 

A dude on facey grabbed one of those airboxes sheik, said it picked up another 25ish whp and torque over the entire rev range. He did have a uni chip as well though so maybe that was tweaked with to get the most out of the box.
It's on my list of things to buy.

Go for it if it makes you happy, but it won't make any difference. The pressure drop thru the stock box is negligible.

By definition an air box can't add power across the rev range. It can only add power at the top end, when the flow is highest, and only if the stock box is a restriction.

As I said using the diagnostic tool I have I can see the inlet manifold pressure and at redline its only a couple of Kpa below atmospheric. 2 Kpa is less than 2% reduction in pressure. So they most you could expect to gain is 2%. And only right up at redline. The guy on Facebook is full of it. Mathematically what he is saying is impossible.