Editing HICAS - Removal (section)

=Other Experiences=

==Wheezy==

===Removal of Subframe===
From my experience with the rear end of the HR31 you can remove the subframe leaving the diff, wishbones, suspension, brakes etc still attached.

You will need to remove the four diff bolts that hold the subframe to the diff, the four (two on each wishbone) bolts for the wishbones, and the nuts that hold the subframe mounts.

The subframe will then come out easy enough.

===RB30E PS pump===
Please note several things, in hindsight if I was not a broke uni student at the time I would have done the same as R31 Nismoid and modified the stock pump.

However the RB30E / R33 on pump (I will refer to these pumps as RB30 et al from now on) clears up some room.

Firstly I feel it is best to swap the PS reservoir and filler hose to the RB30 et al pump if you go this route, this clears up the extra return line in the reservoir and the difference in hose ID (inner diameter).

You will need to space out the top bolt hole of the pump as the twin cam timing case hits the bracket for the pump. Just use a longer high tensile bolt. Pretty easy to match up the correct thread bolt from anywhere that sells grade 8 or higher HT bolts. (Its metric of course).

A downside is that the pump pulley does not interchange back to the 4rib pulley as one has a keyway and the other teeth (IIRC).

This means that you will be using a 3pk belt as found on the RB30. (IIRC most listings on RB30E ps belts are wrong one listing is too long and the other is a 4PK belt)
The belt will also now not be square with the harmonic balancer. This is not a huge issue, it is a fraction out, however make sure the belt is nice and tight, I have thrown a belt twice because it was an inch or so too long and I ran out of adjustment.
This occurred on shifts where the tension was off the belt when changing gears, IE giving a snapping action to the belt and throwing it.

I believe I have only seen this occur once more on SEVNTH's coupe racing @ Phillip Island (he was going pretty hard on the track however).

I would like to get my hands on some time and a RB25 harmonic balancer (due to it having a 3pk PS belt) and seeing if it would be suited to an RB20 (revs and belt widths / circumferences)


===Z31 Bush Modification===
I found that because the factory bushes were floating that the new solid bushes helped reduce enough movement (up and down along with lateral) of the subframe that squat was ever so slightly less significant.

Also due to the nature of the bush I fitted a steel plate under the bottom bush to allow the bush to crush firmly against the subframe and the mount underneath the subframe mount. (along with the 8mm or so machining as described by Dave).


==Blue==

Another thing that can be done in the stock twin chamber pump is to take the back off it and remove all the vanes from the HICAS section. That way it is not sitting there in bypass all the time.  The front and rear sections of the pump are isolated from each other so disabling the HICAS end should not change the main pump.  I also welded up the screw in fitting that the banjo bolt screws into.


'''Contributors''' - Dave31 GTSR, Wheezy, blue

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