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Re: 2G power steering set up on your GVR4


JSchleim18
Minor 69er
1157/2000


Galant VR-4 org Post #: 853643 posted 11/30/09 02:07 PM     Remind Me!  Send Private Message   Edit Post      
How to: click



-Jeremy
A88 Summit White - CD (No Sunroof)

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Dialcaliper
Flagration Member
1269/2000


Galant VR-4 org Post #: 854064 posted 12/01/09 09:25 PM     Remind Me!  Send Private Message   Edit Post      
The 2G pump is basically identical internally to the older version. The flow control valve is actually a 3-stage setup. It has two ranges where it decreases flow (sharply between 700-1000 to compensate for weak pump flow at low RPM and at a slower rate at 1000-3000). And the final stage above 3000 RPM where the assist is limited to a fixed size flow channel. You don't want to completely remove the spring - You'll end up with way too much power assist at freeway speeds (resulting in mushy steering feel). The result is a pretty linear pressure vs flow slope up to about 5500 RPM. The problem is that above that, flow drops off rapidly when the relief valve opens to prevent the pump from exploding.

The best result will probably be had by shimming the plunger to somewhere in the middle to end of the 1000-3000 range if you still want to retain some steering feel.

More info Here, page 19-11 if you're interested.



1269/2000 Summit White

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belize1334
well bread and nobly conceived
1334/2000


Galant VR-4 org Post #: 860205 posted 12/23/09 06:21 PM     Remind Me!  Send Private Message   Edit Post      
This guy on Autocross.dsm.org seems to think that only 1G's had this issue. So, if the pumps are basically identical, then maybe there's something else that's different. Could it be that the 2G uses a bigger pully on the pump (or smaller pulley on the crank) so that it's not spinning so fast at 7k rpms? Even if that isn't the default case, maybe somebody could build/install an oversized pump pulley so that the pump is only spinning 80% as fast as in OE configuration. That'd make the cutout not happen until nearly 9k rpm which is higher than most autocross engine go.



Roger B. Scott
'91 Belize Green

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GreenGSX
One Member


Galant VR-4 org Post #: 860318 posted 12/24/09 08:14 AM     Remind Me!  Send Private Message   Edit Post      
All you have to do is get your hands on a 1G NT power steering pump (mistu engine). I've had one on both my 1G track car and the One Lap VR4 and I don't have a hint of power steering cut-out even when autocrossing. Its a really old-school autocross mod I picked up from Mike at DSS.



click

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crankwalk
Unregistered


Galant VR-4 org Post #: 860364 posted 12/24/09 10:23 AM     Remind Me!  Send Private Message   Edit Post      
^Yeah it has been on the vfaq for 11 years or so.

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JSchleim18
Minor 69er
1157/2000


Galant VR-4 org Post #: 872360 posted 02/08/10 03:19 PM     Remind Me!  Send Private Message   Edit Post   
Quoting GreenGSX:

All you have to do is get your hands on a 1G NT power steering pump (mistu engine). I've had one on both my 1G track car and the One Lap VR4 and I don't have a hint of power steering cut-out even when autocrossing. Its a really old-school autocross mod I picked up from Mike at DSS.




When you say a NT power steering pump, do you mean 2.0 or 1.8 or it doesn't matter?

VFAQ lists that the cutout is on both Turbo and Non-turbo 2.0 but says nothing about the 1.8?



-Jeremy
A88 Summit White - CD (No Sunroof)

Posts: 4738 | From: Long Island, NY | Member Since: 10/16/06 | IP: (24.190.8.169) | Report this post to a Moderator


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