Can I use Castrol Synthetic Grease to re-lube by Hyperboost HX DV? Also, can it be shimmied and how?
03-16-2006, 05:59 AM
#2
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yes...and not sure...why would you shim? The only reason>>
folks shimmed in the past was to get more resistence off the spring that is in the DV...truly the TT likes a lower resistence IMO. I have used the green spring on my DVr since new...and she will hold 23psi in 5th gear for a LONG time...longer than i have room to test on the top end...
I say lube it and forget the shim..IMO
I say lube it and forget the shim..IMO
03-16-2006, 06:51 AM
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take the dv apart>>>
and clean and lightly lube the piston inside. Clean with a towel that is lint free or a shop rag that leaves minimal residue....just keeps things neater.
Reassemble....done....if you do this everytime you change your oil..you should be fine.
Reassemble....done....if you do this everytime you change your oil..you should be fine.
03-16-2006, 06:51 AM
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You CAN do it while its in the car - but easier if you remove it....
if you leave it the car - just disconnect the vacuum hose on the top. Unscrew the top portion of the valve. Remove the piston. Wipe the piston and the inside body of the valve clean. Relube o-rings and piston with synthetic grease - don't overdo it - I use Mobil 1 - the red stuff. Then reinsert the piston and reassemble. I do it every time I change my oil - 5k.
03-16-2006, 08:21 AM
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How long is long :) ? How far down the RPM range can you hold it?
...and with what outside temps? In the winter I spike at around 21, then drop to about 17-18 and bleed off to 15 past 5K RPM. In the summer...spike at 23 and hold there til about 4500rpm...then slowly bleed down to 17 towards the red line.
03-16-2006, 08:36 AM
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It will hold forever, at any pressure...
The pressure in the upper chamber comes from the intake manifold, via the small hose, so is equal to the pressure in the post-turbo intake tract (except, perhaps, under quickly changing boost levels, where the small hose might not keep up). The spring only has to overcome the physical resistance of the valve, not boost pressure.
When the throttle closes, the intake vacuum flows through the small hose and opens the valve (which still is under pressure from the _pre-throttle_) intake tract.
Changing springs makes a difference in the balance between opening vs. closing the valve, but has nothing to do with "holding boost."
When the throttle closes, the intake vacuum flows through the small hose and opens the valve (which still is under pressure from the _pre-throttle_) intake tract.
Changing springs makes a difference in the balance between opening vs. closing the valve, but has nothing to do with "holding boost."
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03-16-2006, 08:46 AM
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in 5th gear, i have held 23psi close to 5000rpms....but at that speed>>>
you are rolling....have not been able to consistently see that for obvious reasons....
She will bleed off a bit in 3rd...but nothing below 19-20psi..
I make a 1/4 turn on the boost machine for season changes...;-)
She will bleed off a bit in 3rd...but nothing below 19-20psi..
I make a 1/4 turn on the boost machine for season changes...;-)
03-16-2006, 09:38 AM
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Softer spring...
will let the DV open faster, recirculating boost under closed throttle.
People go with stronger springs (shims) to make the on-throttle response (closing the DV) faster.
People go with stronger springs (shims) to make the on-throttle response (closing the DV) faster.