tar6day

Does the car need to be elevated, no suspension compression, b/4 filling remote reservoirs w/ nitrogen?

JPhillips-998

Nope, on the ground is fine.

Alan Herod

Any updates on the utility of the new equipment people have purchased?

Larry Herman

I use the Penske tool to set my shock pressures, and the one I built to check them. It does lose a little pressure whenever I check them, so I only use it as a precursor to setting them. On the Moton shocks, the canister pressure directly affects the compression, and so if you raise them, you must back off on the high speed compression setting. Again, the stiffer your springs, the less affect canister pressure has.

jaydubya

The ProTank setup has worked great this season. No problems.

RickBetterley

Hi Larry
We were having conversations about an integrated shock fill and gauge setup; I hate the fill it and bleed it down method, finding it difficult to get the final pressure right.
Longacre has just come out with a combination digital gauge and fill/bleed valve (part #50473); what do you think of this set up for an accurate pressure gauge and fill device?
http://www.longacreracing.com/catalo...=1036&catid=19

Larry Herman

Looks nice Rick. The hose makes it quite convenient. I may think about that myself, as the Penske unit that I have is one piece, and hard to maneuvour when filling my rear shocks.

RickBetterley

Thanks, Larry - I am having the same thought.

jrgordonsenior

How would you fill the Longacre gauge? Do you somehow put a valve stem fitting in the bottom and fill with a tire pressure chuck or filler?

Brian P

My understanding is that this is a bit like the Heisenberg uncertainty principle - i.e, the act of measuring the pressures changes the pressures.

I'm with Larry. Use a quality device to set your pressures and then don't bother measuring them. Using Karl Poetel's (sp?) advice, I put a nice T-fitting for my Schaeder valves. Basically, you set the pressure and then unscrew the plunger while leaving the nitrogen still connected. It ensures absolutely no leakage. Provided that you trust your 2-stage measurement device, your pressures should be exactly at those pressures.

Also, from what I've read, I also agree that canister pressures aren't the critically important factor. If somebody is saying they can feel the difference in canister pressures, then they are extremely sensitive to the car setup.

RickBetterley

I went ahead and bought the Longacre shock inflator with digital gauge as it looks like I can use it to add nitrogen to the Motons and set them to a specific pressure all at once.
Bought it from Rennlist-sponsor CDOC (Chris Lawson), who was very helpful.
I'll post a report once I get a chance to try it out.

Professor Helmüt Tester

I was thinking "Schrodinger's cat", but that's the physics geek in me. Besides, your shocks probably exist, whether you have a tool to fill them or not.

kurt M

Hats off to you sir! I was thinking of the Heisenburg principal during this thread but was afraid to bring it out. Schrodinger's cat trumps Heisenburg's geek factor.

The cat " Was that a fart?"

JBH

This is what I use except the gauge reads from 0 - 300. There should be very little pressure loss and you are reading the pressure at the shock canister. If you use a long hose (like me), there is a substantial pressure drop from the tank gauge to the shock canister.

I also have a full size nitrogen tank (carried in the trailer) and a welder's two-stage pressure gauge I bought on eBay. With quick connect fittings, the nitrogen tank also fills my tires and pressurizes the brake bleeder. At some point I'll add a Snap-on impact wrench.

Steve Weiner-Rennsport Systems

Jeff,

FWIW,....Both Moton & JRZ specify that the shocks should be in full droop to measure and adjust gas pressures.