Taffy said:
bushie i think we need you to get doc privilages to upgrade our suspension section. i haven't got a clue what you are on about half the time but i can't fault your enthusiasm sir!
if even you can't understand what I'm on about Taffy then I have no business meddling with the DOC.
for suspension its really pretty good as. is the only thing I have experience with that could be improved is the method of reducing MV float adds prelaod to the MV spring and there is no description of how the MV spring stiffness and preload influences damping.
its really a very important tool for tuning. no MV spring with 0.2mm float is reported as the shiznit in rocks by more than just me. you loose a little long stroke LS but can add it back to the BV again increasing cart pressure and further reducing cavitation. or lossing that LS may be just what you need to get nice dip for the corners.
some description of the function of a BV face bleed shim in increasing LS stack lift and reducing initial harshness could be good.
I'm not fully there in understanding yet but there are a few things wrong with the 12mm rod forks that can be improved. for those wishing to buy a better BV for the 12mm rod forks Terry hay makes them. The smaller rod displaces less oil though the BV and more flows through the MV. the BV ports are now too big. the Bv is over digressive (read penske shock doc for explanation) and the BV shims lift less than on the 14mm rod forks. result is that
initial harshness is increased.
basically its almost impossible to get enough HS damping on the BV to maintain proper cartridge pressure and reduce cavitation without having a too harsh LS or MS and initial harshness. this was the problem that led me to the 3 stage BV with flexy backers. and the same problem that led me to make the MVs with 2.5mm HS lift. Terry hay improved the BV to address the same propblems and I copied that idea. seems to be good so far.
Ktalks solution exept those using very soft or no MV spring is to rediculously soften The BV...................... MUSHY cavitaing MUSH i say. crisper less harsh forks are possible.
I'm only just getting into the shock so I don't really have anything useful to add. the pressure is important for desert racers obviously. there is SFA difference
on paper between a SR 8.4 and a PDS 0 ask lew
what he's using now. lighter fast guys may benefit from stiffer fork springs and a lot softer rear spring than is recommended by spring charts.
the bleed equipment is great and I have enough equipment to get vacuum and pressure applied to the process but I think that it should say something about using a bleed bottle, patience and common sense as being very very good, easy and simple. lews emthod of a shock body extension for filling makes life easy too. your N2 filling equipment is awesome! I'm jelous. a link to smorgys pics for a very simple schrader conversion may get a few more people into shock tuning.
perhaps in jetting something like " lean condition: revs but won't pull. rich condition; pulls but won't rev" and perhaps "with appropriate tall gearing you can use top speed in 5th as indicator of peak power at xRPM and top speed in 6th as indicator of peak tourque at YRPM." if thats even right ? its a tip from some guy who made my metering rod. he also advised that jetting for peak tourque needs a larger MJ than jetting for peak power? its a tricky balance with the 650 where the oodles of tourque are nice but power is nice too.
might help somebody. the kehien jetting chart could be modified to make more sense for the MJ, MAJ. slide cutout influence and fix up the discrepency between the needle position and taper influence and be posted in there too. just a thought your the man for jetting obviously. I'll do another scribble on one and send it to you for exam marking if you think its worth doing.
Taffy the doc is very very good and easy to understand hats off to your efforts. I guess the idea is to keep it that way? too much suspension info from me might be bad?
regards
Bushie
