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#1
30-10-2010
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Argh! How do I set up shocks on Procat?
OK I give up... I really need help setting up the shocks in my Procat. It's been running well (transmission's holding up and even raced it a bit at Stotfold) but I can't seem to get it to handle or land right. I'm probably fighting a losing battle (I'll probably get a modern car next summer) but I'm sure I can get it to handle better.
I'm using the Tamiya aeration buggy dampers, which are the same as on the 501x and DB01-R. I'm using the bleed caps. The problem with the front of the Procat is the shocks are very layed down and there's virtually no adjustability. I've removed the anti-roll bar so I could move the lower shock mount out. I've had to use No.2 piston and 60wt oil just to firm it up and stop it bottoming out... but it feels odd. Using black Losi springs at the moment. At the rear I was using No.4 piston and 40wt oil. Losi yellow or pink springs. The rear is bottoming out after jumps and bending the rear wishbone carrier bolt. I've just changed the piston to No.3 with 30wt oil. Has anyone else experienced this frustration? Anybody remember how they set up their Cat or Procat? Any help appreciated. Cheers   
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#2
30-10-2010
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if you cut the schumacher ball cup down and use a raised spring cup and spring the fit the shocks for example tamiya or ae spring you should be ok also the what tamiya piston do you have are they the ones that come on the molded spru or the proper teflon ones that come with the worlds edition 501 the spru ones dont fit the bores very good.
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#3
30-10-2010
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Thanks for your reply. I've got the cnc pistons from the TRF hop-up kit... yes, they smoother than the ones on the sprue. I have to use Losi springs and cups because I'm using I&Q dirt shields. I doubt the make of spring is the issue (I've compared them on the Excel chart... unless I'm missing something) it's more the choice of piston, oil and spring stiffness.
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#4
30-10-2010
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Quote:
they are too long so you end up putting too much pre load.
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#5
31-10-2010
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i know the xls wouldnt handle very well without anti roll bars so try and get it back on there, if i remember correctly the front end is very similar. if its bottoming out landing try smaller holes in your pistons
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#6
31-10-2010
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Also, fit some stiffer springs if you want it to stop bottoming out. There are only 5-5.5 turns on the Schumacher springs, so the ones you have on in the pics are far too soft. BTW, those Schumacher springs were designed to be used with anti-roll bars, so I'm not surprised you car doesn't work too well...
HTH
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#9
23-12-2010
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Thanks for the detailed advice!
OK, got the blue AE front springs, shorten ball cups and also put the front roll bar back. Only thing to sort out now is the pistons in the front. If I remember rightly, didn't the old Cat pistons just have one hole at the edge? I saw this article by Phil Davies and it says he used 1mm pistons. Is that two holes of 1mm diameter each? I have some TRF blank pistons I could drill out. Cheers 
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#11
24-12-2010
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I'ved used Bosscat wishbones and 1/8 inch hingepins on the rear. These are much the same as the Procat ones, just stronger. For the front I'm still using the Procat wishbones but had to use a narrower top spacer with the Bosscat hub carrier.
Definitely need to sort the shocks out. What do the holes look like on the old Schumacher 1mm pistons?
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#12
24-12-2010
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i know my bosscat was on later shumacher shocks, used grey springs on front, yellows on rear, 50wt front 30wt rear, single hole pistons, dont know hole size though but could well have been 1mm, they were drilled out. if i remember correctly there were 2mm of spacers inside all shocks to limit travel, and i had 2 o rings on front shafts a bump stops too. cant remember what xls had on a such, front springs were standard kit, rears i think were from a pb maxima,
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#15
26-12-2010
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Quote:
I built a Procat for the York vintage series we used to do and I think I just put in the thickest oil I could find! G
__________________
Graham North http://www.atomic-carbon.co.uk https://www.facebook.com/atomiccarbon https://www.facebook.com/nortechracing 
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#16
30-12-2010
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from what I can remember of running the cats you will never stop them bottoming out have a look on youtube at the 87 worlds you will see cats of the day and how they performed it will look very similar to yours they always bottomed out heres a pic of mine
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#17
30-12-2010
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Thanks for your posts. I sorted out the ride height at the front with shorter AE springs and shorter Schumacher ball cups. The front roll bar is back on too.
Front: AE blue springs 4.2 rate, piston 2 holes 1mm dia, 30wt oil Rear: Losi yellow springs 2 rate, piston 2 holes 1.3mm dia, 35wt oil If dropped onto a tabletop from about 9" it lands comfortably without bottoming out.
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#20
02-01-2011
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Quote:
At last ....mvh isobarik but the paint was awsome.
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