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Gearing for stock classes
Hello there, I just got a x4 pro and wanted to run 17.5t non boosted class. However I couldn't get the gearing right with the 85t spur, are there any other spurs which fit? Currently need a 5.5-6 fdr according to the guys that run.
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#2
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Your gonna need a 40t pinion to gain a 5.52 fdr or a 36t for a fdr of 5.97 The spur for the x4 seems the same style as the Mad Rat/Mad Monkey which are 80t so you could go 38t to gain a fdr of 5.47 or 34t for 6.12 fdr Search for Mad Rat Spur (JE Spares) and there should be a pic of the MR/MM spur Hope that helps?
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#3
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Thanks for the help. |
#4
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If that car uses the same layshaft as a Mad Rat you can use t4 spurs which are available in 78t. I think a 75t is also available.
Losi Kevlar Spurs also fit. Again, if the transmission is the same as the Rat it's a 2.6:1 ratio. When I had a 80t spur fitted to my MR the largest pinion I could fit was a 30t unless I slightly modified the motor plate. This gave me an fdr of about 7:1
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#5
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Quote:
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#6
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Sounds like you might struggle getting the fdr required for that type of motor without moding the motor mount/a spur from another buggy!
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#7
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I got 7.1fdr lowest and am trying an x12 with max timing see how that goes.
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#8
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You can just get a 28 in there but with a bit of modification the 80 from the madrat will go in and you may just get a 32 in there
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#9
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You can get the AE spurs to work BUT it takes a fair bit of modifying
PM me if you want instructions.
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