mjb1961 Posted November 19, 2015 Share Posted November 19, 2015 hi ,I would like to adjust if possible any cv's that will help the locos run smoother on slow running ,would anyone know if this can be done and which cv's to adjust ,thanks ,,mjb Link to comment Share on other sites More sharing options...
Rog RJ Posted November 19, 2015 Share Posted November 19, 2015 The R8249 has very few CV adjustments available. Poor running is more often caused by dirty track, wheels or pickups. Link to comment Share on other sites More sharing options...
Howbi Posted November 19, 2015 Share Posted November 19, 2015 Hi mjb...........this is where the shortcomings of the R8249 decoder are exposed because you can only adjust CV3 Acceleration Rate and CV4 Deceleration Rate........There is no provision to adjust Start Voltage or Slow Running.......However, I have an R8249 fitted in a Class 2P 4-4-0 with tender and it's slow running is excellent due in no small part to having pickups on both driving wheels and tender wheels...........My CV3 is set to 3 and CV4 set to 10. HB. Link to comment Share on other sites More sharing options...
Fishmanoz Posted November 19, 2015 Share Posted November 19, 2015 Yes, the 8249 is very limited in the CVs that can be adjusted, but no, this shouldn't affect slow running. Even adjustment of CVs 3 and 4 will have minimal affect on slow running as this involves little acceleration or deceleration anyway. Same goes for back EMF, the other thing adjustable with an 8249. As already stated, cleanliness is the clue. The exception of course is for those who implement custom speed curves but these are advanced features for those wanting to achieve particular outcomes, not something the average user is likely to need to make their locos run better. Link to comment Share on other sites More sharing options...
mjb1961 Posted November 20, 2015 Author Share Posted November 20, 2015 Thankyou all ,I generally keep the track clean anyway ,I alway wipe it with meths usually before running ,but I'm a bit lax when it comes to the loco so I'll start there ,thanks again ,,,,,mjb Link to comment Share on other sites More sharing options...
96RAF Posted November 20, 2015 Share Posted November 20, 2015 I've found those mini-brush things you get for teeth flossing are good for cleaning any grott out between wheel backs and pickup wipers. Link to comment Share on other sites More sharing options...
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