Christov Member 16 Member For: 12y 7m 11d Posted 14/07/18 05:30 AM Share Posted 14/07/18 05:30 AM Howdy, After some general advice. 2014 FG Mk2 XR6 Turbo, Auto. My car was last tuned with 3.46 diff gears (stupid idea to change the diff ratio I know). On Monday 23rd July I'm having a new diff put in with factory 2.73 ratio. Question - will I need to get my car re-tuned? From a time saving perspective I'm hoping not, but boost will come on way lower in the rev range than with the 3.46 gears. I estimate in Gears 1, 2 and 3 probably over 1000rpm earlier. Any thoughts would be much appreciated. Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 16y 5m 23d Gender: Male Location: Perth Posted 14/07/18 06:06 AM Share Posted 14/07/18 06:06 AM I wouldn't have thought so. Most important thing is, is the speedo reading correctly. Link to comment Share on other sites More sharing options...
Christov Member 16 Member For: 12y 7m 11d Posted 14/07/18 06:11 AM Author Share Posted 14/07/18 06:11 AM Thanks. I'm having the axel ratio changed in some dealership level tool. Link to comment Share on other sites More sharing options...
NA_TURBO Member 532 Member For: 8y 6m 11d Gender: Male Location: Mildura Posted 14/07/18 11:20 AM Share Posted 14/07/18 11:20 AM Why are you changing the diff ratio back? I'm guessing ZF auto? Link to comment Share on other sites More sharing options...
Christov Member 16 Member For: 12y 7m 11d Posted 14/07/18 12:38 PM Author Share Posted 14/07/18 12:38 PM Correct, 3.46 with the ZF was horrible to drive. Link to comment Share on other sites More sharing options...
NA_TURBO Member 532 Member For: 8y 6m 11d Gender: Male Location: Mildura Posted 14/07/18 12:52 PM Share Posted 14/07/18 12:52 PM Oh ok, I was just curious as I've got a BF with the ZF and changed mine to 3.46 LSD. What didn't you like about it? Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 16y 5m 23d Gender: Male Location: Perth Posted 14/07/18 03:28 PM Share Posted 14/07/18 03:28 PM 1st would be crap, but the rest should be ok. that's unless you have big power, then it would just be wheel spin. Link to comment Share on other sites More sharing options...
NA_TURBO Member 532 Member For: 8y 6m 11d Gender: Male Location: Mildura Posted 14/07/18 05:14 PM Share Posted 14/07/18 05:14 PM 1st is crap anyway haha Link to comment Share on other sites More sharing options...
Christov Member 16 Member For: 12y 7m 11d Posted 14/07/18 10:55 PM Author Share Posted 14/07/18 10:55 PM 1-4th were crap. 400kwish Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 16y 5m 23d Gender: Male Location: Perth Posted 15/07/18 06:08 AM Share Posted 15/07/18 06:08 AM Well there you go. Its goes the more power you have the higher the ratio you need . So with 500rwkw, I could go from 3.73 to 3.46 or 2.73. Going the other way just makes wheel spin. BUT if you have say 240rwkw then going from 3.46 to 3.73 would give better acceleration. Link to comment Share on other sites More sharing options...
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