Richyd Posted January 23, 2007 Share Posted January 23, 2007 I am planning to fit a 6-speed box and LSD to my 1.6 ss in the next few months, as well as planning to tune the engine a little (already speaking with Oilyhands). I currently run on R300 15"wheels with 195/45/15 CR500's. Needless to say, these have a smaller rolling circumferance than the standard wheels, so, with this in mind when I fit an LSD, should I opt for the same siza as my current diff, 3.92, or should I drop to a 3.62. 🤔 🤔 🤔  My current thoughts are that the 3.92 suits my current 5 speed very well, but that the 6-speed would work well with a 3.62 and my current tyre size (essentially an R300 setup) - especially as I plan power upgrades in the near future and I don't want to have a too revvy engine on the motorway - n.b my driving is mainly weekend blats incl some fast A roads and motorway, but I do plan a few track days in the summer. Cheers - Rich Passed my test in 1988, but still I'm learning to drive! here Link to comment Share on other sites More sharing options...
rgrigsby Posted January 23, 2007 Share Posted January 23, 2007 Having run a 6 speed box with a 3.92diff I can confirm it is does lead to very short gearing which equals LOTS of revs all the time. Great for my old steel 8500rpm crossflow but probably not ideal as an every day solution. I'd go for a 3.62LSD. Rob G www.SpeedySeven.com Link to comment Share on other sites More sharing options...
knowley Posted January 23, 2007 Share Posted January 23, 2007 My R300 has a 3.92 LSD and for trackdays you can't beat it 😬 Motorway driving is quite annoying though as the revs are high... I'd not change for a 3.62 because the thought of losing some acceleration doesn't appeal to me. Link to comment Share on other sites More sharing options...
CanAm Posted January 23, 2007 Share Posted January 23, 2007 Rich, I have a 6 speed Supersport (Tim Neill's old car) which seems to have a 3.92 judging by the gearing. Great for blatting about but could be tiring on a long motorway trip. If you want to see what a 6 speed would be like on the motorway, just leave yours in 4th (top in 6-speed is same 1:1 ratio as 4th in 5-speed) and try driving like that for a while. Â Alan Link to comment Share on other sites More sharing options...
Nick Pargiter Posted January 23, 2007 Share Posted January 23, 2007 Rich It depends how much time you plan to spend on the motorways. My 1.4ss has a 6-spd and 3.92 LSD, driving down the French autoroutes at about 80-85 its running just under 5000 rpm. This can get tiring after a long run but the fun when you get onto the back roads/track days makes up for it 😬 😬. As Alan says try yours in 4th to see if you can live with it.  Nick Link to comment Share on other sites More sharing options...
F355GTS Posted January 23, 2007 Share Posted January 23, 2007 Rich I had a 6 Speed with 3.92 on my VX and at Silverstone I was running out of revs by the Bridge on Hanger Straight (this with an 8.5k red line) I've changed to a 3.62 and it's perfect now! Mark Link to comment Share on other sites More sharing options...
Miura Posted January 23, 2007 Share Posted January 23, 2007 Mark, did you have the 3.62 or the 3.92 when I was your passenger at Silverstone? Link to comment Share on other sites More sharing options...
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