Mavrik Posted August 4, 2023 Share Posted August 4, 2023 Hey all... my 350z GT HR 313 Roadster (82k miles) has a Gearbox syncro issue! At high revs changing down from 4th to third on track the gear crunches big time (fine at lower revs) Is this defo a synchro issue & will changing out the box oil & adding molyslip help??? Or is it rebuild time? Quote Link to comment Share on other sites More sharing options...
marzman Posted August 4, 2023 Share Posted August 4, 2023 Just double de-clutch and you'll be fine - clutch in, gear to neutral, clutch out, clutch in, gear to third, clutch out. In my experience changing the gearbox oil and adding moly slip made little difference, but the above ensured smooth gear changes forever more. Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted August 4, 2023 Share Posted August 4, 2023 Yeah, as above, you are beating the syncro. Quote Link to comment Share on other sites More sharing options...
Mavrik Posted August 5, 2023 Author Share Posted August 5, 2023 Double de-clutching on track at around 85mph & 7k revs into Paddock Hill isn't really an option! As said, at low revs on road I don't beat the syncro unless I'm really blatting. Quote Link to comment Share on other sites More sharing options...
Mavrik Posted August 5, 2023 Author Share Posted August 5, 2023 Double de-clutching into quick bends at around 7k revs & 85mph whilst also heel & toeing/rev matching isn't possible, surely lol... Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted August 5, 2023 Share Posted August 5, 2023 The VQ35DE and HR is a torquey wee beast and I certainly would not be changing down at 7000 rpm. Either get some track driving lessons or fix the gearbox or perhaps both. Quote Link to comment Share on other sites More sharing options...
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