b.weeks Posted April 21, 2008 Share Posted April 21, 2008 Hi all, My car has been doing a fair bit of track time recently. I think somethings up with the gears. Regular driving it's pretty resistant and notchy putting the gear into 1st and 2nd. When de-accelerating for say a corner on a track, and putting into 3rd from 4th it screetches too - any ideas? Gear box rebuild? Cheers, Ben. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 21, 2008 Share Posted April 21, 2008 What clutch is in it? Could be clutch drag. If it *IS* clutch drag it will 8ugger the gearbox, especially in track usage. Quote Link to comment Share on other sites More sharing options...
b.weeks Posted April 21, 2008 Author Share Posted April 21, 2008 RPS carbon-carbon clutch ... (off to Google "clutch drag"). EDIT: Only just fitted the clutch too ... Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 21, 2008 Share Posted April 21, 2008 Did this start soon after, or even straight after the clutch change? If so I'd look to the clutch, either its fitting or its adjustment. Quote Link to comment Share on other sites More sharing options...
b.weeks Posted April 21, 2008 Author Share Posted April 21, 2008 My worry is we didn't give the clutch enough mileage to bed in. We were really up against it with getting it ready for Time Attack and probably only managed 300 miles before the first event. You can here the screetch on some of the down changes in the video ... We did Brands Hatch a few days before: And the screetching isn't quite so noticeable ... so guess it got a bit worse ... Notch first and second and crunching reverse (not always) has only just started happenning mind. Having said that, the box has always been quite notch but I always thought the Getrag was quite "agricultural" like ... (NB I had a Getrag 6-speed conversion a while back). Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 21, 2008 Share Posted April 21, 2008 I haven't looked at the video, as my PC has no sound working, but it sounds like a classic case of the clutch not releasing fully. If you are stationary and the car is in neutral, is it hard to get it into first or reverse, or does it slip in freely? Is it the same hot and cold? If i had a pound for every RPS clutch that exhibited clutch drag on MKIV's I'd be able to stay longer in the pub at the weekend In seriousness, and fairness though, i haven't had dealings with the RPS carbon / carbon clutch. is it a proper carbon clutch, or some play on words as the Yanks are want to do? Quote Link to comment Share on other sites More sharing options...
b.weeks Posted April 21, 2008 Author Share Posted April 21, 2008 I haven't looked at the video, as my PC has no sound working, but it sounds like a classic case of the clutch not releasing fully. If you are stationary and the car is in neutral, is it hard to get it into first or reverse, or does it slip in freely? Is it the same hot and cold? If i had a pound for every RPS clutch that exhibited clutch drag on MKIV's I'd be able to stay longer in the pub at the weekend In seriousness, and fairness though, i haven't had dealings with the RPS carbon / carbon clutch. is it a proper carbon clutch, or some play on words as the Yanks are want to do? It's hard to get in gear when stationary (probably when I notice it the most). When warm it doesn't seem as notchy (I think). Should be a proper RPS carbon-carbon clutch. What's the resolution? (I'm hoping your not going to say "get a new clutch" ) Quote Link to comment Share on other sites More sharing options...
b.weeks Posted April 21, 2008 Author Share Posted April 21, 2008 NB The car does have quite a bit of "pull" when you come off the accelerator - kind of like creep with an auto - is this related? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 21, 2008 Share Posted April 21, 2008 You mean when you press the clutch it still feels like the engine is connected to the drive train, and continues momentarily to give engine braking? If so that's clutch drag. Does it have a movement reversal set up, and provision for adjustment at the clutch end (IE is it a push type rather than the stock pull type clutch)? You may be able to get some adjustment at the MC end of things on the pedal push rod, but you *MUST* maintain some free play here. Who fitted it, don't they have some input here? What did the fitting instructions say about adjustment? What lap times did it do at Donington? Tappy was doing some reasonable times, in a car that shouldn't be on the pace of a proper car I reckon a decent RX-7 should wipe up. Quote Link to comment Share on other sites More sharing options...
Wez Posted April 21, 2008 Share Posted April 21, 2008 Sounds exactly like what mine was like before Chris adjusted it. Sometimes it felt like you had to push your foot through the floor to get it in gear, all good now though Quote Link to comment Share on other sites More sharing options...
b.weeks Posted April 21, 2008 Author Share Posted April 21, 2008 You mean when you press the clutch it still feels like the engine is connected to the drive train, and continues momentarily to give engine braking? If so that's clutch drag. Does it have a movement reversal set up, and provision for adjustment at the clutch end (IE is it a push type rather than the stock pull type clutch)? You may be able to get some adjustment at the MC end of things on the pedal push rod, but you *MUST* maintain some free play here. Who fitted it, don't they have some input here? What did the fitting instructions say about adjustment? What lap times did it do at Donington? Tappy was doing some reasonable times, in a car that shouldn't be on the pace of a proper car I reckon a decent RX-7 should wipe up. Cheers Chris. Yeah, that's a more technical way of describing it :-) Will have to refer some of this info back to Paul as not sure myself if it's a movement reversal setup or not. From memory I did a 1:23.5 at Donington. Quite pleased as I know there is more to come. Who's Tappy? Quote Link to comment Share on other sites More sharing options...
b.weeks Posted April 21, 2008 Author Share Posted April 21, 2008 Will this explain the screetching from say 4th to 3rd too? I thought this might be some synchro thing ... Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 22, 2008 Share Posted April 22, 2008 http://www.duncantappy.com/ He's ex Formula Renault champion and a uncoming hotshoe. He's paid to drive in Time Attack and will take some beating, IMO. 1:12.7 in a Subaru.... Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 22, 2008 Share Posted April 22, 2008 Will this explain the screetching from say 4th to 3rd too? I thought this might be some synchro thing ... probably, you are asking the synchros to work as a clutch, and they WILL NOT like that. Quote Link to comment Share on other sites More sharing options...
b.weeks Posted April 22, 2008 Author Share Posted April 22, 2008 probably, you are asking the synchros to work as a clutch, and they WILL NOT like that. You mean I should be heal-toe-ing? Mmm ... am going to have to practice doing that think. Although it does not screetch at not particularly hard downshifts now so assume the synchromesh needs replacing? Quote Link to comment Share on other sites More sharing options...
newbiematt Posted April 22, 2008 Share Posted April 22, 2008 http://www.duncantappy.com/ He's ex Formula Renault champion and a uncoming hotshoe. He's paid to drive in Time Attack and will take some beating, IMO. 1:12.7 in a Subaru.... That's amazing! Quote Link to comment Share on other sites More sharing options...
Ian C Posted April 22, 2008 Share Posted April 22, 2008 You mean I should be heal-toe-ing? Mmm ... am going to have to practice doing that think. Although it does not screetch at not particularly hard downshifts now so assume the synchromesh needs replacing? I think he means you should have a clutch that works properly -Ian Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 22, 2008 Share Posted April 22, 2008 I think he means you should have a clutch that works properly -Ian He does, actually Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 22, 2008 Share Posted April 22, 2008 That's amazing! Properly set up car, in qualifying trim, plus pro driver = good times I suspect that this series will have massive disparities in times between the professionals and the weekend warriors, which is a shame. Quote Link to comment Share on other sites More sharing options...
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