Guest kwiktoy Posted September 6, 2007 Share Posted September 6, 2007 Hope someone can help. I have a MkIV turbo 6 speed, 61 mm single conversion. I recently changed out the stock clutch to a Stage 3 clutch and since then I have problems getting into 2nd gear during a hard high revving shift. It's impossible to get a decent launch at the strip. No problems whatsoever in normal driving, even in fairly enthusiastic mode. I also find it difficult to get into reverse sometimes and occasionally have to stop the engine and then put it in gear and then restart it. Friends of mine say it's the syncros but the box never grates and I never had any problems before I changed the clutch. The shop that sold me the Stage 3 also resurfaced the flywheel (yes, they know what they're doing). They said they took off about as much as they would do before recommending a new flywheel. I am wondering if this might have anything to do with my problem. Any advice would be much appreciated. Thanks! Link to comment Share on other sites More sharing options...
Ark Posted September 6, 2007 Share Posted September 6, 2007 Mine can be a bit like that, unless the clutch pedal is down as far as it can go. Basically the clutch isn't releasing properly. Apparently the biting point can be adjusted, but I just learned to live with it. Link to comment Share on other sites More sharing options...
Guest kwiktoy Posted September 11, 2007 Share Posted September 11, 2007 I've tried adjusting the clutch at the pedal. I don't think the problem is there. There is no creep of the car with the pedal down in gear and the engagement distance is within Toyota spec. I agree that it seems that the clutch is not disengaging but why only upon drag starts at high revs? On normal spirited road shifts, it's fine. Anyone else got any ideas? Thanks. Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 11, 2007 Share Posted September 11, 2007 If you were to dismantle the clutch and check the pressure plate thickness, and the geo of the diaphragm spring you'll probably find it's all to pot, hence you have clutch drag, even with the pedal mashed into the carpet. I have found a lot of these "super clutches" are built around used cores, with re ground pressure plate castings. I only use brand new parts in the covers of my clutch, as it saves this sort of problem. There are ways around it, but the cost of implementing them will be more than buying another clutch that actually works properly. If you adjust the pedal pushrod to attempt a fix you may find the release bearing soon fails, as it is then under a permanent thrust, or the clutch starts to slip, as full load is lost off the diaphragm. Link to comment Share on other sites More sharing options...
Guest kwiktoy Posted September 12, 2007 Share Posted September 12, 2007 Thanks Chris. The shop that sold me the bits is a specialist clutch shop. They're called South Bend clutches in Indiana, US and are quite well known in the Supra community in the US http://www.dxdracingclutches.com/home.html I was there when they made it up. They used a brand new Toyota pressure plate and made up a custom disc (Stage 3 OFE). A concern they had was warp on the flywheel and they said that it was right at the max of what they would resurface. The problem I have started right after I installed the clutch. South Bend said that it was probably a case of wearing it in and making some clutch pedal adjustments but that was a year ago now and it's not gone away. It's fine on the road, even spirited gear changes, just useless on the strip to get a really good 60' time and low quarter. Could a deep skim off the flywheel (say 100 thou) be causing my problem somehow? Thanks. Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 12, 2007 Share Posted September 12, 2007 100 thou inch off the flywheel is a hell of a lot, and skimming dual mass flywheels is iffy and not recommended. I suspect that, if the clutch is engineered correctly, and your release hydraulics and mechanics are fine, then this could well be the reason for what I presume to be your problem, namely, clutch drag. Link to comment Share on other sites More sharing options...
Oily Posted September 12, 2007 Share Posted September 12, 2007 Had a clutch fitted, would not go in to 1st or reverse, not on a supra. Believe it was because the plates had not been lined up correctly, and were forced in? Link to comment Share on other sites More sharing options...
Guest kwiktoy Posted September 23, 2007 Share Posted September 23, 2007 Fixed it. Bushings on shifter fork tripod assembly were worn. Replaced them and everything is fine now. Link to comment Share on other sites More sharing options...
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