Goosehands Posted January 23, 2018 Share Posted January 23, 2018 About a month ago I got my OBXT back after having an IAG Stage 1 block professionally installed. While everything was out I had a SMFW and Exedy OEM clutch kit installed since the DMFW was warped. I made it through the break in period babying her and I was finally given the OK to "give it some" by my mechanic. He is a really knowledgeable guy and has a good reputation for turbo cars (mainly GTRs but also subies). Fast forward about 1000 miles, in 5th gear around 3.8k on the highway I get up to 12psi and the rpms jump up to 4500 and the car goes nowhere. The clutch felt great all through the break in, a little light at first but felt great after about 400 miles or so. Grabbed nicely, nice friction point etc... I dont ride the clutch and I obviously wasn't beating on it since I was in the midst of my engine break in. Clutch pedal had little free play so I adjusted it a touch and also tested my master cylinder by clamping the line, clutch was rock hard. I may replace the hydraulic fluid anyway for good measure... I am running a vf39, not sure on the exact hp/tq numbers as it is still on the same tune that I bought it with but I was told that it was tuned to around 275hp. Who really knows though... What else is there to try? Could this be a slave cylinder issue or am I looking at an aftermarket clutch? This issue has happened twice now, could I have glazed my clutch that quickly? I am almost positive that there was a stock clutch in there which seemed fine before... I plan to call my mechanic tomorrow but I am afraid of hearing any more bad news. Link to comment Share on other sites More sharing options...
xt2005bonbon Posted February 1, 2018 Share Posted February 1, 2018 Did you call your mechanic? I just installed a lighweight SMFW and stage 1 Exedy clutch kit. I have done about 1.3K so far. Did not do a great job at babying it the first 500 miles . But I have not had any issues in terms of slipping. Link to comment Share on other sites More sharing options...
Goosehands Posted February 2, 2018 Author Share Posted February 2, 2018 Thanks for the reply, I actually ended up having to deal with some unrelated clutch issues (junk in my hydraulic lines) so I have not had the chance to talk to my mechanic. Glad to hear the stage 1 worked out for you... Unfortunately I went the budget route and got the "OEM" replacement. I'm wondering what the difference is between the two, if it's possible to just replaced the OEM springs with stage 1 springs instead buying the whole kit? Link to comment Share on other sites More sharing options...
xt2005bonbon Posted February 2, 2018 Share Posted February 2, 2018 I actually did not buy a whole kit. I bought each part separately (which may not be the wisest thing to do...). Here are the part numbers: flywheel: FF502 clutch disk: FD13H pressure plate: FC13T Link to comment Share on other sites More sharing options...
Max Capacity Posted February 2, 2018 Share Posted February 2, 2018 OEM, is not the clutch I would have picked for your set up. I have had good luck with Spec Clutch's there 2+ is a nice piece. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
bigleben Posted February 9, 2018 Share Posted February 9, 2018 I was finally given the OK to "give it some" by my mechanic. He is a really knowledgeable guy and has a good reputation for turbo cars (mainly GTRs but also subies). I am running a vf39, not sure on the exact hp/tq numbers as it is still on the same tune that I bought it with but I was told that it was tuned to around 275hp. Who really knows though... Your mechanic should have advise you a stronger clutch since your power level is higher then stock. When buying a clutch, first thing to check is the clutch holding capacity (hp/tq) vs car power level. Sorry to say this but you will need a stronger clutch if you want to use your car to its full potential. FWIW, I run a southbend stg2 endurance with OEM SMFW on my OBXT with a vf48 (newer version of the vf39) with great results. They ain't cheap tho... Link to comment Share on other sites More sharing options...
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