So I go to the local 1/8 track( its all we got close ). It was cold and I dont think these ****ty bfg all seasons are helping at all. I couldnt manage to get better than a 1.9 60ft and no faster than a 7.8 @89mph. I am starting to think my exedy twin is slipping. I obviously spin out of the hole. LC set to 5800. Once out of first, I go into second. Most of the time, 2nd is fine. As soon as I get into third, I maybe get to like 4k and it just revs to redline, making me shift to 4th in the 1/8.

I have never smelt any clutch burning. My buddies tell me I am spinning. The temp was 45* tonight. Track was terrible prep, like always. But, this is really beginning to **** me off. It seems the track is about the only place I experience this. My car makes 440 vd. I cant see it spinning the wheels at the top of third and even 4th sometimes? Some runs are far worse than others. My first pass tonight, I made it to the top of 4th, in the 1/8! cause it spun so much, I had no powerband. This was with a fully warmed up car after an hr drive to the track.

I went to do a small burnout to maybe "warm"the tires up. Revved to my 2step slipped/released the clutch and spun a bit, and then pressed in the clutch and my rpms were hanging in the 4500 range. Is this my clutch dragging? Getting hot or something? I cant remember for sure what I did, but I think I pressed the clutch in and released it and the rpms went down to idle.

Exedy twin has about 7k miles on it.

What are your suggestions?

 

Clutch is slipping it sounds like. Get a triple and be happy.

 

I drove around on the street today and did multiple pulls and got no evidence of anything slipping. Maybe its just this track is NEVER prepped correctly.

 

when was the last time u did a boost leak test?

 

Devin from Boostin did one about 4 weeks ago when I got my sd tune. How would that affect it? Just wondering.

Car runs great on the street, it just seems on the track it gets this slipping. I just couldnt really see my car spinning the wheels so much with 440hp. Maybe this torquey little green rips the tires loose more than I though.

 

i said that only because you said that it shot up from 4000 to redline so quickly but from what ur saying maybe it is your clutch? i've been thru three exedyhd twins and when i had the old style green on e85 i ran 7.1s in the 1/8 and 11.1 in t he 1/4 when mine started slipping it was at the top of 4th. but you having the hta you might just be blowing off the tires on a slippery cold track, i get like 22-25,000 miles out of mine but that depends track visits and driving styles. good luck hope you get it sorted out, not much time left this season

 

Unfortunately it sounds like the clutch is slipping to me. I doubt that you are breaking the tires loose in 3rd gear at that power level. Depending on how your car is tuned, setup, etc. you could be hitting maximum torque in 3rd gear at around 4000 RPM which could be why the clutch starts to slip at that point. Once the clutch gets hot (launching & repeated hard runs) it is going to slip worse, so maybe that it why it doedn't seem to do it on the street.

As far as I know a vacuum leak isn't going to make your RPM shoot up like that.

Dan (drb)

 

That was my first instinct as well. Maybe its getting warm and slipping because of it. Although, it was 45 degrees outside and my car had been parked for almost 20min after arriving there. I went to make my first run and got a decent launch, but it jsut spun, spun and spun some more. I can make 6-7 passes a night with 20min cool down between all of them. Then on the road leaving the track, I can hammer it and all is well.

I think this weekend was a combination of poor track prep, it was cold, 42 was as low as it got. With only, prolly, 40 or so cars that night, the track wasnt really warming up to much.

I can hammer it in 3rd from like 2500 and run all the way to 7200 with no signs of slipping on the street.

Assuming most of you think I am running at a nice track, this isnt the case lol. This is some rinky dink track, where they basically cleared a corn field and put this in lol. I emailed someone from their website about track prep. He said on fun nights, there really isnt any. He said that the actual test and tune nights is when they do their best to really prep the track.

 

Almost sounds like you are slipping too much in the launch causing it to get hot (which you may be mistaking for spinning) and then it just dosent hold in the higher gears but is fine when it cools down..

 

Are you using a fork stop? Check to make sure its adjusted properly.


-Em

 

I'd think that you can find out this way, if the RPMs go up but the speedometer does not, it's a clutch slipping.. but if the RPMs AND the speedometer fly up at same rate/time, it probably is spinning tires, if that makes sense..

although I've never looked at my speedometer in my Evo when the tires spin, but I would have to imagine the mph would go up dramatically with all 4 tires spinning

 

First off, the fork stop question, like STM asked. With the power you are making, you're not spinning the tires in fourth. A boost leak will never make the RPM's shoot up. That makes no sense at all. As for the smell, you won't smell a twin burning like you smell an organic clutch burning. Your all seasons aren't the problem and if you were spinning in fourth, you would know.

 

Yes, i have a STM fork stop. I adjusted it so its about 1/4 or so away from the clutch fork with the clutch released.

I guess I could check next time, which wont be till next season now , on whether the mph goes up as well. I didnt think I would make enough power myself to spin in 4th.

On the street, Ive never experienced this issue.

Ive been to the track before where I hadnt experienced this. But most of the time, once I am at the track, I do. Ive ran a best of 7.6 at 93 mph, with a 1.72 60ft. Something was correct that night.

 

It IS your fork stop guaranteed.

I think those things are garbage. They require constant adjustment and they lead to premature clutch wear because they eventually allow the clutch to slip. People don't readjust the fork stop until the clutch fully slips and trust me, the clutch is doing a good amount of slip, wearing itself out before you see it doing a full slip like you experienced.

They should only be used by people who are regularly popping the clutch clips off, who are few and far between.

Trash it.

 

Hmm, ive experienced the same issue at the track before I put the fork stop on though.