13.0 3.0 turbo

[Ondonti]

13.0 6g72 Sundance Duster - Video
Clutch was slipping bad but still got some decent 60's on my 2nd and 4th passes. Was pretty pissed that the clutch kept me out of the 12's. I ran the 13.0 and then upped the boost a little and ran slower because the clutch slipped worse.


Camera battery almost dead so i didn't spend time getting a pic that is readable when downsized.

[Reaper1]

Definatly congrats!!! You know you're making me jealous with your 60's though...LOL Of course you're cheating using slicks(I keed...I keeed).

I think you'll have 12's just by whifting a bit quicker. I notice that you're taking it pretty easy(and I understand that), but I also know that a few thousdandths worth of shift time would have gotten you your 12.99 at least!

Again, crongrats!

[JamesL]

Nice passes, get that clutch squared away where you can be really comfortable hitting it hard and 12s will be a cake walk.

[Ondonti]

Quote:

Originally Posted by Reaper1 Definatly congrats!!! You know you're making me jealous with your 60's though...LOL Of course you're cheating using slicks(I keed...I keeed). I think you'll have 12's just by whifting a bit quicker. I notice that you're taking it pretty easy(and I understand that), but I also know that a few thousdandths worth of shift time would have gotten you your 12.99 at least! Again, crongrats!

Fast shifts = clutch devastation
But im not too fast at that in that car because that car makes me paranoid. I broke a PP last year.

[Ondonti]

Clutch looks dry!!!!!!!!!!!!!!!!!!!!!!!!!!!!
But look how dead it is! Its been spinning hardcore! I am amazed it was still running 13.0 last friday!
down to the rivits. Clutch only has 500 miles and almost all of that is freeway.

[turbokid]

time for a better clutch. You must be doing some WOT on the freeway or that is one shitty clutch.

[Reaper1]

HOLY CRAP!!! You anihilated that thing! I'm not sure what to blame here. It could be the PP is not as strong as it needs to be or the puck material was not grabby enough. I did notice that you said it only had 500 miles on it and most were freeway. The fact that I've always been told that 500 miles is the minium break-in time for a clutch and that it had to be stop-and-go type driving makes me also wonder if it not being broken in propperly might have lead tot he failier.

In any case you are going to have to replace the friction surface on the flywheel for sure and get the PP resurfaced! I'd have them check the face pressure of that PP when they do that, just to make sure it's at LEAST TIII spec.

I STILL am a firm beleiver that a twin organic disk clutch set-up would be far superior to these ceramic puck clutches with high face pressure PP's....Something worth possibly looking in to, Brent. I know for fact it'll be in the $600-800 range, but in the end I think the fact that you'll probably never have any more clutch issues if you get that and propperly break it in would be worth it. I know when I build me next engine for my Shelby Z i'm going to give that some serious research!

[Ondonti]

I glazed the clutch because I installed a 91+ transmission on a 89-90 length clutch cable. Means the cable was too tight and the pressure plate was not grabbing all the way. Tried new slicks and glazed the clutch. Once that happens the clutch is toast. I fixed the cable problem by swapping to an older style clutch arm but the clutch was already dead.


Ceramic puck and other high performance clutches do not "break in"
They either hold when new or they dont hold.
The same night I was running my 13.0's, there was a supra there who had a brand new $5000 Tilton Triple disc as of the night before. He was putting down 23psi with his gt4788 turbo through that brand new clutch
Ive never seen anyone break in a performance clutch, not a single 9-10 second honda/ dsm / supra etc.
Once the clutch has been through a heat cycle, if it wont hold, it will never hold.

It probably has more like 700 miles on it, and it only got ruined with about 500 miles on it because Bansheenuts new slicks just gave too much traction with the pressure plate not clamping all the way. The pressure plate went a few hundred miles like that. I am mailing the clutch and PP in so they can be inspected/fixed etc.
I ordered a new friction surface last week but I doubt it will come anytime soon. Everything else I orderded then came after 2-3 days but unfortunately the friction plate was ordered from one of our vendors.

[Ondonti]

"13. Do ACT clutches require a break in period?

For organic street discs “00 and SS” we recommend breaking in the clutch for 200-300 miles with mild engagement such as stop and go city driving prior to racing or spirited driving. ACT race discs usually only require a few hard slips to lap in the surfaces prior to normal driving or racing. Do not overheat the clutch during the break in period."

It doesnt make any sense to sell a race clutch that can be used until it is "broken in"

And of course breakin in has nothing to do with mileage, but the number of engagements that you do (or cycles).

[Reaper1]

I agree with your last statement for sure. The place that built my clutch is also a very well known shop that does semi clutches and the like. Talk about some HUGE 3-puck cermic disks!!! HOLY COW! Anyways, they advised me to "break in" my clutch for the above prescribed time. Now, mine is a 6-puck, so it is different, and maybe that's what made the difference in their advice? I don't know for certain, but if a manufacturer tells me to break something in before using it hard...I try to do it.(notice I said "try" LOL )

I do understand what you're saying, I was just relating our two, obviously different, experiences....

[rx2mazda]

Ohhhhhhhhhhh, so close you could taste it.

I'll race you to get to 12's. My previous best is 14.80 @ 95mph(clutch slipping horribly,boost issues,KR,ETC). Got some new goodies including Devils Own WI, Turbo, FWD 3bar, 2-stage BC. I can't wait to see what she will do. Good luck with yours!!!

[phantomrt]

How do you break in a clutch that is either On or Off?

[Reaper1]

All I know is that I *can* slip my 6-puck ceramic clutch, but it doesn't do it for long...it grabs within a second or so.

[xtrempickup]

oh im racing both of you for 12s, i should be there with traction this year

[Ondonti]

Shouldn't be a hard race if I dont get my clutch stuff soon.