If you are running stock compression, you can pull over 500 whp with the out of box fuel system. The actuators might limit you though, but with everyone running the APS big exhaust, that shouldn't be a problem. The problem with hitting 500+ is when you introduce a lower compression motor. the fuel and boost needs go up in order to get to 500 hp. You can just upgrade injectors and go for it, but like you said, it will take some magic to get the unichip to control them properly.

 

So what clutch did you go with? Final numbers? How's the new power feel?

 

We are going back and forth on what clutch to get. Still deciding, so nothing has changed at this point

 

Ziv, have you considered the Clutch Masters FX600 or FX700 Twin Disc? They look like very nice clutches. I just wonder how well they perform.

 

Right now it is between:
Spec 3+ with stage 5 pressure plate
Exedy Twin Disc D-core
ATS twin disc with 1350kg pressure plate

Right now, Spec seems less than confident their 3+ will hold without the stage 5 pressure plate. I have concern that pressure plate will make the car hard to drive.

the Exedy is CRAZY expensive, but is supposed to be awesome in terms of how streetable it is.

The ATS is about the most I care to spend, should hold the power and have a longer life than the spec, but I have concern about drivability. I know sharif pushes these clutches and a lot of Z owners run them, but I have seen mixed reviews about the feel of the this clutch.

I looked at the clutchmasters briefly, but it looks like there twin discs are full metalic, which I would think would make them very harsh

 

Choosing a clutch is such an ordeal. You just never know until you drive with it. The carbon clutches make me nervous because I couldn't imagine driving without slipping the clutch. Good luck with your decision.

 

You guys are crazy. My mother who is almost 60 drives my Z with the ATS twin in there and she doesnt even have a negative comment on it.

Whoever says its hard to drive, needs to practice driving stick. While it requires a little more technique then stock, its EASY to drive.

 

Get the ATS and call it a day. Lots of people have used it with good feedback on here. Exedy is very nice as well however for the price its not worth it IMO. There aren't many Z's I know of that have it either.

Ziv - your spec is already shot?

 

The spec started to slip at 15 psi on the dyno. Only rated to 525 tq at the flywheel and I was making that at the wheels/hubs on GRD's dyno at 14 psi on my latest tune.

I am heavily leaning towards the ATS right now, but like I said, mixed reviews are leaving me second guessing. that would be the case on what ever clutch I decide on though. Just need to decide and get it done with.

 

Nice! Thats about 75 up from your last tune right?

 

What does your mother run in the 1/4? Low 11's?

 

Right now, I am up about 75 hp and about 50 tq from my last tune. We are going for one more lb of boost

 

+1....when ever I go out and get drunk my wife always ends up driving home. She is the most old ladish driver I know and she has no problems with the ATS clutch.

 

Well, I'm convinced now. If a girl can handle a carbon clutch, then I'm sure I could too. Ziv, get the ATS dual carbon.

Gman, do you have the dual or triple?

 

I have the dual. I've read the triple is even more streetable than the dual. If you're not going for anything below 600whp the dual should work just fine.

Mine has only slipped 2 or 3 times, but that was because it wasn't warmed up. After it warmed up it grabbed like a biatch.