Fanman

I got the ACt unit from Jason. I was going to do the Rb unit, but they told me if I was looking at 260-275 whp it might not be the best unit as they are not sure if it will handle that level hp. Mazdatrix is selling the Centerforce unit. I went with ACT as they have such a good rep. across the board on their products. I know a few people who have ACT on their other cars & absolutely love them.

monzter

I used to run an ACT clutch on my old car and made 7 consecutive(hot laps...3 minutes max between runs) high 11 second passes (maybe a couple of 12.0's) with an ACT 6 puck clutch and it never missed a beat. Even with a decent burnout before every run. Sold me on their product right there. I also had plenty of opportunities to deal with their techs regarding clutch configurations for that car and they were always extremely helpful. The customer service was great for me.

GrRx8MaZdA

Well some friends of mine installed the ms clutch+cover+fly and they are very glad with that parts..Well i already have a ms flywheel but i could change it if i am going for hte sr kit which already contains a flywheel...

But which kit is better??I mean i am always dcs off and making serious game with the tail everywhere i can and i always hit reds and trying to start immediately form a stop but which is better??extreme or heavy?Or should i go with ms clutch+cover???I mean i want the best from my car performance and i want the best laps offcourse...Also i m planning for this year somewhere arround 270-280crank and in couple of years over 300whp(I hope offcourse)

p.s Has anyone weighted the act clutch+sr flywheel together??either the extreme duty or the heavy duty???I am very interested in weights....

Fanman

No need to swap out your MS flywheel if you already have one. That is the pricey part of the package already. You can get the ACT pressure plate & disc (what SR includes in their package) part over at RX8store.

GrRx8MaZdA

which one though??extreme or heavy?????

Fanman

The one over at rx8store is the heavy duty version. In talking with jason, it is based on torque rating. the heavy duty version can take up to 400 lb.-ft. of tq, which our RX8's will never generate even close to that. I plan to go to about 9-10 lbs. of boost & it will be more than fine.

GrRx8MaZdA

Well i have my car as a daily driver...I know you have an act..Can you provide some infos my friend??Do you lose any rpms in engaging-deisengaging??So the only difference if i understand well what you are saying between the heavy and extreme is how much torque they can handle??No difference in disengaging speed-driveability etc between these 2 sets???
Can you provide more info on your set??Driveability?Is it easy to drive arround town?park your car??I am asking these cause i have my 8 for a daily driver...

I want to make the best laps and start from stop as fast as possible without loosing time...

I appreciate all your help...

GrRx8MaZdA

Act Heavy?Act Extreme?Spec Stage 2?Mazdaspeed??

What a dilemma...I ll drive this weekend an 8 with Mazdaspeed and if the difference is big i ll go fot them and what the f...I can't risk my daily driver car if its very very difficult to park it or move at low speeds arround otwn or when you are in traffic....

Fanman

If you are only going to go to 270-280 hp (crank) the Racing Beat pressure plate & clutch disc might be a good alternative. Clutches in general give a certain amount of clamping force. In general, the more clamping force, the more it affects driveability. i.e if the clamping force is increased 50% (ACT Heavy Duty) vs. 100% (ACT Extreme Duty), the heavy duty version will be a bit easier to drive. Usually with more clamping force they might switch materials sometimes (gets hotter, so regular clutch materials are not durable enough). In general, the heavy duty clutches aren't much more difficult to engage/disengage than a stock clutch, but once you get to the extreme duty or even pucked clutches the degree of difficulty increases.

The level of torque is how ACT wants to rate their clutches. 400 lb.-ft. (for a Mazda RX8) is a lot more then we will ever generate. In reading the descriptions of the clutch packages, the heavy duty will give you 50% more clamping force, the extreme duty 100%, the pucks probably in the 200% range.

GrRx8MaZdA

Well i ll drive the ms clutch on sunday so i ll know better...and i checked the spec stage 2 as a good option two...