ACT Twin Clutch

[qwerty5678]

I have the ACT twin in my car after a horrible story.

I ordered my Twin end of February. In march i received the Twin. The Twin looked amazing. So i want to put it in my car soon.

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ACT promise complete direct bolt in clutch kit that requires absolutely no modification. That is why i ordered this clutch. Now i can tell you that this is not true!

When the clutch was installed it won't shift into any gear. I thought it was my fault, so i took the car to the local tuningshop. They put the tranny of and could not find any mistake. So they put everything together. After two times the conclusion was that it must be the clutch that is not engaging. Whe put an oem clutch in to check it is the clutch. The oem clutch works fine.

After contact with ACT they advise me that I must send the clutch back to the US. Cost me more than 200 dollar. After inspecting by ACT they find the problem. The pressureplate was an non-confirming unit.

When i get the clutch back i looked at the clutch. Only thing what i can see was the same clutch but they grind someting away from the middle plate. (you can see in the picture below)

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The local tuningshop put the clutch in and it works. Shifting is good, but the weight of the clutch is now so light that the rpm drops very fast by shifting slow. Also the car won't idle nice anymore and the car fall of when drive and brake for a stopping light.

The rattle with clutch in is very loud compared to an EXEDY twin from a friends EVO. I can live with it, but since the clutch is in I hear a very loud rattle between 3k rpm and 6k rpm. especialy when i go off the gas. Before the twin this sound wasn't there. Whe thought it was the transfercase that make some sound. But after whe changed the transfercase the sound was still there.

Whe think now that the rattle is from the TWIN.
It cost me total more then 3000 dollar to put the clutch in and make it work fine!!!

For this money i can buy a carbonetics Twin or six ACT normal clutches.

I am very disappointed in the ACT Twin and don't advise it to anyone!

 

[bastarddsm]

How much power are you making that you think you need a twin disc? Twin discs are considered a RACE clutch, and as such NVH is not a concern when designing them.

 

[qwerty5678]

How much power are you making that you think you need a twin disc? Twin discs are considered a RACE clutch, and as such NVH is not a concern when designing them.

I made 520+ lbs/ft torque with 600HP. So my almost new ACT 2600 was slipping on full boost. I burned the disk in a few pulls.

 

[brian9397gsx]

Unfortunately thats the nature of the beast with a twin. I agree I would of went with a diff brand if I were doing a twin. I loved all my single disc act's I've had but their twin disc is to new to make me want to experiment with it.

 

[bastarddsm]

Haha, 520ftlbs. A 2600 with a 6 puck can hold that with ease.

 

[qwerty5678]

Haha, 520ftlbs. A 2600 with a 6 puck can hold that with ease.

ACT 2600 with 6 puck- 513 ft/lbs = 695Nm

I made highest 565 ft/lbs torque on the dyno

 

[SOADweskey]

Other than the problem with the pressure plate that ACT fixed for you everything else you are describing sounds like a pretty normal twin disk.

I was running a PTT twin in my car and it worked out fine, other than changing clutch disks every 10k miles (standard for any racing twin disk) and the fact that it started deforming the spines on my input shaft and upon rebuilding my trans Jon at TRE could tell I had a twin disk on from the wear it put on first and second gear.

In order to not damage my new TRE Stage 4 trans unnecessarily I have gone back to an ACT 2600 with a sprung 6-puck.

Were you running a street disk or a 6-puck? I have seen people use the 6-puck up to 720 ft-lbs of torque and low 10 second passes. Way past it's rating but it was working.

If I end up making more power in the future and need to go back to a twin I will probably go with the QM setup with their hub system that protects the input shaft splines.