REVIEW: ScienceofSpeed Sport Clutch & Flywheel

**ffffanman** · 12-22-2011, 11:57

Wow, this rocks!
Thanks SOS.
Trev

**Nero Tenebre** · 04-17-2012, 14:48

Chris, I was wondering about the weight of the flywheel on this clutch by itself, according to the site it states:

Including a light flywheel, the clutch and flywheel assembly is much lighter than factory clutches - 11 lbs compared to the 1991-96 factory clutch assembly and 19 lbs compared to the 1997-2005 factory clutch assembly.

I believe that the oem dual disc clutch is superior to oem single disc due to lower MOI but Honda made the switch because people were having trouble with the initialization procedure not being followed and resulting in almost immediately worn clutches and complaints. When I last replaced my clutch, I used a 7 lb aluminum flywheel with the oem dual disc clutch and the results have been fantastic, with 45-50k miles on it so far so longevity of the dual disc has not been a problem for stock HP levels. The OEM single disc also seems to have plummeted in value, mostly due to its boat anchor weight and mediocre performance I would think. I realize that the SOS clutch is single disc and designed to be a more performance oriented single disc but was this design pursued to reduce complexity? Performance over the OEM unit should be much better given it's almost 20lbs ligther but I am wondering if that is mostly in the flywheel? I have seen some lightweight flywheels in the range of 13-15 lbs so I am wondering where this one weighs in, and if it is lighter than my current setup. Also, do you know the weight of the two OEM flywheel options without the clutches? I remember finding the weight and it was really heavy but I don't remember it. Obviously the SOS clutch is capable of holding more power than the stock clutch, so I am also wondering if it has to be "beefier" to do so.

**ScienceofSpeed** · 04-17-2012, 16:38

The weight is listed as an assembly as the entire entire assembly (pressure plate, disc, and flywheel) rotate on the crankshaft.

The clutch uses increase clamp force and a higher friction disc to achieve the increased torque capacity.

I'm not what you mean by the factory clutch dropping in price. Both the early and later have increased in price every year (about 20% since we began selling this clutch).

Please let me know if you have any questions,
-- Chris

**Nero Tenebre** · 04-17-2012, 18:18

I have been seeing the single disc clutches (oem) going for much cheaper than the dual disc units for the early cars. Prices from the dealer seem to be going up for all parts though. One more question, if someone has a 6spd using the NSX-R input shaft, can they still use this clutch with it?

**ScienceofSpeed** · 04-17-2012, 19:36

Originally Posted by Nero Tenebre

I have been seeing the single disc clutches (oem) going for much cheaper than the dual disc units for the early cars. Prices from the dealer seem to be going up for all parts though. One more question, if someone has a 6spd using the NSX-R input shaft, can they still use this clutch with it?

The later clutch is not sold with the flywheel like the earlier clutch. As a complete unit it's about 2-3x the price. Yes our clutch is compatible with the 6spd with or with out the dual spline NSX-R shaft.

Chris

**dfdtruckie** · 05-06-2012, 05:57

Chris, I'm looking for about 400hp for my build. Street driving mostly. Is there any suggestions/ tips for the install? Gonna have a local shop do it and want to know if there is anything I can do to avoid the possible "shuttering" that was mentioned. The Sport Clutch is the one I'm looking at. From the description it should suit my needs?
Thanks

**ScienceofSpeed** · 05-07-2012, 09:34

Originally Posted by dfdtruckie

Chris, I'm looking for about 400hp for my build. Street driving mostly. Is there any suggestions/ tips for the install? Gonna have a local shop do it and want to know if there is anything I can do to avoid the possible "shuttering" that was mentioned. The Sport Clutch is the one I'm looking at. From the description it should suit my needs?
Thanks

The clutch if properly installed does not produce shudder. It is as smooth, or as nearly as smooth, as a factory clutch. There are two things to watch for when installed this, or any clutch, on the NSX. These steps are covered in the installation manual included with the clutch:

1. make sure that excessive grease is not installed on the input shaft, which can cause the grease to splatter on to the disc mating surfaces as the transmission spins. This can cause shudder until the grease burns off.

2. inspect the release bearing guide collar for rust, galling, or other damage. Clean and lubricate before installing clutch (part 1 shown here):

-- Chris

**ffffanman** · 05-07-2012, 09:40

Yes, good point Chris, I had to change out part #1 once on mine, it was galled up pretty bad.

**Cozmo** · 05-07-2012, 20:39

Originally Posted by ffffanman

Yes, good point Chris, I had to change out part #1 once on mine, it was galled up pretty bad.

So did I. I ordered one at the same time as my SOS clutch and it was a good thing because my mechanic called to tell me that my old one was really bad and we would've been waiting a few days for one to come in while my car sat there torn apart in the shop.

I really like the clutch. The flywheel makes a substantial difference but doesn't make shifting much harder. You just have to shift a bit faster. Rev matching downshifts is a dream. My biggest regret is waiting this long to get one.