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REVIEW: ScienceofSpeed Sport Clutch & Flywheel

Joined
30 October 2000
Messages
4,249
Location
Houston, TX
I purchase one of these clutches months and months ago. Due to certain circumstances, I did not get a chance to install it until recently. Then I had the stripped bolt to deal with.

Well finally, the NSX is running and I’ve been trying to drive it a little here and a little there. Now that it’s fairly broken in, I’d like to share my impressions.

DRIVEABILITY:
The clutch is VERY smooth. Not once has it ever shuddered, chattered, or made the slightest noise. This was very very important to me, and I can honestly say, it is exactly how I wanted it. I have to admit, I did stall it reversing the first time. Yes, you can tell there is a lightened flywheel in there. It revs quicker, and thus, the revs fall faster. I didn’t want to write a review prematurely, as I wanted to get use to this. As I drove it more and more, I got use to the clutch and we’ve become good friends. I can now drive it like stock and can’t imagine how slow and sluggish my car would feel like with the OEM unit back in.

Pedal feel is very similar to stock. No additional pressure that I could feel. I've been driving the NSX to work about 2 days a week and I've been enjoying the drive very much. The bumper to bumper traffic hasn't become anymore intolerable. :smile:

PERFORMANCE:
I did push it a little on the streets(within speed limits/with no cars around). A few times I power shifted into 2nd gear. The first time, my neck snapped back. It certainly grabs, there is no doubting that. Another time, I took the traction control off, and rear end broke loose and went sideways a little. Another time, accelerating in first gear, from a roll, I floored it and again the backed started wiggling.

Day to day driving, the car feels faster. Acceleration while cruising seems easier. No need to down shift, just give a little gas, and the car starts pulling. Of course, we are not talking about massive turbo/sc’er acceleration here, but it is noticeable. I think it’s the combination of mods, but I’ve very happy how the car feels.

QUALITY:
Only time will tell. So far, from what I’ve seen, I’m very pleased. The clutch came with everything needed to install and there were no hiccups during installation. Chris and SOS have been a pleasure to deal with and very helpful. No regrets, a great clutch, I couldn’t imagine a better option for me.

NEXT:
I’m hoping to add a s/c in the future. Even without boost, I'm really liking this clutch.


sportclutch_450.jpg
 
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After installation in one of my cars, my mechanic was so impressed that he started recommending this clutch for all his customers. I've been very satisfied with the performance of this clutch. Don't think it can be beat right now after factoring in all variables:smile:
 
Opinions are very subjective. Some prefer the firm pedal pressure, or the on/off feel of performance clutches.

I personally, prefer the OEM like feel, but with the added performance factor.

Absolutely what I was looking and ideal to me.
 
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How much lighter than stock?
Is this a twin disc?
Any idea on longivity driven normal?
That was a great review. I almost wish my clutch was bad.:rolleyes:
 
+1 on this purchase. I too have this same clutch and can't be happier with the purchase and I've had it for a few months now happy!!:smile:
 
gr8!

Thanks for the 1st hand experience, Z'! A big selling point for me is that I really like my RPS carbon clutch w/ the 6spd. This SOS Sport Clutch/Flywheel is quite similar & also it doesn't require the (labor/cost intensive) retrofit of the NSX-R twin-spline input shaft needed for 6spd. transmissions if an owner wants to use better priced '91-'96 twin-disc clutches. And as you mentioned, it can handle increased torque/H.P. if F.I. (namely SC) is desired down-the-road!

And lastly, having uncompromised vendor support on such a part/component is key.


Off-topic, but relevant thoughts/ruminations...

- generally speaking, why was the NSX dual-disc clutch design favored by many 6spd. owners & the '02+ NSX-R (instead of the single-disc application): was it due to benefits in performance -or- longevity -or- cost? I ask this, as the SOS Sport Clutch is a single-disc (but has both '91-'96 & '97-'05 fitment).

- I assume this SOS Sport Clutch has a lightweight flywheel; can an even lighter-weight flywheel be used, or is such unnecessary? Any comments/insights about how much quicker you climb in rev's w/ this setup (vs. your past OEM/stock clutches, after-market clutches, etc). That's one of the things I like right now about the RPS that is on my NSX & the very lightweight flywheel.

I know Z' researches the heck out of all his mods', hence why I'm asking here! :D
 
Re: gr8!

Off-topic, but relevant thoughts/ruminations...

- generally speaking, why was the NSX dual-disc clutch design favored by many 6spd. owners & the '02+ NSX-R (instead of the single-disc application): was it due to benefits in performance -or- longevity -or- cost? I ask this, as the SOS Sport Clutch is a single-disc (but has both '91-'96 & '97-'05 fitment).

I always wondered why the Type-R has the twin disc. But another thought, there has to be a reason that Honda changed from the twin disc to the single disc for the NA2???

Of course, I'm no expert, but my opinion, I prefer the single disc. It feels different to me. So single disc was a huge selling point as well. Also, if I ever get my hands on a 6 speed, I won't have to worry about the addition costs to do the additional twin-spline input shaft conversion or purchase another clutch.

- I assume this SOS Sport Clutch has a lightweight flywheel; can an even lighter-weight flywheel be used, or is such unnecessary? Any comments/insights about how much quicker you climb in rev's w/ this setup (vs. your past OEM/stock clutches, after-market clutches, etc). That's one of the things I like right now about the RPS that is on my NSX & the very lightweight flywheel.

Yes, the clutch does include a lightweight flywheel. As far as using a "lighter" lightweight flywheel, I'm sure it's possible, but I'll leave that question to the experts/Science of Speed.

The engine definitely revs quicker. Like I said earlier, it revs easily and equally, the revs drop quicker. I'm not sure how I'd feel about a lighter flywheel. I'm sure it would decrease drivability, until you master it. Interesting enough,SOS actually produced a video of the engine revving with/without the lightened flywheel. It gives you a good idea what to expect.

All in all, the clutch seems to be pretty well rounded, with no drawbacks in my opinion. As we know, it's pretty hard to top Honda's engineers, but I feel SOS has done it.

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BOOOO!!!!:redface: Z you wussed out. Dude a couple beers and your set, just have another pair of hands for help and some cuss words ready your set. Well It would help with an aircompressor LOL.

So what is next for the ride that's finally on the road again?

=g=



No sir, I had someone install it. I'm not up to doing a clutch in my garage. :redface:
 
Chris how would this compare to the dual carbon/carbon clutch in terms of pedal feel?

I'm making low 400'sRWHP and 300~RWTQ with your new SOS SC (yes, I'll write a fabulous review with 1080p HD videos).

HP/TQ wise this clutch appears to suffice. If I don't have any plans on going past the rated HP/TQ of this clutch is there something that I may be over-looking or missing out on the dual carbon/carbon clutch?
 
The pedal pressure is very similar between the two clutches. The engagement of the Sport is very smooth (like stock). The Billet Twin Carbon has some shudder in 1st and reverse, much much less than any other clutch that holds anywhere near the horsepower than the Billet Twin Carbon does. Based on what you have on your car, I would recommend the Sport.

take care,
-- Chris
 
The pedal pressure is very similar between the two clutches. The engagement of the Sport is very smooth (like stock). The Billet Twin Carbon has some shudder in 1st and reverse, much much less than any other clutch that holds anywhere near the horsepower than the Billet Twin Carbon does. Based on what you have on your car, I would recommend the Sport.

take care,
-- Chris

Safe to assume that the Sport clutch is quieter than the Billet Twin Carbon?
 
The pedal pressure is very similar between the two clutches. The engagement of the Sport is very smooth (like stock). The Billet Twin Carbon has some shudder in 1st and reverse, much much less than any other clutch that holds anywhere near the horsepower than the Billet Twin Carbon does. Based on what you have on your car, I would recommend the Sport.

take care,
-- Chris

Is there a noticeable difference between the rev-blip on each?
 
It would be great to see the moment of inertia (MOI) of the various clutch options on the SoS clutch set comparison page. As Chris mentioned in this post, it’s the MOI of the clutch and flywheel that impact how fast the engine revs, not the weight.

I have a Comptech Powergrip 1 clutch and flywheel in my car right now that’s 9.5 lbs lighter than the stock twin-disc unit. However, I didn’t notice any difference in how fast the engine revs after installing it. I was hoping the Powergrip clutch would make my NSX rev as quickly as my old 911 did. Unfortunately, it didn’t.

On the SoS clutch comparison page, it looks like the SoS Sport Clutch is only 1.6 lbs lighter than the Comptech Powergrip clutches. However, in this video, it looks like the SoS Sport Clutch does rev quicker than stock.

Does the SoS Sport Clutch rev quicker than the Comptech Powergrip clutch, i.e. does it have a lower moment of inertia? I’m looking to buy a new clutch too, but want something that revs quicker than a Powergrip clutch.
 
I also have a freshly installed SOS Supercharger so far my stock single disc clutch is holding really well I'm putting down around 390rwhp. Not sure when it will decide to let go but might pick one up over the Winter months and have it on standby. I'm looking for as close to stock pedal feel and engagement sounds like the Sport Clutch will fit the bill. Thanks for the review Zishan :smile:
 
I also have a freshly installed SOS Supercharger so far my stock single disc clutch is holding really well I'm putting down around 390rwhp. Not sure when it will decide to let go but might pick one up over the Winter months and have it on standby. I'm looking for as close to stock pedal feel and engagement sounds like the Sport Clutch will fit the bill. Thanks for the review Zishan :smile:

I'm making 405rwhp on a 3.0 engine with 105k miles on it and right at 300rwtq. this is with factory cats in places and a comptech cat back.

Looks like you have a 3.2 liter engine. i thought they make around 415rwhp at least.
 
I'm making 405rwhp on a 3.0 engine with 105k miles on it and right at 300rwtq. this is with factory cats in places and a comptech cat back.

Looks like you have a 3.2 liter engine. i thought they make around 415rwhp at least.

Holy-Batman!! lol I see yours is intercooled mine '00 isn't... or at least not yet... possible winter project. Tuner thought it could make more & to take it to 400rwhp but for safety we left it where it was, intercooling it to bring the temps down then we can go a bit higher he thinks should hit 415~430ish maybe? Running Ark DT-X exhaust + Comptech headers + Uni Filter drop in so my car hugs the environment all emissions are in place cats, O2's etc.
 
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