The TT set up is not a kit, it is completely custom using the same 60-1 ball bearing that I would be using.

 

That custom kit on the NSX sounds impressive. However, keep in mind that the two cars are very different when it comes to forced induction. One of the biggest differences/problems between the two is the CR of the f20c motor. Also, the NSX has been around for 10 years now and there is a lot more known about how it handles forced induction.

As for your list, I need to know exactly how much boost you plan on running as well as desired hp output. Additionally, you mention an AIC and fuel pump for fuel, is this all you plan on using for the fuel aspect of your car? How do you plan on tuning the car, what gauges are you purchasing for this kit to monitor and tune the setup?

What I'm getting at is what you'll need for a complete kit. You've mentioned some of the basics for turbo related parts, however this is a small portion of a complete kit needed to genereate a lot of semi-reliable power. Right now imo, this will not be reliable at all and is not even comparable to the Comptech SC in reliability.

Also, there was no intercooler mentioned in your list. 5psi?

When you say custom tubular exhaust manifold, who is building this custom manifold?

I think we are a long way from having a reliable and complete turbo kit from what you have on your list. I'd like to get you pointed in the right direction, but if your at $8000+ right now, your probably only half way there money wise.

I designed a turbo kit for the S2000 on paper a while back and posted it online. General response was, too expensive. Sure, you can do it cheaper but forget about reliability. Because of the dissapointing reponse, I scrapped the idea of manufacturing the turbo kit. Its too bad, because I love turbos...

Lastly, about the direct port..
sure it can be done on the S2k. You could probably run a 80hp direct port. A NOS controller would be recommended so that all 80hp doesnt hit at once. If you plan on drag racing your S2000, this might be a good idea. For real track racing, this would not be a very good idea. For reliability, I'd never recommend NOS, a lot can go terribly wrong. I'd like to keep this discussion more turbo based, but yes in theory if you were to drag race your S2000 a direct port 80-90hp NOS kit would be a much cheaper alternative to the Comptech SC or turbo. They are a lot of fun, just not that smart.

Ben

 

Hey people-

Why not Comptech? The kit is as good as a forced induction kit gets, and from a relatively well regarded company.

The questions you should be asking are, why forced induction at all? What would the long term effects on this motor be when pressurised? What were the design limitations of the engine when Honda spec'ed it out? How does that effect the internals? And, finally, what was Comptech's criteria for this supercharger kit?

I personally am not too thrilled about forced induction on any Honda- there are too many reliablity issues to deal with, and with the F20C being on the edge as it is when stock, I don't think force feeding it air will help it in the long term. I hope Comptech somehow proves me wrong over the next few years..

-Nick

 

One thing that hasn't been addressed here yet is that some of you are trying to compare a one-off custom built system with one that was designed from the beginning to be a production part backed up with our standard 2 year warranty. Plus we intend to have our supercharger kit CARB legal fairly soon. Those are features you cannot get with a one-off system. I'm not saying that a custom turbo system wouldn't out run a supercharged car, but we didn't design our kit for absolute maximum output. It's a difference in design parameters.

Also, many questions have been raised about how we would handle the warranty is the engine blew-up due to the blower. It is something we don't address in our terms and conditions. So far, there haven't been any engine failures with supercharged NSX's. But going back about 5-6 years ago when we were first developing a clutch for the NSX, there were several exploded pressure plates and they took out the bellhousing in the process. We paid for the new bellhousing, new clutch parts and the labor. Then we redesigned the clutch/flywheel and there have been no more failures. That's just the way we do it.

 

Oh, one more thing.

Regarding the comments on the ball bearing turbo. In theory it sounds good. We tried more boost at low end during the development of this kit. After all, our original goal with this car was to get more low end and mid range power. We couldn't get hardly any improvement down low with the increased boost. I'm not the one who was doing the test, but I'd speculate that the computer was responding to slight detonation by backing off the timing and the result being similar power. This car has been a struggle to get power out of, and we found the most "normal" mods don't result in power gains and sometimes result in power loses.

 

I am not an expert in this field but I happen to own both a supercharged NSX (Comptech) and one of the few (thus far) supercharged S2000s. In the 5 days that my car has been supercharged I have been amazed and how little its around town driving characteristics have changed. The car is very flexible and lots of hp is available if needed. Very similar to the NSX. NSX kits have been so reliable that many Acura dealers are installing them on new NSXs before sale. I have had nothing but pleasant experiences with Comptech but I have seen catastrophic failures with one-off turbo kits. Don't compromise the quality and reliability of a $35k plus car just to impress the guys with the preludes and civics.

 

Mike-

We had a very similar problem when we were tuning the Skyline- we tried to get more power in the midrange via more boost, but the engine almost started detonating immediately whatever we did there. This is on a motor designed for boost, and modified to accept high boost levels- something the stock F20C isn't designed to do... We ended up with full boost (1.6 bar) from 5000-8500 rpm, and boost building from 2500-5000 rpm. All in all, very driveable, and very smooth torque buildup.

I think it's the nature of the beast- turbo/ supercharged cars tuned more highly strung will get more power in the midrange, but also risk long term damage from ping. I think at higher rpms the fuel doesn't really get a chance to get heated before it's ignited by the spark.

-Nick


[This message has been edited by GTRPower (edited December 12, 2000).]

 

A few questions...

Jim, have you noticed much of a MPG change during normal driving and/or VTECing? Would like to hear what sort of range you're seeing with whatever type of driving.

Mike, if you don't mind me asking, how much would labor by Comptech be to install a SC in a S2000? Do you do that service or only develop the product? Please reply by email if you do not wish to post numbers to the board.

Cheers

 

[QUOTE]Originally posted by Ben:
[B]derryck,

I agree with what your saying, but read my earlier post to see why I dont think its a good idea.

 

once again....we will soon see an all alloy small block v8 with a doug nash or a zf gearbox....all your dreams come true,your every fantasy fulfilled....and probably not that expensive.....you just gotta eat some shit..as you attempt to pry your head out of the headrest!!!![worst part, you'll see it first in "street rodder-gack!]the answer is out there....don't make it so difficult!

[This message has been edited by dbw (edited December 12, 2000).]