looking for some answers-performance

[Lotusv8]

Been searching this board but I can't find some direct answer to my questions. Here r some of my questions:

Without turbocharging, can you get 25 hp in stock engine ?
I can't find anyone here or in other forum (unless I missed it) were able to attain 25hp.
If so, what are the modification to attain that extra power?

In turbocharging, do you need to lower the compression to boost 8psi ?
Anyone here turbocharged a stock engine? Does it last?

I have a project and I need some help.

Thanks a million

[wowowox]

I think you can , ppl say they can get 25HP+ by changing the computer or by changing the (header+cat+exhaust+intake).

[Java Junky]

From what I've seen (some drivin' experience with Stewie , other than regular maintenance n' changin' to winter hoops, no wrenchin') I think you'd be hard-pressed to get an additional 25 horse without resortin' to openin' up the engine or forced induction.
There's alodda stuff out there that you can spend money on, but if there's 10 horse available from add-ons I'd be very surprised.
There are some knowledgable members on the site that can better answer your forced-induction questions, so I'll leave that to them, but if you'll look through some of the previous posts on similar topics, you'll probably find the answers to your questions.
Good luck.

[Lotusv8]

Thanks: both....

I've been searching the net and I could not find anyone attained 25hp in aspirated form. I know I can get more than 25hp in turbocharging but way too dangerous having 11 compression. If I can get at least 25hp in aspirated, then I will not worry of fitting a turbo. Fitting a turbo is treaky. You need to lower the compression which either change the piston or use a thicker gasket. Putting a thicker gasket is just band aid fix and I am not too sure I would like to go to this route. My project is a Lotus Super 7 and would like to use the S2000 engine because its a rear drive. I have no problem deleting all the emission unit such as catalytic or other ancilliaries that deals with emission. I like to find some write up attaining 25hp by taking out the catalytic, buying upgrade ecu, headers or other traditional way. But seems tough to extract 25hp. Anyone ?

Thanks

[gomarlins3]

A computer change and I/H/E MIGHT get you close, but I don't think so.

As for turbocharging, you don't need to lower the compression. Many have done it with 8 lbs of boost without a different head gasket. You could supercharge it and not change a thing and still get an additional 110 HP.

[Lotusv8]

Originally Posted by gomarlins3

A computer change and I/H/E MIGHT get you close, but I don't think so.

As for turbocharging, you don't need to lower the compression. Many have done it with 8 lbs of boost without a different head gasket. You could supercharge it and not change a thing and still get an additional 110 HP.

You probably right, tough to get 25hp in aspirated or traditional hot rodding in the S2000. I think its possible a 15hp but the money is not worth for little gain. If you said, supercharge attained 110hp (additional), I assume approx. 8psi. I don't have room for supercharging unit. I saw some of the supercharger fitted to the S2000, they are installed in the front (could be vortech). If there is a supercharger that mount on the top (like some muscle car style) then I have room.
Now the alternatives is turbo. I have room for turbo but do you know how much power turbo develope comparable to 8psi of supercharger?

Here is my Lotus Super 7 currently powered by Turbocharged Susuki Hayabusa 990lbs 375hp@13,000 rpm!!
Not a reliable beast.

[Halo]

The centrifugal SC kits don't quite make 110 add'l whp. That statement, of course, is a bit loaded because absolute numbers are meaningless when it comes to wheel dynos. More accurately, what you can expect is a 35-45% whp GAIN from stock. Unlike absolute whp claims, that number holds up regardless of what kind of dyno and what conditions. They both go on the front of the engine where the stock airbox used to be. They make anywhere from 5-6psi (Comptech is a bit lower than Vortech) but the gains don't materialize until 5,000rpm+. Stock compression seems to be OK with this setup, but using the highest octane gas you can get is probably a good idea.

The roots type blowers that mount on top of V8 engines are fitted that way because the intake manifolds are in the center of the V. Since ours is off to one side of the block, a blower of this type would need to be on one side or the other. There was a thread at S2ki about the most recent attempt for a positive displacement SC application, and it looked like it might happen this time, but I stopped following it.

25 hp cannot be achieved with bolt-ons. Some will claim they did it, and yes, maybe on a cold day, on a dyno with an enormous fan blowing on an OPEN HOOD, they were able to pull it off when compared to a baseline on a hot day. But, real world, hood closed, on a hot track? No.

Let's face it, Honda built this engine about as well as it could be. To give you some idea, I run a Comptech SC/AC setup. After a while, I put a test pipe and Comptech exhaust on there and had no significant (1-2%)additional gain in whp. This means the stock exhaust is not limiting output, even with a SC (admittedly at a relatively conservative 5psi boost). Took that stuff off and went back to stock.

[Lotusv8]

"25 hp cannot be achieved with bolt-ons. Some will claim they did it, and yes, maybe on a cold day, on a dyno with an enormous fan blowing on an OPEN HOOD, they were able to pull it off when compared to a baseline on a hot day. But, real world, hood closed, on a hot track? No.

Let's face it, Honda built this engine about as well as it could be. To give you some idea, I run a Comptech SC/AC setup. After a while, I put a test pipe and Comptech exhaust on there and had no significant (1-2%)additional gain in whp. This means the stock exhaust is not limiting output, even with a SC (admittedly at a relatively conservative 5psi boost). Took that stuff off and went back to stock."

I think the Honda engine is so efficient and the power been put & designed by the engineers been utilized. There is nothing to extract unless you choose a forced induction route.
Well at the end of the day, are you happy with the Supercharged Comptech
setup? If you will do it over again, do you still think Supercharger is the answer over turbo? A kinda leaning toward turbo but without lowering the compression, there is a danger of blowing the engine.
This engine will go to my Seven (rear drive, very ideal setup).

[Halo]

I think the Comptech setup was perfect for me. I wanted something plug and play that had a reasonable amount reliability and it had to be CARB legal (no turbo kit is). I wanted a bit more power from the S, but I didn't want a headache, I'm just too busy to be troubleshooting the car all the time. I also wanted the install to be 100% reversible. (I guess if you count buying a new oilpan as part of the uninstall then the Vortech is too).

My S isn't a daily driver, and so far it's given me no problems since going SC. Stock clutch, stock brakes are holding up just fine. I also don't beat the crap out of it 100% of the time.

[gomarlins3]

[quote=Halo;10150]The centrifugal SC kits don't quite make 110 add'l whp. That statement, of course, is a bit loaded because absolute numbers are meaningless when it comes to wheel dynos. More accurately, what you can expect is a 35-45% whp GAIN from stock. [quote=Halo;10150]

Maybe, but I can only speak from my personal experience. With I/H/E I put down 200.8 WHP. After the CT SC w/AC, H/E, I out down 300.5 WHP.

[Scott]

Well, 25 peak hp doesn't mean much.

If you really want to make the engine more dynamic, run an ITB setup, AEM EMS, with a quality tune, and a better flowing ehxuast system. It should get you close to 25hp, but more importantly, you will have a significantly wider powerband to work with. And if that isn't enough, and you have the technical know-how, you could always get a stroker kit and bump up the displacement to 2.3 or so.