CarbonYellowJ's

bc no exhaust is less restrictive than an open header. The myth that you need back pressure is just that.

CarbonYellowJ's

This may sound mundane but have you replaced your spark plugs lately and/or done a tune up? You would be surprised what that will do to your numbers. Having my plugs gapped wrong caused my s2000 with the Greddy turbo kit to make 150whp the fuel was quenching the plugs.

ans2k

what about valve adjustments?

9kFever

Eh?

Who tuned the car?

tsoshi2007

they replaced the colder plugs for me when they felt the number was low. but still the number didn't increase after the replacement

//steve\\

being an 04 its the 2.2 right? I would step up to a 70mm test pipe and exhaust. I think the 60mm single exhausts choke the engine a little bit. They seem to do better on the 2.0L engines. Also, like others have said peak numbers aren't necessarily what's most important and if that is what you care most about then I'd boost it. I know its frustrating to spend a ton and not see huge gains but that is what people have been saying all along about these cars. Honda really did their homework with this motor.

iDomN8U

Post up a Dyno sheet of the before and after

You altitude, climate, etc could have played a big part in the numbers.

The most important thing is not to compare peak values but look at your overall picture.

Try lining up with another s2k that made more/similar hp then you and see how it goes.

FYI: J's is a 63mm exhaust

CKit

Heat soak can cut your hp by 10-15%.

But like sjs0433 said, Honda didn't leave very much "engine" on the table without major headwork or boost.

camuman

tuning the stock NA motor doesn yield a whole lot. i have seen some make 225whp on a dynojet, but thats in cold weather. truthfully, ,NA s2k just doesnt make the hp you expect for the money you put in. mine NA made 212whp on aem tune in hot humid weather. then i SC it, and made 350 on 8psi.

even if your down on power from the tune, how much do you think you are really down? maybe 10whp across the board max?

do CR test and see if motor is weak.

Fastfour

Without knowing your numbers stock we are all just speculating. I made 201/145 on the same dyno w/ my stock 2007. I then put a velocity stack and K&N filter on my otherwise stock intake and got 205/148.

A year or so later I put Fujita intake, T1R header and a T1R 70mm Sparrow and only picked up around 8hp and a few tq I believe. I have sinced reflashed the ECU w/ the Hondata reflash.

These motors don't give up much NA. The best option for me was to reflash and pick up that 25 or so midrange where the car really needs it. I have not dynoed since the reflash but do plan to in the near future.

Crescent (C-Speed) is an accomplished tuner and good friend of mine. I doubt the problem is with your tune.