AZER

I have a Year 2000 S2000 which is an Import and is always run on Shell Optimax

It has been fitted with:

A JP Custom Stainless Steel Dual Exit Exhaust

K&N Air Filter

Apexi VAFC2 (Told these add to the bhp)

How much bhp do you think it would be putting out???

GSi

237-240

AZER

How can it be less than 250bhp???

I was told all S2000 Imports are 250bhp when run on 98RON fuel, like Shell Optimax?

Saxo Boy

Then it will be around 250bhp

I have a UK S2000 with a single exit T1-R full decat exhaust, spoon snorkel and a K&N filter. The car should have around 240bhp out the box and depsite being faster than the standard car I still believe it has around 240bhp and that if I could be bothered a dyno would confirm that.

The reason for this is that increasing the peak bhp of the S2000 with n/a mods is not easy. My car probably still peaks at around 240bhp at 8300rpm however, it makes more power between 6000-8300rpm than the standard car and thus when I'm in vtec I'd pull on a standard car on the road. Ultimately this is what matters

I don't know for sure nor care how much power my car has. It regularly traps the quarter mile at over 101mph and with an ET below 14 second - I'm happy therefore

GSi

Japanese imports run at almost 250bhp in Japan on Japanese 100ron fuel.
EU imports I believe are the same as UK cars (but cheaper).

Optimax will be 98RON maximum and degrades over time so could be down to 96RON and the engine management will retard the performance accordingly, so you wouldn't be getting any more than a UK car (237bhp), because its running on UK fuel.

Exhaust might get you 2bhp. EDIT: actually just noticed its a dual exit, so probably won't get you anything. Single noisey bugger will get you some though.
Air filter won't get you anything by slightly crisper throttle response
VAFC depends on how its set up I guess, but I don't suppose it improves peak power much - just the midrange and cutover timing perhaps.

Just my opinion, others might have more insight, but the S2000 is very difficult to get major gains out of as has been talked about at length in the past.

eSeM

At the rear wheels?

Around 190bhp.

MB

None of those mods will give you any peak bhp gain.

Barely any gains elsewhere either im afraid. VAFC can adjust the fuelling, but not the ignition timing, so other than lowering the VTEC point I doubt it will do much.

If you want gains, then you will need a very good header, a very good ECU, a single exit pipe and a very good intake IMO.

MB

Nick Graves

BHP is merely dick-waving.

It's the area under the torque curve & it's the area where the S2000 can most benefit from sentitive tuning.

BHP gains at the top can be at the expense of torque where it's most needed.

Kobe

but the ignition retard would be not just octane related.. temperature?

and the extra power does not come from the octane but the compression difference.. so unless you got knocking why would the ignition be retarded?

I actually found my JDM runs better here in Europe with the colder climate and on optimax than it did in Japan on their premium fuel..

I suspect the 250 is an optimistic number..

GSi

Just regurgitating stuff I thought I heard and don't fully understand So my terminology may well be wrong, but I'm pretty sure that the concensus was that the JDM engine won't be able to produce the same power in the UK