increasing throttle response? flywheel or throttle body?

[JohnL]

Yes I agree.5000 is a bit of overkill but your car will run better when the oil is changed.So $75 vs a lil better performance.Every car will be different here but certainly my car runs better.

75$? You're using fully synthetic aren't you? A good synthetic should last longer than a good mineral based oil, so IMO you're really throwing money away. If you're going to change the oil every 5000km you might as well use a good mineral oil.

What you seem to be doing might be reasonable insurance for a very high performance / stressed / high $ build engine, but not otherwise, really.

It certainly sounds like it! But I just changed mine,it would have been a bit more than 20k,maybe 30k... but it again made a significant difference! A noticeable difference.I was quite suprised.

Then I'll bet you got a dose (or doses) of dirty fuel somewhere / sometime before the changeover. I've changed a fuel filter that had at least 100,000km on it, and seen no performance change, not that I really expected there to be one since the filter had passed a flow test with flying colours (I just felt I should change it 'just in case' and that it was so old).

Be careful of placebo affects too. I'll swear that my car goes harder and even handles better after I've cleaned it...

Gotcha,Cheers! I will putting in 91 octane then! Or should I...I cant hear my car ping or anything but at 100km/h when cruising on the freeway is does little hesitates/surges/misfire (but not),it only does it on 91 octane fuel and only at 100-100km/h?

Use 91 if that's the fuel specified by Honda for your engine (and you haven't increased the CR or supercharged it). Without being able to make any categorical statement, I suspect your problem above to be either coincidental with some other problem, and / or maybe you have had some bad 91 octane fuel.

You should always try to buy fuel from a high turnover outlet as fuel that's been sitting in the servo's tanks too long can go stale and lose octane rating along with some of the properties that make it ignite readily in the combustion chamber...

Forsure forsure.Worth giving a shot though!

Advancing the ignition timing on speculation is potentially dangerous because you may get what is in effect pre-ignition, which can cause damage (the dyno will tell you what's what...). If you do this I suspect the ECU may well 'retard' the timing back to stock in any case, unless you advance the base timing so far it's beyond the ECUs parameters to correct...

Probably but it all adds up! Logically it makes sense,a cooler fuel going into the mix will be more compressed and therefore produce more power.

Many things (very many, and not just to do with cars...) seem to be 'common sense' or "logical", but in reality are incorrect assumptions. Cooler fuel may be very slightly denser, so the mixture may be very slightly richer with a cooler fuel, which may or may not be a good thing. Cooler fuel may very slightly lower the temperature of the inducted air, cooling it ever so slightly more as the fuel is injected resulting in a very slightly greater quantity of air being inducted, but at best it will be a miniscule difference...

I tried this when karting, i.e. chilling the fuel in an esky and using an insulated tank and lines on the kart. Never made a jot of difference as far as I could tell, and didn't show up on the stop watch either...