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Tip of the hat to you Mr Pacman,
Though I'm certainly not a turbo H22 fan,
This has to be one of the best executed, thought out & thorough turbo setups I've seen in a long while.
Nice.... very...

You're doing it wrong.
+5 is the piston dome capacity
Size is 81.00 (Std bore)
With given comp height on an unmachined B18C2, the compression would be 11.2:1
- Using OEM head gasket.
Take 0.005"...

http://cache.blippitt.com/wp-content/uploads/2011/03/Popcorn-02-Stephen-Colbert.gif

I would, as the ECU is a switching earth.
But you could cheat & run a wire from the fan switch - positive side to A12
Then the factory relay would be operational.
& if you spliced it, the fan...

No problem

Further to the Drift product there's also the Billion VFC's (& don't have an S300)
http://www.nengun.com/billion/vfc-max
http://www.nengun.com/billion/vfc-elm

Re using the Hondata
If you have a...

Check ignition switch
Check main relay
Check fuel pump relay
Check engine earth
Oh & make sure the back-up battery power to the FC is just that, not accessory power.

Stay away from pin stands,
They're dangerous & can collapse sideways.
If this happenes & you're under the car, you're dead.

BC spec 3's are their entry level cam.
Std type r, they're a drop in.(Std springs)
Dunno why they call them 3's though.

It'll work no problem,
Also your figures to compare are not quit right.
Your OEM figures are at 1mm lift & the BC figures are advertised.
The actual difference between the cams is not that great....

The HD is a standard clutch with heavier clamp laod,
The SO comes with an uprated disc as well as the heavier clasmp load for approx $15 more.
It's a better clutch in that it last longer & can take...

& every one of them was a turd...
Nuf said........

Use Bisimoto H22 V2 header.

Use a piece of gaffa tape.
Contact "Johnson & Johnson" for application data.
& stay off boost.

:p

How many pre-load springs did you use?
This could be the issue.

Oh & yes, type R to type S is no problem.

Actually at idle you're more likely to hydrolock than if you drop it back to 1st & floor it through a deep puddle.
The engine can injest shitloads of water at high rpm the reverse is true of low rpm...

9 time out of 10, the S300 delivers a better result. (Better cold start, idle, sharper, crisper & 2~3 hp more everywhere)
Though on one occasion I had an FC outpower an S200 on a DC2R
(But I...

Having pistons under crown cooling jets is considered to be an improvement over having none.
(B18C vs B18A/B20B - case in point)
Generally the only reason you might delete them is due to exessive...

Having tuned all of the ECU's mentioned, it seems to me a no brainer to move to a Haltech Platinum Pro system.
Yes, the M48 is good, but it can't do VTC.
Moving to an M400 will work, but good luck...

Maybe go somewhere that can do the job,
It's not rocket science.

Re 1-4 / 2-3
I have no idea what you're trying to say.

Like a broken record, lol...
I guess a quick test would be to swap headers.
If nothing happens, the ports are too big.

Get a 1ft length of 2.25" steam pipe & wack it in a vice.
Put the collector end over it & beat it back to shape with a wooden of teflon hammer.

Clean the yellow crap off with carby cleaner...
...

You need to find out.

How did you go?

Are the exhaust ports also heavily ported to go with the oversized ex valve?