2 seconds. Or you can put it into 4th immediately and then into 1st. This accomplishes the same thing - it stops the rotation of the tranny internals. 4th doesn't cause an audible clunk because of its gear ratio, which stops the rotation in a much more "cushioned" fashion.
No, double clutching won't do it as this continues to spin the tranny. No, heel/toe has absolutely nothing to do with this clunk nor is it absolutely necessary for a tranny with syncros. All heel/toe does is to facilitate the possibility of applying the brake aggressively while downshifting.
Somebody should put this into a sticky for all eternity so no more S2000 owners get too worked up about something that's purely a physical attribute of transmission function. Also sticky the definition of certain things like "heel/toe", double clutch, matching revs, etc. People seem to have very vague ideas of what these things are and they do and what they're for.

 

Well wouldn't riding each gear on the way down help slow the tranny as well?

 

Your original question had to do with putting it into 1st gear from a stop and getting that clunk. That clunk has nothing to do with downshifting and the dynamics of what goes on there. In fact downshifting through each gear will speed up some parts of the tranny. The parts that slow down when slowing down the car is the output side of the tranny and that has nothing to do with the input side of the tranny, which is affected by shifting. You are confusing one situation with the other. You should Google how a manual transmission works.

 

Oh okay, well thanks for the info!

 

Oh okay, well thanks for the info!
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whats the best thing to do to not get the clunk? i mean the s2000s didnt come factory doing that right???

 

Rob-2 told you what to do to NOT get the clunk and so have I. And yes, it DID come from the factory doing that. ALL manual transmissions do this. It's just that the S2000 has so little sound deadening that you can hear it while in other types of cars, you don't. Also, added to the mix is the fact that the gear ratios of the tranny are specific, the ratio of the rear diff is specific, the fact that there are CV buckets in the 1/2 shafts and propshaft and the specific type of syncros the car has that contribute to a fair amount of backlash in the drivetrain. These are all those little spaces between teeth of gears in tranny, in gears in the ring and pinion and the CV joints. When you suddenly stop the tranny by putting in gear from neutral to 1st, all that inertia is transferred from the spinning tranny to close up all those little spaces and you get the clunk.
I'm not carrying this on any further. This has been a natural occurrence in all S2000s since 1999 and explanations have been given ad nauseum. People really should learn how a drivetrain works (and learn to search).