port your throttle body! thats what everyone forgets to do when building their engines, I went as far as slimming the buttefly down. and port matching beyond the standard gasket sizes helps too,
Are you sure you want to run 1.6bar with such a high compression ratio ?
if your running 23.6 PSI (1.6bar) of boost (at an altitude of 0 feet). and Your motor's static compression is 8.3 :1. at this boost level and altitude your effective compression ratio is 21.63 :1 ??!! seems a little high but when you compare it to a a static ratio of 7.3:1 there does not seem to be that much difference in there 19.02 :1 for a stock ratio of 7.3:1
although I would be able to run 1.9 bar (28psi) and still have the same effective compression on boost as you if you was running 1.6bar
around 21:1!!?? So I guess its down to how much stress you want to put on the engine.
both figures seem really high ! as petrol N/A cars run anywhere from 10:1 - 14:1 . I guess this is why so many lads break rods, melt pistons or fry the rings pushing silly boost on stock internals. NOTE: a stock C/R of 8.3:1 with standard boost comes out at around 14.5:1
If your running 1bar this jumps up to around 16:1
Hope this helps you work out what gasket to get, I went for the TRD just to be safe and give options for the future.
@david "that doesnt seem right to me weisco say compression ratio with their 10cc dished pistons is 7.8:1 with a standard gasket so a .6 one would bump it up a bit "
weisco would have to know your CC volume , pistons to deck height ETC. im sure there information all comes from OEM numbers and figures just with the -10cc added for the pistons. as soon as you deck the block and skim the head youve lost around .5mm from both surfaces !
Hope this helps you work out what gasket to get, I went for the TRD just to be safe and give options for the future.
and remember, have fun..