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some intresting things about SR motors
blacktops have pistons, rod, crank capable of makeing 400whp
s15 tranny is a 6 speed built into the housing of the old 5 speed. 5th and 6th gear can't handle more power than a stock s15 motor 250hp flywheel.
so its been said here, dont think your gonna put the baddest motor on what you think is the sexiest tranny ever.
also intresting is fully built SR's can be limited by the VTC. RED TOPs with VTC are great for mild streetable build ups cause the vtc will give you lots of low end torque with out sacrificing high RPM HP. However, cams with a 11mm lift wont work unless you disable the vtc. also VTC will fall apart at the very high RPM (around or bellow 10,000rpm).
the BLACK TOP head vs. RED TOP head
the black top is a high port head
the red top is a low port head or what an engineer would call a tunned port
all this really means is most black tops will never NEED a port and polish
nissan thought makeing huge ports in the head was less restriction therefore more power on turbo motors. however, later realized optimizing volumetric effiency, through a tunned head and VTC, made more useable power ON STOCK SR setups.
if you are set on being the baddest mother fucker. build a blacktop with the biggest cam and biggest turbo you can find. and of course all the stuff that goes with it.
wow, thats my first post
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