sdminus,JohnA thanks for your comments.
at the time i built the manifold water injection wasnt in mind at all. i think the engine should have deceased long ago if there was a major cylinder distribution problem with airflow. i dont know alot about fluid dynamic's etc, so im probably way off here.. but surely a big step down from the throttle body to the plenum. would cause a low pressure point and along with the throttle aimed to the roof of the plemum, (probably gone a bit far with the angle) would cause more of a "filling" effect, rather than aiming the air down the runners. hence no angle on the plenum. from there letting the runners/bellmouths do all the work. that was the idea, but how well it works is another question. im sure with the correct angle on the roof of the plenum it would be an advantage. but the way i see it, is if the angle is wrong, say too steep would there not be more pressure over the latter runners? no angle seemed like the best option at the time.
heres a few more picures before the manifold was put together
http://img.photobucket.com/albums/v1...r/runners2.jpg
http://img.photobucket.com/albums/v1...r/Pic_0044.jpg
anyway
but as far as water goes, it seem it could be a bit of a lost cause. water being heavyer and keeping on its merry way to the end of the plenum and not just hanging about waiting to go in like the air.. the way the runners draw in from the side not down like most oem manifolds (on top of the other problems) surely cant be helping the cause either?
unsure on inlet temps, but are pretty low, out let side of intercooler never gets much past cold to touch inlet manifold doesnt get very warm either. i should test it i guess.
im unsure where to go next, a reliable port injection system is almost out of my price range. maybe a jet between bellmouths between cylinder 1&2 and another between 3&4 could work? probably still not so great..
sdminus: looks like you were lucky there, you were running meth wernt you? what are your plans now?