ok im having trouble figuring out what pulleys to use to go up on the boost .. i use to have a chart in a old BDS book i had but now i cant find it .. or on the internet anywhere ... help please does anyone know where i could locate one of these charts ?
Smaller top pulley and larger bottom! LOL Sorry, I had to do it. I wish that I could help, but that's all I've got.
from what i understand boost is dependent on the restriction in the intake track. if thats the case its not as simple of what pully makes so much boost. now i guess if you know that your current pullys make x amount of boost then there may be a way to predict how much of an increase each pully size will net. or i could be wrong and just babbeling away.
Nope, I think that you are correct Bryant. And when you say restriction in the intake tract (assuming you meant the size of the runners and plenum) you also have to take into account the valve timing as well. For instance a motor with a lot of overlap would leak a lot of the boost out the exhaust side since both valves would be open for a longer period of time than say the same motor with less overlap. A lot of things go into the actual boost number and I'm not positive that the number itself really tells you a lot. Ultimately efficiency comes into play and the final dyno numbers and where it makes the power/torque is much more important in my humble opinion.
there is a boost chart that shows you if you a certain tooth pully on the top and a certain tooth pully on the bottom you should have x pounds of boost ..... its just a easier why of figuring out the boost
there are to many factors involved to get a direct answer. unless bds has a way of calculating that number with exactly what parts your engine has
Gee, it says right at the top of the chart that boost will vary with different camshafts, exhaust systems, cylinder heads, ported heads, etc. I stand corrected, I must not have a clue. Hmmm...I wonder what my turbo makes if not boost? It must make kittens...
Oooo...I'm so overmatched here! Well let's see I'm an engineer...and on the weekendsI am part of the pit crew for a Nostalgia top fuel dragster. But I'm sure that wouldn't impress you any since we aren't pro's. The guy asked a question and we came back with answers. Maybe a pound or four makes no difference to you, but when you are talking a total of 25psi that adds up to almost 16% difference (assuming the worse case of 4psi off). You know what, go screw yourself. You seem to know everything and have an answer to it all so I will step aside and allow you to call us all clueless. Good luck in life.
