It's hard to say - but I would guess that would PART of why you arent seeing boost all the way to readline with a stock turbo, the nice thing though - when you get a new upgraded turbo, that porting will help the bigger turbo make its power all the way to redline https://www.nopistons.com/forums/pub...IR#>/smile.gif

which turbo do you think is best for response and the porting i have?

i was thinking of going the plug and play way, and wanted to upgrade to BNR3.

but it would make no sense if its not the perfect solution for the porting i have.



i am not up for dragracing, but circuit and highway (highspeed)

hey, after reading a post from Lynn, i think i got what you were up to tell me.

You meant, if the runner (i think i call them right.. (the "tube" from LIM to the intake Port) is incrased in volume, its like a bigger straw and slows down the velocity of mixture going threw it. am i right?



if i am right.. i have to tell you that my runners have got some porting, they have much more volume over stock!

could THIS be the reason for lower boost at high rpm?

That could be a factor - probably not the entire reason.



As for the turbo - a stock upgrade would be good. You should use at least a 60-1 compressor side on a large sp IMHO..

BTW - i think the BNR3 is a 60-1 - not sure though....

yea it is, and the BNR mod can be used up to 17psi as far as i know.