normality78 said:
Alvin bro,
mind to elaborate about the "properly done"? how only consider properly done? tks..
no... i totally do not mean what Polytron2 mentioned.
Err... what is 'properly done' ah... how to explain leh? Meaning u did everything correctly, and you have gotten everything that you'll be needing to run a reliable turbo kit.
Make sure the turbo's cooled properly (at least oil cooled, if can get it water as well then even better), your compression is not too high, your boost is stable, the fuel pump is pumping enuff fuel, fuel pressure high enuff, oil pressure high enuff, and MOST importantly tuning done to perfection! (not sure if i left out anything...)
There's no difference beween n/a and turbo valve seals... valve seals are designed to take pressure.... boost and vacuum are both exert pressure just in different directions.
As a matter of fact if u think of it, assuming u're boosting only 0.4 bar... make it known that n/a on idling exerts up to 0.7 bar of pressure (you'll see it as -0.7 bar on ur boost meter)... so if the valve seals are going to leak, its going to be more likely because of the vacuum rather than the boost.
The only difference the turbo is going to make to the valve seals is the higher wear and tear rate... because the valve seals will constantly go through big changes in pressure.
N/A and turbo cams... actually n/a cams are better... i know a lotta turbo try and get n/a cams to fit back into their turbo engines... coz' the lift is usually higher. I also did the same thing (you can measure yours to make sure).