So i bought a new tial wastegate 38mm (one of the older bigger silver ones) and i hooked up the vacuum line to the side of the wastegate. I was on half throttle and noticed my boost going up to 14-16psi. I have a .5 bar spring and i opened up my wastegate and made sure it is a .5 bar. im wondering if it would work if i hook up the vacuum line to the top of the wastegate instead of the side because the first tial wastegate i bought, i believe the vacuum was attached to the top and i thought it was broken because it was opening up so i bought this new one, and now that the vacuum is on the side, its not opening up at all. any ideas?

 

The top is for a boost controller.

 

what is the side for? i heard the top is for a electronics boost controller while the other one is for a mbc

 

for electronic boost controllers u use both top n side..

 

if not then i just stick with using the top part?

 

NO unless u have a EBC u need to use side and only side!!!!!

 

hmmmmm...... my vacuum line is on the side... but its still boosting over 14lbs....

 

then you have a pinched, hole, loose vac line....or the diaphragm is damaged.

 

open wastgate remove spring...and pull up on the top hot that the diaphram is attached to...it should easily lift up along with the shaft of the valve...

oh and theres 4 set screws that hold that on the valve makes sure they are there n tight

 

well i just took the wastegate off, and for a .5 bar spring, that piston on the bottom is pretty tight to push.... it took two thumbs and a lot of pressure before that piston moved... i think ill open it up when i get home

 

even a 5psi spring takes some pressure..... its not exhuast flow that overcomes the spring pressure its boost.....boost pushes the diapram and collapses the spring

 

ill go home and take apart my wg and see whats wrong

 

what vac source were you using for your wastegate?