Okay I figured out why I was having overboost problems. When I installed my 10.5 hotside I had to pull on the WGA rod to fit it on the hotside and it never seated. I adjusted my wastegate actuator turnbuckle so that it could fit onto my 10.5 hotside. After I done this I made sure I was seeing WG pressure 11psi. Well after adjustments to my MBC (small incriments) I did some WOT pulls to adjust boost to the proper settings. i started boosting to 1.4 which is fine by me but I notice it takes me until 4th gear 5000 RPMS to reach full boost. I clearly dont remember what it is suppose to be but it seems like it is longer than before (to hit full boost) I was wondering is this normal? PLEASE HELP ME

 

It's not preloaded enough - I think you adjusted the turnbuckle too far. It's not supposed to reach the wastegate flapper pin - you have to apply compressed air to the WGA nipple to make the arm pop up, then you attach it to the pin. Otherwise, you have no preload. In 4th gear, you should shoot right to full boost no later than 3500rpm (probably earlier).

 

I did all the steps mention above and still it didnt work guys. I adjusted my turnbuckle all the way back down and Im still hitting boost late. Also on my boost gauge i can be at .5 bar and wont hear my spool until .9 bar then it trakes off. It feels like I have a big turbo alot of lag I just need help and info Thanks

 

bump

 

Sorry, no way to know. Sounds like a faulty installation or something is wrong with the MBC.

 

The MBC would cause me to hit boost late even if its turned all the way down. Shouldnt I see wastegate pressure.

 

Depends on the spring being used, but if it's set to min then yeah the max boost should be base wastegate pressure (11psi = .8 bar).

 

thats what i thought im trying to eliminaqte as much as possible. im thinking about a new wastegate actuator

 

has anybody had these same problems

 

ttt

 

no help

 

Because it's very abnormal. You're also bumping way too frequently.

 

ok cool. I did also notice antifreeze on my UICP, tranny and lines like it was splashing but i didnt see any leaks and its no where on the ground

 

That's also strange. Is your radiator cap all the way on? Multiple times, I've turned it to the end only to realize later I needed to press it down and make another quarter turn. It would spooge out coolant when I did this. Also, check to be sure your overflow bottle isn't filling up and "overflowing."

 

[quote=Warrtalon;3934875]Depends on the spring being used, but if it's set to min then yeah the max boost should be base wastegate pressure (11psi = .8 bar).[/quote.



Base wategate pressure is with the MBC set to full soft, and the length of the threaded acutator rod set to where the turnbuckle´s eye freely slides on and off the flapper valve´s arm. Once you´ve got got it set at base wategate pressure , then you have to SHORTEN the threaded actuator rod by turning the turnbuckle in toward the actuator.

Shorten the rod until the turnbuckle is 1/3 of an inch from where it mounts on the flapper valve arm( 1/3" of daylight between tip of turnbuckle and flapper valve´s arm). Now, pull the turnbuckle onto the flapper valve´s arm, using some strength. This 1/3 inch of tension on the actuator should give you about 15-18 psi of wastegate preload. This should get you into the ballpark.

From this rough ballpark setting you´ll probably have to raise or lower the preload to achieve the exact desired preload of between 17-19 psi, You make this final preload adjustment by either rotating the turnbuckle in or out in 1/2 turn increments. Until you achieve a WG preload of about 17-18 psi.

Up until now you haven´t touched the MBC which is still on its softest setting. Now however, that you´ve achieved the desired WG preload strictly by turning the turnbuckle on the actuator rod, now you can dial in the final couple of psi with the MBC. Good Luck.

Edit: The 1/3 inch of daylight, between tip of turnbuckle and flapper valve arm, is an approximate measurement, given a stock 16G Evo VIII turbo with a 10.5 HS. I did it this way with my Forge WGA, but I guess it´ll be about the same with the stock WGA.....I think