12 PSI is way too low for wastegate spring pressure especially for running 21# peak. The flapper valve is lifting off its seat early, thus killing spoolup.

For 21# peak you should be running at least 14# of spring pressure, but 18# is probably ideal. This will greatly improve spoolup, transient response and midrange torque.

On a stock 16G with the stock actuator the base boost pressure from the factory can be between 10-12#. So, you are running the flapper valve way loose and it is lifting prematurely.

All of these bolton stock and aftermarket turbos have a threaded actuator rod and their WGA's are thus adjustable. You'll want to effectively shorten the actuator rod by rotating the turnbuckle on the end of the rod inward, clockwise about 4 full 360 degree rotations initially. This should get you in the ballpark. Then take her out for a test run in 4th gear and let us know what boost is reading still with the MBC turned out all the way to full soft.

If you need any help on the mechanics of doing this, don't hesitate to shoot me a PM.

 

Does rotating the acuator arm counter clockwise adjust the spring pressure or does it just help it hold tighter till it releases at 12psi......?

 

Bump for help...

 

My bad. I meant clockwise, not counterclockwise. Sorry.

Rotating the turnbuckle in clockwise will increase spring pressure. I don't know exactly how many PSI each 360* rotation equates to on that particular turbo though.

Start off with three complete 360* rotations. Then test the car WOT in 4th, or 5th while keeping an eye on the boost gauge. Remember to set the MBC all the way out counterclockwise to full soft(lowest boost setting possible).

 

If YOU own a tomei7960 How much boost are you running on what gas and when do you hit full boost?????"

 

First thing to do is to Adjust the wastegate actuator arm. To do this remove the heat sheilds and youll see a metal arm with a wire clip holding the arm to the valve. Unclip the little clip and rotate the end of the arm clockwise to add preload. You want the arm to be just ever so slightly shorter than where the clip goes, so that you have to pull on the arm just a tinny bit to get it to reach.

 

It was the wastegate....

 

probably having the famous boost spike\build issue with tomei 7960, go external. solves all problems. i was having a hell of a time trying to control my boost on internal gate also, just went external.

 

What exactly was it about the WG? I can't see the image that you posted.

 

What remote gate setup did you opt for?

 

Does the Tomei turbo run a proprietary WGA?

 

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Actuator arm loosened its self through the bushing. Fixed it with a small welded bead to keep it in place.

 

Hi dirtylilevo,

I hve the same tomei turbo. i would like to know if you had the same problem like me because it is drive me crazy! Tomei specs say the actuator is setting up for round 12 or 14 psi starting boost at 3000 or 3500 rmp. I m starting the boost quickly but hits 20 psi!! nd i can not go down! i can go down to 15 psi adjusting off the actuator but i lost a ot of spool! i get spool until the 4500 rmp with the actuator at 15 psi.
After you fixed your WG problem, did you able to controll your boost at 12 or 15 psi spooling at 3000 or 3500 rmp at least?
I appreciate your help on this and sorry for my bad english