Alright, so the manual says leave it at 70% and adjust the spring on the WG. However, from the threads I am reading it seems like a lot of the guys on here are changing the duty cycles and getting good results.

Does everyone pretty much agree that it is ok to change the duty cycles. I am getting tired of playing with my wastegate. Should I change the duty or just back the screw all the way out and keep playing with it manually. Kinda defeats the idea of an electronic boost controller.

Thanks,
Josh

 

How are you adjusting the spring on the wastegate !? That's you usually tap into the manifold pressure, and run a line to the wastegate and then hook the celonoid (valve) up to the relief side of the wastegate, and controll how much pressure gets by, and with your setup you probhably need another vaccuum line for the sensor that the avcr reads....

Basically the spring should controll base pressure, without any kind of boost controll, and the controller overrides that, but can only do so much if the wastegate is too small, and the wastegate is 100% open, or if you want to lower your boost beyond what the spring is set at. You're SOL... Bigger wastegte or smaller spring, is the only solution, in between those extremes your boost controller does its job. There's also a theory floating around that the max pressure you want to run should be no greater than 2X or 2.5X the spring...

Spring Value = Min. Boost. This is something a bunch of people get confused.

 

ahhh, i see. i thought that was the way it worked, but the AVCR manual says to leave the duty cycle set at 70%. which i took to mean; set it at your desired boost, set the duty to 70%, and then play with the spring until it held boost where you want it.

didn't make sense to me, but you know how those japanese manuals are. it was a little 2 sentence bullet. that read something like "for external wastegates set duty to 70% and adjust wastegate for max boost," or something equally hard to understand. obviously, something was lost in translation.

 

I think what there trying to say in the manual there is put the correct spring in the wastegate so that you hit your max boost at 70% duty cycle. Like put the proper spring in so that if 20psi is your max your only running 70% duty cycle and not 80 or 90%.

But yes i do have an avcr and play with my duty cycles all the time at different rpms in order to get boost sooner and hold boost better.

 

that makes perfect sense. in other words you should have to go over a 70% duty cycle to hit target boost. if you do you need to change springs.

thanks, i was all kinds of confused.