S300 boost control w/ AEM Boost Solenoid

turbo R · Post by **turbo R** » Tue May 01, 2007 8:56 pm

i don't get the difference between fixed duty cycle and gear based duty cycle. i tried setting the duty cycle at random numbers ranging from 10 to 25 boost is not increasing past the normal 14 psi. i don't even know what numbers i am supposed to put in pressure vs. duty cycle. also, what effects does solenoid activation pressure have on this? thanks a lot for the help.

Post by **Spunkster** » Wed May 02, 2007 9:27 am

In Smanager, go to Help, and click on Contents. In the search tab type in "boost control parameters". Read the topic on boost control parameters and it will explain how it all works and s hould be set up.

turbo R · Post by **turbo R** » Wed May 02, 2007 5:37 pm

ok, i read it. i want to know what to set solenoid activation pressure to. i have a 14psi spring in the wg. also, are the values in the pressure vs duty cycle table arbitrary? i don't understand how it works. do i make a pass at the wastegate pressure first?? then another one with the duty cycle raised? then input the map sensor reading with it's corresponding duty cycle % ?

sorry for all the questions but this is my first time tuning and i just want to get it right.

thanks.

Post by **Spunkster** » Thu May 03, 2007 9:45 am

Solenoid activation pressure sets the point where ECU starts to use the solenoid to control boost pressure. Normally this can be set a little below the minimum boost pressure in order to minimize wear on the solenoid.

The Pressure vs Duty Cycle table contains a lookup of pressure values which correspond to a solenoid duty cycle. The values for this table must be set by using a fixed duty cycle and noting the resulting manifold pressure. Note that different ambient conditions will result in slightly different boost pressures for the same duty cycle.

high_octane · Post by **high_octane** » Thu May 10, 2007 4:31 pm

ok i am have the same iusse to but i am using the GM controler. I have my pressue is at 4.9 an duty is at 25.0. geting 10 psi at first gear. do i need to up the the pressue and duty?

Post by **Spunkster** » Thu May 10, 2007 5:05 pm

Have you used the fixed duty cycle to find what duty cycles produce specific boost pressures and kept track of them and entered them into the table?

oscarmayer · Post by **oscarmayer** » Mon May 21, 2007 3:43 pm

ok jsut double checking the aem soleniod is compatable with the S300 correct? and will handle up to 40psi? (i'm running a 7psi spring)